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[PATCH 8/9] Define multi-minmax oclasses for types without distance
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* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index fd85c18d83..c77c207e94 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 8135854163..5cf820f04b 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2186,6 +2237,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2562,6 +2630,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3007,6 +3092,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3024,6 +3126,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


--------------22A4B241170149838D4D1F8F
Content-Type: text/x-patch; charset=UTF-8;
 name="0009-Ignore-correlation-for-new-BRIN-opclasses-20210215.patch"
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment;
 filename*0="0009-Ignore-correlation-for-new-BRIN-opclasses-20210215.patc";
 filename*1="h"



^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 90d17e5008..02aa618b49 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 762ac3acef..4ab4aff073 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2210,6 +2261,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2592,6 +2660,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3061,6 +3146,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3078,6 +3180,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


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^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 08d0d55b06..d11ec73c81 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 8135854163..5cf820f04b 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2186,6 +2237,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2562,6 +2630,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3007,6 +3092,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3024,6 +3126,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


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 name="0007-Remove-the-special-batch-mode-use-a-larger--20210211.patch"
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^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index fd85c18d83..c77c207e94 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 8135854163..5cf820f04b 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2186,6 +2237,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2562,6 +2630,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3007,6 +3092,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3024,6 +3126,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


--------------22A4B241170149838D4D1F8F
Content-Type: text/x-patch; charset=UTF-8;
 name="0009-Ignore-correlation-for-new-BRIN-opclasses-20210215.patch"
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment;
 filename*0="0009-Ignore-correlation-for-new-BRIN-opclasses-20210215.patc";
 filename*1="h"



^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 90d17e5008..02aa618b49 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 762ac3acef..4ab4aff073 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2210,6 +2261,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2592,6 +2660,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3061,6 +3146,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3078,6 +3180,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


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^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 08d0d55b06..d11ec73c81 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 8135854163..5cf820f04b 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2186,6 +2237,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2562,6 +2630,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3007,6 +3092,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3024,6 +3126,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


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 name="0007-Remove-the-special-batch-mode-use-a-larger--20210211.patch"
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 filename*1="tch"



^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index fd85c18d83..c77c207e94 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 8135854163..5cf820f04b 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2186,6 +2237,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2562,6 +2630,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3007,6 +3092,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3024,6 +3126,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


--------------22A4B241170149838D4D1F8F
Content-Type: text/x-patch; charset=UTF-8;
 name="0009-Ignore-correlation-for-new-BRIN-opclasses-20210215.patch"
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment;
 filename*0="0009-Ignore-correlation-for-new-BRIN-opclasses-20210215.patc";
 filename*1="h"



^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 90d17e5008..02aa618b49 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 762ac3acef..4ab4aff073 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2210,6 +2261,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2592,6 +2660,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3061,6 +3146,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3078,6 +3180,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


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^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 08d0d55b06..d11ec73c81 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 8135854163..5cf820f04b 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2186,6 +2237,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2562,6 +2630,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3007,6 +3092,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3024,6 +3126,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


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 name="0007-Remove-the-special-batch-mode-use-a-larger--20210211.patch"
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^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index fd85c18d83..c77c207e94 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 8135854163..5cf820f04b 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2186,6 +2237,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2562,6 +2630,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3007,6 +3092,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3024,6 +3126,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


--------------22A4B241170149838D4D1F8F
Content-Type: text/x-patch; charset=UTF-8;
 name="0009-Ignore-correlation-for-new-BRIN-opclasses-20210215.patch"
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment;
 filename*0="0009-Ignore-correlation-for-new-BRIN-opclasses-20210215.patc";
 filename*1="h"



^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 90d17e5008..02aa618b49 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 762ac3acef..4ab4aff073 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2210,6 +2261,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2592,6 +2660,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3061,6 +3146,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3078,6 +3180,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


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^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 08d0d55b06..d11ec73c81 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 8135854163..5cf820f04b 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2186,6 +2237,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2562,6 +2630,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3007,6 +3092,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3024,6 +3126,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


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^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index fd85c18d83..c77c207e94 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 8135854163..5cf820f04b 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2186,6 +2237,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2562,6 +2630,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3007,6 +3092,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3024,6 +3126,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


--------------22A4B241170149838D4D1F8F
Content-Type: text/x-patch; charset=UTF-8;
 name="0009-Ignore-correlation-for-new-BRIN-opclasses-20210215.patch"
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment;
 filename*0="0009-Ignore-correlation-for-new-BRIN-opclasses-20210215.patc";
 filename*1="h"



^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 90d17e5008..02aa618b49 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 762ac3acef..4ab4aff073 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2210,6 +2261,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2592,6 +2660,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3061,6 +3146,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3078,6 +3180,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


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^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 08d0d55b06..d11ec73c81 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 8135854163..5cf820f04b 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2186,6 +2237,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2562,6 +2630,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3007,6 +3092,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3024,6 +3126,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


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^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index fd85c18d83..c77c207e94 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 8135854163..5cf820f04b 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2186,6 +2237,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2562,6 +2630,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3007,6 +3092,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3024,6 +3126,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


--------------22A4B241170149838D4D1F8F
Content-Type: text/x-patch; charset=UTF-8;
 name="0009-Ignore-correlation-for-new-BRIN-opclasses-20210215.patch"
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment;
 filename*0="0009-Ignore-correlation-for-new-BRIN-opclasses-20210215.patc";
 filename*1="h"



^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 90d17e5008..02aa618b49 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 762ac3acef..4ab4aff073 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2210,6 +2261,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2592,6 +2660,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3061,6 +3146,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3078,6 +3180,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


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^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 08d0d55b06..d11ec73c81 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 8135854163..5cf820f04b 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2186,6 +2237,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2562,6 +2630,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3007,6 +3092,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3024,6 +3126,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


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^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index fd85c18d83..c77c207e94 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 8135854163..5cf820f04b 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2186,6 +2237,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2562,6 +2630,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3007,6 +3092,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3024,6 +3126,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


--------------22A4B241170149838D4D1F8F
Content-Type: text/x-patch; charset=UTF-8;
 name="0009-Ignore-correlation-for-new-BRIN-opclasses-20210215.patch"
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment;
 filename*0="0009-Ignore-correlation-for-new-BRIN-opclasses-20210215.patc";
 filename*1="h"



^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 90d17e5008..02aa618b49 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 762ac3acef..4ab4aff073 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2210,6 +2261,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2592,6 +2660,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3061,6 +3146,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3078,6 +3180,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


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^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 08d0d55b06..d11ec73c81 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 8135854163..5cf820f04b 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2186,6 +2237,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2562,6 +2630,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3007,6 +3092,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3024,6 +3126,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


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 name="0007-Remove-the-special-batch-mode-use-a-larger--20210211.patch"
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 filename*1="tch"



^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index fd85c18d83..c77c207e94 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 8135854163..5cf820f04b 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2186,6 +2237,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2562,6 +2630,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3007,6 +3092,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3024,6 +3126,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


--------------22A4B241170149838D4D1F8F
Content-Type: text/x-patch; charset=UTF-8;
 name="0009-Ignore-correlation-for-new-BRIN-opclasses-20210215.patch"
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment;
 filename*0="0009-Ignore-correlation-for-new-BRIN-opclasses-20210215.patc";
 filename*1="h"



^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 90d17e5008..02aa618b49 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 762ac3acef..4ab4aff073 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2210,6 +2261,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2592,6 +2660,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3061,6 +3146,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3078,6 +3180,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


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^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 08d0d55b06..d11ec73c81 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 8135854163..5cf820f04b 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2186,6 +2237,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2562,6 +2630,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3007,6 +3092,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3024,6 +3126,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


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 name="0007-Remove-the-special-batch-mode-use-a-larger--20210211.patch"
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^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index fd85c18d83..c77c207e94 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 8135854163..5cf820f04b 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2186,6 +2237,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2562,6 +2630,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3007,6 +3092,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3024,6 +3126,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


--------------22A4B241170149838D4D1F8F
Content-Type: text/x-patch; charset=UTF-8;
 name="0009-Ignore-correlation-for-new-BRIN-opclasses-20210215.patch"
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment;
 filename*0="0009-Ignore-correlation-for-new-BRIN-opclasses-20210215.patc";
 filename*1="h"



^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 90d17e5008..02aa618b49 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 762ac3acef..4ab4aff073 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2210,6 +2261,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2592,6 +2660,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3061,6 +3146,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3078,6 +3180,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


--------------4B194FF8F3EA3786FF9EAE1F
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 filename*1="tch"



^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 08d0d55b06..d11ec73c81 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 8135854163..5cf820f04b 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2186,6 +2237,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2562,6 +2630,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3007,6 +3092,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3024,6 +3126,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


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^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index fd85c18d83..c77c207e94 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 8135854163..5cf820f04b 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2186,6 +2237,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2562,6 +2630,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3007,6 +3092,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3024,6 +3126,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


--------------22A4B241170149838D4D1F8F
Content-Type: text/x-patch; charset=UTF-8;
 name="0009-Ignore-correlation-for-new-BRIN-opclasses-20210215.patch"
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment;
 filename*0="0009-Ignore-correlation-for-new-BRIN-opclasses-20210215.patc";
 filename*1="h"



^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 90d17e5008..02aa618b49 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 762ac3acef..4ab4aff073 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2210,6 +2261,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2592,6 +2660,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3061,6 +3146,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3078,6 +3180,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


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^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 08d0d55b06..d11ec73c81 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 8135854163..5cf820f04b 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2186,6 +2237,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2562,6 +2630,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3007,6 +3092,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3024,6 +3126,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


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 name="0007-Remove-the-special-batch-mode-use-a-larger--20210211.patch"
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^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index fd85c18d83..c77c207e94 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 8135854163..5cf820f04b 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2186,6 +2237,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2562,6 +2630,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3007,6 +3092,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3024,6 +3126,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


--------------22A4B241170149838D4D1F8F
Content-Type: text/x-patch; charset=UTF-8;
 name="0009-Ignore-correlation-for-new-BRIN-opclasses-20210215.patch"
Content-Transfer-Encoding: 7bit
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 filename*0="0009-Ignore-correlation-for-new-BRIN-opclasses-20210215.patc";
 filename*1="h"



^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 90d17e5008..02aa618b49 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 762ac3acef..4ab4aff073 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2210,6 +2261,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2592,6 +2660,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3061,6 +3146,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3078,6 +3180,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


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^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 08d0d55b06..d11ec73c81 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 8135854163..5cf820f04b 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2186,6 +2237,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2562,6 +2630,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3007,6 +3092,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3024,6 +3126,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


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^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index fd85c18d83..c77c207e94 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 8135854163..5cf820f04b 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2186,6 +2237,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2562,6 +2630,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3007,6 +3092,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3024,6 +3126,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


--------------22A4B241170149838D4D1F8F
Content-Type: text/x-patch; charset=UTF-8;
 name="0009-Ignore-correlation-for-new-BRIN-opclasses-20210215.patch"
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment;
 filename*0="0009-Ignore-correlation-for-new-BRIN-opclasses-20210215.patc";
 filename*1="h"



^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 90d17e5008..02aa618b49 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 762ac3acef..4ab4aff073 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2210,6 +2261,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2592,6 +2660,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3061,6 +3146,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3078,6 +3180,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


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^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 08d0d55b06..d11ec73c81 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 8135854163..5cf820f04b 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2186,6 +2237,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2562,6 +2630,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3007,6 +3092,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3024,6 +3126,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


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^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index fd85c18d83..c77c207e94 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 8135854163..5cf820f04b 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2186,6 +2237,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2562,6 +2630,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3007,6 +3092,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3024,6 +3126,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


--------------22A4B241170149838D4D1F8F
Content-Type: text/x-patch; charset=UTF-8;
 name="0009-Ignore-correlation-for-new-BRIN-opclasses-20210215.patch"
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment;
 filename*0="0009-Ignore-correlation-for-new-BRIN-opclasses-20210215.patc";
 filename*1="h"



^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 90d17e5008..02aa618b49 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 762ac3acef..4ab4aff073 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2210,6 +2261,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2592,6 +2660,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3061,6 +3146,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3078,6 +3180,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


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^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 08d0d55b06..d11ec73c81 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 8135854163..5cf820f04b 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2186,6 +2237,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2562,6 +2630,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3007,6 +3092,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3024,6 +3126,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


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 name="0007-Remove-the-special-batch-mode-use-a-larger--20210211.patch"
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Content-Disposition: attachment;
 filename*0="0007-Remove-the-special-batch-mode-use-a-larger--20210211.pa";
 filename*1="tch"



^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index fd85c18d83..c77c207e94 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 8135854163..5cf820f04b 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2186,6 +2237,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2562,6 +2630,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3007,6 +3092,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3024,6 +3126,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


--------------22A4B241170149838D4D1F8F
Content-Type: text/x-patch; charset=UTF-8;
 name="0009-Ignore-correlation-for-new-BRIN-opclasses-20210215.patch"
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment;
 filename*0="0009-Ignore-correlation-for-new-BRIN-opclasses-20210215.patc";
 filename*1="h"



^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 90d17e5008..02aa618b49 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 762ac3acef..4ab4aff073 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2210,6 +2261,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2592,6 +2660,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3061,6 +3146,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3078,6 +3180,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


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^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 08d0d55b06..d11ec73c81 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 8135854163..5cf820f04b 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2186,6 +2237,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2562,6 +2630,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3007,6 +3092,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3024,6 +3126,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


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Content-Type: text/x-patch; charset=UTF-8;
 name="0007-Remove-the-special-batch-mode-use-a-larger--20210211.patch"
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 filename*1="tch"



^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index fd85c18d83..c77c207e94 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 8135854163..5cf820f04b 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2186,6 +2237,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2562,6 +2630,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3007,6 +3092,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3024,6 +3126,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


--------------22A4B241170149838D4D1F8F
Content-Type: text/x-patch; charset=UTF-8;
 name="0009-Ignore-correlation-for-new-BRIN-opclasses-20210215.patch"
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment;
 filename*0="0009-Ignore-correlation-for-new-BRIN-opclasses-20210215.patc";
 filename*1="h"



^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 90d17e5008..02aa618b49 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 762ac3acef..4ab4aff073 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2210,6 +2261,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2592,6 +2660,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3061,6 +3146,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3078,6 +3180,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


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^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 08d0d55b06..d11ec73c81 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 8135854163..5cf820f04b 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2186,6 +2237,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2562,6 +2630,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3007,6 +3092,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3024,6 +3126,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


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^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index fd85c18d83..c77c207e94 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 8135854163..5cf820f04b 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2186,6 +2237,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2562,6 +2630,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3007,6 +3092,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3024,6 +3126,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


--------------22A4B241170149838D4D1F8F
Content-Type: text/x-patch; charset=UTF-8;
 name="0009-Ignore-correlation-for-new-BRIN-opclasses-20210215.patch"
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment;
 filename*0="0009-Ignore-correlation-for-new-BRIN-opclasses-20210215.patc";
 filename*1="h"



^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 90d17e5008..02aa618b49 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 762ac3acef..4ab4aff073 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2210,6 +2261,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2592,6 +2660,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3061,6 +3146,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3078,6 +3180,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


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^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 08d0d55b06..d11ec73c81 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 8135854163..5cf820f04b 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2186,6 +2237,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2562,6 +2630,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3007,6 +3092,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3024,6 +3126,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


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 name="0007-Remove-the-special-batch-mode-use-a-larger--20210211.patch"
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^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index fd85c18d83..c77c207e94 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 8135854163..5cf820f04b 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2186,6 +2237,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2562,6 +2630,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3007,6 +3092,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3024,6 +3126,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


--------------22A4B241170149838D4D1F8F
Content-Type: text/x-patch; charset=UTF-8;
 name="0009-Ignore-correlation-for-new-BRIN-opclasses-20210215.patch"
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment;
 filename*0="0009-Ignore-correlation-for-new-BRIN-opclasses-20210215.patc";
 filename*1="h"



^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 90d17e5008..02aa618b49 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 762ac3acef..4ab4aff073 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2210,6 +2261,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2592,6 +2660,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3061,6 +3146,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3078,6 +3180,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


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^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 08d0d55b06..d11ec73c81 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 8135854163..5cf820f04b 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2186,6 +2237,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2562,6 +2630,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3007,6 +3092,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3024,6 +3126,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


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^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index fd85c18d83..c77c207e94 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 8135854163..5cf820f04b 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2186,6 +2237,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2562,6 +2630,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3007,6 +3092,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3024,6 +3126,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


--------------22A4B241170149838D4D1F8F
Content-Type: text/x-patch; charset=UTF-8;
 name="0009-Ignore-correlation-for-new-BRIN-opclasses-20210215.patch"
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment;
 filename*0="0009-Ignore-correlation-for-new-BRIN-opclasses-20210215.patc";
 filename*1="h"



^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 90d17e5008..02aa618b49 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 762ac3acef..4ab4aff073 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2210,6 +2261,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2592,6 +2660,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3061,6 +3146,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3078,6 +3180,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


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^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 08d0d55b06..d11ec73c81 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 8135854163..5cf820f04b 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2186,6 +2237,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2562,6 +2630,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3007,6 +3092,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3024,6 +3126,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


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^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index fd85c18d83..c77c207e94 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 8135854163..5cf820f04b 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2186,6 +2237,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2562,6 +2630,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3007,6 +3092,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3024,6 +3126,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


--------------22A4B241170149838D4D1F8F
Content-Type: text/x-patch; charset=UTF-8;
 name="0009-Ignore-correlation-for-new-BRIN-opclasses-20210215.patch"
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment;
 filename*0="0009-Ignore-correlation-for-new-BRIN-opclasses-20210215.patc";
 filename*1="h"



^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 90d17e5008..02aa618b49 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 762ac3acef..4ab4aff073 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2210,6 +2261,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2592,6 +2660,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3061,6 +3146,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3078,6 +3180,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


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^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 08d0d55b06..d11ec73c81 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 8135854163..5cf820f04b 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2186,6 +2237,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2562,6 +2630,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3007,6 +3092,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3024,6 +3126,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


--------------0E72B707603BED22B4040825
Content-Type: text/x-patch; charset=UTF-8;
 name="0007-Remove-the-special-batch-mode-use-a-larger--20210211.patch"
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment;
 filename*0="0007-Remove-the-special-batch-mode-use-a-larger--20210211.pa";
 filename*1="tch"



^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index fd85c18d83..c77c207e94 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 8135854163..5cf820f04b 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2186,6 +2237,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2562,6 +2630,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3007,6 +3092,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3024,6 +3126,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


--------------22A4B241170149838D4D1F8F
Content-Type: text/x-patch; charset=UTF-8;
 name="0009-Ignore-correlation-for-new-BRIN-opclasses-20210215.patch"
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment;
 filename*0="0009-Ignore-correlation-for-new-BRIN-opclasses-20210215.patc";
 filename*1="h"



^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 90d17e5008..02aa618b49 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 762ac3acef..4ab4aff073 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2210,6 +2261,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2592,6 +2660,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3061,6 +3146,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3078,6 +3180,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


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^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 08d0d55b06..d11ec73c81 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 8135854163..5cf820f04b 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2186,6 +2237,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2562,6 +2630,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3007,6 +3092,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3024,6 +3126,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


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 name="0007-Remove-the-special-batch-mode-use-a-larger--20210211.patch"
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 filename*1="tch"



^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index fd85c18d83..c77c207e94 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 8135854163..5cf820f04b 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2186,6 +2237,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2562,6 +2630,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3007,6 +3092,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3024,6 +3126,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


--------------22A4B241170149838D4D1F8F
Content-Type: text/x-patch; charset=UTF-8;
 name="0009-Ignore-correlation-for-new-BRIN-opclasses-20210215.patch"
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment;
 filename*0="0009-Ignore-correlation-for-new-BRIN-opclasses-20210215.patc";
 filename*1="h"



^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 90d17e5008..02aa618b49 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 762ac3acef..4ab4aff073 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2210,6 +2261,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2592,6 +2660,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3061,6 +3146,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3078,6 +3180,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


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^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 08d0d55b06..d11ec73c81 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 8135854163..5cf820f04b 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2186,6 +2237,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2562,6 +2630,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3007,6 +3092,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3024,6 +3126,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


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 name="0007-Remove-the-special-batch-mode-use-a-larger--20210211.patch"
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^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index fd85c18d83..c77c207e94 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 8135854163..5cf820f04b 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2186,6 +2237,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2562,6 +2630,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3007,6 +3092,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3024,6 +3126,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


--------------22A4B241170149838D4D1F8F
Content-Type: text/x-patch; charset=UTF-8;
 name="0009-Ignore-correlation-for-new-BRIN-opclasses-20210215.patch"
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment;
 filename*0="0009-Ignore-correlation-for-new-BRIN-opclasses-20210215.patc";
 filename*1="h"



^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 90d17e5008..02aa618b49 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 762ac3acef..4ab4aff073 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2210,6 +2261,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2592,6 +2660,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3061,6 +3146,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3078,6 +3180,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


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^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* [PATCH 8/9] Define multi-minmax oclasses for types without distance
@ 2021-02-03 18:12  Tomas Vondra <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Tomas Vondra @ 2021-02-03 18:12 UTC (permalink / raw)

The existing multi-minmax opclasses rely on "distance" function when
deciding how to build the ranges, covering all the values. In principle,
those opclasses try to minimize the lengths of ranges, i.e. maximize the
lengths of "gaps" between them.

For some data types it's hard to construct a distance function - types
like "text" or "name" generally serve as labels, and may have ordering
only. So this uses a different approach, based on the observation that
it's the outliers that "break" BRIN minmax indexes, i.e. the lowest and
highest values. So simply sort the values, keep the (K-2) extreme values
on either tail, and build a single range representing the values in the
middle. Of course, the question is whether this is actually useful, but
that's hard to judge, and it's the best we can do.
---
 src/backend/access/brin/brin_minmax_multi.c |  75 ++++++++++++
 src/include/catalog/pg_amop.dat             | 119 ++++++++++++++++++++
 src/include/catalog/pg_amproc.dat           | 113 +++++++++++++++++++
 src/include/catalog/pg_opclass.dat          |  21 ++++
 src/include/catalog/pg_opfamily.dat         |  14 +++
 5 files changed, 342 insertions(+)

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 08d0d55b06..d11ec73c81 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -1210,6 +1210,9 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
 
 	Assert(ncranges >= 2);
 
+	if (!distanceFn)
+		return NULL;
+
 	distances = (DistanceValue *) palloc0(sizeof(DistanceValue) * (ncranges - 1));
 
 	/*
@@ -1298,6 +1301,70 @@ count_values(CombineRange *cranges, int ncranges)
 }
 #endif
 
+
+static int
+reduce_combine_ranges_simple(CombineRange *cranges, int ncranges,
+							 int max_values, FmgrInfo *cmp, Oid colloid)
+{
+	int		i;
+	int		nvalues;
+	Datum  *values;
+
+	compare_context cxt;
+
+	/* number of values to keep on each tail */
+	int tail = (max_values - 2) / 2;
+	int m = Min(tail / 2, ncranges - 1 / 2);
+
+	/* allocate space for the boundary values */
+	nvalues = 0;
+	values = (Datum *) palloc(sizeof(Datum) * max_values);
+
+	for (i = 0; i < m; i++)
+	{
+		/* head */
+		values[nvalues++] = cranges[i].minval;
+		values[nvalues++] = cranges[i].maxval;
+
+		/* tail */
+		values[nvalues++] = cranges[ncranges - 1 - i].minval;
+		values[nvalues++] = cranges[ncranges - 1 - i].maxval;
+	}
+
+	/* middle part */
+	values[nvalues++] = cranges[m].maxval;
+	values[nvalues++] = cranges[ncranges - 1 - m].minval;
+
+	/* We should have even number of range values. */
+	Assert(nvalues % 2 == 0);
+
+	/* sort the values */
+	cxt.colloid = colloid;
+	cxt.cmpFn = cmp;
+
+	/*
+	 * Sort the values using the comparator function, and form ranges
+	 * from the sorted result.
+	 */
+	qsort_arg(values, nvalues, sizeof(Datum),
+			  compare_values, (void *) &cxt);
+
+	/* We have nvalues boundary values, which means nvalues/2 ranges. */
+	for (i = 0; i < (nvalues / 2); i++)
+	{
+		cranges[i].minval = values[2*i];
+		cranges[i].maxval = values[2*i + 1];
+
+		/* if the boundary values are the same, it's a collapsed range */
+		cranges[i].collapsed = (compare_values(&values[2*i],
+											   &values[2*i+1],
+											   &cxt) == 0);
+	}
+
+	return (nvalues / 2);
+}
+
+
 /*
  * reduce_combine_ranges
  *		reduce the ranges until the number of values is low enough
@@ -1366,6 +1433,14 @@ reduce_combine_ranges(CombineRange *cranges, int ncranges,
 	if (keep >= ndistances)
 		return ncranges;
 
+	/*
+	 * Without distances, we use a simple approach keeping as many
+	 * outliers as possible.
+	 */
+	if (!distances)
+		return reduce_combine_ranges_simple(cranges, ncranges, max_values,
+											cmp, colloid);
+
 	/* sort the values */
 	cxt.colloid = colloid;
 	cxt.cmpFn = cmp;
diff --git a/src/include/catalog/pg_amop.dat b/src/include/catalog/pg_amop.dat
index 8135854163..5cf820f04b 100644
--- a/src/include/catalog/pg_amop.dat
+++ b/src/include/catalog/pg_amop.dat
@@ -1814,6 +1814,23 @@
   amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
   amopmethod => 'brin' },
 
+# minmax multi bytea
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '1', amopopr => '<(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '2', amopopr => '<=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '3', amopopr => '=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '4', amopopr => '>=(bytea,bytea)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bytea_minmax_multi_ops', amoplefttype => 'bytea',
+  amoprighttype => 'bytea', amopstrategy => '5', amopopr => '>(bytea,bytea)',
+  amopmethod => 'brin' },
+
 # bloom bytea
 { amopfamily => 'brin/bytea_bloom_ops', amoplefttype => 'bytea',
   amoprighttype => 'bytea', amopstrategy => '1', amopopr => '=(bytea,bytea)',
@@ -1836,6 +1853,23 @@
   amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
   amopmethod => 'brin' },
 
+# minmax multi "char"
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '1', amopopr => '<(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '2', amopopr => '<=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '3', amopopr => '=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '4', amopopr => '>=(char,char)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/char_minmax_multi_ops', amoplefttype => 'char',
+  amoprighttype => 'char', amopstrategy => '5', amopopr => '>(char,char)',
+  amopmethod => 'brin' },
+
 # bloom "char"
 { amopfamily => 'brin/char_bloom_ops', amoplefttype => 'char',
   amoprighttype => 'char', amopstrategy => '1', amopopr => '=(char,char)',
@@ -1858,6 +1892,23 @@
   amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
   amopmethod => 'brin' },
 
+# minmax multi name
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '1', amopopr => '<(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '2', amopopr => '<=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '3', amopopr => '=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '4', amopopr => '>=(name,name)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/name_minmax_multi_ops', amoplefttype => 'name',
+  amoprighttype => 'name', amopstrategy => '5', amopopr => '>(name,name)',
+  amopmethod => 'brin' },
+
 # bloom name
 { amopfamily => 'brin/name_bloom_ops', amoplefttype => 'name',
   amoprighttype => 'name', amopstrategy => '1', amopopr => '=(name,name)',
@@ -2186,6 +2237,23 @@
   amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
   amopmethod => 'brin' },
 
+# minmax multi text
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '1', amopopr => '<(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '2', amopopr => '<=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '3', amopopr => '=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '4', amopopr => '>=(text,text)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/text_minmax_multi_ops', amoplefttype => 'text',
+  amoprighttype => 'text', amopstrategy => '5', amopopr => '>(text,text)',
+  amopmethod => 'brin' },
+
 # bloom text
 { amopfamily => 'brin/text_bloom_ops', amoplefttype => 'text',
   amoprighttype => 'text', amopstrategy => '1', amopopr => '=(text,text)',
@@ -2562,6 +2630,23 @@
   amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
   amopmethod => 'brin' },
 
+# minmax multi character
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '<(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '2',
+  amopopr => '<=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '3', amopopr => '=(bpchar,bpchar)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '4',
+  amopopr => '>=(bpchar,bpchar)', amopmethod => 'brin' },
+{ amopfamily => 'brin/bpchar_minmax_multi_ops', amoplefttype => 'bpchar',
+  amoprighttype => 'bpchar', amopstrategy => '5', amopopr => '>(bpchar,bpchar)',
+  amopmethod => 'brin' },
+
 # bloom character
 { amopfamily => 'brin/bpchar_bloom_ops', amoplefttype => 'bpchar',
   amoprighttype => 'bpchar', amopstrategy => '1', amopopr => '=(bpchar,bpchar)',
@@ -3007,6 +3092,23 @@
   amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
   amopmethod => 'brin' },
 
+# minmax multi bit
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '1', amopopr => '<(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '2', amopopr => '<=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '3', amopopr => '=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '4', amopopr => '>=(bit,bit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/bit_minmax_multi_ops', amoplefttype => 'bit',
+  amoprighttype => 'bit', amopstrategy => '5', amopopr => '>(bit,bit)',
+  amopmethod => 'brin' },
+
 # minmax bit varying
 { amopfamily => 'brin/varbit_minmax_ops', amoplefttype => 'varbit',
   amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
@@ -3024,6 +3126,23 @@
   amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
   amopmethod => 'brin' },
 
+# minmax multi bit varying
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '1', amopopr => '<(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '2',
+  amopopr => '<=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '3', amopopr => '=(varbit,varbit)',
+  amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '4',
+  amopopr => '>=(varbit,varbit)', amopmethod => 'brin' },
+{ amopfamily => 'brin/varbit_minmax_multi_ops', amoplefttype => 'varbit',
+  amoprighttype => 'varbit', amopstrategy => '5', amopopr => '>(varbit,varbit)',
+  amopmethod => 'brin' },
+
 # minmax numeric
 { amopfamily => 'brin/numeric_minmax_ops', amoplefttype => 'numeric',
   amoprighttype => 'numeric', amopstrategy => '1',
diff --git a/src/include/catalog/pg_amproc.dat b/src/include/catalog/pg_amproc.dat
index 51403716b1..69a7ed682c 100644
--- a/src/include/catalog/pg_amproc.dat
+++ b/src/include/catalog/pg_amproc.dat
@@ -805,6 +805,22 @@
 { amprocfamily => 'brin/bytea_minmax_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bytea
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bytea_minmax_multi_ops', amproclefttype => 'bytea',
+  amprocrighttype => 'bytea', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom bytea
 { amprocfamily => 'brin/bytea_bloom_ops', amproclefttype => 'bytea',
   amprocrighttype => 'bytea', amprocnum => '1',
@@ -836,6 +852,22 @@
 { amprocfamily => 'brin/char_minmax_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi "char"
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/char_minmax_multi_ops', amproclefttype => 'char',
+  amprocrighttype => 'char', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom "char"
 { amprocfamily => 'brin/char_bloom_ops', amproclefttype => 'char',
   amprocrighttype => 'char', amprocnum => '1',
@@ -867,6 +899,22 @@
 { amprocfamily => 'brin/name_minmax_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi name
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/name_minmax_multi_ops', amproclefttype => 'name',
+  amprocrighttype => 'name', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom name
 { amprocfamily => 'brin/name_bloom_ops', amproclefttype => 'name',
   amprocrighttype => 'name', amprocnum => '1',
@@ -1197,6 +1245,22 @@
 { amprocfamily => 'brin/text_minmax_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi text
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/text_minmax_multi_ops', amproclefttype => 'text',
+  amprocrighttype => 'text', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom text
 { amprocfamily => 'brin/text_bloom_ops', amproclefttype => 'text',
   amprocrighttype => 'text', amprocnum => '1',
@@ -1663,6 +1727,23 @@
   amprocrighttype => 'bpchar', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi character
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bpchar_minmax_multi_ops', amproclefttype => 'bpchar',
+  amprocrighttype => 'bpchar', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # bloom character
 { amprocfamily => 'brin/bpchar_bloom_ops', amproclefttype => 'bpchar',
   amprocrighttype => 'bpchar', amprocnum => '1',
@@ -2180,6 +2261,21 @@
 { amprocfamily => 'brin/bit_minmax_ops', amproclefttype => 'bit',
   amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_union' },
 
+# minmax multi bit
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '1', amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '4', amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/bit_minmax_multi_ops', amproclefttype => 'bit',
+  amprocrighttype => 'bit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax bit varying
 { amprocfamily => 'brin/varbit_minmax_ops', amproclefttype => 'varbit',
   amprocrighttype => 'varbit', amprocnum => '1',
@@ -2194,6 +2290,23 @@
   amprocrighttype => 'varbit', amprocnum => '4',
   amproc => 'brin_minmax_union' },
 
+# minmax multi bit varying
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '1',
+  amproc => 'brin_minmax_multi_opcinfo' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '2',
+  amproc => 'brin_minmax_multi_add_value' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '3',
+  amproc => 'brin_minmax_multi_consistent' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '4',
+  amproc => 'brin_minmax_multi_union' },
+{ amprocfamily => 'brin/varbit_minmax_multi_ops', amproclefttype => 'varbit',
+  amprocrighttype => 'varbit', amprocnum => '5',
+  amproc => 'brin_minmax_multi_options' },
+
 # minmax numeric
 { amprocfamily => 'brin/numeric_minmax_ops', amproclefttype => 'numeric',
   amprocrighttype => 'numeric', amprocnum => '1',
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat
index da25befefe..823f1b01fe 100644
--- a/src/include/catalog/pg_opclass.dat
+++ b/src/include/catalog/pg_opclass.dat
@@ -266,18 +266,27 @@
 { opcmethod => 'brin', opcname => 'bytea_minmax_ops',
   opcfamily => 'brin/bytea_minmax_ops', opcintype => 'bytea',
   opckeytype => 'bytea' },
+{ opcmethod => 'brin', opcname => 'bytea_minmax_multi_ops',
+  opcfamily => 'brin/bytea_minmax_multi_ops', opcintype => 'bytea',
+  opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bytea_bloom_ops',
   opcfamily => 'brin/bytea_bloom_ops', opcintype => 'bytea',
   opckeytype => 'bytea', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_minmax_ops',
   opcfamily => 'brin/char_minmax_ops', opcintype => 'char',
   opckeytype => 'char' },
+{ opcmethod => 'brin', opcname => 'char_minmax_multi_ops',
+  opcfamily => 'brin/char_minmax_multi_ops', opcintype => 'char',
+  opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'char_bloom_ops',
   opcfamily => 'brin/char_bloom_ops', opcintype => 'char',
   opckeytype => 'char', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_minmax_ops',
   opcfamily => 'brin/name_minmax_ops', opcintype => 'name',
   opckeytype => 'name' },
+{ opcmethod => 'brin', opcname => 'name_minmax_multi_ops',
+  opcfamily => 'brin/name_minmax_multi_ops', opcintype => 'name',
+  opckeytype => 'name', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'name_bloom_ops',
   opcfamily => 'brin/name_bloom_ops', opcintype => 'name',
   opckeytype => 'name', opcdefault => 'f' },
@@ -311,6 +320,9 @@
 { opcmethod => 'brin', opcname => 'text_minmax_ops',
   opcfamily => 'brin/text_minmax_ops', opcintype => 'text',
   opckeytype => 'text' },
+{ opcmethod => 'brin', opcname => 'text_minmax_multi_ops',
+  opcfamily => 'brin/text_minmax_multi_ops', opcintype => 'text',
+  opckeytype => 'text', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'text_bloom_ops',
   opcfamily => 'brin/text_bloom_ops', opcintype => 'text',
   opckeytype => 'text', opcdefault => 'f' },
@@ -381,6 +393,9 @@
 { opcmethod => 'brin', opcname => 'bpchar_minmax_ops',
   opcfamily => 'brin/bpchar_minmax_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar' },
+{ opcmethod => 'brin', opcname => 'bpchar_minmax_multi_ops',
+  opcfamily => 'brin/bpchar_minmax_multi_ops', opcintype => 'bpchar',
+  opckeytype => 'bpchar', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bpchar_bloom_ops',
   opcfamily => 'brin/bpchar_bloom_ops', opcintype => 'bpchar',
   opckeytype => 'bpchar', opcdefault => 'f' },
@@ -440,9 +455,15 @@
   opckeytype => 'timetz', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'bit_minmax_ops',
   opcfamily => 'brin/bit_minmax_ops', opcintype => 'bit', opckeytype => 'bit' },
+{ opcmethod => 'brin', opcname => 'bit_minmax_multi_ops',
+  opcfamily => 'brin/bit_minmax_multi_ops', opcintype => 'bit',
+  opckeytype => 'bit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'varbit_minmax_ops',
   opcfamily => 'brin/varbit_minmax_ops', opcintype => 'varbit',
   opckeytype => 'varbit' },
+{ opcmethod => 'brin', opcname => 'varbit_minmax_multi_ops',
+  opcfamily => 'brin/varbit_minmax_multi_ops', opcintype => 'varbit',
+  opckeytype => 'varbit', opcdefault => 'f' },
 { opcmethod => 'brin', opcname => 'numeric_minmax_ops',
   opcfamily => 'brin/numeric_minmax_ops', opcintype => 'numeric',
   opckeytype => 'numeric' },
diff --git a/src/include/catalog/pg_opfamily.dat b/src/include/catalog/pg_opfamily.dat
index ba9231ac8c..ffb20e72ab 100644
--- a/src/include/catalog/pg_opfamily.dat
+++ b/src/include/catalog/pg_opfamily.dat
@@ -192,6 +192,8 @@
   opfmethod => 'brin', opfname => 'numeric_minmax_multi_ops' },
 { oid => '4056',
   opfmethod => 'brin', opfname => 'text_minmax_ops' },
+{ oid => '9967',
+  opfmethod => 'brin', opfname => 'text_minmax_multi_ops' },
 { oid => '9902',
   opfmethod => 'brin', opfname => 'text_bloom_ops' },
 { oid => '9903',
@@ -210,14 +212,20 @@
   opfmethod => 'brin', opfname => 'datetime_bloom_ops' },
 { oid => '4062',
   opfmethod => 'brin', opfname => 'char_minmax_ops' },
+{ oid => '9968',
+  opfmethod => 'brin', opfname => 'char_minmax_multi_ops' },
 { oid => '9906',
   opfmethod => 'brin', opfname => 'char_bloom_ops' },
 { oid => '4064',
   opfmethod => 'brin', opfname => 'bytea_minmax_ops' },
+{ oid => '9969',
+  opfmethod => 'brin', opfname => 'bytea_minmax_multi_ops' },
 { oid => '9907',
   opfmethod => 'brin', opfname => 'bytea_bloom_ops' },
 { oid => '4065',
   opfmethod => 'brin', opfname => 'name_minmax_ops' },
+{ oid => '9970',
+  opfmethod => 'brin', opfname => 'name_minmax_multi_ops' },
 { oid => '9908',
   opfmethod => 'brin', opfname => 'name_bloom_ops' },
 { oid => '4068',
@@ -260,6 +268,8 @@
   opfmethod => 'brin', opfname => 'network_bloom_ops' },
 { oid => '4076',
   opfmethod => 'brin', opfname => 'bpchar_minmax_ops' },
+{ oid => '9971',
+  opfmethod => 'brin', opfname => 'bpchar_minmax_multi_ops' },
 { oid => '9915',
   opfmethod => 'brin', opfname => 'bpchar_bloom_ops' },
 { oid => '4077',
@@ -276,8 +286,12 @@
   opfmethod => 'brin', opfname => 'interval_bloom_ops' },
 { oid => '4079',
   opfmethod => 'brin', opfname => 'bit_minmax_ops' },
+{ oid => '9972',
+  opfmethod => 'brin', opfname => 'bit_minmax_multi_ops' },
 { oid => '4080',
   opfmethod => 'brin', opfname => 'varbit_minmax_ops' },
+{ oid => '9973',
+  opfmethod => 'brin', opfname => 'varbit_minmax_multi_ops' },
 { oid => '4081',
   opfmethod => 'brin', opfname => 'uuid_minmax_ops' },
 { oid => '9938',
-- 
2.26.2


--------------0E72B707603BED22B4040825
Content-Type: text/x-patch; charset=UTF-8;
 name="0007-Remove-the-special-batch-mode-use-a-larger--20210211.patch"
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment;
 filename*0="0007-Remove-the-special-batch-mode-use-a-larger--20210211.pa";
 filename*1="tch"



^ permalink  raw  reply  [nested|flat] 67+ messages in thread

* Re: Import Statistics in postgres_fdw before resorting to sampling.
@ 2026-01-04 02:56  Corey Huinker <[email protected]>
  0 siblings, 0 replies; 67+ messages in thread

From: Corey Huinker @ 2026-01-04 02:56 UTC (permalink / raw)
  To: Etsuro Fujita <[email protected]>; +Cc: Michael Paquier <[email protected]>; Ashutosh Bapat <[email protected]>; pgsql-hackers; [email protected]; [email protected]

>
>
> This version of the patch wouldn't fall back to the normal ANALYZE
> processing anymore, so this documentation should be updated as such.
> Also, as I think it's the user's responsibility to ensure the existing
> statistics are up-to-date, as I said before, I think we should add a
> note about that here.  Also, as some users wouldn't be able to ensure
> it, I'm wondering if the default should be false.
>

I agree, if there is no fallback, then the default should be false. When I
was initially brainstorming this patch, Nathan Bossart had suggested making
it the default because 1) that would be an automatic benefit to users and
2) the cost for attempting to import stats was small in comparison to a
table stample, so it was worth the attempt. I still want users to get that
automatic benefit, but if there is no fallback to sampling then the default
only makes sense as false.


> If the user wasn't able to ensure the statistics are up-to-date, I
> think he/she might want to do remote ANALYZE *before* fetching the
> statistics, not after trying to do so.  So I think we could instead
> provide this option as such.  What do you think about that?  Anyway,
> I'd vote for leaving this for another patch, as I think it's a
> nice-to-have option rather than a must-have one, as I said before.
>

I hadn't thought of that one. I think it has some merit, but I think we'd
want the try-after case as well. So the settings would be: "off" (never
remote analyze, default), "on" (always analyze before fetching), and
"retry" (analyze if no stats were found). This feature feeds into the same
thinking that the default setting did, which was to make this feature just
do what is usually the smart thing, and do it automatically. Building it in
pieces might be easier to get committed, but it takes away the dream of
seamless automatic improvement, and establishes defaults that can't be
changed in future versions. That dream was probably unrealistic, but I
wanted to try.


>
> ISTM that the code is well organized overall.  Here are a few comments:
>

Thanks!


>
> We don't use relallvisible and relallfrozen for foreign tables (note
> that do_analyze_rel() calls vac_update_relstats() with relallvisible=0
> and relallfrozen=0 for them).  Do we really need to retrieve (and
> restore) them?
>

No, and as you stated, we wouldn't want to. The query was lifted verbatim
from pg_dump, with a vague hope of moving the queries to a common library
that both pg_dump and postgres_fdw could draw upon. But that no longer
makes sense, so I'll fix.


> +static const char *attstats_query_17 =
> +   "SELECT DISTINCT ON (s.attname) attname, s.null_frac, s.avg_width, "
> +   "s.n_distinct, s.most_common_vals, s.most_common_freqs, "
> +   "s.histogram_bounds, s.correlation, s.most_common_elems, "
> +   "s.most_common_elem_freqs, s.elem_count_histogram, "
> +   "s.range_length_histogram, s.range_empty_frac,
> s.range_bounds_histogram "
> +   "FROM pg_catalog.pg_stats AS s "
> +   "WHERE s.schemaname = $1 AND s.tablename = $2 "
> +   "ORDER BY s.attname, s.inherited DESC";
>
> I think we should retrieve the attribute statistics for only the
> referenced columns of the remote table, not all the columns of it, to
> reduce the data transfer and the cost of matching local/remote
> attributes in import_fetched_statistics().
>

I thought about this, and decided that we wanted to 1) avoid per-column
round trips and 2) keep the remote queries simple. It's not such a big deal
to add "AND s.attname = ANY($3)" and construct a '{att1,att2,"ATt3"}'
string, as we already do in pg_dump in a few places.


>
> In fetch_remote_statistics()
>
> +   if (server_version_num >= 180000)
> +       relation_sql = relstats_query_18;
> +   else if (server_version_num >= 140000)
> +       relation_sql = relstats_query_14;
> +   else
> +       relation_sql = relstats_query_default;
>
> I think that having the definition for each of relstats_query_18,
> relstats_query_14 and relstats_query_default makes the code redundant
> and the maintenance hard.  To avoid that, how about building the
> relation_sql query dynamically as done for the query to fetch all
> table data from the remote server in postgresImportForeignSchema().
> Same for the attribute_sql query.
>

It may be a moot point. If we're not fetching relallfrozen, then the 14 &
18 cases are now the same, and since the pre-14 case concerns
differentiating between analyzed and unanalyzed tables, we would just map
that to 0 IF we kept those stats, but we almost never would because an
unanalyzed remote table would not have the attribute stats necessary to
qualify as a good remote fetch. So we're down to just one static query.


>
> That's all I have for now.  I will continue to review the changes.
>

Much appreciated.


^ permalink  raw  reply  [nested|flat] 67+ messages in thread


end of thread, other threads:[~2026-01-04 02:56 UTC | newest]

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2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
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2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2021-02-03 18:12 [PATCH 8/9] Define multi-minmax oclasses for types without distance Tomas Vondra <[email protected]>
2026-01-04 02:56 Re: Import Statistics in postgres_fdw before resorting to sampling. Corey Huinker <[email protected]>

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