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help / color / mirror / Atom feed[PATCH 8/8] batch build
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* [PATCH 8/8] batch build
@ 2021-01-22 00:11 Tomas Vondra <[email protected]>
0 siblings, 0 replies; 29+ messages in thread
From: Tomas Vondra @ 2021-01-22 00:11 UTC (permalink / raw)
---
src/backend/access/brin/brin_minmax_multi.c | 204 ++++++++++++++++++--
src/backend/access/brin/brin_tuple.c | 1 +
src/include/access/brin_tuple.h | 2 +-
3 files changed, 186 insertions(+), 21 deletions(-)
diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 094ecd2be9..72cca6f26b 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -57,6 +57,7 @@
#include "access/brin.h"
#include "access/brin_internal.h"
#include "access/brin_tuple.h"
+#include "access/hash.h" /* XXX strange that it fails because of BRIN_AM_OID without this */
#include "access/reloptions.h"
#include "access/stratnum.h"
#include "access/htup_details.h"
@@ -150,12 +151,23 @@ typedef struct MinMaxOptions
typedef struct Ranges
{
Oid typid;
+ Oid colloid;
+ AttrNumber attno;
/* (2*nranges + nvalues) <= maxvalues */
int nranges; /* number of ranges in the array (stored) */
int nvalues; /* number of values in the data array (all) */
int maxvalues; /* maximum number of values (reloption) */
+ /*
+ * Batch mode means we're simply appending values into new range,
+ * without any expensive steps (sorting, deduplication, ...). The
+ * buffer is sized to be much larger, but we keep the actual target
+ * size so that when serializing values we can do the right thing.
+ */
+ bool batch_mode;
+ int target_maxvalues;
+
/* values stored for this range - either raw values, or ranges */
Datum values[FLEXIBLE_ARRAY_MEMBER];
} Ranges;
@@ -375,6 +387,7 @@ range_deserialize(SerializedRanges *serialized)
range->nvalues = serialized->nvalues;
range->maxvalues = serialized->maxvalues;
range->typid = serialized->typid;
+ range->batch_mode = false;
typbyval = get_typbyval(serialized->typid);
typlen = get_typlen(serialized->typid);
@@ -844,11 +857,14 @@ fill_combine_ranges(CombineRange *cranges, int ncranges, Ranges *ranges)
/*
* Sort combine ranges using qsort (with BTLessStrategyNumber function).
*/
-static void
+static int
sort_combine_ranges(FmgrInfo *cmp, Oid colloid,
- CombineRange *cranges, int ncranges)
+ CombineRange *cranges, int ncranges,
+ bool deduplicate)
{
- compare_context cxt;
+ int n;
+ int i;
+ compare_context cxt;
/* sort the values */
cxt.colloid = colloid;
@@ -856,6 +872,24 @@ sort_combine_ranges(FmgrInfo *cmp, Oid colloid,
qsort_arg(cranges, ncranges, sizeof(CombineRange),
compare_combine_ranges, (void *) &cxt);
+
+ if (!deduplicate)
+ return ncranges;
+
+ /* optionally deduplicate the ranges */
+ n = 1;
+ for (i = 1; i < ncranges; i++)
+ {
+ if (compare_combine_ranges(&cranges[i-1], &cranges[i], (void *) &cxt))
+ {
+ if (i != n)
+ memcpy(&cranges[n], &cranges[i], sizeof(CombineRange));
+
+ n++;
+ }
+ }
+
+ return n;
}
/*
@@ -1026,26 +1060,40 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
*/
static CombineRange *
build_combine_ranges(FmgrInfo *cmp, Oid colloid, Ranges *ranges,
- Datum newvalue, int *nranges)
+ bool addvalue, Datum newvalue, int *nranges,
+ bool deduplicate)
{
int ncranges;
CombineRange *cranges;
/* now do the actual merge sort */
- ncranges = ranges->nranges + ranges->nvalues + 1;
+ ncranges = ranges->nranges + ranges->nvalues;
+
+ /* should we add an extra value? */
+ if (addvalue)
+ ncranges += 1;
+
cranges = (CombineRange *) palloc0(ncranges * sizeof(CombineRange));
- *nranges = ncranges;
/* put the new value at the beginning */
- cranges[0].minval = newvalue;
- cranges[0].maxval = newvalue;
- cranges[0].collapsed = true;
+ if (addvalue)
+ {
+ cranges[0].minval = newvalue;
+ cranges[0].maxval = newvalue;
+ cranges[0].collapsed = true;
- /* then the regular and collapsed ranges */
- fill_combine_ranges(&cranges[1], ncranges-1, ranges);
+ /* then the regular and collapsed ranges */
+ fill_combine_ranges(&cranges[1], ncranges-1, ranges);
+ }
+ else
+ fill_combine_ranges(cranges, ncranges, ranges);
/* and sort the ranges */
- sort_combine_ranges(cmp, colloid, cranges, ncranges);
+ ncranges = sort_combine_ranges(cmp, colloid, cranges, ncranges,
+ deduplicate);
+
+ /* remember how many cranges we built */
+ *nranges = ncranges;
return cranges;
}
@@ -1074,6 +1122,7 @@ count_values(CombineRange *cranges, int ncranges)
}
#endif
+
/*
* reduce_combine_ranges
* reduce the ranges until the number of values is low enough
@@ -1250,6 +1299,25 @@ range_add_value(BrinDesc *bdesc, Oid colloid,
Assert(2*ranges->nranges + ranges->nvalues <= ranges->maxvalues);
+ Assert((ranges->nranges >= 0) && (ranges->nvalues >= 0) && (ranges->maxvalues >= 0));
+
+ /*
+ * When batch-building, there should be no ranges. So either the
+ * number of ranges is 0 or we're not in batching mode.
+ */
+ Assert(!ranges->batch_mode || (ranges->nranges == 0));
+
+ /* When batch-building, just add it and we're done. */
+ if (ranges->batch_mode)
+ {
+ /* there has to be free space, if we've sized the struct */
+ Assert(ranges->nvalues < ranges->maxvalues);
+
+ ranges->values[ranges->nvalues++] = newval;
+
+ return true;
+ }
+
/*
* Bail out if the value already is covered by the range.
*
@@ -1322,7 +1390,9 @@ range_add_value(BrinDesc *bdesc, Oid colloid,
ranges->nvalues);
/* OK build the combine ranges */
- cranges = build_combine_ranges(cmpFn, colloid, ranges, newval, &ncranges);
+ cranges = build_combine_ranges(cmpFn, colloid, ranges,
+ true, newval, &ncranges,
+ false);
/* Reduce the ranges if needed */
if (ncranges > ranges->maxvalues)
@@ -1382,6 +1452,81 @@ range_add_value(BrinDesc *bdesc, Oid colloid,
return true;
}
+/*
+ * Generate range representation of data collected during "batch mode".
+ * This is similar to reduce_combine_ranges, except that we can't assume
+ * the values are sorted and there may be duplicate values.
+ */
+static void
+compactify_ranges(BrinDesc *bdesc, Ranges *ranges, int max_values)
+{
+ FmgrInfo *cmpFn,
+ *distanceFn;
+
+ /* combine ranges */
+ CombineRange *cranges;
+ int ncranges;
+ DistanceValue *distances;
+
+ MemoryContext ctx;
+ MemoryContext oldctx;
+
+ /*
+ * This should only be used in batch mode, and there should be no
+ * ranges, just individual values.
+ */
+ Assert((ranges->batch_mode) && (ranges->nranges == 0));
+
+ /* we'll certainly need the comparator, so just look it up now */
+ cmpFn = minmax_multi_get_strategy_procinfo(bdesc, ranges->attno, ranges->typid,
+ BTLessStrategyNumber);
+
+ /* and we'll also need the 'distance' procedure */
+ distanceFn = minmax_multi_get_procinfo(bdesc, ranges->attno, PROCNUM_DISTANCE);
+
+ /*
+ * The distanceFn calls (which may internally call e.g. numeric_le) may
+ * allocate quite a bit of memory, and we must not leak it. Otherwise
+ * we'd have problems e.g. when building indexes. So we create a local
+ * memory context and make sure we free the memory before leaving this
+ * function (not after every call).
+ */
+ ctx = AllocSetContextCreate(CurrentMemoryContext,
+ "minmax-multi context",
+ ALLOCSET_DEFAULT_SIZES);
+
+ oldctx = MemoryContextSwitchTo(ctx);
+
+ /* OK build the combine ranges */
+ cranges = build_combine_ranges(cmpFn, ranges->colloid, ranges,
+ false, (Datum) 0, &ncranges,
+ true); /* deduplicate */
+
+ /* build array of gap distances and sort them in ascending order */
+ distances = build_distances(distanceFn, ranges->colloid, cranges, ncranges);
+
+ /*
+ * Combine ranges until we get below max_values. We don't use any scale
+ * factor, because this is used at the very end of "batch mode" and we
+ * don't expect more tuples to be inserted soon.
+ */
+ ncranges = reduce_combine_ranges(cranges, ncranges, distances,
+ max_values, cmpFn, ranges->colloid);
+
+ Assert(count_values(cranges, ncranges) <= max_values);
+
+ /* decompose the combine ranges into regular ranges and single values */
+ store_combine_ranges(ranges, cranges, ncranges);
+
+ MemoryContextSwitchTo(oldctx);
+ MemoryContextDelete(ctx);
+
+ /* Check the ordering invariants are not violated (for both parts). */
+ AssertArrayOrder(cmpFn, ranges->colloid, ranges->values, ranges->nranges*2);
+ AssertArrayOrder(cmpFn, ranges->colloid, &ranges->values[ranges->nranges*2],
+ ranges->nvalues);
+}
+
Datum
brin_minmax_multi_opcinfo(PG_FUNCTION_ARGS)
{
@@ -1799,10 +1944,16 @@ brin_minmax_multi_distance_inet(PG_FUNCTION_ARGS)
}
static void
-brin_minmax_multi_serialize(Datum src, Datum *dst)
+brin_minmax_multi_serialize(BrinDesc *bdesc, Datum src, Datum *dst)
{
Ranges *ranges = (Ranges *) DatumGetPointer(src);
- SerializedRanges *s = range_serialize(ranges);
+ SerializedRanges *s;
+
+ /* In batch mode, we need to compress the accumulated values. */
+ if (ranges->batch_mode)
+ compactify_ranges(bdesc, ranges, ranges->target_maxvalues);
+
+ s = range_serialize(ranges);
dst[0] = PointerGetDatum(s);
}
@@ -1845,15 +1996,28 @@ brin_minmax_multi_add_value(PG_FUNCTION_ARGS)
/*
* If this is the first non-null value, we need to initialize the range
* list. Otherwise just extract the existing range list from BrinValues.
+ *
+ * When starting with an empty range, we assume this is a batch mode,
+ * i.e. we size the buffer for the maximum possible number of items in
+ * the range (based on range size and max number of items on a page).
+ *
+ * XXX This may require quite a bit of memory, so maybe we should use
+ * some value in between. OTOH most tables will have much wider rows,
+ * so the number of rows per page is much lower.
*/
if (column->bv_allnulls)
{
MemoryContext oldctx;
- oldctx = MemoryContextSwitchTo(column->bv_context);
+ BlockNumber pagesPerRange = BrinGetPagesPerRange(bdesc->bd_index);
- ranges = minmax_multi_init(brin_minmax_multi_get_values(bdesc, opts));
+ oldctx = MemoryContextSwitchTo(column->bv_context);
+ ranges = minmax_multi_init(MaxHeapTuplesPerPage * pagesPerRange);
+ ranges->attno = attno;
+ ranges->colloid = colloid;
ranges->typid = attr->atttypid;
+ ranges->batch_mode = true;
+ ranges->target_maxvalues = brin_minmax_multi_get_values(bdesc, opts);
MemoryContextSwitchTo(oldctx);
@@ -2125,7 +2289,7 @@ brin_minmax_multi_union(PG_FUNCTION_ARGS)
oldctx = MemoryContextSwitchTo(ctx);
/* allocate and fill */
- cranges = (CombineRange *)palloc0(ncranges * sizeof(CombineRange));
+ cranges = (CombineRange *) palloc0(ncranges * sizeof(CombineRange));
/* fill the combine ranges with entries for the first range */
fill_combine_ranges(cranges, ranges_a->nranges + ranges_a->nvalues,
@@ -2139,8 +2303,8 @@ brin_minmax_multi_union(PG_FUNCTION_ARGS)
cmpFn = minmax_multi_get_strategy_procinfo(bdesc, attno, attr->atttypid,
BTLessStrategyNumber);
- /* sort the combine ranges */
- sort_combine_ranges(cmpFn, colloid, cranges, ncranges);
+ /* sort the combine ranges (don't deduplicate) */
+ sort_combine_ranges(cmpFn, colloid, cranges, ncranges, false);
/*
* We've merged two different lists of ranges, so some of them may be
diff --git a/src/backend/access/brin/brin_tuple.c b/src/backend/access/brin/brin_tuple.c
index df820db029..bf8635d788 100644
--- a/src/backend/access/brin/brin_tuple.c
+++ b/src/backend/access/brin/brin_tuple.c
@@ -163,6 +163,7 @@ brin_form_tuple(BrinDesc *brdesc, BlockNumber blkno, BrinMemTuple *tuple,
if (tuple->bt_columns[keyno].bv_serialize)
{
tuple->bt_columns[keyno].bv_serialize(
+ brdesc,
tuple->bt_columns[keyno].bv_mem_value,
tuple->bt_columns[keyno].bv_values);
}
diff --git a/src/include/access/brin_tuple.h b/src/include/access/brin_tuple.h
index 66a6c3c792..e08998b71a 100644
--- a/src/include/access/brin_tuple.h
+++ b/src/include/access/brin_tuple.h
@@ -14,7 +14,7 @@
#include "access/brin_internal.h"
#include "access/tupdesc.h"
-typedef void (*brin_serialize_callback_type) (Datum src, Datum * dst);
+typedef void (*brin_serialize_callback_type) (BrinDesc *bdesc, Datum src, Datum * dst);
/*
* A BRIN index stores one index tuple per page range. Each index tuple
--
2.26.2
--------------FA974B75A0C3E9CA18CE7207
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--------------FA974B75A0C3E9CA18CE7207--
^ permalink raw reply [nested|flat] 29+ messages in thread
* [PATCH 8/8] batch build
@ 2021-01-22 00:11 Tomas Vondra <[email protected]>
0 siblings, 0 replies; 29+ messages in thread
From: Tomas Vondra @ 2021-01-22 00:11 UTC (permalink / raw)
---
src/backend/access/brin/brin_minmax_multi.c | 204 ++++++++++++++++++--
src/backend/access/brin/brin_tuple.c | 1 +
src/include/access/brin_tuple.h | 2 +-
3 files changed, 186 insertions(+), 21 deletions(-)
diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 094ecd2be9..72cca6f26b 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -57,6 +57,7 @@
#include "access/brin.h"
#include "access/brin_internal.h"
#include "access/brin_tuple.h"
+#include "access/hash.h" /* XXX strange that it fails because of BRIN_AM_OID without this */
#include "access/reloptions.h"
#include "access/stratnum.h"
#include "access/htup_details.h"
@@ -150,12 +151,23 @@ typedef struct MinMaxOptions
typedef struct Ranges
{
Oid typid;
+ Oid colloid;
+ AttrNumber attno;
/* (2*nranges + nvalues) <= maxvalues */
int nranges; /* number of ranges in the array (stored) */
int nvalues; /* number of values in the data array (all) */
int maxvalues; /* maximum number of values (reloption) */
+ /*
+ * Batch mode means we're simply appending values into new range,
+ * without any expensive steps (sorting, deduplication, ...). The
+ * buffer is sized to be much larger, but we keep the actual target
+ * size so that when serializing values we can do the right thing.
+ */
+ bool batch_mode;
+ int target_maxvalues;
+
/* values stored for this range - either raw values, or ranges */
Datum values[FLEXIBLE_ARRAY_MEMBER];
} Ranges;
@@ -375,6 +387,7 @@ range_deserialize(SerializedRanges *serialized)
range->nvalues = serialized->nvalues;
range->maxvalues = serialized->maxvalues;
range->typid = serialized->typid;
+ range->batch_mode = false;
typbyval = get_typbyval(serialized->typid);
typlen = get_typlen(serialized->typid);
@@ -844,11 +857,14 @@ fill_combine_ranges(CombineRange *cranges, int ncranges, Ranges *ranges)
/*
* Sort combine ranges using qsort (with BTLessStrategyNumber function).
*/
-static void
+static int
sort_combine_ranges(FmgrInfo *cmp, Oid colloid,
- CombineRange *cranges, int ncranges)
+ CombineRange *cranges, int ncranges,
+ bool deduplicate)
{
- compare_context cxt;
+ int n;
+ int i;
+ compare_context cxt;
/* sort the values */
cxt.colloid = colloid;
@@ -856,6 +872,24 @@ sort_combine_ranges(FmgrInfo *cmp, Oid colloid,
qsort_arg(cranges, ncranges, sizeof(CombineRange),
compare_combine_ranges, (void *) &cxt);
+
+ if (!deduplicate)
+ return ncranges;
+
+ /* optionally deduplicate the ranges */
+ n = 1;
+ for (i = 1; i < ncranges; i++)
+ {
+ if (compare_combine_ranges(&cranges[i-1], &cranges[i], (void *) &cxt))
+ {
+ if (i != n)
+ memcpy(&cranges[n], &cranges[i], sizeof(CombineRange));
+
+ n++;
+ }
+ }
+
+ return n;
}
/*
@@ -1026,26 +1060,40 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
*/
static CombineRange *
build_combine_ranges(FmgrInfo *cmp, Oid colloid, Ranges *ranges,
- Datum newvalue, int *nranges)
+ bool addvalue, Datum newvalue, int *nranges,
+ bool deduplicate)
{
int ncranges;
CombineRange *cranges;
/* now do the actual merge sort */
- ncranges = ranges->nranges + ranges->nvalues + 1;
+ ncranges = ranges->nranges + ranges->nvalues;
+
+ /* should we add an extra value? */
+ if (addvalue)
+ ncranges += 1;
+
cranges = (CombineRange *) palloc0(ncranges * sizeof(CombineRange));
- *nranges = ncranges;
/* put the new value at the beginning */
- cranges[0].minval = newvalue;
- cranges[0].maxval = newvalue;
- cranges[0].collapsed = true;
+ if (addvalue)
+ {
+ cranges[0].minval = newvalue;
+ cranges[0].maxval = newvalue;
+ cranges[0].collapsed = true;
- /* then the regular and collapsed ranges */
- fill_combine_ranges(&cranges[1], ncranges-1, ranges);
+ /* then the regular and collapsed ranges */
+ fill_combine_ranges(&cranges[1], ncranges-1, ranges);
+ }
+ else
+ fill_combine_ranges(cranges, ncranges, ranges);
/* and sort the ranges */
- sort_combine_ranges(cmp, colloid, cranges, ncranges);
+ ncranges = sort_combine_ranges(cmp, colloid, cranges, ncranges,
+ deduplicate);
+
+ /* remember how many cranges we built */
+ *nranges = ncranges;
return cranges;
}
@@ -1074,6 +1122,7 @@ count_values(CombineRange *cranges, int ncranges)
}
#endif
+
/*
* reduce_combine_ranges
* reduce the ranges until the number of values is low enough
@@ -1250,6 +1299,25 @@ range_add_value(BrinDesc *bdesc, Oid colloid,
Assert(2*ranges->nranges + ranges->nvalues <= ranges->maxvalues);
+ Assert((ranges->nranges >= 0) && (ranges->nvalues >= 0) && (ranges->maxvalues >= 0));
+
+ /*
+ * When batch-building, there should be no ranges. So either the
+ * number of ranges is 0 or we're not in batching mode.
+ */
+ Assert(!ranges->batch_mode || (ranges->nranges == 0));
+
+ /* When batch-building, just add it and we're done. */
+ if (ranges->batch_mode)
+ {
+ /* there has to be free space, if we've sized the struct */
+ Assert(ranges->nvalues < ranges->maxvalues);
+
+ ranges->values[ranges->nvalues++] = newval;
+
+ return true;
+ }
+
/*
* Bail out if the value already is covered by the range.
*
@@ -1322,7 +1390,9 @@ range_add_value(BrinDesc *bdesc, Oid colloid,
ranges->nvalues);
/* OK build the combine ranges */
- cranges = build_combine_ranges(cmpFn, colloid, ranges, newval, &ncranges);
+ cranges = build_combine_ranges(cmpFn, colloid, ranges,
+ true, newval, &ncranges,
+ false);
/* Reduce the ranges if needed */
if (ncranges > ranges->maxvalues)
@@ -1382,6 +1452,81 @@ range_add_value(BrinDesc *bdesc, Oid colloid,
return true;
}
+/*
+ * Generate range representation of data collected during "batch mode".
+ * This is similar to reduce_combine_ranges, except that we can't assume
+ * the values are sorted and there may be duplicate values.
+ */
+static void
+compactify_ranges(BrinDesc *bdesc, Ranges *ranges, int max_values)
+{
+ FmgrInfo *cmpFn,
+ *distanceFn;
+
+ /* combine ranges */
+ CombineRange *cranges;
+ int ncranges;
+ DistanceValue *distances;
+
+ MemoryContext ctx;
+ MemoryContext oldctx;
+
+ /*
+ * This should only be used in batch mode, and there should be no
+ * ranges, just individual values.
+ */
+ Assert((ranges->batch_mode) && (ranges->nranges == 0));
+
+ /* we'll certainly need the comparator, so just look it up now */
+ cmpFn = minmax_multi_get_strategy_procinfo(bdesc, ranges->attno, ranges->typid,
+ BTLessStrategyNumber);
+
+ /* and we'll also need the 'distance' procedure */
+ distanceFn = minmax_multi_get_procinfo(bdesc, ranges->attno, PROCNUM_DISTANCE);
+
+ /*
+ * The distanceFn calls (which may internally call e.g. numeric_le) may
+ * allocate quite a bit of memory, and we must not leak it. Otherwise
+ * we'd have problems e.g. when building indexes. So we create a local
+ * memory context and make sure we free the memory before leaving this
+ * function (not after every call).
+ */
+ ctx = AllocSetContextCreate(CurrentMemoryContext,
+ "minmax-multi context",
+ ALLOCSET_DEFAULT_SIZES);
+
+ oldctx = MemoryContextSwitchTo(ctx);
+
+ /* OK build the combine ranges */
+ cranges = build_combine_ranges(cmpFn, ranges->colloid, ranges,
+ false, (Datum) 0, &ncranges,
+ true); /* deduplicate */
+
+ /* build array of gap distances and sort them in ascending order */
+ distances = build_distances(distanceFn, ranges->colloid, cranges, ncranges);
+
+ /*
+ * Combine ranges until we get below max_values. We don't use any scale
+ * factor, because this is used at the very end of "batch mode" and we
+ * don't expect more tuples to be inserted soon.
+ */
+ ncranges = reduce_combine_ranges(cranges, ncranges, distances,
+ max_values, cmpFn, ranges->colloid);
+
+ Assert(count_values(cranges, ncranges) <= max_values);
+
+ /* decompose the combine ranges into regular ranges and single values */
+ store_combine_ranges(ranges, cranges, ncranges);
+
+ MemoryContextSwitchTo(oldctx);
+ MemoryContextDelete(ctx);
+
+ /* Check the ordering invariants are not violated (for both parts). */
+ AssertArrayOrder(cmpFn, ranges->colloid, ranges->values, ranges->nranges*2);
+ AssertArrayOrder(cmpFn, ranges->colloid, &ranges->values[ranges->nranges*2],
+ ranges->nvalues);
+}
+
Datum
brin_minmax_multi_opcinfo(PG_FUNCTION_ARGS)
{
@@ -1799,10 +1944,16 @@ brin_minmax_multi_distance_inet(PG_FUNCTION_ARGS)
}
static void
-brin_minmax_multi_serialize(Datum src, Datum *dst)
+brin_minmax_multi_serialize(BrinDesc *bdesc, Datum src, Datum *dst)
{
Ranges *ranges = (Ranges *) DatumGetPointer(src);
- SerializedRanges *s = range_serialize(ranges);
+ SerializedRanges *s;
+
+ /* In batch mode, we need to compress the accumulated values. */
+ if (ranges->batch_mode)
+ compactify_ranges(bdesc, ranges, ranges->target_maxvalues);
+
+ s = range_serialize(ranges);
dst[0] = PointerGetDatum(s);
}
@@ -1845,15 +1996,28 @@ brin_minmax_multi_add_value(PG_FUNCTION_ARGS)
/*
* If this is the first non-null value, we need to initialize the range
* list. Otherwise just extract the existing range list from BrinValues.
+ *
+ * When starting with an empty range, we assume this is a batch mode,
+ * i.e. we size the buffer for the maximum possible number of items in
+ * the range (based on range size and max number of items on a page).
+ *
+ * XXX This may require quite a bit of memory, so maybe we should use
+ * some value in between. OTOH most tables will have much wider rows,
+ * so the number of rows per page is much lower.
*/
if (column->bv_allnulls)
{
MemoryContext oldctx;
- oldctx = MemoryContextSwitchTo(column->bv_context);
+ BlockNumber pagesPerRange = BrinGetPagesPerRange(bdesc->bd_index);
- ranges = minmax_multi_init(brin_minmax_multi_get_values(bdesc, opts));
+ oldctx = MemoryContextSwitchTo(column->bv_context);
+ ranges = minmax_multi_init(MaxHeapTuplesPerPage * pagesPerRange);
+ ranges->attno = attno;
+ ranges->colloid = colloid;
ranges->typid = attr->atttypid;
+ ranges->batch_mode = true;
+ ranges->target_maxvalues = brin_minmax_multi_get_values(bdesc, opts);
MemoryContextSwitchTo(oldctx);
@@ -2125,7 +2289,7 @@ brin_minmax_multi_union(PG_FUNCTION_ARGS)
oldctx = MemoryContextSwitchTo(ctx);
/* allocate and fill */
- cranges = (CombineRange *)palloc0(ncranges * sizeof(CombineRange));
+ cranges = (CombineRange *) palloc0(ncranges * sizeof(CombineRange));
/* fill the combine ranges with entries for the first range */
fill_combine_ranges(cranges, ranges_a->nranges + ranges_a->nvalues,
@@ -2139,8 +2303,8 @@ brin_minmax_multi_union(PG_FUNCTION_ARGS)
cmpFn = minmax_multi_get_strategy_procinfo(bdesc, attno, attr->atttypid,
BTLessStrategyNumber);
- /* sort the combine ranges */
- sort_combine_ranges(cmpFn, colloid, cranges, ncranges);
+ /* sort the combine ranges (don't deduplicate) */
+ sort_combine_ranges(cmpFn, colloid, cranges, ncranges, false);
/*
* We've merged two different lists of ranges, so some of them may be
diff --git a/src/backend/access/brin/brin_tuple.c b/src/backend/access/brin/brin_tuple.c
index df820db029..bf8635d788 100644
--- a/src/backend/access/brin/brin_tuple.c
+++ b/src/backend/access/brin/brin_tuple.c
@@ -163,6 +163,7 @@ brin_form_tuple(BrinDesc *brdesc, BlockNumber blkno, BrinMemTuple *tuple,
if (tuple->bt_columns[keyno].bv_serialize)
{
tuple->bt_columns[keyno].bv_serialize(
+ brdesc,
tuple->bt_columns[keyno].bv_mem_value,
tuple->bt_columns[keyno].bv_values);
}
diff --git a/src/include/access/brin_tuple.h b/src/include/access/brin_tuple.h
index 66a6c3c792..e08998b71a 100644
--- a/src/include/access/brin_tuple.h
+++ b/src/include/access/brin_tuple.h
@@ -14,7 +14,7 @@
#include "access/brin_internal.h"
#include "access/tupdesc.h"
-typedef void (*brin_serialize_callback_type) (Datum src, Datum * dst);
+typedef void (*brin_serialize_callback_type) (BrinDesc *bdesc, Datum src, Datum * dst);
/*
* A BRIN index stores one index tuple per page range. Each index tuple
--
2.26.2
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--------------FA974B75A0C3E9CA18CE7207--
^ permalink raw reply [nested|flat] 29+ messages in thread
* [PATCH 8/8] batch build
@ 2021-01-22 00:11 Tomas Vondra <[email protected]>
0 siblings, 0 replies; 29+ messages in thread
From: Tomas Vondra @ 2021-01-22 00:11 UTC (permalink / raw)
---
src/backend/access/brin/brin_minmax_multi.c | 204 ++++++++++++++++++--
src/backend/access/brin/brin_tuple.c | 1 +
src/include/access/brin_tuple.h | 2 +-
3 files changed, 186 insertions(+), 21 deletions(-)
diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 094ecd2be9..72cca6f26b 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -57,6 +57,7 @@
#include "access/brin.h"
#include "access/brin_internal.h"
#include "access/brin_tuple.h"
+#include "access/hash.h" /* XXX strange that it fails because of BRIN_AM_OID without this */
#include "access/reloptions.h"
#include "access/stratnum.h"
#include "access/htup_details.h"
@@ -150,12 +151,23 @@ typedef struct MinMaxOptions
typedef struct Ranges
{
Oid typid;
+ Oid colloid;
+ AttrNumber attno;
/* (2*nranges + nvalues) <= maxvalues */
int nranges; /* number of ranges in the array (stored) */
int nvalues; /* number of values in the data array (all) */
int maxvalues; /* maximum number of values (reloption) */
+ /*
+ * Batch mode means we're simply appending values into new range,
+ * without any expensive steps (sorting, deduplication, ...). The
+ * buffer is sized to be much larger, but we keep the actual target
+ * size so that when serializing values we can do the right thing.
+ */
+ bool batch_mode;
+ int target_maxvalues;
+
/* values stored for this range - either raw values, or ranges */
Datum values[FLEXIBLE_ARRAY_MEMBER];
} Ranges;
@@ -375,6 +387,7 @@ range_deserialize(SerializedRanges *serialized)
range->nvalues = serialized->nvalues;
range->maxvalues = serialized->maxvalues;
range->typid = serialized->typid;
+ range->batch_mode = false;
typbyval = get_typbyval(serialized->typid);
typlen = get_typlen(serialized->typid);
@@ -844,11 +857,14 @@ fill_combine_ranges(CombineRange *cranges, int ncranges, Ranges *ranges)
/*
* Sort combine ranges using qsort (with BTLessStrategyNumber function).
*/
-static void
+static int
sort_combine_ranges(FmgrInfo *cmp, Oid colloid,
- CombineRange *cranges, int ncranges)
+ CombineRange *cranges, int ncranges,
+ bool deduplicate)
{
- compare_context cxt;
+ int n;
+ int i;
+ compare_context cxt;
/* sort the values */
cxt.colloid = colloid;
@@ -856,6 +872,24 @@ sort_combine_ranges(FmgrInfo *cmp, Oid colloid,
qsort_arg(cranges, ncranges, sizeof(CombineRange),
compare_combine_ranges, (void *) &cxt);
+
+ if (!deduplicate)
+ return ncranges;
+
+ /* optionally deduplicate the ranges */
+ n = 1;
+ for (i = 1; i < ncranges; i++)
+ {
+ if (compare_combine_ranges(&cranges[i-1], &cranges[i], (void *) &cxt))
+ {
+ if (i != n)
+ memcpy(&cranges[n], &cranges[i], sizeof(CombineRange));
+
+ n++;
+ }
+ }
+
+ return n;
}
/*
@@ -1026,26 +1060,40 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
*/
static CombineRange *
build_combine_ranges(FmgrInfo *cmp, Oid colloid, Ranges *ranges,
- Datum newvalue, int *nranges)
+ bool addvalue, Datum newvalue, int *nranges,
+ bool deduplicate)
{
int ncranges;
CombineRange *cranges;
/* now do the actual merge sort */
- ncranges = ranges->nranges + ranges->nvalues + 1;
+ ncranges = ranges->nranges + ranges->nvalues;
+
+ /* should we add an extra value? */
+ if (addvalue)
+ ncranges += 1;
+
cranges = (CombineRange *) palloc0(ncranges * sizeof(CombineRange));
- *nranges = ncranges;
/* put the new value at the beginning */
- cranges[0].minval = newvalue;
- cranges[0].maxval = newvalue;
- cranges[0].collapsed = true;
+ if (addvalue)
+ {
+ cranges[0].minval = newvalue;
+ cranges[0].maxval = newvalue;
+ cranges[0].collapsed = true;
- /* then the regular and collapsed ranges */
- fill_combine_ranges(&cranges[1], ncranges-1, ranges);
+ /* then the regular and collapsed ranges */
+ fill_combine_ranges(&cranges[1], ncranges-1, ranges);
+ }
+ else
+ fill_combine_ranges(cranges, ncranges, ranges);
/* and sort the ranges */
- sort_combine_ranges(cmp, colloid, cranges, ncranges);
+ ncranges = sort_combine_ranges(cmp, colloid, cranges, ncranges,
+ deduplicate);
+
+ /* remember how many cranges we built */
+ *nranges = ncranges;
return cranges;
}
@@ -1074,6 +1122,7 @@ count_values(CombineRange *cranges, int ncranges)
}
#endif
+
/*
* reduce_combine_ranges
* reduce the ranges until the number of values is low enough
@@ -1250,6 +1299,25 @@ range_add_value(BrinDesc *bdesc, Oid colloid,
Assert(2*ranges->nranges + ranges->nvalues <= ranges->maxvalues);
+ Assert((ranges->nranges >= 0) && (ranges->nvalues >= 0) && (ranges->maxvalues >= 0));
+
+ /*
+ * When batch-building, there should be no ranges. So either the
+ * number of ranges is 0 or we're not in batching mode.
+ */
+ Assert(!ranges->batch_mode || (ranges->nranges == 0));
+
+ /* When batch-building, just add it and we're done. */
+ if (ranges->batch_mode)
+ {
+ /* there has to be free space, if we've sized the struct */
+ Assert(ranges->nvalues < ranges->maxvalues);
+
+ ranges->values[ranges->nvalues++] = newval;
+
+ return true;
+ }
+
/*
* Bail out if the value already is covered by the range.
*
@@ -1322,7 +1390,9 @@ range_add_value(BrinDesc *bdesc, Oid colloid,
ranges->nvalues);
/* OK build the combine ranges */
- cranges = build_combine_ranges(cmpFn, colloid, ranges, newval, &ncranges);
+ cranges = build_combine_ranges(cmpFn, colloid, ranges,
+ true, newval, &ncranges,
+ false);
/* Reduce the ranges if needed */
if (ncranges > ranges->maxvalues)
@@ -1382,6 +1452,81 @@ range_add_value(BrinDesc *bdesc, Oid colloid,
return true;
}
+/*
+ * Generate range representation of data collected during "batch mode".
+ * This is similar to reduce_combine_ranges, except that we can't assume
+ * the values are sorted and there may be duplicate values.
+ */
+static void
+compactify_ranges(BrinDesc *bdesc, Ranges *ranges, int max_values)
+{
+ FmgrInfo *cmpFn,
+ *distanceFn;
+
+ /* combine ranges */
+ CombineRange *cranges;
+ int ncranges;
+ DistanceValue *distances;
+
+ MemoryContext ctx;
+ MemoryContext oldctx;
+
+ /*
+ * This should only be used in batch mode, and there should be no
+ * ranges, just individual values.
+ */
+ Assert((ranges->batch_mode) && (ranges->nranges == 0));
+
+ /* we'll certainly need the comparator, so just look it up now */
+ cmpFn = minmax_multi_get_strategy_procinfo(bdesc, ranges->attno, ranges->typid,
+ BTLessStrategyNumber);
+
+ /* and we'll also need the 'distance' procedure */
+ distanceFn = minmax_multi_get_procinfo(bdesc, ranges->attno, PROCNUM_DISTANCE);
+
+ /*
+ * The distanceFn calls (which may internally call e.g. numeric_le) may
+ * allocate quite a bit of memory, and we must not leak it. Otherwise
+ * we'd have problems e.g. when building indexes. So we create a local
+ * memory context and make sure we free the memory before leaving this
+ * function (not after every call).
+ */
+ ctx = AllocSetContextCreate(CurrentMemoryContext,
+ "minmax-multi context",
+ ALLOCSET_DEFAULT_SIZES);
+
+ oldctx = MemoryContextSwitchTo(ctx);
+
+ /* OK build the combine ranges */
+ cranges = build_combine_ranges(cmpFn, ranges->colloid, ranges,
+ false, (Datum) 0, &ncranges,
+ true); /* deduplicate */
+
+ /* build array of gap distances and sort them in ascending order */
+ distances = build_distances(distanceFn, ranges->colloid, cranges, ncranges);
+
+ /*
+ * Combine ranges until we get below max_values. We don't use any scale
+ * factor, because this is used at the very end of "batch mode" and we
+ * don't expect more tuples to be inserted soon.
+ */
+ ncranges = reduce_combine_ranges(cranges, ncranges, distances,
+ max_values, cmpFn, ranges->colloid);
+
+ Assert(count_values(cranges, ncranges) <= max_values);
+
+ /* decompose the combine ranges into regular ranges and single values */
+ store_combine_ranges(ranges, cranges, ncranges);
+
+ MemoryContextSwitchTo(oldctx);
+ MemoryContextDelete(ctx);
+
+ /* Check the ordering invariants are not violated (for both parts). */
+ AssertArrayOrder(cmpFn, ranges->colloid, ranges->values, ranges->nranges*2);
+ AssertArrayOrder(cmpFn, ranges->colloid, &ranges->values[ranges->nranges*2],
+ ranges->nvalues);
+}
+
Datum
brin_minmax_multi_opcinfo(PG_FUNCTION_ARGS)
{
@@ -1799,10 +1944,16 @@ brin_minmax_multi_distance_inet(PG_FUNCTION_ARGS)
}
static void
-brin_minmax_multi_serialize(Datum src, Datum *dst)
+brin_minmax_multi_serialize(BrinDesc *bdesc, Datum src, Datum *dst)
{
Ranges *ranges = (Ranges *) DatumGetPointer(src);
- SerializedRanges *s = range_serialize(ranges);
+ SerializedRanges *s;
+
+ /* In batch mode, we need to compress the accumulated values. */
+ if (ranges->batch_mode)
+ compactify_ranges(bdesc, ranges, ranges->target_maxvalues);
+
+ s = range_serialize(ranges);
dst[0] = PointerGetDatum(s);
}
@@ -1845,15 +1996,28 @@ brin_minmax_multi_add_value(PG_FUNCTION_ARGS)
/*
* If this is the first non-null value, we need to initialize the range
* list. Otherwise just extract the existing range list from BrinValues.
+ *
+ * When starting with an empty range, we assume this is a batch mode,
+ * i.e. we size the buffer for the maximum possible number of items in
+ * the range (based on range size and max number of items on a page).
+ *
+ * XXX This may require quite a bit of memory, so maybe we should use
+ * some value in between. OTOH most tables will have much wider rows,
+ * so the number of rows per page is much lower.
*/
if (column->bv_allnulls)
{
MemoryContext oldctx;
- oldctx = MemoryContextSwitchTo(column->bv_context);
+ BlockNumber pagesPerRange = BrinGetPagesPerRange(bdesc->bd_index);
- ranges = minmax_multi_init(brin_minmax_multi_get_values(bdesc, opts));
+ oldctx = MemoryContextSwitchTo(column->bv_context);
+ ranges = minmax_multi_init(MaxHeapTuplesPerPage * pagesPerRange);
+ ranges->attno = attno;
+ ranges->colloid = colloid;
ranges->typid = attr->atttypid;
+ ranges->batch_mode = true;
+ ranges->target_maxvalues = brin_minmax_multi_get_values(bdesc, opts);
MemoryContextSwitchTo(oldctx);
@@ -2125,7 +2289,7 @@ brin_minmax_multi_union(PG_FUNCTION_ARGS)
oldctx = MemoryContextSwitchTo(ctx);
/* allocate and fill */
- cranges = (CombineRange *)palloc0(ncranges * sizeof(CombineRange));
+ cranges = (CombineRange *) palloc0(ncranges * sizeof(CombineRange));
/* fill the combine ranges with entries for the first range */
fill_combine_ranges(cranges, ranges_a->nranges + ranges_a->nvalues,
@@ -2139,8 +2303,8 @@ brin_minmax_multi_union(PG_FUNCTION_ARGS)
cmpFn = minmax_multi_get_strategy_procinfo(bdesc, attno, attr->atttypid,
BTLessStrategyNumber);
- /* sort the combine ranges */
- sort_combine_ranges(cmpFn, colloid, cranges, ncranges);
+ /* sort the combine ranges (don't deduplicate) */
+ sort_combine_ranges(cmpFn, colloid, cranges, ncranges, false);
/*
* We've merged two different lists of ranges, so some of them may be
diff --git a/src/backend/access/brin/brin_tuple.c b/src/backend/access/brin/brin_tuple.c
index df820db029..bf8635d788 100644
--- a/src/backend/access/brin/brin_tuple.c
+++ b/src/backend/access/brin/brin_tuple.c
@@ -163,6 +163,7 @@ brin_form_tuple(BrinDesc *brdesc, BlockNumber blkno, BrinMemTuple *tuple,
if (tuple->bt_columns[keyno].bv_serialize)
{
tuple->bt_columns[keyno].bv_serialize(
+ brdesc,
tuple->bt_columns[keyno].bv_mem_value,
tuple->bt_columns[keyno].bv_values);
}
diff --git a/src/include/access/brin_tuple.h b/src/include/access/brin_tuple.h
index 66a6c3c792..e08998b71a 100644
--- a/src/include/access/brin_tuple.h
+++ b/src/include/access/brin_tuple.h
@@ -14,7 +14,7 @@
#include "access/brin_internal.h"
#include "access/tupdesc.h"
-typedef void (*brin_serialize_callback_type) (Datum src, Datum * dst);
+typedef void (*brin_serialize_callback_type) (BrinDesc *bdesc, Datum src, Datum * dst);
/*
* A BRIN index stores one index tuple per page range. Each index tuple
--
2.26.2
--------------FA974B75A0C3E9CA18CE7207
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--------------FA974B75A0C3E9CA18CE7207--
^ permalink raw reply [nested|flat] 29+ messages in thread
* [PATCH 8/8] batch build
@ 2021-01-22 00:11 Tomas Vondra <[email protected]>
0 siblings, 0 replies; 29+ messages in thread
From: Tomas Vondra @ 2021-01-22 00:11 UTC (permalink / raw)
---
src/backend/access/brin/brin_minmax_multi.c | 204 ++++++++++++++++++--
src/backend/access/brin/brin_tuple.c | 1 +
src/include/access/brin_tuple.h | 2 +-
3 files changed, 186 insertions(+), 21 deletions(-)
diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 094ecd2be9..72cca6f26b 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -57,6 +57,7 @@
#include "access/brin.h"
#include "access/brin_internal.h"
#include "access/brin_tuple.h"
+#include "access/hash.h" /* XXX strange that it fails because of BRIN_AM_OID without this */
#include "access/reloptions.h"
#include "access/stratnum.h"
#include "access/htup_details.h"
@@ -150,12 +151,23 @@ typedef struct MinMaxOptions
typedef struct Ranges
{
Oid typid;
+ Oid colloid;
+ AttrNumber attno;
/* (2*nranges + nvalues) <= maxvalues */
int nranges; /* number of ranges in the array (stored) */
int nvalues; /* number of values in the data array (all) */
int maxvalues; /* maximum number of values (reloption) */
+ /*
+ * Batch mode means we're simply appending values into new range,
+ * without any expensive steps (sorting, deduplication, ...). The
+ * buffer is sized to be much larger, but we keep the actual target
+ * size so that when serializing values we can do the right thing.
+ */
+ bool batch_mode;
+ int target_maxvalues;
+
/* values stored for this range - either raw values, or ranges */
Datum values[FLEXIBLE_ARRAY_MEMBER];
} Ranges;
@@ -375,6 +387,7 @@ range_deserialize(SerializedRanges *serialized)
range->nvalues = serialized->nvalues;
range->maxvalues = serialized->maxvalues;
range->typid = serialized->typid;
+ range->batch_mode = false;
typbyval = get_typbyval(serialized->typid);
typlen = get_typlen(serialized->typid);
@@ -844,11 +857,14 @@ fill_combine_ranges(CombineRange *cranges, int ncranges, Ranges *ranges)
/*
* Sort combine ranges using qsort (with BTLessStrategyNumber function).
*/
-static void
+static int
sort_combine_ranges(FmgrInfo *cmp, Oid colloid,
- CombineRange *cranges, int ncranges)
+ CombineRange *cranges, int ncranges,
+ bool deduplicate)
{
- compare_context cxt;
+ int n;
+ int i;
+ compare_context cxt;
/* sort the values */
cxt.colloid = colloid;
@@ -856,6 +872,24 @@ sort_combine_ranges(FmgrInfo *cmp, Oid colloid,
qsort_arg(cranges, ncranges, sizeof(CombineRange),
compare_combine_ranges, (void *) &cxt);
+
+ if (!deduplicate)
+ return ncranges;
+
+ /* optionally deduplicate the ranges */
+ n = 1;
+ for (i = 1; i < ncranges; i++)
+ {
+ if (compare_combine_ranges(&cranges[i-1], &cranges[i], (void *) &cxt))
+ {
+ if (i != n)
+ memcpy(&cranges[n], &cranges[i], sizeof(CombineRange));
+
+ n++;
+ }
+ }
+
+ return n;
}
/*
@@ -1026,26 +1060,40 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
*/
static CombineRange *
build_combine_ranges(FmgrInfo *cmp, Oid colloid, Ranges *ranges,
- Datum newvalue, int *nranges)
+ bool addvalue, Datum newvalue, int *nranges,
+ bool deduplicate)
{
int ncranges;
CombineRange *cranges;
/* now do the actual merge sort */
- ncranges = ranges->nranges + ranges->nvalues + 1;
+ ncranges = ranges->nranges + ranges->nvalues;
+
+ /* should we add an extra value? */
+ if (addvalue)
+ ncranges += 1;
+
cranges = (CombineRange *) palloc0(ncranges * sizeof(CombineRange));
- *nranges = ncranges;
/* put the new value at the beginning */
- cranges[0].minval = newvalue;
- cranges[0].maxval = newvalue;
- cranges[0].collapsed = true;
+ if (addvalue)
+ {
+ cranges[0].minval = newvalue;
+ cranges[0].maxval = newvalue;
+ cranges[0].collapsed = true;
- /* then the regular and collapsed ranges */
- fill_combine_ranges(&cranges[1], ncranges-1, ranges);
+ /* then the regular and collapsed ranges */
+ fill_combine_ranges(&cranges[1], ncranges-1, ranges);
+ }
+ else
+ fill_combine_ranges(cranges, ncranges, ranges);
/* and sort the ranges */
- sort_combine_ranges(cmp, colloid, cranges, ncranges);
+ ncranges = sort_combine_ranges(cmp, colloid, cranges, ncranges,
+ deduplicate);
+
+ /* remember how many cranges we built */
+ *nranges = ncranges;
return cranges;
}
@@ -1074,6 +1122,7 @@ count_values(CombineRange *cranges, int ncranges)
}
#endif
+
/*
* reduce_combine_ranges
* reduce the ranges until the number of values is low enough
@@ -1250,6 +1299,25 @@ range_add_value(BrinDesc *bdesc, Oid colloid,
Assert(2*ranges->nranges + ranges->nvalues <= ranges->maxvalues);
+ Assert((ranges->nranges >= 0) && (ranges->nvalues >= 0) && (ranges->maxvalues >= 0));
+
+ /*
+ * When batch-building, there should be no ranges. So either the
+ * number of ranges is 0 or we're not in batching mode.
+ */
+ Assert(!ranges->batch_mode || (ranges->nranges == 0));
+
+ /* When batch-building, just add it and we're done. */
+ if (ranges->batch_mode)
+ {
+ /* there has to be free space, if we've sized the struct */
+ Assert(ranges->nvalues < ranges->maxvalues);
+
+ ranges->values[ranges->nvalues++] = newval;
+
+ return true;
+ }
+
/*
* Bail out if the value already is covered by the range.
*
@@ -1322,7 +1390,9 @@ range_add_value(BrinDesc *bdesc, Oid colloid,
ranges->nvalues);
/* OK build the combine ranges */
- cranges = build_combine_ranges(cmpFn, colloid, ranges, newval, &ncranges);
+ cranges = build_combine_ranges(cmpFn, colloid, ranges,
+ true, newval, &ncranges,
+ false);
/* Reduce the ranges if needed */
if (ncranges > ranges->maxvalues)
@@ -1382,6 +1452,81 @@ range_add_value(BrinDesc *bdesc, Oid colloid,
return true;
}
+/*
+ * Generate range representation of data collected during "batch mode".
+ * This is similar to reduce_combine_ranges, except that we can't assume
+ * the values are sorted and there may be duplicate values.
+ */
+static void
+compactify_ranges(BrinDesc *bdesc, Ranges *ranges, int max_values)
+{
+ FmgrInfo *cmpFn,
+ *distanceFn;
+
+ /* combine ranges */
+ CombineRange *cranges;
+ int ncranges;
+ DistanceValue *distances;
+
+ MemoryContext ctx;
+ MemoryContext oldctx;
+
+ /*
+ * This should only be used in batch mode, and there should be no
+ * ranges, just individual values.
+ */
+ Assert((ranges->batch_mode) && (ranges->nranges == 0));
+
+ /* we'll certainly need the comparator, so just look it up now */
+ cmpFn = minmax_multi_get_strategy_procinfo(bdesc, ranges->attno, ranges->typid,
+ BTLessStrategyNumber);
+
+ /* and we'll also need the 'distance' procedure */
+ distanceFn = minmax_multi_get_procinfo(bdesc, ranges->attno, PROCNUM_DISTANCE);
+
+ /*
+ * The distanceFn calls (which may internally call e.g. numeric_le) may
+ * allocate quite a bit of memory, and we must not leak it. Otherwise
+ * we'd have problems e.g. when building indexes. So we create a local
+ * memory context and make sure we free the memory before leaving this
+ * function (not after every call).
+ */
+ ctx = AllocSetContextCreate(CurrentMemoryContext,
+ "minmax-multi context",
+ ALLOCSET_DEFAULT_SIZES);
+
+ oldctx = MemoryContextSwitchTo(ctx);
+
+ /* OK build the combine ranges */
+ cranges = build_combine_ranges(cmpFn, ranges->colloid, ranges,
+ false, (Datum) 0, &ncranges,
+ true); /* deduplicate */
+
+ /* build array of gap distances and sort them in ascending order */
+ distances = build_distances(distanceFn, ranges->colloid, cranges, ncranges);
+
+ /*
+ * Combine ranges until we get below max_values. We don't use any scale
+ * factor, because this is used at the very end of "batch mode" and we
+ * don't expect more tuples to be inserted soon.
+ */
+ ncranges = reduce_combine_ranges(cranges, ncranges, distances,
+ max_values, cmpFn, ranges->colloid);
+
+ Assert(count_values(cranges, ncranges) <= max_values);
+
+ /* decompose the combine ranges into regular ranges and single values */
+ store_combine_ranges(ranges, cranges, ncranges);
+
+ MemoryContextSwitchTo(oldctx);
+ MemoryContextDelete(ctx);
+
+ /* Check the ordering invariants are not violated (for both parts). */
+ AssertArrayOrder(cmpFn, ranges->colloid, ranges->values, ranges->nranges*2);
+ AssertArrayOrder(cmpFn, ranges->colloid, &ranges->values[ranges->nranges*2],
+ ranges->nvalues);
+}
+
Datum
brin_minmax_multi_opcinfo(PG_FUNCTION_ARGS)
{
@@ -1799,10 +1944,16 @@ brin_minmax_multi_distance_inet(PG_FUNCTION_ARGS)
}
static void
-brin_minmax_multi_serialize(Datum src, Datum *dst)
+brin_minmax_multi_serialize(BrinDesc *bdesc, Datum src, Datum *dst)
{
Ranges *ranges = (Ranges *) DatumGetPointer(src);
- SerializedRanges *s = range_serialize(ranges);
+ SerializedRanges *s;
+
+ /* In batch mode, we need to compress the accumulated values. */
+ if (ranges->batch_mode)
+ compactify_ranges(bdesc, ranges, ranges->target_maxvalues);
+
+ s = range_serialize(ranges);
dst[0] = PointerGetDatum(s);
}
@@ -1845,15 +1996,28 @@ brin_minmax_multi_add_value(PG_FUNCTION_ARGS)
/*
* If this is the first non-null value, we need to initialize the range
* list. Otherwise just extract the existing range list from BrinValues.
+ *
+ * When starting with an empty range, we assume this is a batch mode,
+ * i.e. we size the buffer for the maximum possible number of items in
+ * the range (based on range size and max number of items on a page).
+ *
+ * XXX This may require quite a bit of memory, so maybe we should use
+ * some value in between. OTOH most tables will have much wider rows,
+ * so the number of rows per page is much lower.
*/
if (column->bv_allnulls)
{
MemoryContext oldctx;
- oldctx = MemoryContextSwitchTo(column->bv_context);
+ BlockNumber pagesPerRange = BrinGetPagesPerRange(bdesc->bd_index);
- ranges = minmax_multi_init(brin_minmax_multi_get_values(bdesc, opts));
+ oldctx = MemoryContextSwitchTo(column->bv_context);
+ ranges = minmax_multi_init(MaxHeapTuplesPerPage * pagesPerRange);
+ ranges->attno = attno;
+ ranges->colloid = colloid;
ranges->typid = attr->atttypid;
+ ranges->batch_mode = true;
+ ranges->target_maxvalues = brin_minmax_multi_get_values(bdesc, opts);
MemoryContextSwitchTo(oldctx);
@@ -2125,7 +2289,7 @@ brin_minmax_multi_union(PG_FUNCTION_ARGS)
oldctx = MemoryContextSwitchTo(ctx);
/* allocate and fill */
- cranges = (CombineRange *)palloc0(ncranges * sizeof(CombineRange));
+ cranges = (CombineRange *) palloc0(ncranges * sizeof(CombineRange));
/* fill the combine ranges with entries for the first range */
fill_combine_ranges(cranges, ranges_a->nranges + ranges_a->nvalues,
@@ -2139,8 +2303,8 @@ brin_minmax_multi_union(PG_FUNCTION_ARGS)
cmpFn = minmax_multi_get_strategy_procinfo(bdesc, attno, attr->atttypid,
BTLessStrategyNumber);
- /* sort the combine ranges */
- sort_combine_ranges(cmpFn, colloid, cranges, ncranges);
+ /* sort the combine ranges (don't deduplicate) */
+ sort_combine_ranges(cmpFn, colloid, cranges, ncranges, false);
/*
* We've merged two different lists of ranges, so some of them may be
diff --git a/src/backend/access/brin/brin_tuple.c b/src/backend/access/brin/brin_tuple.c
index df820db029..bf8635d788 100644
--- a/src/backend/access/brin/brin_tuple.c
+++ b/src/backend/access/brin/brin_tuple.c
@@ -163,6 +163,7 @@ brin_form_tuple(BrinDesc *brdesc, BlockNumber blkno, BrinMemTuple *tuple,
if (tuple->bt_columns[keyno].bv_serialize)
{
tuple->bt_columns[keyno].bv_serialize(
+ brdesc,
tuple->bt_columns[keyno].bv_mem_value,
tuple->bt_columns[keyno].bv_values);
}
diff --git a/src/include/access/brin_tuple.h b/src/include/access/brin_tuple.h
index 66a6c3c792..e08998b71a 100644
--- a/src/include/access/brin_tuple.h
+++ b/src/include/access/brin_tuple.h
@@ -14,7 +14,7 @@
#include "access/brin_internal.h"
#include "access/tupdesc.h"
-typedef void (*brin_serialize_callback_type) (Datum src, Datum * dst);
+typedef void (*brin_serialize_callback_type) (BrinDesc *bdesc, Datum src, Datum * dst);
/*
* A BRIN index stores one index tuple per page range. Each index tuple
--
2.26.2
--------------FA974B75A0C3E9CA18CE7207
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name="brin.sh"
Content-Transfer-Encoding: base64
Content-Disposition: attachment;
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--------------FA974B75A0C3E9CA18CE7207--
^ permalink raw reply [nested|flat] 29+ messages in thread
* [PATCH 8/8] batch build
@ 2021-01-22 00:11 Tomas Vondra <[email protected]>
0 siblings, 0 replies; 29+ messages in thread
From: Tomas Vondra @ 2021-01-22 00:11 UTC (permalink / raw)
---
src/backend/access/brin/brin_minmax_multi.c | 204 ++++++++++++++++++--
src/backend/access/brin/brin_tuple.c | 1 +
src/include/access/brin_tuple.h | 2 +-
3 files changed, 186 insertions(+), 21 deletions(-)
diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 094ecd2be9..72cca6f26b 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -57,6 +57,7 @@
#include "access/brin.h"
#include "access/brin_internal.h"
#include "access/brin_tuple.h"
+#include "access/hash.h" /* XXX strange that it fails because of BRIN_AM_OID without this */
#include "access/reloptions.h"
#include "access/stratnum.h"
#include "access/htup_details.h"
@@ -150,12 +151,23 @@ typedef struct MinMaxOptions
typedef struct Ranges
{
Oid typid;
+ Oid colloid;
+ AttrNumber attno;
/* (2*nranges + nvalues) <= maxvalues */
int nranges; /* number of ranges in the array (stored) */
int nvalues; /* number of values in the data array (all) */
int maxvalues; /* maximum number of values (reloption) */
+ /*
+ * Batch mode means we're simply appending values into new range,
+ * without any expensive steps (sorting, deduplication, ...). The
+ * buffer is sized to be much larger, but we keep the actual target
+ * size so that when serializing values we can do the right thing.
+ */
+ bool batch_mode;
+ int target_maxvalues;
+
/* values stored for this range - either raw values, or ranges */
Datum values[FLEXIBLE_ARRAY_MEMBER];
} Ranges;
@@ -375,6 +387,7 @@ range_deserialize(SerializedRanges *serialized)
range->nvalues = serialized->nvalues;
range->maxvalues = serialized->maxvalues;
range->typid = serialized->typid;
+ range->batch_mode = false;
typbyval = get_typbyval(serialized->typid);
typlen = get_typlen(serialized->typid);
@@ -844,11 +857,14 @@ fill_combine_ranges(CombineRange *cranges, int ncranges, Ranges *ranges)
/*
* Sort combine ranges using qsort (with BTLessStrategyNumber function).
*/
-static void
+static int
sort_combine_ranges(FmgrInfo *cmp, Oid colloid,
- CombineRange *cranges, int ncranges)
+ CombineRange *cranges, int ncranges,
+ bool deduplicate)
{
- compare_context cxt;
+ int n;
+ int i;
+ compare_context cxt;
/* sort the values */
cxt.colloid = colloid;
@@ -856,6 +872,24 @@ sort_combine_ranges(FmgrInfo *cmp, Oid colloid,
qsort_arg(cranges, ncranges, sizeof(CombineRange),
compare_combine_ranges, (void *) &cxt);
+
+ if (!deduplicate)
+ return ncranges;
+
+ /* optionally deduplicate the ranges */
+ n = 1;
+ for (i = 1; i < ncranges; i++)
+ {
+ if (compare_combine_ranges(&cranges[i-1], &cranges[i], (void *) &cxt))
+ {
+ if (i != n)
+ memcpy(&cranges[n], &cranges[i], sizeof(CombineRange));
+
+ n++;
+ }
+ }
+
+ return n;
}
/*
@@ -1026,26 +1060,40 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
*/
static CombineRange *
build_combine_ranges(FmgrInfo *cmp, Oid colloid, Ranges *ranges,
- Datum newvalue, int *nranges)
+ bool addvalue, Datum newvalue, int *nranges,
+ bool deduplicate)
{
int ncranges;
CombineRange *cranges;
/* now do the actual merge sort */
- ncranges = ranges->nranges + ranges->nvalues + 1;
+ ncranges = ranges->nranges + ranges->nvalues;
+
+ /* should we add an extra value? */
+ if (addvalue)
+ ncranges += 1;
+
cranges = (CombineRange *) palloc0(ncranges * sizeof(CombineRange));
- *nranges = ncranges;
/* put the new value at the beginning */
- cranges[0].minval = newvalue;
- cranges[0].maxval = newvalue;
- cranges[0].collapsed = true;
+ if (addvalue)
+ {
+ cranges[0].minval = newvalue;
+ cranges[0].maxval = newvalue;
+ cranges[0].collapsed = true;
- /* then the regular and collapsed ranges */
- fill_combine_ranges(&cranges[1], ncranges-1, ranges);
+ /* then the regular and collapsed ranges */
+ fill_combine_ranges(&cranges[1], ncranges-1, ranges);
+ }
+ else
+ fill_combine_ranges(cranges, ncranges, ranges);
/* and sort the ranges */
- sort_combine_ranges(cmp, colloid, cranges, ncranges);
+ ncranges = sort_combine_ranges(cmp, colloid, cranges, ncranges,
+ deduplicate);
+
+ /* remember how many cranges we built */
+ *nranges = ncranges;
return cranges;
}
@@ -1074,6 +1122,7 @@ count_values(CombineRange *cranges, int ncranges)
}
#endif
+
/*
* reduce_combine_ranges
* reduce the ranges until the number of values is low enough
@@ -1250,6 +1299,25 @@ range_add_value(BrinDesc *bdesc, Oid colloid,
Assert(2*ranges->nranges + ranges->nvalues <= ranges->maxvalues);
+ Assert((ranges->nranges >= 0) && (ranges->nvalues >= 0) && (ranges->maxvalues >= 0));
+
+ /*
+ * When batch-building, there should be no ranges. So either the
+ * number of ranges is 0 or we're not in batching mode.
+ */
+ Assert(!ranges->batch_mode || (ranges->nranges == 0));
+
+ /* When batch-building, just add it and we're done. */
+ if (ranges->batch_mode)
+ {
+ /* there has to be free space, if we've sized the struct */
+ Assert(ranges->nvalues < ranges->maxvalues);
+
+ ranges->values[ranges->nvalues++] = newval;
+
+ return true;
+ }
+
/*
* Bail out if the value already is covered by the range.
*
@@ -1322,7 +1390,9 @@ range_add_value(BrinDesc *bdesc, Oid colloid,
ranges->nvalues);
/* OK build the combine ranges */
- cranges = build_combine_ranges(cmpFn, colloid, ranges, newval, &ncranges);
+ cranges = build_combine_ranges(cmpFn, colloid, ranges,
+ true, newval, &ncranges,
+ false);
/* Reduce the ranges if needed */
if (ncranges > ranges->maxvalues)
@@ -1382,6 +1452,81 @@ range_add_value(BrinDesc *bdesc, Oid colloid,
return true;
}
+/*
+ * Generate range representation of data collected during "batch mode".
+ * This is similar to reduce_combine_ranges, except that we can't assume
+ * the values are sorted and there may be duplicate values.
+ */
+static void
+compactify_ranges(BrinDesc *bdesc, Ranges *ranges, int max_values)
+{
+ FmgrInfo *cmpFn,
+ *distanceFn;
+
+ /* combine ranges */
+ CombineRange *cranges;
+ int ncranges;
+ DistanceValue *distances;
+
+ MemoryContext ctx;
+ MemoryContext oldctx;
+
+ /*
+ * This should only be used in batch mode, and there should be no
+ * ranges, just individual values.
+ */
+ Assert((ranges->batch_mode) && (ranges->nranges == 0));
+
+ /* we'll certainly need the comparator, so just look it up now */
+ cmpFn = minmax_multi_get_strategy_procinfo(bdesc, ranges->attno, ranges->typid,
+ BTLessStrategyNumber);
+
+ /* and we'll also need the 'distance' procedure */
+ distanceFn = minmax_multi_get_procinfo(bdesc, ranges->attno, PROCNUM_DISTANCE);
+
+ /*
+ * The distanceFn calls (which may internally call e.g. numeric_le) may
+ * allocate quite a bit of memory, and we must not leak it. Otherwise
+ * we'd have problems e.g. when building indexes. So we create a local
+ * memory context and make sure we free the memory before leaving this
+ * function (not after every call).
+ */
+ ctx = AllocSetContextCreate(CurrentMemoryContext,
+ "minmax-multi context",
+ ALLOCSET_DEFAULT_SIZES);
+
+ oldctx = MemoryContextSwitchTo(ctx);
+
+ /* OK build the combine ranges */
+ cranges = build_combine_ranges(cmpFn, ranges->colloid, ranges,
+ false, (Datum) 0, &ncranges,
+ true); /* deduplicate */
+
+ /* build array of gap distances and sort them in ascending order */
+ distances = build_distances(distanceFn, ranges->colloid, cranges, ncranges);
+
+ /*
+ * Combine ranges until we get below max_values. We don't use any scale
+ * factor, because this is used at the very end of "batch mode" and we
+ * don't expect more tuples to be inserted soon.
+ */
+ ncranges = reduce_combine_ranges(cranges, ncranges, distances,
+ max_values, cmpFn, ranges->colloid);
+
+ Assert(count_values(cranges, ncranges) <= max_values);
+
+ /* decompose the combine ranges into regular ranges and single values */
+ store_combine_ranges(ranges, cranges, ncranges);
+
+ MemoryContextSwitchTo(oldctx);
+ MemoryContextDelete(ctx);
+
+ /* Check the ordering invariants are not violated (for both parts). */
+ AssertArrayOrder(cmpFn, ranges->colloid, ranges->values, ranges->nranges*2);
+ AssertArrayOrder(cmpFn, ranges->colloid, &ranges->values[ranges->nranges*2],
+ ranges->nvalues);
+}
+
Datum
brin_minmax_multi_opcinfo(PG_FUNCTION_ARGS)
{
@@ -1799,10 +1944,16 @@ brin_minmax_multi_distance_inet(PG_FUNCTION_ARGS)
}
static void
-brin_minmax_multi_serialize(Datum src, Datum *dst)
+brin_minmax_multi_serialize(BrinDesc *bdesc, Datum src, Datum *dst)
{
Ranges *ranges = (Ranges *) DatumGetPointer(src);
- SerializedRanges *s = range_serialize(ranges);
+ SerializedRanges *s;
+
+ /* In batch mode, we need to compress the accumulated values. */
+ if (ranges->batch_mode)
+ compactify_ranges(bdesc, ranges, ranges->target_maxvalues);
+
+ s = range_serialize(ranges);
dst[0] = PointerGetDatum(s);
}
@@ -1845,15 +1996,28 @@ brin_minmax_multi_add_value(PG_FUNCTION_ARGS)
/*
* If this is the first non-null value, we need to initialize the range
* list. Otherwise just extract the existing range list from BrinValues.
+ *
+ * When starting with an empty range, we assume this is a batch mode,
+ * i.e. we size the buffer for the maximum possible number of items in
+ * the range (based on range size and max number of items on a page).
+ *
+ * XXX This may require quite a bit of memory, so maybe we should use
+ * some value in between. OTOH most tables will have much wider rows,
+ * so the number of rows per page is much lower.
*/
if (column->bv_allnulls)
{
MemoryContext oldctx;
- oldctx = MemoryContextSwitchTo(column->bv_context);
+ BlockNumber pagesPerRange = BrinGetPagesPerRange(bdesc->bd_index);
- ranges = minmax_multi_init(brin_minmax_multi_get_values(bdesc, opts));
+ oldctx = MemoryContextSwitchTo(column->bv_context);
+ ranges = minmax_multi_init(MaxHeapTuplesPerPage * pagesPerRange);
+ ranges->attno = attno;
+ ranges->colloid = colloid;
ranges->typid = attr->atttypid;
+ ranges->batch_mode = true;
+ ranges->target_maxvalues = brin_minmax_multi_get_values(bdesc, opts);
MemoryContextSwitchTo(oldctx);
@@ -2125,7 +2289,7 @@ brin_minmax_multi_union(PG_FUNCTION_ARGS)
oldctx = MemoryContextSwitchTo(ctx);
/* allocate and fill */
- cranges = (CombineRange *)palloc0(ncranges * sizeof(CombineRange));
+ cranges = (CombineRange *) palloc0(ncranges * sizeof(CombineRange));
/* fill the combine ranges with entries for the first range */
fill_combine_ranges(cranges, ranges_a->nranges + ranges_a->nvalues,
@@ -2139,8 +2303,8 @@ brin_minmax_multi_union(PG_FUNCTION_ARGS)
cmpFn = minmax_multi_get_strategy_procinfo(bdesc, attno, attr->atttypid,
BTLessStrategyNumber);
- /* sort the combine ranges */
- sort_combine_ranges(cmpFn, colloid, cranges, ncranges);
+ /* sort the combine ranges (don't deduplicate) */
+ sort_combine_ranges(cmpFn, colloid, cranges, ncranges, false);
/*
* We've merged two different lists of ranges, so some of them may be
diff --git a/src/backend/access/brin/brin_tuple.c b/src/backend/access/brin/brin_tuple.c
index df820db029..bf8635d788 100644
--- a/src/backend/access/brin/brin_tuple.c
+++ b/src/backend/access/brin/brin_tuple.c
@@ -163,6 +163,7 @@ brin_form_tuple(BrinDesc *brdesc, BlockNumber blkno, BrinMemTuple *tuple,
if (tuple->bt_columns[keyno].bv_serialize)
{
tuple->bt_columns[keyno].bv_serialize(
+ brdesc,
tuple->bt_columns[keyno].bv_mem_value,
tuple->bt_columns[keyno].bv_values);
}
diff --git a/src/include/access/brin_tuple.h b/src/include/access/brin_tuple.h
index 66a6c3c792..e08998b71a 100644
--- a/src/include/access/brin_tuple.h
+++ b/src/include/access/brin_tuple.h
@@ -14,7 +14,7 @@
#include "access/brin_internal.h"
#include "access/tupdesc.h"
-typedef void (*brin_serialize_callback_type) (Datum src, Datum * dst);
+typedef void (*brin_serialize_callback_type) (BrinDesc *bdesc, Datum src, Datum * dst);
/*
* A BRIN index stores one index tuple per page range. Each index tuple
--
2.26.2
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--------------FA974B75A0C3E9CA18CE7207--
^ permalink raw reply [nested|flat] 29+ messages in thread
* [PATCH 8/8] batch build
@ 2021-01-22 00:11 Tomas Vondra <[email protected]>
0 siblings, 0 replies; 29+ messages in thread
From: Tomas Vondra @ 2021-01-22 00:11 UTC (permalink / raw)
---
src/backend/access/brin/brin_minmax_multi.c | 204 ++++++++++++++++++--
src/backend/access/brin/brin_tuple.c | 1 +
src/include/access/brin_tuple.h | 2 +-
3 files changed, 186 insertions(+), 21 deletions(-)
diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 094ecd2be9..72cca6f26b 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -57,6 +57,7 @@
#include "access/brin.h"
#include "access/brin_internal.h"
#include "access/brin_tuple.h"
+#include "access/hash.h" /* XXX strange that it fails because of BRIN_AM_OID without this */
#include "access/reloptions.h"
#include "access/stratnum.h"
#include "access/htup_details.h"
@@ -150,12 +151,23 @@ typedef struct MinMaxOptions
typedef struct Ranges
{
Oid typid;
+ Oid colloid;
+ AttrNumber attno;
/* (2*nranges + nvalues) <= maxvalues */
int nranges; /* number of ranges in the array (stored) */
int nvalues; /* number of values in the data array (all) */
int maxvalues; /* maximum number of values (reloption) */
+ /*
+ * Batch mode means we're simply appending values into new range,
+ * without any expensive steps (sorting, deduplication, ...). The
+ * buffer is sized to be much larger, but we keep the actual target
+ * size so that when serializing values we can do the right thing.
+ */
+ bool batch_mode;
+ int target_maxvalues;
+
/* values stored for this range - either raw values, or ranges */
Datum values[FLEXIBLE_ARRAY_MEMBER];
} Ranges;
@@ -375,6 +387,7 @@ range_deserialize(SerializedRanges *serialized)
range->nvalues = serialized->nvalues;
range->maxvalues = serialized->maxvalues;
range->typid = serialized->typid;
+ range->batch_mode = false;
typbyval = get_typbyval(serialized->typid);
typlen = get_typlen(serialized->typid);
@@ -844,11 +857,14 @@ fill_combine_ranges(CombineRange *cranges, int ncranges, Ranges *ranges)
/*
* Sort combine ranges using qsort (with BTLessStrategyNumber function).
*/
-static void
+static int
sort_combine_ranges(FmgrInfo *cmp, Oid colloid,
- CombineRange *cranges, int ncranges)
+ CombineRange *cranges, int ncranges,
+ bool deduplicate)
{
- compare_context cxt;
+ int n;
+ int i;
+ compare_context cxt;
/* sort the values */
cxt.colloid = colloid;
@@ -856,6 +872,24 @@ sort_combine_ranges(FmgrInfo *cmp, Oid colloid,
qsort_arg(cranges, ncranges, sizeof(CombineRange),
compare_combine_ranges, (void *) &cxt);
+
+ if (!deduplicate)
+ return ncranges;
+
+ /* optionally deduplicate the ranges */
+ n = 1;
+ for (i = 1; i < ncranges; i++)
+ {
+ if (compare_combine_ranges(&cranges[i-1], &cranges[i], (void *) &cxt))
+ {
+ if (i != n)
+ memcpy(&cranges[n], &cranges[i], sizeof(CombineRange));
+
+ n++;
+ }
+ }
+
+ return n;
}
/*
@@ -1026,26 +1060,40 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
*/
static CombineRange *
build_combine_ranges(FmgrInfo *cmp, Oid colloid, Ranges *ranges,
- Datum newvalue, int *nranges)
+ bool addvalue, Datum newvalue, int *nranges,
+ bool deduplicate)
{
int ncranges;
CombineRange *cranges;
/* now do the actual merge sort */
- ncranges = ranges->nranges + ranges->nvalues + 1;
+ ncranges = ranges->nranges + ranges->nvalues;
+
+ /* should we add an extra value? */
+ if (addvalue)
+ ncranges += 1;
+
cranges = (CombineRange *) palloc0(ncranges * sizeof(CombineRange));
- *nranges = ncranges;
/* put the new value at the beginning */
- cranges[0].minval = newvalue;
- cranges[0].maxval = newvalue;
- cranges[0].collapsed = true;
+ if (addvalue)
+ {
+ cranges[0].minval = newvalue;
+ cranges[0].maxval = newvalue;
+ cranges[0].collapsed = true;
- /* then the regular and collapsed ranges */
- fill_combine_ranges(&cranges[1], ncranges-1, ranges);
+ /* then the regular and collapsed ranges */
+ fill_combine_ranges(&cranges[1], ncranges-1, ranges);
+ }
+ else
+ fill_combine_ranges(cranges, ncranges, ranges);
/* and sort the ranges */
- sort_combine_ranges(cmp, colloid, cranges, ncranges);
+ ncranges = sort_combine_ranges(cmp, colloid, cranges, ncranges,
+ deduplicate);
+
+ /* remember how many cranges we built */
+ *nranges = ncranges;
return cranges;
}
@@ -1074,6 +1122,7 @@ count_values(CombineRange *cranges, int ncranges)
}
#endif
+
/*
* reduce_combine_ranges
* reduce the ranges until the number of values is low enough
@@ -1250,6 +1299,25 @@ range_add_value(BrinDesc *bdesc, Oid colloid,
Assert(2*ranges->nranges + ranges->nvalues <= ranges->maxvalues);
+ Assert((ranges->nranges >= 0) && (ranges->nvalues >= 0) && (ranges->maxvalues >= 0));
+
+ /*
+ * When batch-building, there should be no ranges. So either the
+ * number of ranges is 0 or we're not in batching mode.
+ */
+ Assert(!ranges->batch_mode || (ranges->nranges == 0));
+
+ /* When batch-building, just add it and we're done. */
+ if (ranges->batch_mode)
+ {
+ /* there has to be free space, if we've sized the struct */
+ Assert(ranges->nvalues < ranges->maxvalues);
+
+ ranges->values[ranges->nvalues++] = newval;
+
+ return true;
+ }
+
/*
* Bail out if the value already is covered by the range.
*
@@ -1322,7 +1390,9 @@ range_add_value(BrinDesc *bdesc, Oid colloid,
ranges->nvalues);
/* OK build the combine ranges */
- cranges = build_combine_ranges(cmpFn, colloid, ranges, newval, &ncranges);
+ cranges = build_combine_ranges(cmpFn, colloid, ranges,
+ true, newval, &ncranges,
+ false);
/* Reduce the ranges if needed */
if (ncranges > ranges->maxvalues)
@@ -1382,6 +1452,81 @@ range_add_value(BrinDesc *bdesc, Oid colloid,
return true;
}
+/*
+ * Generate range representation of data collected during "batch mode".
+ * This is similar to reduce_combine_ranges, except that we can't assume
+ * the values are sorted and there may be duplicate values.
+ */
+static void
+compactify_ranges(BrinDesc *bdesc, Ranges *ranges, int max_values)
+{
+ FmgrInfo *cmpFn,
+ *distanceFn;
+
+ /* combine ranges */
+ CombineRange *cranges;
+ int ncranges;
+ DistanceValue *distances;
+
+ MemoryContext ctx;
+ MemoryContext oldctx;
+
+ /*
+ * This should only be used in batch mode, and there should be no
+ * ranges, just individual values.
+ */
+ Assert((ranges->batch_mode) && (ranges->nranges == 0));
+
+ /* we'll certainly need the comparator, so just look it up now */
+ cmpFn = minmax_multi_get_strategy_procinfo(bdesc, ranges->attno, ranges->typid,
+ BTLessStrategyNumber);
+
+ /* and we'll also need the 'distance' procedure */
+ distanceFn = minmax_multi_get_procinfo(bdesc, ranges->attno, PROCNUM_DISTANCE);
+
+ /*
+ * The distanceFn calls (which may internally call e.g. numeric_le) may
+ * allocate quite a bit of memory, and we must not leak it. Otherwise
+ * we'd have problems e.g. when building indexes. So we create a local
+ * memory context and make sure we free the memory before leaving this
+ * function (not after every call).
+ */
+ ctx = AllocSetContextCreate(CurrentMemoryContext,
+ "minmax-multi context",
+ ALLOCSET_DEFAULT_SIZES);
+
+ oldctx = MemoryContextSwitchTo(ctx);
+
+ /* OK build the combine ranges */
+ cranges = build_combine_ranges(cmpFn, ranges->colloid, ranges,
+ false, (Datum) 0, &ncranges,
+ true); /* deduplicate */
+
+ /* build array of gap distances and sort them in ascending order */
+ distances = build_distances(distanceFn, ranges->colloid, cranges, ncranges);
+
+ /*
+ * Combine ranges until we get below max_values. We don't use any scale
+ * factor, because this is used at the very end of "batch mode" and we
+ * don't expect more tuples to be inserted soon.
+ */
+ ncranges = reduce_combine_ranges(cranges, ncranges, distances,
+ max_values, cmpFn, ranges->colloid);
+
+ Assert(count_values(cranges, ncranges) <= max_values);
+
+ /* decompose the combine ranges into regular ranges and single values */
+ store_combine_ranges(ranges, cranges, ncranges);
+
+ MemoryContextSwitchTo(oldctx);
+ MemoryContextDelete(ctx);
+
+ /* Check the ordering invariants are not violated (for both parts). */
+ AssertArrayOrder(cmpFn, ranges->colloid, ranges->values, ranges->nranges*2);
+ AssertArrayOrder(cmpFn, ranges->colloid, &ranges->values[ranges->nranges*2],
+ ranges->nvalues);
+}
+
Datum
brin_minmax_multi_opcinfo(PG_FUNCTION_ARGS)
{
@@ -1799,10 +1944,16 @@ brin_minmax_multi_distance_inet(PG_FUNCTION_ARGS)
}
static void
-brin_minmax_multi_serialize(Datum src, Datum *dst)
+brin_minmax_multi_serialize(BrinDesc *bdesc, Datum src, Datum *dst)
{
Ranges *ranges = (Ranges *) DatumGetPointer(src);
- SerializedRanges *s = range_serialize(ranges);
+ SerializedRanges *s;
+
+ /* In batch mode, we need to compress the accumulated values. */
+ if (ranges->batch_mode)
+ compactify_ranges(bdesc, ranges, ranges->target_maxvalues);
+
+ s = range_serialize(ranges);
dst[0] = PointerGetDatum(s);
}
@@ -1845,15 +1996,28 @@ brin_minmax_multi_add_value(PG_FUNCTION_ARGS)
/*
* If this is the first non-null value, we need to initialize the range
* list. Otherwise just extract the existing range list from BrinValues.
+ *
+ * When starting with an empty range, we assume this is a batch mode,
+ * i.e. we size the buffer for the maximum possible number of items in
+ * the range (based on range size and max number of items on a page).
+ *
+ * XXX This may require quite a bit of memory, so maybe we should use
+ * some value in between. OTOH most tables will have much wider rows,
+ * so the number of rows per page is much lower.
*/
if (column->bv_allnulls)
{
MemoryContext oldctx;
- oldctx = MemoryContextSwitchTo(column->bv_context);
+ BlockNumber pagesPerRange = BrinGetPagesPerRange(bdesc->bd_index);
- ranges = minmax_multi_init(brin_minmax_multi_get_values(bdesc, opts));
+ oldctx = MemoryContextSwitchTo(column->bv_context);
+ ranges = minmax_multi_init(MaxHeapTuplesPerPage * pagesPerRange);
+ ranges->attno = attno;
+ ranges->colloid = colloid;
ranges->typid = attr->atttypid;
+ ranges->batch_mode = true;
+ ranges->target_maxvalues = brin_minmax_multi_get_values(bdesc, opts);
MemoryContextSwitchTo(oldctx);
@@ -2125,7 +2289,7 @@ brin_minmax_multi_union(PG_FUNCTION_ARGS)
oldctx = MemoryContextSwitchTo(ctx);
/* allocate and fill */
- cranges = (CombineRange *)palloc0(ncranges * sizeof(CombineRange));
+ cranges = (CombineRange *) palloc0(ncranges * sizeof(CombineRange));
/* fill the combine ranges with entries for the first range */
fill_combine_ranges(cranges, ranges_a->nranges + ranges_a->nvalues,
@@ -2139,8 +2303,8 @@ brin_minmax_multi_union(PG_FUNCTION_ARGS)
cmpFn = minmax_multi_get_strategy_procinfo(bdesc, attno, attr->atttypid,
BTLessStrategyNumber);
- /* sort the combine ranges */
- sort_combine_ranges(cmpFn, colloid, cranges, ncranges);
+ /* sort the combine ranges (don't deduplicate) */
+ sort_combine_ranges(cmpFn, colloid, cranges, ncranges, false);
/*
* We've merged two different lists of ranges, so some of them may be
diff --git a/src/backend/access/brin/brin_tuple.c b/src/backend/access/brin/brin_tuple.c
index df820db029..bf8635d788 100644
--- a/src/backend/access/brin/brin_tuple.c
+++ b/src/backend/access/brin/brin_tuple.c
@@ -163,6 +163,7 @@ brin_form_tuple(BrinDesc *brdesc, BlockNumber blkno, BrinMemTuple *tuple,
if (tuple->bt_columns[keyno].bv_serialize)
{
tuple->bt_columns[keyno].bv_serialize(
+ brdesc,
tuple->bt_columns[keyno].bv_mem_value,
tuple->bt_columns[keyno].bv_values);
}
diff --git a/src/include/access/brin_tuple.h b/src/include/access/brin_tuple.h
index 66a6c3c792..e08998b71a 100644
--- a/src/include/access/brin_tuple.h
+++ b/src/include/access/brin_tuple.h
@@ -14,7 +14,7 @@
#include "access/brin_internal.h"
#include "access/tupdesc.h"
-typedef void (*brin_serialize_callback_type) (Datum src, Datum * dst);
+typedef void (*brin_serialize_callback_type) (BrinDesc *bdesc, Datum src, Datum * dst);
/*
* A BRIN index stores one index tuple per page range. Each index tuple
--
2.26.2
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--------------FA974B75A0C3E9CA18CE7207--
^ permalink raw reply [nested|flat] 29+ messages in thread
* [PATCH 8/8] batch build
@ 2021-01-22 00:11 Tomas Vondra <[email protected]>
0 siblings, 0 replies; 29+ messages in thread
From: Tomas Vondra @ 2021-01-22 00:11 UTC (permalink / raw)
---
src/backend/access/brin/brin_minmax_multi.c | 204 ++++++++++++++++++--
src/backend/access/brin/brin_tuple.c | 1 +
src/include/access/brin_tuple.h | 2 +-
3 files changed, 186 insertions(+), 21 deletions(-)
diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 094ecd2be9..72cca6f26b 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -57,6 +57,7 @@
#include "access/brin.h"
#include "access/brin_internal.h"
#include "access/brin_tuple.h"
+#include "access/hash.h" /* XXX strange that it fails because of BRIN_AM_OID without this */
#include "access/reloptions.h"
#include "access/stratnum.h"
#include "access/htup_details.h"
@@ -150,12 +151,23 @@ typedef struct MinMaxOptions
typedef struct Ranges
{
Oid typid;
+ Oid colloid;
+ AttrNumber attno;
/* (2*nranges + nvalues) <= maxvalues */
int nranges; /* number of ranges in the array (stored) */
int nvalues; /* number of values in the data array (all) */
int maxvalues; /* maximum number of values (reloption) */
+ /*
+ * Batch mode means we're simply appending values into new range,
+ * without any expensive steps (sorting, deduplication, ...). The
+ * buffer is sized to be much larger, but we keep the actual target
+ * size so that when serializing values we can do the right thing.
+ */
+ bool batch_mode;
+ int target_maxvalues;
+
/* values stored for this range - either raw values, or ranges */
Datum values[FLEXIBLE_ARRAY_MEMBER];
} Ranges;
@@ -375,6 +387,7 @@ range_deserialize(SerializedRanges *serialized)
range->nvalues = serialized->nvalues;
range->maxvalues = serialized->maxvalues;
range->typid = serialized->typid;
+ range->batch_mode = false;
typbyval = get_typbyval(serialized->typid);
typlen = get_typlen(serialized->typid);
@@ -844,11 +857,14 @@ fill_combine_ranges(CombineRange *cranges, int ncranges, Ranges *ranges)
/*
* Sort combine ranges using qsort (with BTLessStrategyNumber function).
*/
-static void
+static int
sort_combine_ranges(FmgrInfo *cmp, Oid colloid,
- CombineRange *cranges, int ncranges)
+ CombineRange *cranges, int ncranges,
+ bool deduplicate)
{
- compare_context cxt;
+ int n;
+ int i;
+ compare_context cxt;
/* sort the values */
cxt.colloid = colloid;
@@ -856,6 +872,24 @@ sort_combine_ranges(FmgrInfo *cmp, Oid colloid,
qsort_arg(cranges, ncranges, sizeof(CombineRange),
compare_combine_ranges, (void *) &cxt);
+
+ if (!deduplicate)
+ return ncranges;
+
+ /* optionally deduplicate the ranges */
+ n = 1;
+ for (i = 1; i < ncranges; i++)
+ {
+ if (compare_combine_ranges(&cranges[i-1], &cranges[i], (void *) &cxt))
+ {
+ if (i != n)
+ memcpy(&cranges[n], &cranges[i], sizeof(CombineRange));
+
+ n++;
+ }
+ }
+
+ return n;
}
/*
@@ -1026,26 +1060,40 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
*/
static CombineRange *
build_combine_ranges(FmgrInfo *cmp, Oid colloid, Ranges *ranges,
- Datum newvalue, int *nranges)
+ bool addvalue, Datum newvalue, int *nranges,
+ bool deduplicate)
{
int ncranges;
CombineRange *cranges;
/* now do the actual merge sort */
- ncranges = ranges->nranges + ranges->nvalues + 1;
+ ncranges = ranges->nranges + ranges->nvalues;
+
+ /* should we add an extra value? */
+ if (addvalue)
+ ncranges += 1;
+
cranges = (CombineRange *) palloc0(ncranges * sizeof(CombineRange));
- *nranges = ncranges;
/* put the new value at the beginning */
- cranges[0].minval = newvalue;
- cranges[0].maxval = newvalue;
- cranges[0].collapsed = true;
+ if (addvalue)
+ {
+ cranges[0].minval = newvalue;
+ cranges[0].maxval = newvalue;
+ cranges[0].collapsed = true;
- /* then the regular and collapsed ranges */
- fill_combine_ranges(&cranges[1], ncranges-1, ranges);
+ /* then the regular and collapsed ranges */
+ fill_combine_ranges(&cranges[1], ncranges-1, ranges);
+ }
+ else
+ fill_combine_ranges(cranges, ncranges, ranges);
/* and sort the ranges */
- sort_combine_ranges(cmp, colloid, cranges, ncranges);
+ ncranges = sort_combine_ranges(cmp, colloid, cranges, ncranges,
+ deduplicate);
+
+ /* remember how many cranges we built */
+ *nranges = ncranges;
return cranges;
}
@@ -1074,6 +1122,7 @@ count_values(CombineRange *cranges, int ncranges)
}
#endif
+
/*
* reduce_combine_ranges
* reduce the ranges until the number of values is low enough
@@ -1250,6 +1299,25 @@ range_add_value(BrinDesc *bdesc, Oid colloid,
Assert(2*ranges->nranges + ranges->nvalues <= ranges->maxvalues);
+ Assert((ranges->nranges >= 0) && (ranges->nvalues >= 0) && (ranges->maxvalues >= 0));
+
+ /*
+ * When batch-building, there should be no ranges. So either the
+ * number of ranges is 0 or we're not in batching mode.
+ */
+ Assert(!ranges->batch_mode || (ranges->nranges == 0));
+
+ /* When batch-building, just add it and we're done. */
+ if (ranges->batch_mode)
+ {
+ /* there has to be free space, if we've sized the struct */
+ Assert(ranges->nvalues < ranges->maxvalues);
+
+ ranges->values[ranges->nvalues++] = newval;
+
+ return true;
+ }
+
/*
* Bail out if the value already is covered by the range.
*
@@ -1322,7 +1390,9 @@ range_add_value(BrinDesc *bdesc, Oid colloid,
ranges->nvalues);
/* OK build the combine ranges */
- cranges = build_combine_ranges(cmpFn, colloid, ranges, newval, &ncranges);
+ cranges = build_combine_ranges(cmpFn, colloid, ranges,
+ true, newval, &ncranges,
+ false);
/* Reduce the ranges if needed */
if (ncranges > ranges->maxvalues)
@@ -1382,6 +1452,81 @@ range_add_value(BrinDesc *bdesc, Oid colloid,
return true;
}
+/*
+ * Generate range representation of data collected during "batch mode".
+ * This is similar to reduce_combine_ranges, except that we can't assume
+ * the values are sorted and there may be duplicate values.
+ */
+static void
+compactify_ranges(BrinDesc *bdesc, Ranges *ranges, int max_values)
+{
+ FmgrInfo *cmpFn,
+ *distanceFn;
+
+ /* combine ranges */
+ CombineRange *cranges;
+ int ncranges;
+ DistanceValue *distances;
+
+ MemoryContext ctx;
+ MemoryContext oldctx;
+
+ /*
+ * This should only be used in batch mode, and there should be no
+ * ranges, just individual values.
+ */
+ Assert((ranges->batch_mode) && (ranges->nranges == 0));
+
+ /* we'll certainly need the comparator, so just look it up now */
+ cmpFn = minmax_multi_get_strategy_procinfo(bdesc, ranges->attno, ranges->typid,
+ BTLessStrategyNumber);
+
+ /* and we'll also need the 'distance' procedure */
+ distanceFn = minmax_multi_get_procinfo(bdesc, ranges->attno, PROCNUM_DISTANCE);
+
+ /*
+ * The distanceFn calls (which may internally call e.g. numeric_le) may
+ * allocate quite a bit of memory, and we must not leak it. Otherwise
+ * we'd have problems e.g. when building indexes. So we create a local
+ * memory context and make sure we free the memory before leaving this
+ * function (not after every call).
+ */
+ ctx = AllocSetContextCreate(CurrentMemoryContext,
+ "minmax-multi context",
+ ALLOCSET_DEFAULT_SIZES);
+
+ oldctx = MemoryContextSwitchTo(ctx);
+
+ /* OK build the combine ranges */
+ cranges = build_combine_ranges(cmpFn, ranges->colloid, ranges,
+ false, (Datum) 0, &ncranges,
+ true); /* deduplicate */
+
+ /* build array of gap distances and sort them in ascending order */
+ distances = build_distances(distanceFn, ranges->colloid, cranges, ncranges);
+
+ /*
+ * Combine ranges until we get below max_values. We don't use any scale
+ * factor, because this is used at the very end of "batch mode" and we
+ * don't expect more tuples to be inserted soon.
+ */
+ ncranges = reduce_combine_ranges(cranges, ncranges, distances,
+ max_values, cmpFn, ranges->colloid);
+
+ Assert(count_values(cranges, ncranges) <= max_values);
+
+ /* decompose the combine ranges into regular ranges and single values */
+ store_combine_ranges(ranges, cranges, ncranges);
+
+ MemoryContextSwitchTo(oldctx);
+ MemoryContextDelete(ctx);
+
+ /* Check the ordering invariants are not violated (for both parts). */
+ AssertArrayOrder(cmpFn, ranges->colloid, ranges->values, ranges->nranges*2);
+ AssertArrayOrder(cmpFn, ranges->colloid, &ranges->values[ranges->nranges*2],
+ ranges->nvalues);
+}
+
Datum
brin_minmax_multi_opcinfo(PG_FUNCTION_ARGS)
{
@@ -1799,10 +1944,16 @@ brin_minmax_multi_distance_inet(PG_FUNCTION_ARGS)
}
static void
-brin_minmax_multi_serialize(Datum src, Datum *dst)
+brin_minmax_multi_serialize(BrinDesc *bdesc, Datum src, Datum *dst)
{
Ranges *ranges = (Ranges *) DatumGetPointer(src);
- SerializedRanges *s = range_serialize(ranges);
+ SerializedRanges *s;
+
+ /* In batch mode, we need to compress the accumulated values. */
+ if (ranges->batch_mode)
+ compactify_ranges(bdesc, ranges, ranges->target_maxvalues);
+
+ s = range_serialize(ranges);
dst[0] = PointerGetDatum(s);
}
@@ -1845,15 +1996,28 @@ brin_minmax_multi_add_value(PG_FUNCTION_ARGS)
/*
* If this is the first non-null value, we need to initialize the range
* list. Otherwise just extract the existing range list from BrinValues.
+ *
+ * When starting with an empty range, we assume this is a batch mode,
+ * i.e. we size the buffer for the maximum possible number of items in
+ * the range (based on range size and max number of items on a page).
+ *
+ * XXX This may require quite a bit of memory, so maybe we should use
+ * some value in between. OTOH most tables will have much wider rows,
+ * so the number of rows per page is much lower.
*/
if (column->bv_allnulls)
{
MemoryContext oldctx;
- oldctx = MemoryContextSwitchTo(column->bv_context);
+ BlockNumber pagesPerRange = BrinGetPagesPerRange(bdesc->bd_index);
- ranges = minmax_multi_init(brin_minmax_multi_get_values(bdesc, opts));
+ oldctx = MemoryContextSwitchTo(column->bv_context);
+ ranges = minmax_multi_init(MaxHeapTuplesPerPage * pagesPerRange);
+ ranges->attno = attno;
+ ranges->colloid = colloid;
ranges->typid = attr->atttypid;
+ ranges->batch_mode = true;
+ ranges->target_maxvalues = brin_minmax_multi_get_values(bdesc, opts);
MemoryContextSwitchTo(oldctx);
@@ -2125,7 +2289,7 @@ brin_minmax_multi_union(PG_FUNCTION_ARGS)
oldctx = MemoryContextSwitchTo(ctx);
/* allocate and fill */
- cranges = (CombineRange *)palloc0(ncranges * sizeof(CombineRange));
+ cranges = (CombineRange *) palloc0(ncranges * sizeof(CombineRange));
/* fill the combine ranges with entries for the first range */
fill_combine_ranges(cranges, ranges_a->nranges + ranges_a->nvalues,
@@ -2139,8 +2303,8 @@ brin_minmax_multi_union(PG_FUNCTION_ARGS)
cmpFn = minmax_multi_get_strategy_procinfo(bdesc, attno, attr->atttypid,
BTLessStrategyNumber);
- /* sort the combine ranges */
- sort_combine_ranges(cmpFn, colloid, cranges, ncranges);
+ /* sort the combine ranges (don't deduplicate) */
+ sort_combine_ranges(cmpFn, colloid, cranges, ncranges, false);
/*
* We've merged two different lists of ranges, so some of them may be
diff --git a/src/backend/access/brin/brin_tuple.c b/src/backend/access/brin/brin_tuple.c
index df820db029..bf8635d788 100644
--- a/src/backend/access/brin/brin_tuple.c
+++ b/src/backend/access/brin/brin_tuple.c
@@ -163,6 +163,7 @@ brin_form_tuple(BrinDesc *brdesc, BlockNumber blkno, BrinMemTuple *tuple,
if (tuple->bt_columns[keyno].bv_serialize)
{
tuple->bt_columns[keyno].bv_serialize(
+ brdesc,
tuple->bt_columns[keyno].bv_mem_value,
tuple->bt_columns[keyno].bv_values);
}
diff --git a/src/include/access/brin_tuple.h b/src/include/access/brin_tuple.h
index 66a6c3c792..e08998b71a 100644
--- a/src/include/access/brin_tuple.h
+++ b/src/include/access/brin_tuple.h
@@ -14,7 +14,7 @@
#include "access/brin_internal.h"
#include "access/tupdesc.h"
-typedef void (*brin_serialize_callback_type) (Datum src, Datum * dst);
+typedef void (*brin_serialize_callback_type) (BrinDesc *bdesc, Datum src, Datum * dst);
/*
* A BRIN index stores one index tuple per page range. Each index tuple
--
2.26.2
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--------------FA974B75A0C3E9CA18CE7207--
^ permalink raw reply [nested|flat] 29+ messages in thread
* [PATCH 8/8] batch build
@ 2021-01-22 00:11 Tomas Vondra <[email protected]>
0 siblings, 0 replies; 29+ messages in thread
From: Tomas Vondra @ 2021-01-22 00:11 UTC (permalink / raw)
---
src/backend/access/brin/brin_minmax_multi.c | 204 ++++++++++++++++++--
src/backend/access/brin/brin_tuple.c | 1 +
src/include/access/brin_tuple.h | 2 +-
3 files changed, 186 insertions(+), 21 deletions(-)
diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 094ecd2be9..72cca6f26b 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -57,6 +57,7 @@
#include "access/brin.h"
#include "access/brin_internal.h"
#include "access/brin_tuple.h"
+#include "access/hash.h" /* XXX strange that it fails because of BRIN_AM_OID without this */
#include "access/reloptions.h"
#include "access/stratnum.h"
#include "access/htup_details.h"
@@ -150,12 +151,23 @@ typedef struct MinMaxOptions
typedef struct Ranges
{
Oid typid;
+ Oid colloid;
+ AttrNumber attno;
/* (2*nranges + nvalues) <= maxvalues */
int nranges; /* number of ranges in the array (stored) */
int nvalues; /* number of values in the data array (all) */
int maxvalues; /* maximum number of values (reloption) */
+ /*
+ * Batch mode means we're simply appending values into new range,
+ * without any expensive steps (sorting, deduplication, ...). The
+ * buffer is sized to be much larger, but we keep the actual target
+ * size so that when serializing values we can do the right thing.
+ */
+ bool batch_mode;
+ int target_maxvalues;
+
/* values stored for this range - either raw values, or ranges */
Datum values[FLEXIBLE_ARRAY_MEMBER];
} Ranges;
@@ -375,6 +387,7 @@ range_deserialize(SerializedRanges *serialized)
range->nvalues = serialized->nvalues;
range->maxvalues = serialized->maxvalues;
range->typid = serialized->typid;
+ range->batch_mode = false;
typbyval = get_typbyval(serialized->typid);
typlen = get_typlen(serialized->typid);
@@ -844,11 +857,14 @@ fill_combine_ranges(CombineRange *cranges, int ncranges, Ranges *ranges)
/*
* Sort combine ranges using qsort (with BTLessStrategyNumber function).
*/
-static void
+static int
sort_combine_ranges(FmgrInfo *cmp, Oid colloid,
- CombineRange *cranges, int ncranges)
+ CombineRange *cranges, int ncranges,
+ bool deduplicate)
{
- compare_context cxt;
+ int n;
+ int i;
+ compare_context cxt;
/* sort the values */
cxt.colloid = colloid;
@@ -856,6 +872,24 @@ sort_combine_ranges(FmgrInfo *cmp, Oid colloid,
qsort_arg(cranges, ncranges, sizeof(CombineRange),
compare_combine_ranges, (void *) &cxt);
+
+ if (!deduplicate)
+ return ncranges;
+
+ /* optionally deduplicate the ranges */
+ n = 1;
+ for (i = 1; i < ncranges; i++)
+ {
+ if (compare_combine_ranges(&cranges[i-1], &cranges[i], (void *) &cxt))
+ {
+ if (i != n)
+ memcpy(&cranges[n], &cranges[i], sizeof(CombineRange));
+
+ n++;
+ }
+ }
+
+ return n;
}
/*
@@ -1026,26 +1060,40 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
*/
static CombineRange *
build_combine_ranges(FmgrInfo *cmp, Oid colloid, Ranges *ranges,
- Datum newvalue, int *nranges)
+ bool addvalue, Datum newvalue, int *nranges,
+ bool deduplicate)
{
int ncranges;
CombineRange *cranges;
/* now do the actual merge sort */
- ncranges = ranges->nranges + ranges->nvalues + 1;
+ ncranges = ranges->nranges + ranges->nvalues;
+
+ /* should we add an extra value? */
+ if (addvalue)
+ ncranges += 1;
+
cranges = (CombineRange *) palloc0(ncranges * sizeof(CombineRange));
- *nranges = ncranges;
/* put the new value at the beginning */
- cranges[0].minval = newvalue;
- cranges[0].maxval = newvalue;
- cranges[0].collapsed = true;
+ if (addvalue)
+ {
+ cranges[0].minval = newvalue;
+ cranges[0].maxval = newvalue;
+ cranges[0].collapsed = true;
- /* then the regular and collapsed ranges */
- fill_combine_ranges(&cranges[1], ncranges-1, ranges);
+ /* then the regular and collapsed ranges */
+ fill_combine_ranges(&cranges[1], ncranges-1, ranges);
+ }
+ else
+ fill_combine_ranges(cranges, ncranges, ranges);
/* and sort the ranges */
- sort_combine_ranges(cmp, colloid, cranges, ncranges);
+ ncranges = sort_combine_ranges(cmp, colloid, cranges, ncranges,
+ deduplicate);
+
+ /* remember how many cranges we built */
+ *nranges = ncranges;
return cranges;
}
@@ -1074,6 +1122,7 @@ count_values(CombineRange *cranges, int ncranges)
}
#endif
+
/*
* reduce_combine_ranges
* reduce the ranges until the number of values is low enough
@@ -1250,6 +1299,25 @@ range_add_value(BrinDesc *bdesc, Oid colloid,
Assert(2*ranges->nranges + ranges->nvalues <= ranges->maxvalues);
+ Assert((ranges->nranges >= 0) && (ranges->nvalues >= 0) && (ranges->maxvalues >= 0));
+
+ /*
+ * When batch-building, there should be no ranges. So either the
+ * number of ranges is 0 or we're not in batching mode.
+ */
+ Assert(!ranges->batch_mode || (ranges->nranges == 0));
+
+ /* When batch-building, just add it and we're done. */
+ if (ranges->batch_mode)
+ {
+ /* there has to be free space, if we've sized the struct */
+ Assert(ranges->nvalues < ranges->maxvalues);
+
+ ranges->values[ranges->nvalues++] = newval;
+
+ return true;
+ }
+
/*
* Bail out if the value already is covered by the range.
*
@@ -1322,7 +1390,9 @@ range_add_value(BrinDesc *bdesc, Oid colloid,
ranges->nvalues);
/* OK build the combine ranges */
- cranges = build_combine_ranges(cmpFn, colloid, ranges, newval, &ncranges);
+ cranges = build_combine_ranges(cmpFn, colloid, ranges,
+ true, newval, &ncranges,
+ false);
/* Reduce the ranges if needed */
if (ncranges > ranges->maxvalues)
@@ -1382,6 +1452,81 @@ range_add_value(BrinDesc *bdesc, Oid colloid,
return true;
}
+/*
+ * Generate range representation of data collected during "batch mode".
+ * This is similar to reduce_combine_ranges, except that we can't assume
+ * the values are sorted and there may be duplicate values.
+ */
+static void
+compactify_ranges(BrinDesc *bdesc, Ranges *ranges, int max_values)
+{
+ FmgrInfo *cmpFn,
+ *distanceFn;
+
+ /* combine ranges */
+ CombineRange *cranges;
+ int ncranges;
+ DistanceValue *distances;
+
+ MemoryContext ctx;
+ MemoryContext oldctx;
+
+ /*
+ * This should only be used in batch mode, and there should be no
+ * ranges, just individual values.
+ */
+ Assert((ranges->batch_mode) && (ranges->nranges == 0));
+
+ /* we'll certainly need the comparator, so just look it up now */
+ cmpFn = minmax_multi_get_strategy_procinfo(bdesc, ranges->attno, ranges->typid,
+ BTLessStrategyNumber);
+
+ /* and we'll also need the 'distance' procedure */
+ distanceFn = minmax_multi_get_procinfo(bdesc, ranges->attno, PROCNUM_DISTANCE);
+
+ /*
+ * The distanceFn calls (which may internally call e.g. numeric_le) may
+ * allocate quite a bit of memory, and we must not leak it. Otherwise
+ * we'd have problems e.g. when building indexes. So we create a local
+ * memory context and make sure we free the memory before leaving this
+ * function (not after every call).
+ */
+ ctx = AllocSetContextCreate(CurrentMemoryContext,
+ "minmax-multi context",
+ ALLOCSET_DEFAULT_SIZES);
+
+ oldctx = MemoryContextSwitchTo(ctx);
+
+ /* OK build the combine ranges */
+ cranges = build_combine_ranges(cmpFn, ranges->colloid, ranges,
+ false, (Datum) 0, &ncranges,
+ true); /* deduplicate */
+
+ /* build array of gap distances and sort them in ascending order */
+ distances = build_distances(distanceFn, ranges->colloid, cranges, ncranges);
+
+ /*
+ * Combine ranges until we get below max_values. We don't use any scale
+ * factor, because this is used at the very end of "batch mode" and we
+ * don't expect more tuples to be inserted soon.
+ */
+ ncranges = reduce_combine_ranges(cranges, ncranges, distances,
+ max_values, cmpFn, ranges->colloid);
+
+ Assert(count_values(cranges, ncranges) <= max_values);
+
+ /* decompose the combine ranges into regular ranges and single values */
+ store_combine_ranges(ranges, cranges, ncranges);
+
+ MemoryContextSwitchTo(oldctx);
+ MemoryContextDelete(ctx);
+
+ /* Check the ordering invariants are not violated (for both parts). */
+ AssertArrayOrder(cmpFn, ranges->colloid, ranges->values, ranges->nranges*2);
+ AssertArrayOrder(cmpFn, ranges->colloid, &ranges->values[ranges->nranges*2],
+ ranges->nvalues);
+}
+
Datum
brin_minmax_multi_opcinfo(PG_FUNCTION_ARGS)
{
@@ -1799,10 +1944,16 @@ brin_minmax_multi_distance_inet(PG_FUNCTION_ARGS)
}
static void
-brin_minmax_multi_serialize(Datum src, Datum *dst)
+brin_minmax_multi_serialize(BrinDesc *bdesc, Datum src, Datum *dst)
{
Ranges *ranges = (Ranges *) DatumGetPointer(src);
- SerializedRanges *s = range_serialize(ranges);
+ SerializedRanges *s;
+
+ /* In batch mode, we need to compress the accumulated values. */
+ if (ranges->batch_mode)
+ compactify_ranges(bdesc, ranges, ranges->target_maxvalues);
+
+ s = range_serialize(ranges);
dst[0] = PointerGetDatum(s);
}
@@ -1845,15 +1996,28 @@ brin_minmax_multi_add_value(PG_FUNCTION_ARGS)
/*
* If this is the first non-null value, we need to initialize the range
* list. Otherwise just extract the existing range list from BrinValues.
+ *
+ * When starting with an empty range, we assume this is a batch mode,
+ * i.e. we size the buffer for the maximum possible number of items in
+ * the range (based on range size and max number of items on a page).
+ *
+ * XXX This may require quite a bit of memory, so maybe we should use
+ * some value in between. OTOH most tables will have much wider rows,
+ * so the number of rows per page is much lower.
*/
if (column->bv_allnulls)
{
MemoryContext oldctx;
- oldctx = MemoryContextSwitchTo(column->bv_context);
+ BlockNumber pagesPerRange = BrinGetPagesPerRange(bdesc->bd_index);
- ranges = minmax_multi_init(brin_minmax_multi_get_values(bdesc, opts));
+ oldctx = MemoryContextSwitchTo(column->bv_context);
+ ranges = minmax_multi_init(MaxHeapTuplesPerPage * pagesPerRange);
+ ranges->attno = attno;
+ ranges->colloid = colloid;
ranges->typid = attr->atttypid;
+ ranges->batch_mode = true;
+ ranges->target_maxvalues = brin_minmax_multi_get_values(bdesc, opts);
MemoryContextSwitchTo(oldctx);
@@ -2125,7 +2289,7 @@ brin_minmax_multi_union(PG_FUNCTION_ARGS)
oldctx = MemoryContextSwitchTo(ctx);
/* allocate and fill */
- cranges = (CombineRange *)palloc0(ncranges * sizeof(CombineRange));
+ cranges = (CombineRange *) palloc0(ncranges * sizeof(CombineRange));
/* fill the combine ranges with entries for the first range */
fill_combine_ranges(cranges, ranges_a->nranges + ranges_a->nvalues,
@@ -2139,8 +2303,8 @@ brin_minmax_multi_union(PG_FUNCTION_ARGS)
cmpFn = minmax_multi_get_strategy_procinfo(bdesc, attno, attr->atttypid,
BTLessStrategyNumber);
- /* sort the combine ranges */
- sort_combine_ranges(cmpFn, colloid, cranges, ncranges);
+ /* sort the combine ranges (don't deduplicate) */
+ sort_combine_ranges(cmpFn, colloid, cranges, ncranges, false);
/*
* We've merged two different lists of ranges, so some of them may be
diff --git a/src/backend/access/brin/brin_tuple.c b/src/backend/access/brin/brin_tuple.c
index df820db029..bf8635d788 100644
--- a/src/backend/access/brin/brin_tuple.c
+++ b/src/backend/access/brin/brin_tuple.c
@@ -163,6 +163,7 @@ brin_form_tuple(BrinDesc *brdesc, BlockNumber blkno, BrinMemTuple *tuple,
if (tuple->bt_columns[keyno].bv_serialize)
{
tuple->bt_columns[keyno].bv_serialize(
+ brdesc,
tuple->bt_columns[keyno].bv_mem_value,
tuple->bt_columns[keyno].bv_values);
}
diff --git a/src/include/access/brin_tuple.h b/src/include/access/brin_tuple.h
index 66a6c3c792..e08998b71a 100644
--- a/src/include/access/brin_tuple.h
+++ b/src/include/access/brin_tuple.h
@@ -14,7 +14,7 @@
#include "access/brin_internal.h"
#include "access/tupdesc.h"
-typedef void (*brin_serialize_callback_type) (Datum src, Datum * dst);
+typedef void (*brin_serialize_callback_type) (BrinDesc *bdesc, Datum src, Datum * dst);
/*
* A BRIN index stores one index tuple per page range. Each index tuple
--
2.26.2
--------------FA974B75A0C3E9CA18CE7207
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--------------FA974B75A0C3E9CA18CE7207--
^ permalink raw reply [nested|flat] 29+ messages in thread
* [PATCH 8/8] batch build
@ 2021-01-22 00:11 Tomas Vondra <[email protected]>
0 siblings, 0 replies; 29+ messages in thread
From: Tomas Vondra @ 2021-01-22 00:11 UTC (permalink / raw)
---
src/backend/access/brin/brin_minmax_multi.c | 204 ++++++++++++++++++--
src/backend/access/brin/brin_tuple.c | 1 +
src/include/access/brin_tuple.h | 2 +-
3 files changed, 186 insertions(+), 21 deletions(-)
diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 094ecd2be9..72cca6f26b 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -57,6 +57,7 @@
#include "access/brin.h"
#include "access/brin_internal.h"
#include "access/brin_tuple.h"
+#include "access/hash.h" /* XXX strange that it fails because of BRIN_AM_OID without this */
#include "access/reloptions.h"
#include "access/stratnum.h"
#include "access/htup_details.h"
@@ -150,12 +151,23 @@ typedef struct MinMaxOptions
typedef struct Ranges
{
Oid typid;
+ Oid colloid;
+ AttrNumber attno;
/* (2*nranges + nvalues) <= maxvalues */
int nranges; /* number of ranges in the array (stored) */
int nvalues; /* number of values in the data array (all) */
int maxvalues; /* maximum number of values (reloption) */
+ /*
+ * Batch mode means we're simply appending values into new range,
+ * without any expensive steps (sorting, deduplication, ...). The
+ * buffer is sized to be much larger, but we keep the actual target
+ * size so that when serializing values we can do the right thing.
+ */
+ bool batch_mode;
+ int target_maxvalues;
+
/* values stored for this range - either raw values, or ranges */
Datum values[FLEXIBLE_ARRAY_MEMBER];
} Ranges;
@@ -375,6 +387,7 @@ range_deserialize(SerializedRanges *serialized)
range->nvalues = serialized->nvalues;
range->maxvalues = serialized->maxvalues;
range->typid = serialized->typid;
+ range->batch_mode = false;
typbyval = get_typbyval(serialized->typid);
typlen = get_typlen(serialized->typid);
@@ -844,11 +857,14 @@ fill_combine_ranges(CombineRange *cranges, int ncranges, Ranges *ranges)
/*
* Sort combine ranges using qsort (with BTLessStrategyNumber function).
*/
-static void
+static int
sort_combine_ranges(FmgrInfo *cmp, Oid colloid,
- CombineRange *cranges, int ncranges)
+ CombineRange *cranges, int ncranges,
+ bool deduplicate)
{
- compare_context cxt;
+ int n;
+ int i;
+ compare_context cxt;
/* sort the values */
cxt.colloid = colloid;
@@ -856,6 +872,24 @@ sort_combine_ranges(FmgrInfo *cmp, Oid colloid,
qsort_arg(cranges, ncranges, sizeof(CombineRange),
compare_combine_ranges, (void *) &cxt);
+
+ if (!deduplicate)
+ return ncranges;
+
+ /* optionally deduplicate the ranges */
+ n = 1;
+ for (i = 1; i < ncranges; i++)
+ {
+ if (compare_combine_ranges(&cranges[i-1], &cranges[i], (void *) &cxt))
+ {
+ if (i != n)
+ memcpy(&cranges[n], &cranges[i], sizeof(CombineRange));
+
+ n++;
+ }
+ }
+
+ return n;
}
/*
@@ -1026,26 +1060,40 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
*/
static CombineRange *
build_combine_ranges(FmgrInfo *cmp, Oid colloid, Ranges *ranges,
- Datum newvalue, int *nranges)
+ bool addvalue, Datum newvalue, int *nranges,
+ bool deduplicate)
{
int ncranges;
CombineRange *cranges;
/* now do the actual merge sort */
- ncranges = ranges->nranges + ranges->nvalues + 1;
+ ncranges = ranges->nranges + ranges->nvalues;
+
+ /* should we add an extra value? */
+ if (addvalue)
+ ncranges += 1;
+
cranges = (CombineRange *) palloc0(ncranges * sizeof(CombineRange));
- *nranges = ncranges;
/* put the new value at the beginning */
- cranges[0].minval = newvalue;
- cranges[0].maxval = newvalue;
- cranges[0].collapsed = true;
+ if (addvalue)
+ {
+ cranges[0].minval = newvalue;
+ cranges[0].maxval = newvalue;
+ cranges[0].collapsed = true;
- /* then the regular and collapsed ranges */
- fill_combine_ranges(&cranges[1], ncranges-1, ranges);
+ /* then the regular and collapsed ranges */
+ fill_combine_ranges(&cranges[1], ncranges-1, ranges);
+ }
+ else
+ fill_combine_ranges(cranges, ncranges, ranges);
/* and sort the ranges */
- sort_combine_ranges(cmp, colloid, cranges, ncranges);
+ ncranges = sort_combine_ranges(cmp, colloid, cranges, ncranges,
+ deduplicate);
+
+ /* remember how many cranges we built */
+ *nranges = ncranges;
return cranges;
}
@@ -1074,6 +1122,7 @@ count_values(CombineRange *cranges, int ncranges)
}
#endif
+
/*
* reduce_combine_ranges
* reduce the ranges until the number of values is low enough
@@ -1250,6 +1299,25 @@ range_add_value(BrinDesc *bdesc, Oid colloid,
Assert(2*ranges->nranges + ranges->nvalues <= ranges->maxvalues);
+ Assert((ranges->nranges >= 0) && (ranges->nvalues >= 0) && (ranges->maxvalues >= 0));
+
+ /*
+ * When batch-building, there should be no ranges. So either the
+ * number of ranges is 0 or we're not in batching mode.
+ */
+ Assert(!ranges->batch_mode || (ranges->nranges == 0));
+
+ /* When batch-building, just add it and we're done. */
+ if (ranges->batch_mode)
+ {
+ /* there has to be free space, if we've sized the struct */
+ Assert(ranges->nvalues < ranges->maxvalues);
+
+ ranges->values[ranges->nvalues++] = newval;
+
+ return true;
+ }
+
/*
* Bail out if the value already is covered by the range.
*
@@ -1322,7 +1390,9 @@ range_add_value(BrinDesc *bdesc, Oid colloid,
ranges->nvalues);
/* OK build the combine ranges */
- cranges = build_combine_ranges(cmpFn, colloid, ranges, newval, &ncranges);
+ cranges = build_combine_ranges(cmpFn, colloid, ranges,
+ true, newval, &ncranges,
+ false);
/* Reduce the ranges if needed */
if (ncranges > ranges->maxvalues)
@@ -1382,6 +1452,81 @@ range_add_value(BrinDesc *bdesc, Oid colloid,
return true;
}
+/*
+ * Generate range representation of data collected during "batch mode".
+ * This is similar to reduce_combine_ranges, except that we can't assume
+ * the values are sorted and there may be duplicate values.
+ */
+static void
+compactify_ranges(BrinDesc *bdesc, Ranges *ranges, int max_values)
+{
+ FmgrInfo *cmpFn,
+ *distanceFn;
+
+ /* combine ranges */
+ CombineRange *cranges;
+ int ncranges;
+ DistanceValue *distances;
+
+ MemoryContext ctx;
+ MemoryContext oldctx;
+
+ /*
+ * This should only be used in batch mode, and there should be no
+ * ranges, just individual values.
+ */
+ Assert((ranges->batch_mode) && (ranges->nranges == 0));
+
+ /* we'll certainly need the comparator, so just look it up now */
+ cmpFn = minmax_multi_get_strategy_procinfo(bdesc, ranges->attno, ranges->typid,
+ BTLessStrategyNumber);
+
+ /* and we'll also need the 'distance' procedure */
+ distanceFn = minmax_multi_get_procinfo(bdesc, ranges->attno, PROCNUM_DISTANCE);
+
+ /*
+ * The distanceFn calls (which may internally call e.g. numeric_le) may
+ * allocate quite a bit of memory, and we must not leak it. Otherwise
+ * we'd have problems e.g. when building indexes. So we create a local
+ * memory context and make sure we free the memory before leaving this
+ * function (not after every call).
+ */
+ ctx = AllocSetContextCreate(CurrentMemoryContext,
+ "minmax-multi context",
+ ALLOCSET_DEFAULT_SIZES);
+
+ oldctx = MemoryContextSwitchTo(ctx);
+
+ /* OK build the combine ranges */
+ cranges = build_combine_ranges(cmpFn, ranges->colloid, ranges,
+ false, (Datum) 0, &ncranges,
+ true); /* deduplicate */
+
+ /* build array of gap distances and sort them in ascending order */
+ distances = build_distances(distanceFn, ranges->colloid, cranges, ncranges);
+
+ /*
+ * Combine ranges until we get below max_values. We don't use any scale
+ * factor, because this is used at the very end of "batch mode" and we
+ * don't expect more tuples to be inserted soon.
+ */
+ ncranges = reduce_combine_ranges(cranges, ncranges, distances,
+ max_values, cmpFn, ranges->colloid);
+
+ Assert(count_values(cranges, ncranges) <= max_values);
+
+ /* decompose the combine ranges into regular ranges and single values */
+ store_combine_ranges(ranges, cranges, ncranges);
+
+ MemoryContextSwitchTo(oldctx);
+ MemoryContextDelete(ctx);
+
+ /* Check the ordering invariants are not violated (for both parts). */
+ AssertArrayOrder(cmpFn, ranges->colloid, ranges->values, ranges->nranges*2);
+ AssertArrayOrder(cmpFn, ranges->colloid, &ranges->values[ranges->nranges*2],
+ ranges->nvalues);
+}
+
Datum
brin_minmax_multi_opcinfo(PG_FUNCTION_ARGS)
{
@@ -1799,10 +1944,16 @@ brin_minmax_multi_distance_inet(PG_FUNCTION_ARGS)
}
static void
-brin_minmax_multi_serialize(Datum src, Datum *dst)
+brin_minmax_multi_serialize(BrinDesc *bdesc, Datum src, Datum *dst)
{
Ranges *ranges = (Ranges *) DatumGetPointer(src);
- SerializedRanges *s = range_serialize(ranges);
+ SerializedRanges *s;
+
+ /* In batch mode, we need to compress the accumulated values. */
+ if (ranges->batch_mode)
+ compactify_ranges(bdesc, ranges, ranges->target_maxvalues);
+
+ s = range_serialize(ranges);
dst[0] = PointerGetDatum(s);
}
@@ -1845,15 +1996,28 @@ brin_minmax_multi_add_value(PG_FUNCTION_ARGS)
/*
* If this is the first non-null value, we need to initialize the range
* list. Otherwise just extract the existing range list from BrinValues.
+ *
+ * When starting with an empty range, we assume this is a batch mode,
+ * i.e. we size the buffer for the maximum possible number of items in
+ * the range (based on range size and max number of items on a page).
+ *
+ * XXX This may require quite a bit of memory, so maybe we should use
+ * some value in between. OTOH most tables will have much wider rows,
+ * so the number of rows per page is much lower.
*/
if (column->bv_allnulls)
{
MemoryContext oldctx;
- oldctx = MemoryContextSwitchTo(column->bv_context);
+ BlockNumber pagesPerRange = BrinGetPagesPerRange(bdesc->bd_index);
- ranges = minmax_multi_init(brin_minmax_multi_get_values(bdesc, opts));
+ oldctx = MemoryContextSwitchTo(column->bv_context);
+ ranges = minmax_multi_init(MaxHeapTuplesPerPage * pagesPerRange);
+ ranges->attno = attno;
+ ranges->colloid = colloid;
ranges->typid = attr->atttypid;
+ ranges->batch_mode = true;
+ ranges->target_maxvalues = brin_minmax_multi_get_values(bdesc, opts);
MemoryContextSwitchTo(oldctx);
@@ -2125,7 +2289,7 @@ brin_minmax_multi_union(PG_FUNCTION_ARGS)
oldctx = MemoryContextSwitchTo(ctx);
/* allocate and fill */
- cranges = (CombineRange *)palloc0(ncranges * sizeof(CombineRange));
+ cranges = (CombineRange *) palloc0(ncranges * sizeof(CombineRange));
/* fill the combine ranges with entries for the first range */
fill_combine_ranges(cranges, ranges_a->nranges + ranges_a->nvalues,
@@ -2139,8 +2303,8 @@ brin_minmax_multi_union(PG_FUNCTION_ARGS)
cmpFn = minmax_multi_get_strategy_procinfo(bdesc, attno, attr->atttypid,
BTLessStrategyNumber);
- /* sort the combine ranges */
- sort_combine_ranges(cmpFn, colloid, cranges, ncranges);
+ /* sort the combine ranges (don't deduplicate) */
+ sort_combine_ranges(cmpFn, colloid, cranges, ncranges, false);
/*
* We've merged two different lists of ranges, so some of them may be
diff --git a/src/backend/access/brin/brin_tuple.c b/src/backend/access/brin/brin_tuple.c
index df820db029..bf8635d788 100644
--- a/src/backend/access/brin/brin_tuple.c
+++ b/src/backend/access/brin/brin_tuple.c
@@ -163,6 +163,7 @@ brin_form_tuple(BrinDesc *brdesc, BlockNumber blkno, BrinMemTuple *tuple,
if (tuple->bt_columns[keyno].bv_serialize)
{
tuple->bt_columns[keyno].bv_serialize(
+ brdesc,
tuple->bt_columns[keyno].bv_mem_value,
tuple->bt_columns[keyno].bv_values);
}
diff --git a/src/include/access/brin_tuple.h b/src/include/access/brin_tuple.h
index 66a6c3c792..e08998b71a 100644
--- a/src/include/access/brin_tuple.h
+++ b/src/include/access/brin_tuple.h
@@ -14,7 +14,7 @@
#include "access/brin_internal.h"
#include "access/tupdesc.h"
-typedef void (*brin_serialize_callback_type) (Datum src, Datum * dst);
+typedef void (*brin_serialize_callback_type) (BrinDesc *bdesc, Datum src, Datum * dst);
/*
* A BRIN index stores one index tuple per page range. Each index tuple
--
2.26.2
--------------FA974B75A0C3E9CA18CE7207
Content-Type: application/x-shellscript;
name="brin.sh"
Content-Transfer-Encoding: base64
Content-Disposition: attachment;
filename="brin.sh"
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--------------FA974B75A0C3E9CA18CE7207--
^ permalink raw reply [nested|flat] 29+ messages in thread
* [PATCH 8/8] batch build
@ 2021-01-22 00:11 Tomas Vondra <[email protected]>
0 siblings, 0 replies; 29+ messages in thread
From: Tomas Vondra @ 2021-01-22 00:11 UTC (permalink / raw)
---
src/backend/access/brin/brin_minmax_multi.c | 204 ++++++++++++++++++--
src/backend/access/brin/brin_tuple.c | 1 +
src/include/access/brin_tuple.h | 2 +-
3 files changed, 186 insertions(+), 21 deletions(-)
diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 094ecd2be9..72cca6f26b 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -57,6 +57,7 @@
#include "access/brin.h"
#include "access/brin_internal.h"
#include "access/brin_tuple.h"
+#include "access/hash.h" /* XXX strange that it fails because of BRIN_AM_OID without this */
#include "access/reloptions.h"
#include "access/stratnum.h"
#include "access/htup_details.h"
@@ -150,12 +151,23 @@ typedef struct MinMaxOptions
typedef struct Ranges
{
Oid typid;
+ Oid colloid;
+ AttrNumber attno;
/* (2*nranges + nvalues) <= maxvalues */
int nranges; /* number of ranges in the array (stored) */
int nvalues; /* number of values in the data array (all) */
int maxvalues; /* maximum number of values (reloption) */
+ /*
+ * Batch mode means we're simply appending values into new range,
+ * without any expensive steps (sorting, deduplication, ...). The
+ * buffer is sized to be much larger, but we keep the actual target
+ * size so that when serializing values we can do the right thing.
+ */
+ bool batch_mode;
+ int target_maxvalues;
+
/* values stored for this range - either raw values, or ranges */
Datum values[FLEXIBLE_ARRAY_MEMBER];
} Ranges;
@@ -375,6 +387,7 @@ range_deserialize(SerializedRanges *serialized)
range->nvalues = serialized->nvalues;
range->maxvalues = serialized->maxvalues;
range->typid = serialized->typid;
+ range->batch_mode = false;
typbyval = get_typbyval(serialized->typid);
typlen = get_typlen(serialized->typid);
@@ -844,11 +857,14 @@ fill_combine_ranges(CombineRange *cranges, int ncranges, Ranges *ranges)
/*
* Sort combine ranges using qsort (with BTLessStrategyNumber function).
*/
-static void
+static int
sort_combine_ranges(FmgrInfo *cmp, Oid colloid,
- CombineRange *cranges, int ncranges)
+ CombineRange *cranges, int ncranges,
+ bool deduplicate)
{
- compare_context cxt;
+ int n;
+ int i;
+ compare_context cxt;
/* sort the values */
cxt.colloid = colloid;
@@ -856,6 +872,24 @@ sort_combine_ranges(FmgrInfo *cmp, Oid colloid,
qsort_arg(cranges, ncranges, sizeof(CombineRange),
compare_combine_ranges, (void *) &cxt);
+
+ if (!deduplicate)
+ return ncranges;
+
+ /* optionally deduplicate the ranges */
+ n = 1;
+ for (i = 1; i < ncranges; i++)
+ {
+ if (compare_combine_ranges(&cranges[i-1], &cranges[i], (void *) &cxt))
+ {
+ if (i != n)
+ memcpy(&cranges[n], &cranges[i], sizeof(CombineRange));
+
+ n++;
+ }
+ }
+
+ return n;
}
/*
@@ -1026,26 +1060,40 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
*/
static CombineRange *
build_combine_ranges(FmgrInfo *cmp, Oid colloid, Ranges *ranges,
- Datum newvalue, int *nranges)
+ bool addvalue, Datum newvalue, int *nranges,
+ bool deduplicate)
{
int ncranges;
CombineRange *cranges;
/* now do the actual merge sort */
- ncranges = ranges->nranges + ranges->nvalues + 1;
+ ncranges = ranges->nranges + ranges->nvalues;
+
+ /* should we add an extra value? */
+ if (addvalue)
+ ncranges += 1;
+
cranges = (CombineRange *) palloc0(ncranges * sizeof(CombineRange));
- *nranges = ncranges;
/* put the new value at the beginning */
- cranges[0].minval = newvalue;
- cranges[0].maxval = newvalue;
- cranges[0].collapsed = true;
+ if (addvalue)
+ {
+ cranges[0].minval = newvalue;
+ cranges[0].maxval = newvalue;
+ cranges[0].collapsed = true;
- /* then the regular and collapsed ranges */
- fill_combine_ranges(&cranges[1], ncranges-1, ranges);
+ /* then the regular and collapsed ranges */
+ fill_combine_ranges(&cranges[1], ncranges-1, ranges);
+ }
+ else
+ fill_combine_ranges(cranges, ncranges, ranges);
/* and sort the ranges */
- sort_combine_ranges(cmp, colloid, cranges, ncranges);
+ ncranges = sort_combine_ranges(cmp, colloid, cranges, ncranges,
+ deduplicate);
+
+ /* remember how many cranges we built */
+ *nranges = ncranges;
return cranges;
}
@@ -1074,6 +1122,7 @@ count_values(CombineRange *cranges, int ncranges)
}
#endif
+
/*
* reduce_combine_ranges
* reduce the ranges until the number of values is low enough
@@ -1250,6 +1299,25 @@ range_add_value(BrinDesc *bdesc, Oid colloid,
Assert(2*ranges->nranges + ranges->nvalues <= ranges->maxvalues);
+ Assert((ranges->nranges >= 0) && (ranges->nvalues >= 0) && (ranges->maxvalues >= 0));
+
+ /*
+ * When batch-building, there should be no ranges. So either the
+ * number of ranges is 0 or we're not in batching mode.
+ */
+ Assert(!ranges->batch_mode || (ranges->nranges == 0));
+
+ /* When batch-building, just add it and we're done. */
+ if (ranges->batch_mode)
+ {
+ /* there has to be free space, if we've sized the struct */
+ Assert(ranges->nvalues < ranges->maxvalues);
+
+ ranges->values[ranges->nvalues++] = newval;
+
+ return true;
+ }
+
/*
* Bail out if the value already is covered by the range.
*
@@ -1322,7 +1390,9 @@ range_add_value(BrinDesc *bdesc, Oid colloid,
ranges->nvalues);
/* OK build the combine ranges */
- cranges = build_combine_ranges(cmpFn, colloid, ranges, newval, &ncranges);
+ cranges = build_combine_ranges(cmpFn, colloid, ranges,
+ true, newval, &ncranges,
+ false);
/* Reduce the ranges if needed */
if (ncranges > ranges->maxvalues)
@@ -1382,6 +1452,81 @@ range_add_value(BrinDesc *bdesc, Oid colloid,
return true;
}
+/*
+ * Generate range representation of data collected during "batch mode".
+ * This is similar to reduce_combine_ranges, except that we can't assume
+ * the values are sorted and there may be duplicate values.
+ */
+static void
+compactify_ranges(BrinDesc *bdesc, Ranges *ranges, int max_values)
+{
+ FmgrInfo *cmpFn,
+ *distanceFn;
+
+ /* combine ranges */
+ CombineRange *cranges;
+ int ncranges;
+ DistanceValue *distances;
+
+ MemoryContext ctx;
+ MemoryContext oldctx;
+
+ /*
+ * This should only be used in batch mode, and there should be no
+ * ranges, just individual values.
+ */
+ Assert((ranges->batch_mode) && (ranges->nranges == 0));
+
+ /* we'll certainly need the comparator, so just look it up now */
+ cmpFn = minmax_multi_get_strategy_procinfo(bdesc, ranges->attno, ranges->typid,
+ BTLessStrategyNumber);
+
+ /* and we'll also need the 'distance' procedure */
+ distanceFn = minmax_multi_get_procinfo(bdesc, ranges->attno, PROCNUM_DISTANCE);
+
+ /*
+ * The distanceFn calls (which may internally call e.g. numeric_le) may
+ * allocate quite a bit of memory, and we must not leak it. Otherwise
+ * we'd have problems e.g. when building indexes. So we create a local
+ * memory context and make sure we free the memory before leaving this
+ * function (not after every call).
+ */
+ ctx = AllocSetContextCreate(CurrentMemoryContext,
+ "minmax-multi context",
+ ALLOCSET_DEFAULT_SIZES);
+
+ oldctx = MemoryContextSwitchTo(ctx);
+
+ /* OK build the combine ranges */
+ cranges = build_combine_ranges(cmpFn, ranges->colloid, ranges,
+ false, (Datum) 0, &ncranges,
+ true); /* deduplicate */
+
+ /* build array of gap distances and sort them in ascending order */
+ distances = build_distances(distanceFn, ranges->colloid, cranges, ncranges);
+
+ /*
+ * Combine ranges until we get below max_values. We don't use any scale
+ * factor, because this is used at the very end of "batch mode" and we
+ * don't expect more tuples to be inserted soon.
+ */
+ ncranges = reduce_combine_ranges(cranges, ncranges, distances,
+ max_values, cmpFn, ranges->colloid);
+
+ Assert(count_values(cranges, ncranges) <= max_values);
+
+ /* decompose the combine ranges into regular ranges and single values */
+ store_combine_ranges(ranges, cranges, ncranges);
+
+ MemoryContextSwitchTo(oldctx);
+ MemoryContextDelete(ctx);
+
+ /* Check the ordering invariants are not violated (for both parts). */
+ AssertArrayOrder(cmpFn, ranges->colloid, ranges->values, ranges->nranges*2);
+ AssertArrayOrder(cmpFn, ranges->colloid, &ranges->values[ranges->nranges*2],
+ ranges->nvalues);
+}
+
Datum
brin_minmax_multi_opcinfo(PG_FUNCTION_ARGS)
{
@@ -1799,10 +1944,16 @@ brin_minmax_multi_distance_inet(PG_FUNCTION_ARGS)
}
static void
-brin_minmax_multi_serialize(Datum src, Datum *dst)
+brin_minmax_multi_serialize(BrinDesc *bdesc, Datum src, Datum *dst)
{
Ranges *ranges = (Ranges *) DatumGetPointer(src);
- SerializedRanges *s = range_serialize(ranges);
+ SerializedRanges *s;
+
+ /* In batch mode, we need to compress the accumulated values. */
+ if (ranges->batch_mode)
+ compactify_ranges(bdesc, ranges, ranges->target_maxvalues);
+
+ s = range_serialize(ranges);
dst[0] = PointerGetDatum(s);
}
@@ -1845,15 +1996,28 @@ brin_minmax_multi_add_value(PG_FUNCTION_ARGS)
/*
* If this is the first non-null value, we need to initialize the range
* list. Otherwise just extract the existing range list from BrinValues.
+ *
+ * When starting with an empty range, we assume this is a batch mode,
+ * i.e. we size the buffer for the maximum possible number of items in
+ * the range (based on range size and max number of items on a page).
+ *
+ * XXX This may require quite a bit of memory, so maybe we should use
+ * some value in between. OTOH most tables will have much wider rows,
+ * so the number of rows per page is much lower.
*/
if (column->bv_allnulls)
{
MemoryContext oldctx;
- oldctx = MemoryContextSwitchTo(column->bv_context);
+ BlockNumber pagesPerRange = BrinGetPagesPerRange(bdesc->bd_index);
- ranges = minmax_multi_init(brin_minmax_multi_get_values(bdesc, opts));
+ oldctx = MemoryContextSwitchTo(column->bv_context);
+ ranges = minmax_multi_init(MaxHeapTuplesPerPage * pagesPerRange);
+ ranges->attno = attno;
+ ranges->colloid = colloid;
ranges->typid = attr->atttypid;
+ ranges->batch_mode = true;
+ ranges->target_maxvalues = brin_minmax_multi_get_values(bdesc, opts);
MemoryContextSwitchTo(oldctx);
@@ -2125,7 +2289,7 @@ brin_minmax_multi_union(PG_FUNCTION_ARGS)
oldctx = MemoryContextSwitchTo(ctx);
/* allocate and fill */
- cranges = (CombineRange *)palloc0(ncranges * sizeof(CombineRange));
+ cranges = (CombineRange *) palloc0(ncranges * sizeof(CombineRange));
/* fill the combine ranges with entries for the first range */
fill_combine_ranges(cranges, ranges_a->nranges + ranges_a->nvalues,
@@ -2139,8 +2303,8 @@ brin_minmax_multi_union(PG_FUNCTION_ARGS)
cmpFn = minmax_multi_get_strategy_procinfo(bdesc, attno, attr->atttypid,
BTLessStrategyNumber);
- /* sort the combine ranges */
- sort_combine_ranges(cmpFn, colloid, cranges, ncranges);
+ /* sort the combine ranges (don't deduplicate) */
+ sort_combine_ranges(cmpFn, colloid, cranges, ncranges, false);
/*
* We've merged two different lists of ranges, so some of them may be
diff --git a/src/backend/access/brin/brin_tuple.c b/src/backend/access/brin/brin_tuple.c
index df820db029..bf8635d788 100644
--- a/src/backend/access/brin/brin_tuple.c
+++ b/src/backend/access/brin/brin_tuple.c
@@ -163,6 +163,7 @@ brin_form_tuple(BrinDesc *brdesc, BlockNumber blkno, BrinMemTuple *tuple,
if (tuple->bt_columns[keyno].bv_serialize)
{
tuple->bt_columns[keyno].bv_serialize(
+ brdesc,
tuple->bt_columns[keyno].bv_mem_value,
tuple->bt_columns[keyno].bv_values);
}
diff --git a/src/include/access/brin_tuple.h b/src/include/access/brin_tuple.h
index 66a6c3c792..e08998b71a 100644
--- a/src/include/access/brin_tuple.h
+++ b/src/include/access/brin_tuple.h
@@ -14,7 +14,7 @@
#include "access/brin_internal.h"
#include "access/tupdesc.h"
-typedef void (*brin_serialize_callback_type) (Datum src, Datum * dst);
+typedef void (*brin_serialize_callback_type) (BrinDesc *bdesc, Datum src, Datum * dst);
/*
* A BRIN index stores one index tuple per page range. Each index tuple
--
2.26.2
--------------FA974B75A0C3E9CA18CE7207
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--------------FA974B75A0C3E9CA18CE7207--
^ permalink raw reply [nested|flat] 29+ messages in thread
* [PATCH 8/8] batch build
@ 2021-01-22 00:11 Tomas Vondra <[email protected]>
0 siblings, 0 replies; 29+ messages in thread
From: Tomas Vondra @ 2021-01-22 00:11 UTC (permalink / raw)
---
src/backend/access/brin/brin_minmax_multi.c | 204 ++++++++++++++++++--
src/backend/access/brin/brin_tuple.c | 1 +
src/include/access/brin_tuple.h | 2 +-
3 files changed, 186 insertions(+), 21 deletions(-)
diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 094ecd2be9..72cca6f26b 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -57,6 +57,7 @@
#include "access/brin.h"
#include "access/brin_internal.h"
#include "access/brin_tuple.h"
+#include "access/hash.h" /* XXX strange that it fails because of BRIN_AM_OID without this */
#include "access/reloptions.h"
#include "access/stratnum.h"
#include "access/htup_details.h"
@@ -150,12 +151,23 @@ typedef struct MinMaxOptions
typedef struct Ranges
{
Oid typid;
+ Oid colloid;
+ AttrNumber attno;
/* (2*nranges + nvalues) <= maxvalues */
int nranges; /* number of ranges in the array (stored) */
int nvalues; /* number of values in the data array (all) */
int maxvalues; /* maximum number of values (reloption) */
+ /*
+ * Batch mode means we're simply appending values into new range,
+ * without any expensive steps (sorting, deduplication, ...). The
+ * buffer is sized to be much larger, but we keep the actual target
+ * size so that when serializing values we can do the right thing.
+ */
+ bool batch_mode;
+ int target_maxvalues;
+
/* values stored for this range - either raw values, or ranges */
Datum values[FLEXIBLE_ARRAY_MEMBER];
} Ranges;
@@ -375,6 +387,7 @@ range_deserialize(SerializedRanges *serialized)
range->nvalues = serialized->nvalues;
range->maxvalues = serialized->maxvalues;
range->typid = serialized->typid;
+ range->batch_mode = false;
typbyval = get_typbyval(serialized->typid);
typlen = get_typlen(serialized->typid);
@@ -844,11 +857,14 @@ fill_combine_ranges(CombineRange *cranges, int ncranges, Ranges *ranges)
/*
* Sort combine ranges using qsort (with BTLessStrategyNumber function).
*/
-static void
+static int
sort_combine_ranges(FmgrInfo *cmp, Oid colloid,
- CombineRange *cranges, int ncranges)
+ CombineRange *cranges, int ncranges,
+ bool deduplicate)
{
- compare_context cxt;
+ int n;
+ int i;
+ compare_context cxt;
/* sort the values */
cxt.colloid = colloid;
@@ -856,6 +872,24 @@ sort_combine_ranges(FmgrInfo *cmp, Oid colloid,
qsort_arg(cranges, ncranges, sizeof(CombineRange),
compare_combine_ranges, (void *) &cxt);
+
+ if (!deduplicate)
+ return ncranges;
+
+ /* optionally deduplicate the ranges */
+ n = 1;
+ for (i = 1; i < ncranges; i++)
+ {
+ if (compare_combine_ranges(&cranges[i-1], &cranges[i], (void *) &cxt))
+ {
+ if (i != n)
+ memcpy(&cranges[n], &cranges[i], sizeof(CombineRange));
+
+ n++;
+ }
+ }
+
+ return n;
}
/*
@@ -1026,26 +1060,40 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
*/
static CombineRange *
build_combine_ranges(FmgrInfo *cmp, Oid colloid, Ranges *ranges,
- Datum newvalue, int *nranges)
+ bool addvalue, Datum newvalue, int *nranges,
+ bool deduplicate)
{
int ncranges;
CombineRange *cranges;
/* now do the actual merge sort */
- ncranges = ranges->nranges + ranges->nvalues + 1;
+ ncranges = ranges->nranges + ranges->nvalues;
+
+ /* should we add an extra value? */
+ if (addvalue)
+ ncranges += 1;
+
cranges = (CombineRange *) palloc0(ncranges * sizeof(CombineRange));
- *nranges = ncranges;
/* put the new value at the beginning */
- cranges[0].minval = newvalue;
- cranges[0].maxval = newvalue;
- cranges[0].collapsed = true;
+ if (addvalue)
+ {
+ cranges[0].minval = newvalue;
+ cranges[0].maxval = newvalue;
+ cranges[0].collapsed = true;
- /* then the regular and collapsed ranges */
- fill_combine_ranges(&cranges[1], ncranges-1, ranges);
+ /* then the regular and collapsed ranges */
+ fill_combine_ranges(&cranges[1], ncranges-1, ranges);
+ }
+ else
+ fill_combine_ranges(cranges, ncranges, ranges);
/* and sort the ranges */
- sort_combine_ranges(cmp, colloid, cranges, ncranges);
+ ncranges = sort_combine_ranges(cmp, colloid, cranges, ncranges,
+ deduplicate);
+
+ /* remember how many cranges we built */
+ *nranges = ncranges;
return cranges;
}
@@ -1074,6 +1122,7 @@ count_values(CombineRange *cranges, int ncranges)
}
#endif
+
/*
* reduce_combine_ranges
* reduce the ranges until the number of values is low enough
@@ -1250,6 +1299,25 @@ range_add_value(BrinDesc *bdesc, Oid colloid,
Assert(2*ranges->nranges + ranges->nvalues <= ranges->maxvalues);
+ Assert((ranges->nranges >= 0) && (ranges->nvalues >= 0) && (ranges->maxvalues >= 0));
+
+ /*
+ * When batch-building, there should be no ranges. So either the
+ * number of ranges is 0 or we're not in batching mode.
+ */
+ Assert(!ranges->batch_mode || (ranges->nranges == 0));
+
+ /* When batch-building, just add it and we're done. */
+ if (ranges->batch_mode)
+ {
+ /* there has to be free space, if we've sized the struct */
+ Assert(ranges->nvalues < ranges->maxvalues);
+
+ ranges->values[ranges->nvalues++] = newval;
+
+ return true;
+ }
+
/*
* Bail out if the value already is covered by the range.
*
@@ -1322,7 +1390,9 @@ range_add_value(BrinDesc *bdesc, Oid colloid,
ranges->nvalues);
/* OK build the combine ranges */
- cranges = build_combine_ranges(cmpFn, colloid, ranges, newval, &ncranges);
+ cranges = build_combine_ranges(cmpFn, colloid, ranges,
+ true, newval, &ncranges,
+ false);
/* Reduce the ranges if needed */
if (ncranges > ranges->maxvalues)
@@ -1382,6 +1452,81 @@ range_add_value(BrinDesc *bdesc, Oid colloid,
return true;
}
+/*
+ * Generate range representation of data collected during "batch mode".
+ * This is similar to reduce_combine_ranges, except that we can't assume
+ * the values are sorted and there may be duplicate values.
+ */
+static void
+compactify_ranges(BrinDesc *bdesc, Ranges *ranges, int max_values)
+{
+ FmgrInfo *cmpFn,
+ *distanceFn;
+
+ /* combine ranges */
+ CombineRange *cranges;
+ int ncranges;
+ DistanceValue *distances;
+
+ MemoryContext ctx;
+ MemoryContext oldctx;
+
+ /*
+ * This should only be used in batch mode, and there should be no
+ * ranges, just individual values.
+ */
+ Assert((ranges->batch_mode) && (ranges->nranges == 0));
+
+ /* we'll certainly need the comparator, so just look it up now */
+ cmpFn = minmax_multi_get_strategy_procinfo(bdesc, ranges->attno, ranges->typid,
+ BTLessStrategyNumber);
+
+ /* and we'll also need the 'distance' procedure */
+ distanceFn = minmax_multi_get_procinfo(bdesc, ranges->attno, PROCNUM_DISTANCE);
+
+ /*
+ * The distanceFn calls (which may internally call e.g. numeric_le) may
+ * allocate quite a bit of memory, and we must not leak it. Otherwise
+ * we'd have problems e.g. when building indexes. So we create a local
+ * memory context and make sure we free the memory before leaving this
+ * function (not after every call).
+ */
+ ctx = AllocSetContextCreate(CurrentMemoryContext,
+ "minmax-multi context",
+ ALLOCSET_DEFAULT_SIZES);
+
+ oldctx = MemoryContextSwitchTo(ctx);
+
+ /* OK build the combine ranges */
+ cranges = build_combine_ranges(cmpFn, ranges->colloid, ranges,
+ false, (Datum) 0, &ncranges,
+ true); /* deduplicate */
+
+ /* build array of gap distances and sort them in ascending order */
+ distances = build_distances(distanceFn, ranges->colloid, cranges, ncranges);
+
+ /*
+ * Combine ranges until we get below max_values. We don't use any scale
+ * factor, because this is used at the very end of "batch mode" and we
+ * don't expect more tuples to be inserted soon.
+ */
+ ncranges = reduce_combine_ranges(cranges, ncranges, distances,
+ max_values, cmpFn, ranges->colloid);
+
+ Assert(count_values(cranges, ncranges) <= max_values);
+
+ /* decompose the combine ranges into regular ranges and single values */
+ store_combine_ranges(ranges, cranges, ncranges);
+
+ MemoryContextSwitchTo(oldctx);
+ MemoryContextDelete(ctx);
+
+ /* Check the ordering invariants are not violated (for both parts). */
+ AssertArrayOrder(cmpFn, ranges->colloid, ranges->values, ranges->nranges*2);
+ AssertArrayOrder(cmpFn, ranges->colloid, &ranges->values[ranges->nranges*2],
+ ranges->nvalues);
+}
+
Datum
brin_minmax_multi_opcinfo(PG_FUNCTION_ARGS)
{
@@ -1799,10 +1944,16 @@ brin_minmax_multi_distance_inet(PG_FUNCTION_ARGS)
}
static void
-brin_minmax_multi_serialize(Datum src, Datum *dst)
+brin_minmax_multi_serialize(BrinDesc *bdesc, Datum src, Datum *dst)
{
Ranges *ranges = (Ranges *) DatumGetPointer(src);
- SerializedRanges *s = range_serialize(ranges);
+ SerializedRanges *s;
+
+ /* In batch mode, we need to compress the accumulated values. */
+ if (ranges->batch_mode)
+ compactify_ranges(bdesc, ranges, ranges->target_maxvalues);
+
+ s = range_serialize(ranges);
dst[0] = PointerGetDatum(s);
}
@@ -1845,15 +1996,28 @@ brin_minmax_multi_add_value(PG_FUNCTION_ARGS)
/*
* If this is the first non-null value, we need to initialize the range
* list. Otherwise just extract the existing range list from BrinValues.
+ *
+ * When starting with an empty range, we assume this is a batch mode,
+ * i.e. we size the buffer for the maximum possible number of items in
+ * the range (based on range size and max number of items on a page).
+ *
+ * XXX This may require quite a bit of memory, so maybe we should use
+ * some value in between. OTOH most tables will have much wider rows,
+ * so the number of rows per page is much lower.
*/
if (column->bv_allnulls)
{
MemoryContext oldctx;
- oldctx = MemoryContextSwitchTo(column->bv_context);
+ BlockNumber pagesPerRange = BrinGetPagesPerRange(bdesc->bd_index);
- ranges = minmax_multi_init(brin_minmax_multi_get_values(bdesc, opts));
+ oldctx = MemoryContextSwitchTo(column->bv_context);
+ ranges = minmax_multi_init(MaxHeapTuplesPerPage * pagesPerRange);
+ ranges->attno = attno;
+ ranges->colloid = colloid;
ranges->typid = attr->atttypid;
+ ranges->batch_mode = true;
+ ranges->target_maxvalues = brin_minmax_multi_get_values(bdesc, opts);
MemoryContextSwitchTo(oldctx);
@@ -2125,7 +2289,7 @@ brin_minmax_multi_union(PG_FUNCTION_ARGS)
oldctx = MemoryContextSwitchTo(ctx);
/* allocate and fill */
- cranges = (CombineRange *)palloc0(ncranges * sizeof(CombineRange));
+ cranges = (CombineRange *) palloc0(ncranges * sizeof(CombineRange));
/* fill the combine ranges with entries for the first range */
fill_combine_ranges(cranges, ranges_a->nranges + ranges_a->nvalues,
@@ -2139,8 +2303,8 @@ brin_minmax_multi_union(PG_FUNCTION_ARGS)
cmpFn = minmax_multi_get_strategy_procinfo(bdesc, attno, attr->atttypid,
BTLessStrategyNumber);
- /* sort the combine ranges */
- sort_combine_ranges(cmpFn, colloid, cranges, ncranges);
+ /* sort the combine ranges (don't deduplicate) */
+ sort_combine_ranges(cmpFn, colloid, cranges, ncranges, false);
/*
* We've merged two different lists of ranges, so some of them may be
diff --git a/src/backend/access/brin/brin_tuple.c b/src/backend/access/brin/brin_tuple.c
index df820db029..bf8635d788 100644
--- a/src/backend/access/brin/brin_tuple.c
+++ b/src/backend/access/brin/brin_tuple.c
@@ -163,6 +163,7 @@ brin_form_tuple(BrinDesc *brdesc, BlockNumber blkno, BrinMemTuple *tuple,
if (tuple->bt_columns[keyno].bv_serialize)
{
tuple->bt_columns[keyno].bv_serialize(
+ brdesc,
tuple->bt_columns[keyno].bv_mem_value,
tuple->bt_columns[keyno].bv_values);
}
diff --git a/src/include/access/brin_tuple.h b/src/include/access/brin_tuple.h
index 66a6c3c792..e08998b71a 100644
--- a/src/include/access/brin_tuple.h
+++ b/src/include/access/brin_tuple.h
@@ -14,7 +14,7 @@
#include "access/brin_internal.h"
#include "access/tupdesc.h"
-typedef void (*brin_serialize_callback_type) (Datum src, Datum * dst);
+typedef void (*brin_serialize_callback_type) (BrinDesc *bdesc, Datum src, Datum * dst);
/*
* A BRIN index stores one index tuple per page range. Each index tuple
--
2.26.2
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--------------FA974B75A0C3E9CA18CE7207--
^ permalink raw reply [nested|flat] 29+ messages in thread
* [PATCH 8/8] batch build
@ 2021-01-22 00:11 Tomas Vondra <[email protected]>
0 siblings, 0 replies; 29+ messages in thread
From: Tomas Vondra @ 2021-01-22 00:11 UTC (permalink / raw)
---
src/backend/access/brin/brin_minmax_multi.c | 204 ++++++++++++++++++--
src/backend/access/brin/brin_tuple.c | 1 +
src/include/access/brin_tuple.h | 2 +-
3 files changed, 186 insertions(+), 21 deletions(-)
diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 094ecd2be9..72cca6f26b 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -57,6 +57,7 @@
#include "access/brin.h"
#include "access/brin_internal.h"
#include "access/brin_tuple.h"
+#include "access/hash.h" /* XXX strange that it fails because of BRIN_AM_OID without this */
#include "access/reloptions.h"
#include "access/stratnum.h"
#include "access/htup_details.h"
@@ -150,12 +151,23 @@ typedef struct MinMaxOptions
typedef struct Ranges
{
Oid typid;
+ Oid colloid;
+ AttrNumber attno;
/* (2*nranges + nvalues) <= maxvalues */
int nranges; /* number of ranges in the array (stored) */
int nvalues; /* number of values in the data array (all) */
int maxvalues; /* maximum number of values (reloption) */
+ /*
+ * Batch mode means we're simply appending values into new range,
+ * without any expensive steps (sorting, deduplication, ...). The
+ * buffer is sized to be much larger, but we keep the actual target
+ * size so that when serializing values we can do the right thing.
+ */
+ bool batch_mode;
+ int target_maxvalues;
+
/* values stored for this range - either raw values, or ranges */
Datum values[FLEXIBLE_ARRAY_MEMBER];
} Ranges;
@@ -375,6 +387,7 @@ range_deserialize(SerializedRanges *serialized)
range->nvalues = serialized->nvalues;
range->maxvalues = serialized->maxvalues;
range->typid = serialized->typid;
+ range->batch_mode = false;
typbyval = get_typbyval(serialized->typid);
typlen = get_typlen(serialized->typid);
@@ -844,11 +857,14 @@ fill_combine_ranges(CombineRange *cranges, int ncranges, Ranges *ranges)
/*
* Sort combine ranges using qsort (with BTLessStrategyNumber function).
*/
-static void
+static int
sort_combine_ranges(FmgrInfo *cmp, Oid colloid,
- CombineRange *cranges, int ncranges)
+ CombineRange *cranges, int ncranges,
+ bool deduplicate)
{
- compare_context cxt;
+ int n;
+ int i;
+ compare_context cxt;
/* sort the values */
cxt.colloid = colloid;
@@ -856,6 +872,24 @@ sort_combine_ranges(FmgrInfo *cmp, Oid colloid,
qsort_arg(cranges, ncranges, sizeof(CombineRange),
compare_combine_ranges, (void *) &cxt);
+
+ if (!deduplicate)
+ return ncranges;
+
+ /* optionally deduplicate the ranges */
+ n = 1;
+ for (i = 1; i < ncranges; i++)
+ {
+ if (compare_combine_ranges(&cranges[i-1], &cranges[i], (void *) &cxt))
+ {
+ if (i != n)
+ memcpy(&cranges[n], &cranges[i], sizeof(CombineRange));
+
+ n++;
+ }
+ }
+
+ return n;
}
/*
@@ -1026,26 +1060,40 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
*/
static CombineRange *
build_combine_ranges(FmgrInfo *cmp, Oid colloid, Ranges *ranges,
- Datum newvalue, int *nranges)
+ bool addvalue, Datum newvalue, int *nranges,
+ bool deduplicate)
{
int ncranges;
CombineRange *cranges;
/* now do the actual merge sort */
- ncranges = ranges->nranges + ranges->nvalues + 1;
+ ncranges = ranges->nranges + ranges->nvalues;
+
+ /* should we add an extra value? */
+ if (addvalue)
+ ncranges += 1;
+
cranges = (CombineRange *) palloc0(ncranges * sizeof(CombineRange));
- *nranges = ncranges;
/* put the new value at the beginning */
- cranges[0].minval = newvalue;
- cranges[0].maxval = newvalue;
- cranges[0].collapsed = true;
+ if (addvalue)
+ {
+ cranges[0].minval = newvalue;
+ cranges[0].maxval = newvalue;
+ cranges[0].collapsed = true;
- /* then the regular and collapsed ranges */
- fill_combine_ranges(&cranges[1], ncranges-1, ranges);
+ /* then the regular and collapsed ranges */
+ fill_combine_ranges(&cranges[1], ncranges-1, ranges);
+ }
+ else
+ fill_combine_ranges(cranges, ncranges, ranges);
/* and sort the ranges */
- sort_combine_ranges(cmp, colloid, cranges, ncranges);
+ ncranges = sort_combine_ranges(cmp, colloid, cranges, ncranges,
+ deduplicate);
+
+ /* remember how many cranges we built */
+ *nranges = ncranges;
return cranges;
}
@@ -1074,6 +1122,7 @@ count_values(CombineRange *cranges, int ncranges)
}
#endif
+
/*
* reduce_combine_ranges
* reduce the ranges until the number of values is low enough
@@ -1250,6 +1299,25 @@ range_add_value(BrinDesc *bdesc, Oid colloid,
Assert(2*ranges->nranges + ranges->nvalues <= ranges->maxvalues);
+ Assert((ranges->nranges >= 0) && (ranges->nvalues >= 0) && (ranges->maxvalues >= 0));
+
+ /*
+ * When batch-building, there should be no ranges. So either the
+ * number of ranges is 0 or we're not in batching mode.
+ */
+ Assert(!ranges->batch_mode || (ranges->nranges == 0));
+
+ /* When batch-building, just add it and we're done. */
+ if (ranges->batch_mode)
+ {
+ /* there has to be free space, if we've sized the struct */
+ Assert(ranges->nvalues < ranges->maxvalues);
+
+ ranges->values[ranges->nvalues++] = newval;
+
+ return true;
+ }
+
/*
* Bail out if the value already is covered by the range.
*
@@ -1322,7 +1390,9 @@ range_add_value(BrinDesc *bdesc, Oid colloid,
ranges->nvalues);
/* OK build the combine ranges */
- cranges = build_combine_ranges(cmpFn, colloid, ranges, newval, &ncranges);
+ cranges = build_combine_ranges(cmpFn, colloid, ranges,
+ true, newval, &ncranges,
+ false);
/* Reduce the ranges if needed */
if (ncranges > ranges->maxvalues)
@@ -1382,6 +1452,81 @@ range_add_value(BrinDesc *bdesc, Oid colloid,
return true;
}
+/*
+ * Generate range representation of data collected during "batch mode".
+ * This is similar to reduce_combine_ranges, except that we can't assume
+ * the values are sorted and there may be duplicate values.
+ */
+static void
+compactify_ranges(BrinDesc *bdesc, Ranges *ranges, int max_values)
+{
+ FmgrInfo *cmpFn,
+ *distanceFn;
+
+ /* combine ranges */
+ CombineRange *cranges;
+ int ncranges;
+ DistanceValue *distances;
+
+ MemoryContext ctx;
+ MemoryContext oldctx;
+
+ /*
+ * This should only be used in batch mode, and there should be no
+ * ranges, just individual values.
+ */
+ Assert((ranges->batch_mode) && (ranges->nranges == 0));
+
+ /* we'll certainly need the comparator, so just look it up now */
+ cmpFn = minmax_multi_get_strategy_procinfo(bdesc, ranges->attno, ranges->typid,
+ BTLessStrategyNumber);
+
+ /* and we'll also need the 'distance' procedure */
+ distanceFn = minmax_multi_get_procinfo(bdesc, ranges->attno, PROCNUM_DISTANCE);
+
+ /*
+ * The distanceFn calls (which may internally call e.g. numeric_le) may
+ * allocate quite a bit of memory, and we must not leak it. Otherwise
+ * we'd have problems e.g. when building indexes. So we create a local
+ * memory context and make sure we free the memory before leaving this
+ * function (not after every call).
+ */
+ ctx = AllocSetContextCreate(CurrentMemoryContext,
+ "minmax-multi context",
+ ALLOCSET_DEFAULT_SIZES);
+
+ oldctx = MemoryContextSwitchTo(ctx);
+
+ /* OK build the combine ranges */
+ cranges = build_combine_ranges(cmpFn, ranges->colloid, ranges,
+ false, (Datum) 0, &ncranges,
+ true); /* deduplicate */
+
+ /* build array of gap distances and sort them in ascending order */
+ distances = build_distances(distanceFn, ranges->colloid, cranges, ncranges);
+
+ /*
+ * Combine ranges until we get below max_values. We don't use any scale
+ * factor, because this is used at the very end of "batch mode" and we
+ * don't expect more tuples to be inserted soon.
+ */
+ ncranges = reduce_combine_ranges(cranges, ncranges, distances,
+ max_values, cmpFn, ranges->colloid);
+
+ Assert(count_values(cranges, ncranges) <= max_values);
+
+ /* decompose the combine ranges into regular ranges and single values */
+ store_combine_ranges(ranges, cranges, ncranges);
+
+ MemoryContextSwitchTo(oldctx);
+ MemoryContextDelete(ctx);
+
+ /* Check the ordering invariants are not violated (for both parts). */
+ AssertArrayOrder(cmpFn, ranges->colloid, ranges->values, ranges->nranges*2);
+ AssertArrayOrder(cmpFn, ranges->colloid, &ranges->values[ranges->nranges*2],
+ ranges->nvalues);
+}
+
Datum
brin_minmax_multi_opcinfo(PG_FUNCTION_ARGS)
{
@@ -1799,10 +1944,16 @@ brin_minmax_multi_distance_inet(PG_FUNCTION_ARGS)
}
static void
-brin_minmax_multi_serialize(Datum src, Datum *dst)
+brin_minmax_multi_serialize(BrinDesc *bdesc, Datum src, Datum *dst)
{
Ranges *ranges = (Ranges *) DatumGetPointer(src);
- SerializedRanges *s = range_serialize(ranges);
+ SerializedRanges *s;
+
+ /* In batch mode, we need to compress the accumulated values. */
+ if (ranges->batch_mode)
+ compactify_ranges(bdesc, ranges, ranges->target_maxvalues);
+
+ s = range_serialize(ranges);
dst[0] = PointerGetDatum(s);
}
@@ -1845,15 +1996,28 @@ brin_minmax_multi_add_value(PG_FUNCTION_ARGS)
/*
* If this is the first non-null value, we need to initialize the range
* list. Otherwise just extract the existing range list from BrinValues.
+ *
+ * When starting with an empty range, we assume this is a batch mode,
+ * i.e. we size the buffer for the maximum possible number of items in
+ * the range (based on range size and max number of items on a page).
+ *
+ * XXX This may require quite a bit of memory, so maybe we should use
+ * some value in between. OTOH most tables will have much wider rows,
+ * so the number of rows per page is much lower.
*/
if (column->bv_allnulls)
{
MemoryContext oldctx;
- oldctx = MemoryContextSwitchTo(column->bv_context);
+ BlockNumber pagesPerRange = BrinGetPagesPerRange(bdesc->bd_index);
- ranges = minmax_multi_init(brin_minmax_multi_get_values(bdesc, opts));
+ oldctx = MemoryContextSwitchTo(column->bv_context);
+ ranges = minmax_multi_init(MaxHeapTuplesPerPage * pagesPerRange);
+ ranges->attno = attno;
+ ranges->colloid = colloid;
ranges->typid = attr->atttypid;
+ ranges->batch_mode = true;
+ ranges->target_maxvalues = brin_minmax_multi_get_values(bdesc, opts);
MemoryContextSwitchTo(oldctx);
@@ -2125,7 +2289,7 @@ brin_minmax_multi_union(PG_FUNCTION_ARGS)
oldctx = MemoryContextSwitchTo(ctx);
/* allocate and fill */
- cranges = (CombineRange *)palloc0(ncranges * sizeof(CombineRange));
+ cranges = (CombineRange *) palloc0(ncranges * sizeof(CombineRange));
/* fill the combine ranges with entries for the first range */
fill_combine_ranges(cranges, ranges_a->nranges + ranges_a->nvalues,
@@ -2139,8 +2303,8 @@ brin_minmax_multi_union(PG_FUNCTION_ARGS)
cmpFn = minmax_multi_get_strategy_procinfo(bdesc, attno, attr->atttypid,
BTLessStrategyNumber);
- /* sort the combine ranges */
- sort_combine_ranges(cmpFn, colloid, cranges, ncranges);
+ /* sort the combine ranges (don't deduplicate) */
+ sort_combine_ranges(cmpFn, colloid, cranges, ncranges, false);
/*
* We've merged two different lists of ranges, so some of them may be
diff --git a/src/backend/access/brin/brin_tuple.c b/src/backend/access/brin/brin_tuple.c
index df820db029..bf8635d788 100644
--- a/src/backend/access/brin/brin_tuple.c
+++ b/src/backend/access/brin/brin_tuple.c
@@ -163,6 +163,7 @@ brin_form_tuple(BrinDesc *brdesc, BlockNumber blkno, BrinMemTuple *tuple,
if (tuple->bt_columns[keyno].bv_serialize)
{
tuple->bt_columns[keyno].bv_serialize(
+ brdesc,
tuple->bt_columns[keyno].bv_mem_value,
tuple->bt_columns[keyno].bv_values);
}
diff --git a/src/include/access/brin_tuple.h b/src/include/access/brin_tuple.h
index 66a6c3c792..e08998b71a 100644
--- a/src/include/access/brin_tuple.h
+++ b/src/include/access/brin_tuple.h
@@ -14,7 +14,7 @@
#include "access/brin_internal.h"
#include "access/tupdesc.h"
-typedef void (*brin_serialize_callback_type) (Datum src, Datum * dst);
+typedef void (*brin_serialize_callback_type) (BrinDesc *bdesc, Datum src, Datum * dst);
/*
* A BRIN index stores one index tuple per page range. Each index tuple
--
2.26.2
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--------------FA974B75A0C3E9CA18CE7207--
^ permalink raw reply [nested|flat] 29+ messages in thread
* [PATCH 8/8] batch build
@ 2021-01-22 00:11 Tomas Vondra <[email protected]>
0 siblings, 0 replies; 29+ messages in thread
From: Tomas Vondra @ 2021-01-22 00:11 UTC (permalink / raw)
---
src/backend/access/brin/brin_minmax_multi.c | 204 ++++++++++++++++++--
src/backend/access/brin/brin_tuple.c | 1 +
src/include/access/brin_tuple.h | 2 +-
3 files changed, 186 insertions(+), 21 deletions(-)
diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 094ecd2be9..72cca6f26b 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -57,6 +57,7 @@
#include "access/brin.h"
#include "access/brin_internal.h"
#include "access/brin_tuple.h"
+#include "access/hash.h" /* XXX strange that it fails because of BRIN_AM_OID without this */
#include "access/reloptions.h"
#include "access/stratnum.h"
#include "access/htup_details.h"
@@ -150,12 +151,23 @@ typedef struct MinMaxOptions
typedef struct Ranges
{
Oid typid;
+ Oid colloid;
+ AttrNumber attno;
/* (2*nranges + nvalues) <= maxvalues */
int nranges; /* number of ranges in the array (stored) */
int nvalues; /* number of values in the data array (all) */
int maxvalues; /* maximum number of values (reloption) */
+ /*
+ * Batch mode means we're simply appending values into new range,
+ * without any expensive steps (sorting, deduplication, ...). The
+ * buffer is sized to be much larger, but we keep the actual target
+ * size so that when serializing values we can do the right thing.
+ */
+ bool batch_mode;
+ int target_maxvalues;
+
/* values stored for this range - either raw values, or ranges */
Datum values[FLEXIBLE_ARRAY_MEMBER];
} Ranges;
@@ -375,6 +387,7 @@ range_deserialize(SerializedRanges *serialized)
range->nvalues = serialized->nvalues;
range->maxvalues = serialized->maxvalues;
range->typid = serialized->typid;
+ range->batch_mode = false;
typbyval = get_typbyval(serialized->typid);
typlen = get_typlen(serialized->typid);
@@ -844,11 +857,14 @@ fill_combine_ranges(CombineRange *cranges, int ncranges, Ranges *ranges)
/*
* Sort combine ranges using qsort (with BTLessStrategyNumber function).
*/
-static void
+static int
sort_combine_ranges(FmgrInfo *cmp, Oid colloid,
- CombineRange *cranges, int ncranges)
+ CombineRange *cranges, int ncranges,
+ bool deduplicate)
{
- compare_context cxt;
+ int n;
+ int i;
+ compare_context cxt;
/* sort the values */
cxt.colloid = colloid;
@@ -856,6 +872,24 @@ sort_combine_ranges(FmgrInfo *cmp, Oid colloid,
qsort_arg(cranges, ncranges, sizeof(CombineRange),
compare_combine_ranges, (void *) &cxt);
+
+ if (!deduplicate)
+ return ncranges;
+
+ /* optionally deduplicate the ranges */
+ n = 1;
+ for (i = 1; i < ncranges; i++)
+ {
+ if (compare_combine_ranges(&cranges[i-1], &cranges[i], (void *) &cxt))
+ {
+ if (i != n)
+ memcpy(&cranges[n], &cranges[i], sizeof(CombineRange));
+
+ n++;
+ }
+ }
+
+ return n;
}
/*
@@ -1026,26 +1060,40 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
*/
static CombineRange *
build_combine_ranges(FmgrInfo *cmp, Oid colloid, Ranges *ranges,
- Datum newvalue, int *nranges)
+ bool addvalue, Datum newvalue, int *nranges,
+ bool deduplicate)
{
int ncranges;
CombineRange *cranges;
/* now do the actual merge sort */
- ncranges = ranges->nranges + ranges->nvalues + 1;
+ ncranges = ranges->nranges + ranges->nvalues;
+
+ /* should we add an extra value? */
+ if (addvalue)
+ ncranges += 1;
+
cranges = (CombineRange *) palloc0(ncranges * sizeof(CombineRange));
- *nranges = ncranges;
/* put the new value at the beginning */
- cranges[0].minval = newvalue;
- cranges[0].maxval = newvalue;
- cranges[0].collapsed = true;
+ if (addvalue)
+ {
+ cranges[0].minval = newvalue;
+ cranges[0].maxval = newvalue;
+ cranges[0].collapsed = true;
- /* then the regular and collapsed ranges */
- fill_combine_ranges(&cranges[1], ncranges-1, ranges);
+ /* then the regular and collapsed ranges */
+ fill_combine_ranges(&cranges[1], ncranges-1, ranges);
+ }
+ else
+ fill_combine_ranges(cranges, ncranges, ranges);
/* and sort the ranges */
- sort_combine_ranges(cmp, colloid, cranges, ncranges);
+ ncranges = sort_combine_ranges(cmp, colloid, cranges, ncranges,
+ deduplicate);
+
+ /* remember how many cranges we built */
+ *nranges = ncranges;
return cranges;
}
@@ -1074,6 +1122,7 @@ count_values(CombineRange *cranges, int ncranges)
}
#endif
+
/*
* reduce_combine_ranges
* reduce the ranges until the number of values is low enough
@@ -1250,6 +1299,25 @@ range_add_value(BrinDesc *bdesc, Oid colloid,
Assert(2*ranges->nranges + ranges->nvalues <= ranges->maxvalues);
+ Assert((ranges->nranges >= 0) && (ranges->nvalues >= 0) && (ranges->maxvalues >= 0));
+
+ /*
+ * When batch-building, there should be no ranges. So either the
+ * number of ranges is 0 or we're not in batching mode.
+ */
+ Assert(!ranges->batch_mode || (ranges->nranges == 0));
+
+ /* When batch-building, just add it and we're done. */
+ if (ranges->batch_mode)
+ {
+ /* there has to be free space, if we've sized the struct */
+ Assert(ranges->nvalues < ranges->maxvalues);
+
+ ranges->values[ranges->nvalues++] = newval;
+
+ return true;
+ }
+
/*
* Bail out if the value already is covered by the range.
*
@@ -1322,7 +1390,9 @@ range_add_value(BrinDesc *bdesc, Oid colloid,
ranges->nvalues);
/* OK build the combine ranges */
- cranges = build_combine_ranges(cmpFn, colloid, ranges, newval, &ncranges);
+ cranges = build_combine_ranges(cmpFn, colloid, ranges,
+ true, newval, &ncranges,
+ false);
/* Reduce the ranges if needed */
if (ncranges > ranges->maxvalues)
@@ -1382,6 +1452,81 @@ range_add_value(BrinDesc *bdesc, Oid colloid,
return true;
}
+/*
+ * Generate range representation of data collected during "batch mode".
+ * This is similar to reduce_combine_ranges, except that we can't assume
+ * the values are sorted and there may be duplicate values.
+ */
+static void
+compactify_ranges(BrinDesc *bdesc, Ranges *ranges, int max_values)
+{
+ FmgrInfo *cmpFn,
+ *distanceFn;
+
+ /* combine ranges */
+ CombineRange *cranges;
+ int ncranges;
+ DistanceValue *distances;
+
+ MemoryContext ctx;
+ MemoryContext oldctx;
+
+ /*
+ * This should only be used in batch mode, and there should be no
+ * ranges, just individual values.
+ */
+ Assert((ranges->batch_mode) && (ranges->nranges == 0));
+
+ /* we'll certainly need the comparator, so just look it up now */
+ cmpFn = minmax_multi_get_strategy_procinfo(bdesc, ranges->attno, ranges->typid,
+ BTLessStrategyNumber);
+
+ /* and we'll also need the 'distance' procedure */
+ distanceFn = minmax_multi_get_procinfo(bdesc, ranges->attno, PROCNUM_DISTANCE);
+
+ /*
+ * The distanceFn calls (which may internally call e.g. numeric_le) may
+ * allocate quite a bit of memory, and we must not leak it. Otherwise
+ * we'd have problems e.g. when building indexes. So we create a local
+ * memory context and make sure we free the memory before leaving this
+ * function (not after every call).
+ */
+ ctx = AllocSetContextCreate(CurrentMemoryContext,
+ "minmax-multi context",
+ ALLOCSET_DEFAULT_SIZES);
+
+ oldctx = MemoryContextSwitchTo(ctx);
+
+ /* OK build the combine ranges */
+ cranges = build_combine_ranges(cmpFn, ranges->colloid, ranges,
+ false, (Datum) 0, &ncranges,
+ true); /* deduplicate */
+
+ /* build array of gap distances and sort them in ascending order */
+ distances = build_distances(distanceFn, ranges->colloid, cranges, ncranges);
+
+ /*
+ * Combine ranges until we get below max_values. We don't use any scale
+ * factor, because this is used at the very end of "batch mode" and we
+ * don't expect more tuples to be inserted soon.
+ */
+ ncranges = reduce_combine_ranges(cranges, ncranges, distances,
+ max_values, cmpFn, ranges->colloid);
+
+ Assert(count_values(cranges, ncranges) <= max_values);
+
+ /* decompose the combine ranges into regular ranges and single values */
+ store_combine_ranges(ranges, cranges, ncranges);
+
+ MemoryContextSwitchTo(oldctx);
+ MemoryContextDelete(ctx);
+
+ /* Check the ordering invariants are not violated (for both parts). */
+ AssertArrayOrder(cmpFn, ranges->colloid, ranges->values, ranges->nranges*2);
+ AssertArrayOrder(cmpFn, ranges->colloid, &ranges->values[ranges->nranges*2],
+ ranges->nvalues);
+}
+
Datum
brin_minmax_multi_opcinfo(PG_FUNCTION_ARGS)
{
@@ -1799,10 +1944,16 @@ brin_minmax_multi_distance_inet(PG_FUNCTION_ARGS)
}
static void
-brin_minmax_multi_serialize(Datum src, Datum *dst)
+brin_minmax_multi_serialize(BrinDesc *bdesc, Datum src, Datum *dst)
{
Ranges *ranges = (Ranges *) DatumGetPointer(src);
- SerializedRanges *s = range_serialize(ranges);
+ SerializedRanges *s;
+
+ /* In batch mode, we need to compress the accumulated values. */
+ if (ranges->batch_mode)
+ compactify_ranges(bdesc, ranges, ranges->target_maxvalues);
+
+ s = range_serialize(ranges);
dst[0] = PointerGetDatum(s);
}
@@ -1845,15 +1996,28 @@ brin_minmax_multi_add_value(PG_FUNCTION_ARGS)
/*
* If this is the first non-null value, we need to initialize the range
* list. Otherwise just extract the existing range list from BrinValues.
+ *
+ * When starting with an empty range, we assume this is a batch mode,
+ * i.e. we size the buffer for the maximum possible number of items in
+ * the range (based on range size and max number of items on a page).
+ *
+ * XXX This may require quite a bit of memory, so maybe we should use
+ * some value in between. OTOH most tables will have much wider rows,
+ * so the number of rows per page is much lower.
*/
if (column->bv_allnulls)
{
MemoryContext oldctx;
- oldctx = MemoryContextSwitchTo(column->bv_context);
+ BlockNumber pagesPerRange = BrinGetPagesPerRange(bdesc->bd_index);
- ranges = minmax_multi_init(brin_minmax_multi_get_values(bdesc, opts));
+ oldctx = MemoryContextSwitchTo(column->bv_context);
+ ranges = minmax_multi_init(MaxHeapTuplesPerPage * pagesPerRange);
+ ranges->attno = attno;
+ ranges->colloid = colloid;
ranges->typid = attr->atttypid;
+ ranges->batch_mode = true;
+ ranges->target_maxvalues = brin_minmax_multi_get_values(bdesc, opts);
MemoryContextSwitchTo(oldctx);
@@ -2125,7 +2289,7 @@ brin_minmax_multi_union(PG_FUNCTION_ARGS)
oldctx = MemoryContextSwitchTo(ctx);
/* allocate and fill */
- cranges = (CombineRange *)palloc0(ncranges * sizeof(CombineRange));
+ cranges = (CombineRange *) palloc0(ncranges * sizeof(CombineRange));
/* fill the combine ranges with entries for the first range */
fill_combine_ranges(cranges, ranges_a->nranges + ranges_a->nvalues,
@@ -2139,8 +2303,8 @@ brin_minmax_multi_union(PG_FUNCTION_ARGS)
cmpFn = minmax_multi_get_strategy_procinfo(bdesc, attno, attr->atttypid,
BTLessStrategyNumber);
- /* sort the combine ranges */
- sort_combine_ranges(cmpFn, colloid, cranges, ncranges);
+ /* sort the combine ranges (don't deduplicate) */
+ sort_combine_ranges(cmpFn, colloid, cranges, ncranges, false);
/*
* We've merged two different lists of ranges, so some of them may be
diff --git a/src/backend/access/brin/brin_tuple.c b/src/backend/access/brin/brin_tuple.c
index df820db029..bf8635d788 100644
--- a/src/backend/access/brin/brin_tuple.c
+++ b/src/backend/access/brin/brin_tuple.c
@@ -163,6 +163,7 @@ brin_form_tuple(BrinDesc *brdesc, BlockNumber blkno, BrinMemTuple *tuple,
if (tuple->bt_columns[keyno].bv_serialize)
{
tuple->bt_columns[keyno].bv_serialize(
+ brdesc,
tuple->bt_columns[keyno].bv_mem_value,
tuple->bt_columns[keyno].bv_values);
}
diff --git a/src/include/access/brin_tuple.h b/src/include/access/brin_tuple.h
index 66a6c3c792..e08998b71a 100644
--- a/src/include/access/brin_tuple.h
+++ b/src/include/access/brin_tuple.h
@@ -14,7 +14,7 @@
#include "access/brin_internal.h"
#include "access/tupdesc.h"
-typedef void (*brin_serialize_callback_type) (Datum src, Datum * dst);
+typedef void (*brin_serialize_callback_type) (BrinDesc *bdesc, Datum src, Datum * dst);
/*
* A BRIN index stores one index tuple per page range. Each index tuple
--
2.26.2
--------------FA974B75A0C3E9CA18CE7207
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--------------FA974B75A0C3E9CA18CE7207--
^ permalink raw reply [nested|flat] 29+ messages in thread
* [PATCH 8/8] batch build
@ 2021-01-22 00:11 Tomas Vondra <[email protected]>
0 siblings, 0 replies; 29+ messages in thread
From: Tomas Vondra @ 2021-01-22 00:11 UTC (permalink / raw)
---
src/backend/access/brin/brin_minmax_multi.c | 204 ++++++++++++++++++--
src/backend/access/brin/brin_tuple.c | 1 +
src/include/access/brin_tuple.h | 2 +-
3 files changed, 186 insertions(+), 21 deletions(-)
diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 094ecd2be9..72cca6f26b 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -57,6 +57,7 @@
#include "access/brin.h"
#include "access/brin_internal.h"
#include "access/brin_tuple.h"
+#include "access/hash.h" /* XXX strange that it fails because of BRIN_AM_OID without this */
#include "access/reloptions.h"
#include "access/stratnum.h"
#include "access/htup_details.h"
@@ -150,12 +151,23 @@ typedef struct MinMaxOptions
typedef struct Ranges
{
Oid typid;
+ Oid colloid;
+ AttrNumber attno;
/* (2*nranges + nvalues) <= maxvalues */
int nranges; /* number of ranges in the array (stored) */
int nvalues; /* number of values in the data array (all) */
int maxvalues; /* maximum number of values (reloption) */
+ /*
+ * Batch mode means we're simply appending values into new range,
+ * without any expensive steps (sorting, deduplication, ...). The
+ * buffer is sized to be much larger, but we keep the actual target
+ * size so that when serializing values we can do the right thing.
+ */
+ bool batch_mode;
+ int target_maxvalues;
+
/* values stored for this range - either raw values, or ranges */
Datum values[FLEXIBLE_ARRAY_MEMBER];
} Ranges;
@@ -375,6 +387,7 @@ range_deserialize(SerializedRanges *serialized)
range->nvalues = serialized->nvalues;
range->maxvalues = serialized->maxvalues;
range->typid = serialized->typid;
+ range->batch_mode = false;
typbyval = get_typbyval(serialized->typid);
typlen = get_typlen(serialized->typid);
@@ -844,11 +857,14 @@ fill_combine_ranges(CombineRange *cranges, int ncranges, Ranges *ranges)
/*
* Sort combine ranges using qsort (with BTLessStrategyNumber function).
*/
-static void
+static int
sort_combine_ranges(FmgrInfo *cmp, Oid colloid,
- CombineRange *cranges, int ncranges)
+ CombineRange *cranges, int ncranges,
+ bool deduplicate)
{
- compare_context cxt;
+ int n;
+ int i;
+ compare_context cxt;
/* sort the values */
cxt.colloid = colloid;
@@ -856,6 +872,24 @@ sort_combine_ranges(FmgrInfo *cmp, Oid colloid,
qsort_arg(cranges, ncranges, sizeof(CombineRange),
compare_combine_ranges, (void *) &cxt);
+
+ if (!deduplicate)
+ return ncranges;
+
+ /* optionally deduplicate the ranges */
+ n = 1;
+ for (i = 1; i < ncranges; i++)
+ {
+ if (compare_combine_ranges(&cranges[i-1], &cranges[i], (void *) &cxt))
+ {
+ if (i != n)
+ memcpy(&cranges[n], &cranges[i], sizeof(CombineRange));
+
+ n++;
+ }
+ }
+
+ return n;
}
/*
@@ -1026,26 +1060,40 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
*/
static CombineRange *
build_combine_ranges(FmgrInfo *cmp, Oid colloid, Ranges *ranges,
- Datum newvalue, int *nranges)
+ bool addvalue, Datum newvalue, int *nranges,
+ bool deduplicate)
{
int ncranges;
CombineRange *cranges;
/* now do the actual merge sort */
- ncranges = ranges->nranges + ranges->nvalues + 1;
+ ncranges = ranges->nranges + ranges->nvalues;
+
+ /* should we add an extra value? */
+ if (addvalue)
+ ncranges += 1;
+
cranges = (CombineRange *) palloc0(ncranges * sizeof(CombineRange));
- *nranges = ncranges;
/* put the new value at the beginning */
- cranges[0].minval = newvalue;
- cranges[0].maxval = newvalue;
- cranges[0].collapsed = true;
+ if (addvalue)
+ {
+ cranges[0].minval = newvalue;
+ cranges[0].maxval = newvalue;
+ cranges[0].collapsed = true;
- /* then the regular and collapsed ranges */
- fill_combine_ranges(&cranges[1], ncranges-1, ranges);
+ /* then the regular and collapsed ranges */
+ fill_combine_ranges(&cranges[1], ncranges-1, ranges);
+ }
+ else
+ fill_combine_ranges(cranges, ncranges, ranges);
/* and sort the ranges */
- sort_combine_ranges(cmp, colloid, cranges, ncranges);
+ ncranges = sort_combine_ranges(cmp, colloid, cranges, ncranges,
+ deduplicate);
+
+ /* remember how many cranges we built */
+ *nranges = ncranges;
return cranges;
}
@@ -1074,6 +1122,7 @@ count_values(CombineRange *cranges, int ncranges)
}
#endif
+
/*
* reduce_combine_ranges
* reduce the ranges until the number of values is low enough
@@ -1250,6 +1299,25 @@ range_add_value(BrinDesc *bdesc, Oid colloid,
Assert(2*ranges->nranges + ranges->nvalues <= ranges->maxvalues);
+ Assert((ranges->nranges >= 0) && (ranges->nvalues >= 0) && (ranges->maxvalues >= 0));
+
+ /*
+ * When batch-building, there should be no ranges. So either the
+ * number of ranges is 0 or we're not in batching mode.
+ */
+ Assert(!ranges->batch_mode || (ranges->nranges == 0));
+
+ /* When batch-building, just add it and we're done. */
+ if (ranges->batch_mode)
+ {
+ /* there has to be free space, if we've sized the struct */
+ Assert(ranges->nvalues < ranges->maxvalues);
+
+ ranges->values[ranges->nvalues++] = newval;
+
+ return true;
+ }
+
/*
* Bail out if the value already is covered by the range.
*
@@ -1322,7 +1390,9 @@ range_add_value(BrinDesc *bdesc, Oid colloid,
ranges->nvalues);
/* OK build the combine ranges */
- cranges = build_combine_ranges(cmpFn, colloid, ranges, newval, &ncranges);
+ cranges = build_combine_ranges(cmpFn, colloid, ranges,
+ true, newval, &ncranges,
+ false);
/* Reduce the ranges if needed */
if (ncranges > ranges->maxvalues)
@@ -1382,6 +1452,81 @@ range_add_value(BrinDesc *bdesc, Oid colloid,
return true;
}
+/*
+ * Generate range representation of data collected during "batch mode".
+ * This is similar to reduce_combine_ranges, except that we can't assume
+ * the values are sorted and there may be duplicate values.
+ */
+static void
+compactify_ranges(BrinDesc *bdesc, Ranges *ranges, int max_values)
+{
+ FmgrInfo *cmpFn,
+ *distanceFn;
+
+ /* combine ranges */
+ CombineRange *cranges;
+ int ncranges;
+ DistanceValue *distances;
+
+ MemoryContext ctx;
+ MemoryContext oldctx;
+
+ /*
+ * This should only be used in batch mode, and there should be no
+ * ranges, just individual values.
+ */
+ Assert((ranges->batch_mode) && (ranges->nranges == 0));
+
+ /* we'll certainly need the comparator, so just look it up now */
+ cmpFn = minmax_multi_get_strategy_procinfo(bdesc, ranges->attno, ranges->typid,
+ BTLessStrategyNumber);
+
+ /* and we'll also need the 'distance' procedure */
+ distanceFn = minmax_multi_get_procinfo(bdesc, ranges->attno, PROCNUM_DISTANCE);
+
+ /*
+ * The distanceFn calls (which may internally call e.g. numeric_le) may
+ * allocate quite a bit of memory, and we must not leak it. Otherwise
+ * we'd have problems e.g. when building indexes. So we create a local
+ * memory context and make sure we free the memory before leaving this
+ * function (not after every call).
+ */
+ ctx = AllocSetContextCreate(CurrentMemoryContext,
+ "minmax-multi context",
+ ALLOCSET_DEFAULT_SIZES);
+
+ oldctx = MemoryContextSwitchTo(ctx);
+
+ /* OK build the combine ranges */
+ cranges = build_combine_ranges(cmpFn, ranges->colloid, ranges,
+ false, (Datum) 0, &ncranges,
+ true); /* deduplicate */
+
+ /* build array of gap distances and sort them in ascending order */
+ distances = build_distances(distanceFn, ranges->colloid, cranges, ncranges);
+
+ /*
+ * Combine ranges until we get below max_values. We don't use any scale
+ * factor, because this is used at the very end of "batch mode" and we
+ * don't expect more tuples to be inserted soon.
+ */
+ ncranges = reduce_combine_ranges(cranges, ncranges, distances,
+ max_values, cmpFn, ranges->colloid);
+
+ Assert(count_values(cranges, ncranges) <= max_values);
+
+ /* decompose the combine ranges into regular ranges and single values */
+ store_combine_ranges(ranges, cranges, ncranges);
+
+ MemoryContextSwitchTo(oldctx);
+ MemoryContextDelete(ctx);
+
+ /* Check the ordering invariants are not violated (for both parts). */
+ AssertArrayOrder(cmpFn, ranges->colloid, ranges->values, ranges->nranges*2);
+ AssertArrayOrder(cmpFn, ranges->colloid, &ranges->values[ranges->nranges*2],
+ ranges->nvalues);
+}
+
Datum
brin_minmax_multi_opcinfo(PG_FUNCTION_ARGS)
{
@@ -1799,10 +1944,16 @@ brin_minmax_multi_distance_inet(PG_FUNCTION_ARGS)
}
static void
-brin_minmax_multi_serialize(Datum src, Datum *dst)
+brin_minmax_multi_serialize(BrinDesc *bdesc, Datum src, Datum *dst)
{
Ranges *ranges = (Ranges *) DatumGetPointer(src);
- SerializedRanges *s = range_serialize(ranges);
+ SerializedRanges *s;
+
+ /* In batch mode, we need to compress the accumulated values. */
+ if (ranges->batch_mode)
+ compactify_ranges(bdesc, ranges, ranges->target_maxvalues);
+
+ s = range_serialize(ranges);
dst[0] = PointerGetDatum(s);
}
@@ -1845,15 +1996,28 @@ brin_minmax_multi_add_value(PG_FUNCTION_ARGS)
/*
* If this is the first non-null value, we need to initialize the range
* list. Otherwise just extract the existing range list from BrinValues.
+ *
+ * When starting with an empty range, we assume this is a batch mode,
+ * i.e. we size the buffer for the maximum possible number of items in
+ * the range (based on range size and max number of items on a page).
+ *
+ * XXX This may require quite a bit of memory, so maybe we should use
+ * some value in between. OTOH most tables will have much wider rows,
+ * so the number of rows per page is much lower.
*/
if (column->bv_allnulls)
{
MemoryContext oldctx;
- oldctx = MemoryContextSwitchTo(column->bv_context);
+ BlockNumber pagesPerRange = BrinGetPagesPerRange(bdesc->bd_index);
- ranges = minmax_multi_init(brin_minmax_multi_get_values(bdesc, opts));
+ oldctx = MemoryContextSwitchTo(column->bv_context);
+ ranges = minmax_multi_init(MaxHeapTuplesPerPage * pagesPerRange);
+ ranges->attno = attno;
+ ranges->colloid = colloid;
ranges->typid = attr->atttypid;
+ ranges->batch_mode = true;
+ ranges->target_maxvalues = brin_minmax_multi_get_values(bdesc, opts);
MemoryContextSwitchTo(oldctx);
@@ -2125,7 +2289,7 @@ brin_minmax_multi_union(PG_FUNCTION_ARGS)
oldctx = MemoryContextSwitchTo(ctx);
/* allocate and fill */
- cranges = (CombineRange *)palloc0(ncranges * sizeof(CombineRange));
+ cranges = (CombineRange *) palloc0(ncranges * sizeof(CombineRange));
/* fill the combine ranges with entries for the first range */
fill_combine_ranges(cranges, ranges_a->nranges + ranges_a->nvalues,
@@ -2139,8 +2303,8 @@ brin_minmax_multi_union(PG_FUNCTION_ARGS)
cmpFn = minmax_multi_get_strategy_procinfo(bdesc, attno, attr->atttypid,
BTLessStrategyNumber);
- /* sort the combine ranges */
- sort_combine_ranges(cmpFn, colloid, cranges, ncranges);
+ /* sort the combine ranges (don't deduplicate) */
+ sort_combine_ranges(cmpFn, colloid, cranges, ncranges, false);
/*
* We've merged two different lists of ranges, so some of them may be
diff --git a/src/backend/access/brin/brin_tuple.c b/src/backend/access/brin/brin_tuple.c
index df820db029..bf8635d788 100644
--- a/src/backend/access/brin/brin_tuple.c
+++ b/src/backend/access/brin/brin_tuple.c
@@ -163,6 +163,7 @@ brin_form_tuple(BrinDesc *brdesc, BlockNumber blkno, BrinMemTuple *tuple,
if (tuple->bt_columns[keyno].bv_serialize)
{
tuple->bt_columns[keyno].bv_serialize(
+ brdesc,
tuple->bt_columns[keyno].bv_mem_value,
tuple->bt_columns[keyno].bv_values);
}
diff --git a/src/include/access/brin_tuple.h b/src/include/access/brin_tuple.h
index 66a6c3c792..e08998b71a 100644
--- a/src/include/access/brin_tuple.h
+++ b/src/include/access/brin_tuple.h
@@ -14,7 +14,7 @@
#include "access/brin_internal.h"
#include "access/tupdesc.h"
-typedef void (*brin_serialize_callback_type) (Datum src, Datum * dst);
+typedef void (*brin_serialize_callback_type) (BrinDesc *bdesc, Datum src, Datum * dst);
/*
* A BRIN index stores one index tuple per page range. Each index tuple
--
2.26.2
--------------FA974B75A0C3E9CA18CE7207
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name="brin.sh"
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Content-Disposition: attachment;
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--------------FA974B75A0C3E9CA18CE7207--
^ permalink raw reply [nested|flat] 29+ messages in thread
* [PATCH 8/8] batch build
@ 2021-01-22 00:11 Tomas Vondra <[email protected]>
0 siblings, 0 replies; 29+ messages in thread
From: Tomas Vondra @ 2021-01-22 00:11 UTC (permalink / raw)
---
src/backend/access/brin/brin_minmax_multi.c | 204 ++++++++++++++++++--
src/backend/access/brin/brin_tuple.c | 1 +
src/include/access/brin_tuple.h | 2 +-
3 files changed, 186 insertions(+), 21 deletions(-)
diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 094ecd2be9..72cca6f26b 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -57,6 +57,7 @@
#include "access/brin.h"
#include "access/brin_internal.h"
#include "access/brin_tuple.h"
+#include "access/hash.h" /* XXX strange that it fails because of BRIN_AM_OID without this */
#include "access/reloptions.h"
#include "access/stratnum.h"
#include "access/htup_details.h"
@@ -150,12 +151,23 @@ typedef struct MinMaxOptions
typedef struct Ranges
{
Oid typid;
+ Oid colloid;
+ AttrNumber attno;
/* (2*nranges + nvalues) <= maxvalues */
int nranges; /* number of ranges in the array (stored) */
int nvalues; /* number of values in the data array (all) */
int maxvalues; /* maximum number of values (reloption) */
+ /*
+ * Batch mode means we're simply appending values into new range,
+ * without any expensive steps (sorting, deduplication, ...). The
+ * buffer is sized to be much larger, but we keep the actual target
+ * size so that when serializing values we can do the right thing.
+ */
+ bool batch_mode;
+ int target_maxvalues;
+
/* values stored for this range - either raw values, or ranges */
Datum values[FLEXIBLE_ARRAY_MEMBER];
} Ranges;
@@ -375,6 +387,7 @@ range_deserialize(SerializedRanges *serialized)
range->nvalues = serialized->nvalues;
range->maxvalues = serialized->maxvalues;
range->typid = serialized->typid;
+ range->batch_mode = false;
typbyval = get_typbyval(serialized->typid);
typlen = get_typlen(serialized->typid);
@@ -844,11 +857,14 @@ fill_combine_ranges(CombineRange *cranges, int ncranges, Ranges *ranges)
/*
* Sort combine ranges using qsort (with BTLessStrategyNumber function).
*/
-static void
+static int
sort_combine_ranges(FmgrInfo *cmp, Oid colloid,
- CombineRange *cranges, int ncranges)
+ CombineRange *cranges, int ncranges,
+ bool deduplicate)
{
- compare_context cxt;
+ int n;
+ int i;
+ compare_context cxt;
/* sort the values */
cxt.colloid = colloid;
@@ -856,6 +872,24 @@ sort_combine_ranges(FmgrInfo *cmp, Oid colloid,
qsort_arg(cranges, ncranges, sizeof(CombineRange),
compare_combine_ranges, (void *) &cxt);
+
+ if (!deduplicate)
+ return ncranges;
+
+ /* optionally deduplicate the ranges */
+ n = 1;
+ for (i = 1; i < ncranges; i++)
+ {
+ if (compare_combine_ranges(&cranges[i-1], &cranges[i], (void *) &cxt))
+ {
+ if (i != n)
+ memcpy(&cranges[n], &cranges[i], sizeof(CombineRange));
+
+ n++;
+ }
+ }
+
+ return n;
}
/*
@@ -1026,26 +1060,40 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
*/
static CombineRange *
build_combine_ranges(FmgrInfo *cmp, Oid colloid, Ranges *ranges,
- Datum newvalue, int *nranges)
+ bool addvalue, Datum newvalue, int *nranges,
+ bool deduplicate)
{
int ncranges;
CombineRange *cranges;
/* now do the actual merge sort */
- ncranges = ranges->nranges + ranges->nvalues + 1;
+ ncranges = ranges->nranges + ranges->nvalues;
+
+ /* should we add an extra value? */
+ if (addvalue)
+ ncranges += 1;
+
cranges = (CombineRange *) palloc0(ncranges * sizeof(CombineRange));
- *nranges = ncranges;
/* put the new value at the beginning */
- cranges[0].minval = newvalue;
- cranges[0].maxval = newvalue;
- cranges[0].collapsed = true;
+ if (addvalue)
+ {
+ cranges[0].minval = newvalue;
+ cranges[0].maxval = newvalue;
+ cranges[0].collapsed = true;
- /* then the regular and collapsed ranges */
- fill_combine_ranges(&cranges[1], ncranges-1, ranges);
+ /* then the regular and collapsed ranges */
+ fill_combine_ranges(&cranges[1], ncranges-1, ranges);
+ }
+ else
+ fill_combine_ranges(cranges, ncranges, ranges);
/* and sort the ranges */
- sort_combine_ranges(cmp, colloid, cranges, ncranges);
+ ncranges = sort_combine_ranges(cmp, colloid, cranges, ncranges,
+ deduplicate);
+
+ /* remember how many cranges we built */
+ *nranges = ncranges;
return cranges;
}
@@ -1074,6 +1122,7 @@ count_values(CombineRange *cranges, int ncranges)
}
#endif
+
/*
* reduce_combine_ranges
* reduce the ranges until the number of values is low enough
@@ -1250,6 +1299,25 @@ range_add_value(BrinDesc *bdesc, Oid colloid,
Assert(2*ranges->nranges + ranges->nvalues <= ranges->maxvalues);
+ Assert((ranges->nranges >= 0) && (ranges->nvalues >= 0) && (ranges->maxvalues >= 0));
+
+ /*
+ * When batch-building, there should be no ranges. So either the
+ * number of ranges is 0 or we're not in batching mode.
+ */
+ Assert(!ranges->batch_mode || (ranges->nranges == 0));
+
+ /* When batch-building, just add it and we're done. */
+ if (ranges->batch_mode)
+ {
+ /* there has to be free space, if we've sized the struct */
+ Assert(ranges->nvalues < ranges->maxvalues);
+
+ ranges->values[ranges->nvalues++] = newval;
+
+ return true;
+ }
+
/*
* Bail out if the value already is covered by the range.
*
@@ -1322,7 +1390,9 @@ range_add_value(BrinDesc *bdesc, Oid colloid,
ranges->nvalues);
/* OK build the combine ranges */
- cranges = build_combine_ranges(cmpFn, colloid, ranges, newval, &ncranges);
+ cranges = build_combine_ranges(cmpFn, colloid, ranges,
+ true, newval, &ncranges,
+ false);
/* Reduce the ranges if needed */
if (ncranges > ranges->maxvalues)
@@ -1382,6 +1452,81 @@ range_add_value(BrinDesc *bdesc, Oid colloid,
return true;
}
+/*
+ * Generate range representation of data collected during "batch mode".
+ * This is similar to reduce_combine_ranges, except that we can't assume
+ * the values are sorted and there may be duplicate values.
+ */
+static void
+compactify_ranges(BrinDesc *bdesc, Ranges *ranges, int max_values)
+{
+ FmgrInfo *cmpFn,
+ *distanceFn;
+
+ /* combine ranges */
+ CombineRange *cranges;
+ int ncranges;
+ DistanceValue *distances;
+
+ MemoryContext ctx;
+ MemoryContext oldctx;
+
+ /*
+ * This should only be used in batch mode, and there should be no
+ * ranges, just individual values.
+ */
+ Assert((ranges->batch_mode) && (ranges->nranges == 0));
+
+ /* we'll certainly need the comparator, so just look it up now */
+ cmpFn = minmax_multi_get_strategy_procinfo(bdesc, ranges->attno, ranges->typid,
+ BTLessStrategyNumber);
+
+ /* and we'll also need the 'distance' procedure */
+ distanceFn = minmax_multi_get_procinfo(bdesc, ranges->attno, PROCNUM_DISTANCE);
+
+ /*
+ * The distanceFn calls (which may internally call e.g. numeric_le) may
+ * allocate quite a bit of memory, and we must not leak it. Otherwise
+ * we'd have problems e.g. when building indexes. So we create a local
+ * memory context and make sure we free the memory before leaving this
+ * function (not after every call).
+ */
+ ctx = AllocSetContextCreate(CurrentMemoryContext,
+ "minmax-multi context",
+ ALLOCSET_DEFAULT_SIZES);
+
+ oldctx = MemoryContextSwitchTo(ctx);
+
+ /* OK build the combine ranges */
+ cranges = build_combine_ranges(cmpFn, ranges->colloid, ranges,
+ false, (Datum) 0, &ncranges,
+ true); /* deduplicate */
+
+ /* build array of gap distances and sort them in ascending order */
+ distances = build_distances(distanceFn, ranges->colloid, cranges, ncranges);
+
+ /*
+ * Combine ranges until we get below max_values. We don't use any scale
+ * factor, because this is used at the very end of "batch mode" and we
+ * don't expect more tuples to be inserted soon.
+ */
+ ncranges = reduce_combine_ranges(cranges, ncranges, distances,
+ max_values, cmpFn, ranges->colloid);
+
+ Assert(count_values(cranges, ncranges) <= max_values);
+
+ /* decompose the combine ranges into regular ranges and single values */
+ store_combine_ranges(ranges, cranges, ncranges);
+
+ MemoryContextSwitchTo(oldctx);
+ MemoryContextDelete(ctx);
+
+ /* Check the ordering invariants are not violated (for both parts). */
+ AssertArrayOrder(cmpFn, ranges->colloid, ranges->values, ranges->nranges*2);
+ AssertArrayOrder(cmpFn, ranges->colloid, &ranges->values[ranges->nranges*2],
+ ranges->nvalues);
+}
+
Datum
brin_minmax_multi_opcinfo(PG_FUNCTION_ARGS)
{
@@ -1799,10 +1944,16 @@ brin_minmax_multi_distance_inet(PG_FUNCTION_ARGS)
}
static void
-brin_minmax_multi_serialize(Datum src, Datum *dst)
+brin_minmax_multi_serialize(BrinDesc *bdesc, Datum src, Datum *dst)
{
Ranges *ranges = (Ranges *) DatumGetPointer(src);
- SerializedRanges *s = range_serialize(ranges);
+ SerializedRanges *s;
+
+ /* In batch mode, we need to compress the accumulated values. */
+ if (ranges->batch_mode)
+ compactify_ranges(bdesc, ranges, ranges->target_maxvalues);
+
+ s = range_serialize(ranges);
dst[0] = PointerGetDatum(s);
}
@@ -1845,15 +1996,28 @@ brin_minmax_multi_add_value(PG_FUNCTION_ARGS)
/*
* If this is the first non-null value, we need to initialize the range
* list. Otherwise just extract the existing range list from BrinValues.
+ *
+ * When starting with an empty range, we assume this is a batch mode,
+ * i.e. we size the buffer for the maximum possible number of items in
+ * the range (based on range size and max number of items on a page).
+ *
+ * XXX This may require quite a bit of memory, so maybe we should use
+ * some value in between. OTOH most tables will have much wider rows,
+ * so the number of rows per page is much lower.
*/
if (column->bv_allnulls)
{
MemoryContext oldctx;
- oldctx = MemoryContextSwitchTo(column->bv_context);
+ BlockNumber pagesPerRange = BrinGetPagesPerRange(bdesc->bd_index);
- ranges = minmax_multi_init(brin_minmax_multi_get_values(bdesc, opts));
+ oldctx = MemoryContextSwitchTo(column->bv_context);
+ ranges = minmax_multi_init(MaxHeapTuplesPerPage * pagesPerRange);
+ ranges->attno = attno;
+ ranges->colloid = colloid;
ranges->typid = attr->atttypid;
+ ranges->batch_mode = true;
+ ranges->target_maxvalues = brin_minmax_multi_get_values(bdesc, opts);
MemoryContextSwitchTo(oldctx);
@@ -2125,7 +2289,7 @@ brin_minmax_multi_union(PG_FUNCTION_ARGS)
oldctx = MemoryContextSwitchTo(ctx);
/* allocate and fill */
- cranges = (CombineRange *)palloc0(ncranges * sizeof(CombineRange));
+ cranges = (CombineRange *) palloc0(ncranges * sizeof(CombineRange));
/* fill the combine ranges with entries for the first range */
fill_combine_ranges(cranges, ranges_a->nranges + ranges_a->nvalues,
@@ -2139,8 +2303,8 @@ brin_minmax_multi_union(PG_FUNCTION_ARGS)
cmpFn = minmax_multi_get_strategy_procinfo(bdesc, attno, attr->atttypid,
BTLessStrategyNumber);
- /* sort the combine ranges */
- sort_combine_ranges(cmpFn, colloid, cranges, ncranges);
+ /* sort the combine ranges (don't deduplicate) */
+ sort_combine_ranges(cmpFn, colloid, cranges, ncranges, false);
/*
* We've merged two different lists of ranges, so some of them may be
diff --git a/src/backend/access/brin/brin_tuple.c b/src/backend/access/brin/brin_tuple.c
index df820db029..bf8635d788 100644
--- a/src/backend/access/brin/brin_tuple.c
+++ b/src/backend/access/brin/brin_tuple.c
@@ -163,6 +163,7 @@ brin_form_tuple(BrinDesc *brdesc, BlockNumber blkno, BrinMemTuple *tuple,
if (tuple->bt_columns[keyno].bv_serialize)
{
tuple->bt_columns[keyno].bv_serialize(
+ brdesc,
tuple->bt_columns[keyno].bv_mem_value,
tuple->bt_columns[keyno].bv_values);
}
diff --git a/src/include/access/brin_tuple.h b/src/include/access/brin_tuple.h
index 66a6c3c792..e08998b71a 100644
--- a/src/include/access/brin_tuple.h
+++ b/src/include/access/brin_tuple.h
@@ -14,7 +14,7 @@
#include "access/brin_internal.h"
#include "access/tupdesc.h"
-typedef void (*brin_serialize_callback_type) (Datum src, Datum * dst);
+typedef void (*brin_serialize_callback_type) (BrinDesc *bdesc, Datum src, Datum * dst);
/*
* A BRIN index stores one index tuple per page range. Each index tuple
--
2.26.2
--------------FA974B75A0C3E9CA18CE7207
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--------------FA974B75A0C3E9CA18CE7207--
^ permalink raw reply [nested|flat] 29+ messages in thread
* [PATCH 8/8] batch build
@ 2021-01-22 00:11 Tomas Vondra <[email protected]>
0 siblings, 0 replies; 29+ messages in thread
From: Tomas Vondra @ 2021-01-22 00:11 UTC (permalink / raw)
---
src/backend/access/brin/brin_minmax_multi.c | 204 ++++++++++++++++++--
src/backend/access/brin/brin_tuple.c | 1 +
src/include/access/brin_tuple.h | 2 +-
3 files changed, 186 insertions(+), 21 deletions(-)
diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 094ecd2be9..72cca6f26b 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -57,6 +57,7 @@
#include "access/brin.h"
#include "access/brin_internal.h"
#include "access/brin_tuple.h"
+#include "access/hash.h" /* XXX strange that it fails because of BRIN_AM_OID without this */
#include "access/reloptions.h"
#include "access/stratnum.h"
#include "access/htup_details.h"
@@ -150,12 +151,23 @@ typedef struct MinMaxOptions
typedef struct Ranges
{
Oid typid;
+ Oid colloid;
+ AttrNumber attno;
/* (2*nranges + nvalues) <= maxvalues */
int nranges; /* number of ranges in the array (stored) */
int nvalues; /* number of values in the data array (all) */
int maxvalues; /* maximum number of values (reloption) */
+ /*
+ * Batch mode means we're simply appending values into new range,
+ * without any expensive steps (sorting, deduplication, ...). The
+ * buffer is sized to be much larger, but we keep the actual target
+ * size so that when serializing values we can do the right thing.
+ */
+ bool batch_mode;
+ int target_maxvalues;
+
/* values stored for this range - either raw values, or ranges */
Datum values[FLEXIBLE_ARRAY_MEMBER];
} Ranges;
@@ -375,6 +387,7 @@ range_deserialize(SerializedRanges *serialized)
range->nvalues = serialized->nvalues;
range->maxvalues = serialized->maxvalues;
range->typid = serialized->typid;
+ range->batch_mode = false;
typbyval = get_typbyval(serialized->typid);
typlen = get_typlen(serialized->typid);
@@ -844,11 +857,14 @@ fill_combine_ranges(CombineRange *cranges, int ncranges, Ranges *ranges)
/*
* Sort combine ranges using qsort (with BTLessStrategyNumber function).
*/
-static void
+static int
sort_combine_ranges(FmgrInfo *cmp, Oid colloid,
- CombineRange *cranges, int ncranges)
+ CombineRange *cranges, int ncranges,
+ bool deduplicate)
{
- compare_context cxt;
+ int n;
+ int i;
+ compare_context cxt;
/* sort the values */
cxt.colloid = colloid;
@@ -856,6 +872,24 @@ sort_combine_ranges(FmgrInfo *cmp, Oid colloid,
qsort_arg(cranges, ncranges, sizeof(CombineRange),
compare_combine_ranges, (void *) &cxt);
+
+ if (!deduplicate)
+ return ncranges;
+
+ /* optionally deduplicate the ranges */
+ n = 1;
+ for (i = 1; i < ncranges; i++)
+ {
+ if (compare_combine_ranges(&cranges[i-1], &cranges[i], (void *) &cxt))
+ {
+ if (i != n)
+ memcpy(&cranges[n], &cranges[i], sizeof(CombineRange));
+
+ n++;
+ }
+ }
+
+ return n;
}
/*
@@ -1026,26 +1060,40 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
*/
static CombineRange *
build_combine_ranges(FmgrInfo *cmp, Oid colloid, Ranges *ranges,
- Datum newvalue, int *nranges)
+ bool addvalue, Datum newvalue, int *nranges,
+ bool deduplicate)
{
int ncranges;
CombineRange *cranges;
/* now do the actual merge sort */
- ncranges = ranges->nranges + ranges->nvalues + 1;
+ ncranges = ranges->nranges + ranges->nvalues;
+
+ /* should we add an extra value? */
+ if (addvalue)
+ ncranges += 1;
+
cranges = (CombineRange *) palloc0(ncranges * sizeof(CombineRange));
- *nranges = ncranges;
/* put the new value at the beginning */
- cranges[0].minval = newvalue;
- cranges[0].maxval = newvalue;
- cranges[0].collapsed = true;
+ if (addvalue)
+ {
+ cranges[0].minval = newvalue;
+ cranges[0].maxval = newvalue;
+ cranges[0].collapsed = true;
- /* then the regular and collapsed ranges */
- fill_combine_ranges(&cranges[1], ncranges-1, ranges);
+ /* then the regular and collapsed ranges */
+ fill_combine_ranges(&cranges[1], ncranges-1, ranges);
+ }
+ else
+ fill_combine_ranges(cranges, ncranges, ranges);
/* and sort the ranges */
- sort_combine_ranges(cmp, colloid, cranges, ncranges);
+ ncranges = sort_combine_ranges(cmp, colloid, cranges, ncranges,
+ deduplicate);
+
+ /* remember how many cranges we built */
+ *nranges = ncranges;
return cranges;
}
@@ -1074,6 +1122,7 @@ count_values(CombineRange *cranges, int ncranges)
}
#endif
+
/*
* reduce_combine_ranges
* reduce the ranges until the number of values is low enough
@@ -1250,6 +1299,25 @@ range_add_value(BrinDesc *bdesc, Oid colloid,
Assert(2*ranges->nranges + ranges->nvalues <= ranges->maxvalues);
+ Assert((ranges->nranges >= 0) && (ranges->nvalues >= 0) && (ranges->maxvalues >= 0));
+
+ /*
+ * When batch-building, there should be no ranges. So either the
+ * number of ranges is 0 or we're not in batching mode.
+ */
+ Assert(!ranges->batch_mode || (ranges->nranges == 0));
+
+ /* When batch-building, just add it and we're done. */
+ if (ranges->batch_mode)
+ {
+ /* there has to be free space, if we've sized the struct */
+ Assert(ranges->nvalues < ranges->maxvalues);
+
+ ranges->values[ranges->nvalues++] = newval;
+
+ return true;
+ }
+
/*
* Bail out if the value already is covered by the range.
*
@@ -1322,7 +1390,9 @@ range_add_value(BrinDesc *bdesc, Oid colloid,
ranges->nvalues);
/* OK build the combine ranges */
- cranges = build_combine_ranges(cmpFn, colloid, ranges, newval, &ncranges);
+ cranges = build_combine_ranges(cmpFn, colloid, ranges,
+ true, newval, &ncranges,
+ false);
/* Reduce the ranges if needed */
if (ncranges > ranges->maxvalues)
@@ -1382,6 +1452,81 @@ range_add_value(BrinDesc *bdesc, Oid colloid,
return true;
}
+/*
+ * Generate range representation of data collected during "batch mode".
+ * This is similar to reduce_combine_ranges, except that we can't assume
+ * the values are sorted and there may be duplicate values.
+ */
+static void
+compactify_ranges(BrinDesc *bdesc, Ranges *ranges, int max_values)
+{
+ FmgrInfo *cmpFn,
+ *distanceFn;
+
+ /* combine ranges */
+ CombineRange *cranges;
+ int ncranges;
+ DistanceValue *distances;
+
+ MemoryContext ctx;
+ MemoryContext oldctx;
+
+ /*
+ * This should only be used in batch mode, and there should be no
+ * ranges, just individual values.
+ */
+ Assert((ranges->batch_mode) && (ranges->nranges == 0));
+
+ /* we'll certainly need the comparator, so just look it up now */
+ cmpFn = minmax_multi_get_strategy_procinfo(bdesc, ranges->attno, ranges->typid,
+ BTLessStrategyNumber);
+
+ /* and we'll also need the 'distance' procedure */
+ distanceFn = minmax_multi_get_procinfo(bdesc, ranges->attno, PROCNUM_DISTANCE);
+
+ /*
+ * The distanceFn calls (which may internally call e.g. numeric_le) may
+ * allocate quite a bit of memory, and we must not leak it. Otherwise
+ * we'd have problems e.g. when building indexes. So we create a local
+ * memory context and make sure we free the memory before leaving this
+ * function (not after every call).
+ */
+ ctx = AllocSetContextCreate(CurrentMemoryContext,
+ "minmax-multi context",
+ ALLOCSET_DEFAULT_SIZES);
+
+ oldctx = MemoryContextSwitchTo(ctx);
+
+ /* OK build the combine ranges */
+ cranges = build_combine_ranges(cmpFn, ranges->colloid, ranges,
+ false, (Datum) 0, &ncranges,
+ true); /* deduplicate */
+
+ /* build array of gap distances and sort them in ascending order */
+ distances = build_distances(distanceFn, ranges->colloid, cranges, ncranges);
+
+ /*
+ * Combine ranges until we get below max_values. We don't use any scale
+ * factor, because this is used at the very end of "batch mode" and we
+ * don't expect more tuples to be inserted soon.
+ */
+ ncranges = reduce_combine_ranges(cranges, ncranges, distances,
+ max_values, cmpFn, ranges->colloid);
+
+ Assert(count_values(cranges, ncranges) <= max_values);
+
+ /* decompose the combine ranges into regular ranges and single values */
+ store_combine_ranges(ranges, cranges, ncranges);
+
+ MemoryContextSwitchTo(oldctx);
+ MemoryContextDelete(ctx);
+
+ /* Check the ordering invariants are not violated (for both parts). */
+ AssertArrayOrder(cmpFn, ranges->colloid, ranges->values, ranges->nranges*2);
+ AssertArrayOrder(cmpFn, ranges->colloid, &ranges->values[ranges->nranges*2],
+ ranges->nvalues);
+}
+
Datum
brin_minmax_multi_opcinfo(PG_FUNCTION_ARGS)
{
@@ -1799,10 +1944,16 @@ brin_minmax_multi_distance_inet(PG_FUNCTION_ARGS)
}
static void
-brin_minmax_multi_serialize(Datum src, Datum *dst)
+brin_minmax_multi_serialize(BrinDesc *bdesc, Datum src, Datum *dst)
{
Ranges *ranges = (Ranges *) DatumGetPointer(src);
- SerializedRanges *s = range_serialize(ranges);
+ SerializedRanges *s;
+
+ /* In batch mode, we need to compress the accumulated values. */
+ if (ranges->batch_mode)
+ compactify_ranges(bdesc, ranges, ranges->target_maxvalues);
+
+ s = range_serialize(ranges);
dst[0] = PointerGetDatum(s);
}
@@ -1845,15 +1996,28 @@ brin_minmax_multi_add_value(PG_FUNCTION_ARGS)
/*
* If this is the first non-null value, we need to initialize the range
* list. Otherwise just extract the existing range list from BrinValues.
+ *
+ * When starting with an empty range, we assume this is a batch mode,
+ * i.e. we size the buffer for the maximum possible number of items in
+ * the range (based on range size and max number of items on a page).
+ *
+ * XXX This may require quite a bit of memory, so maybe we should use
+ * some value in between. OTOH most tables will have much wider rows,
+ * so the number of rows per page is much lower.
*/
if (column->bv_allnulls)
{
MemoryContext oldctx;
- oldctx = MemoryContextSwitchTo(column->bv_context);
+ BlockNumber pagesPerRange = BrinGetPagesPerRange(bdesc->bd_index);
- ranges = minmax_multi_init(brin_minmax_multi_get_values(bdesc, opts));
+ oldctx = MemoryContextSwitchTo(column->bv_context);
+ ranges = minmax_multi_init(MaxHeapTuplesPerPage * pagesPerRange);
+ ranges->attno = attno;
+ ranges->colloid = colloid;
ranges->typid = attr->atttypid;
+ ranges->batch_mode = true;
+ ranges->target_maxvalues = brin_minmax_multi_get_values(bdesc, opts);
MemoryContextSwitchTo(oldctx);
@@ -2125,7 +2289,7 @@ brin_minmax_multi_union(PG_FUNCTION_ARGS)
oldctx = MemoryContextSwitchTo(ctx);
/* allocate and fill */
- cranges = (CombineRange *)palloc0(ncranges * sizeof(CombineRange));
+ cranges = (CombineRange *) palloc0(ncranges * sizeof(CombineRange));
/* fill the combine ranges with entries for the first range */
fill_combine_ranges(cranges, ranges_a->nranges + ranges_a->nvalues,
@@ -2139,8 +2303,8 @@ brin_minmax_multi_union(PG_FUNCTION_ARGS)
cmpFn = minmax_multi_get_strategy_procinfo(bdesc, attno, attr->atttypid,
BTLessStrategyNumber);
- /* sort the combine ranges */
- sort_combine_ranges(cmpFn, colloid, cranges, ncranges);
+ /* sort the combine ranges (don't deduplicate) */
+ sort_combine_ranges(cmpFn, colloid, cranges, ncranges, false);
/*
* We've merged two different lists of ranges, so some of them may be
diff --git a/src/backend/access/brin/brin_tuple.c b/src/backend/access/brin/brin_tuple.c
index df820db029..bf8635d788 100644
--- a/src/backend/access/brin/brin_tuple.c
+++ b/src/backend/access/brin/brin_tuple.c
@@ -163,6 +163,7 @@ brin_form_tuple(BrinDesc *brdesc, BlockNumber blkno, BrinMemTuple *tuple,
if (tuple->bt_columns[keyno].bv_serialize)
{
tuple->bt_columns[keyno].bv_serialize(
+ brdesc,
tuple->bt_columns[keyno].bv_mem_value,
tuple->bt_columns[keyno].bv_values);
}
diff --git a/src/include/access/brin_tuple.h b/src/include/access/brin_tuple.h
index 66a6c3c792..e08998b71a 100644
--- a/src/include/access/brin_tuple.h
+++ b/src/include/access/brin_tuple.h
@@ -14,7 +14,7 @@
#include "access/brin_internal.h"
#include "access/tupdesc.h"
-typedef void (*brin_serialize_callback_type) (Datum src, Datum * dst);
+typedef void (*brin_serialize_callback_type) (BrinDesc *bdesc, Datum src, Datum * dst);
/*
* A BRIN index stores one index tuple per page range. Each index tuple
--
2.26.2
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--------------FA974B75A0C3E9CA18CE7207--
^ permalink raw reply [nested|flat] 29+ messages in thread
* [PATCH 8/8] batch build
@ 2021-01-22 00:11 Tomas Vondra <[email protected]>
0 siblings, 0 replies; 29+ messages in thread
From: Tomas Vondra @ 2021-01-22 00:11 UTC (permalink / raw)
---
src/backend/access/brin/brin_minmax_multi.c | 204 ++++++++++++++++++--
src/backend/access/brin/brin_tuple.c | 1 +
src/include/access/brin_tuple.h | 2 +-
3 files changed, 186 insertions(+), 21 deletions(-)
diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 094ecd2be9..72cca6f26b 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -57,6 +57,7 @@
#include "access/brin.h"
#include "access/brin_internal.h"
#include "access/brin_tuple.h"
+#include "access/hash.h" /* XXX strange that it fails because of BRIN_AM_OID without this */
#include "access/reloptions.h"
#include "access/stratnum.h"
#include "access/htup_details.h"
@@ -150,12 +151,23 @@ typedef struct MinMaxOptions
typedef struct Ranges
{
Oid typid;
+ Oid colloid;
+ AttrNumber attno;
/* (2*nranges + nvalues) <= maxvalues */
int nranges; /* number of ranges in the array (stored) */
int nvalues; /* number of values in the data array (all) */
int maxvalues; /* maximum number of values (reloption) */
+ /*
+ * Batch mode means we're simply appending values into new range,
+ * without any expensive steps (sorting, deduplication, ...). The
+ * buffer is sized to be much larger, but we keep the actual target
+ * size so that when serializing values we can do the right thing.
+ */
+ bool batch_mode;
+ int target_maxvalues;
+
/* values stored for this range - either raw values, or ranges */
Datum values[FLEXIBLE_ARRAY_MEMBER];
} Ranges;
@@ -375,6 +387,7 @@ range_deserialize(SerializedRanges *serialized)
range->nvalues = serialized->nvalues;
range->maxvalues = serialized->maxvalues;
range->typid = serialized->typid;
+ range->batch_mode = false;
typbyval = get_typbyval(serialized->typid);
typlen = get_typlen(serialized->typid);
@@ -844,11 +857,14 @@ fill_combine_ranges(CombineRange *cranges, int ncranges, Ranges *ranges)
/*
* Sort combine ranges using qsort (with BTLessStrategyNumber function).
*/
-static void
+static int
sort_combine_ranges(FmgrInfo *cmp, Oid colloid,
- CombineRange *cranges, int ncranges)
+ CombineRange *cranges, int ncranges,
+ bool deduplicate)
{
- compare_context cxt;
+ int n;
+ int i;
+ compare_context cxt;
/* sort the values */
cxt.colloid = colloid;
@@ -856,6 +872,24 @@ sort_combine_ranges(FmgrInfo *cmp, Oid colloid,
qsort_arg(cranges, ncranges, sizeof(CombineRange),
compare_combine_ranges, (void *) &cxt);
+
+ if (!deduplicate)
+ return ncranges;
+
+ /* optionally deduplicate the ranges */
+ n = 1;
+ for (i = 1; i < ncranges; i++)
+ {
+ if (compare_combine_ranges(&cranges[i-1], &cranges[i], (void *) &cxt))
+ {
+ if (i != n)
+ memcpy(&cranges[n], &cranges[i], sizeof(CombineRange));
+
+ n++;
+ }
+ }
+
+ return n;
}
/*
@@ -1026,26 +1060,40 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
*/
static CombineRange *
build_combine_ranges(FmgrInfo *cmp, Oid colloid, Ranges *ranges,
- Datum newvalue, int *nranges)
+ bool addvalue, Datum newvalue, int *nranges,
+ bool deduplicate)
{
int ncranges;
CombineRange *cranges;
/* now do the actual merge sort */
- ncranges = ranges->nranges + ranges->nvalues + 1;
+ ncranges = ranges->nranges + ranges->nvalues;
+
+ /* should we add an extra value? */
+ if (addvalue)
+ ncranges += 1;
+
cranges = (CombineRange *) palloc0(ncranges * sizeof(CombineRange));
- *nranges = ncranges;
/* put the new value at the beginning */
- cranges[0].minval = newvalue;
- cranges[0].maxval = newvalue;
- cranges[0].collapsed = true;
+ if (addvalue)
+ {
+ cranges[0].minval = newvalue;
+ cranges[0].maxval = newvalue;
+ cranges[0].collapsed = true;
- /* then the regular and collapsed ranges */
- fill_combine_ranges(&cranges[1], ncranges-1, ranges);
+ /* then the regular and collapsed ranges */
+ fill_combine_ranges(&cranges[1], ncranges-1, ranges);
+ }
+ else
+ fill_combine_ranges(cranges, ncranges, ranges);
/* and sort the ranges */
- sort_combine_ranges(cmp, colloid, cranges, ncranges);
+ ncranges = sort_combine_ranges(cmp, colloid, cranges, ncranges,
+ deduplicate);
+
+ /* remember how many cranges we built */
+ *nranges = ncranges;
return cranges;
}
@@ -1074,6 +1122,7 @@ count_values(CombineRange *cranges, int ncranges)
}
#endif
+
/*
* reduce_combine_ranges
* reduce the ranges until the number of values is low enough
@@ -1250,6 +1299,25 @@ range_add_value(BrinDesc *bdesc, Oid colloid,
Assert(2*ranges->nranges + ranges->nvalues <= ranges->maxvalues);
+ Assert((ranges->nranges >= 0) && (ranges->nvalues >= 0) && (ranges->maxvalues >= 0));
+
+ /*
+ * When batch-building, there should be no ranges. So either the
+ * number of ranges is 0 or we're not in batching mode.
+ */
+ Assert(!ranges->batch_mode || (ranges->nranges == 0));
+
+ /* When batch-building, just add it and we're done. */
+ if (ranges->batch_mode)
+ {
+ /* there has to be free space, if we've sized the struct */
+ Assert(ranges->nvalues < ranges->maxvalues);
+
+ ranges->values[ranges->nvalues++] = newval;
+
+ return true;
+ }
+
/*
* Bail out if the value already is covered by the range.
*
@@ -1322,7 +1390,9 @@ range_add_value(BrinDesc *bdesc, Oid colloid,
ranges->nvalues);
/* OK build the combine ranges */
- cranges = build_combine_ranges(cmpFn, colloid, ranges, newval, &ncranges);
+ cranges = build_combine_ranges(cmpFn, colloid, ranges,
+ true, newval, &ncranges,
+ false);
/* Reduce the ranges if needed */
if (ncranges > ranges->maxvalues)
@@ -1382,6 +1452,81 @@ range_add_value(BrinDesc *bdesc, Oid colloid,
return true;
}
+/*
+ * Generate range representation of data collected during "batch mode".
+ * This is similar to reduce_combine_ranges, except that we can't assume
+ * the values are sorted and there may be duplicate values.
+ */
+static void
+compactify_ranges(BrinDesc *bdesc, Ranges *ranges, int max_values)
+{
+ FmgrInfo *cmpFn,
+ *distanceFn;
+
+ /* combine ranges */
+ CombineRange *cranges;
+ int ncranges;
+ DistanceValue *distances;
+
+ MemoryContext ctx;
+ MemoryContext oldctx;
+
+ /*
+ * This should only be used in batch mode, and there should be no
+ * ranges, just individual values.
+ */
+ Assert((ranges->batch_mode) && (ranges->nranges == 0));
+
+ /* we'll certainly need the comparator, so just look it up now */
+ cmpFn = minmax_multi_get_strategy_procinfo(bdesc, ranges->attno, ranges->typid,
+ BTLessStrategyNumber);
+
+ /* and we'll also need the 'distance' procedure */
+ distanceFn = minmax_multi_get_procinfo(bdesc, ranges->attno, PROCNUM_DISTANCE);
+
+ /*
+ * The distanceFn calls (which may internally call e.g. numeric_le) may
+ * allocate quite a bit of memory, and we must not leak it. Otherwise
+ * we'd have problems e.g. when building indexes. So we create a local
+ * memory context and make sure we free the memory before leaving this
+ * function (not after every call).
+ */
+ ctx = AllocSetContextCreate(CurrentMemoryContext,
+ "minmax-multi context",
+ ALLOCSET_DEFAULT_SIZES);
+
+ oldctx = MemoryContextSwitchTo(ctx);
+
+ /* OK build the combine ranges */
+ cranges = build_combine_ranges(cmpFn, ranges->colloid, ranges,
+ false, (Datum) 0, &ncranges,
+ true); /* deduplicate */
+
+ /* build array of gap distances and sort them in ascending order */
+ distances = build_distances(distanceFn, ranges->colloid, cranges, ncranges);
+
+ /*
+ * Combine ranges until we get below max_values. We don't use any scale
+ * factor, because this is used at the very end of "batch mode" and we
+ * don't expect more tuples to be inserted soon.
+ */
+ ncranges = reduce_combine_ranges(cranges, ncranges, distances,
+ max_values, cmpFn, ranges->colloid);
+
+ Assert(count_values(cranges, ncranges) <= max_values);
+
+ /* decompose the combine ranges into regular ranges and single values */
+ store_combine_ranges(ranges, cranges, ncranges);
+
+ MemoryContextSwitchTo(oldctx);
+ MemoryContextDelete(ctx);
+
+ /* Check the ordering invariants are not violated (for both parts). */
+ AssertArrayOrder(cmpFn, ranges->colloid, ranges->values, ranges->nranges*2);
+ AssertArrayOrder(cmpFn, ranges->colloid, &ranges->values[ranges->nranges*2],
+ ranges->nvalues);
+}
+
Datum
brin_minmax_multi_opcinfo(PG_FUNCTION_ARGS)
{
@@ -1799,10 +1944,16 @@ brin_minmax_multi_distance_inet(PG_FUNCTION_ARGS)
}
static void
-brin_minmax_multi_serialize(Datum src, Datum *dst)
+brin_minmax_multi_serialize(BrinDesc *bdesc, Datum src, Datum *dst)
{
Ranges *ranges = (Ranges *) DatumGetPointer(src);
- SerializedRanges *s = range_serialize(ranges);
+ SerializedRanges *s;
+
+ /* In batch mode, we need to compress the accumulated values. */
+ if (ranges->batch_mode)
+ compactify_ranges(bdesc, ranges, ranges->target_maxvalues);
+
+ s = range_serialize(ranges);
dst[0] = PointerGetDatum(s);
}
@@ -1845,15 +1996,28 @@ brin_minmax_multi_add_value(PG_FUNCTION_ARGS)
/*
* If this is the first non-null value, we need to initialize the range
* list. Otherwise just extract the existing range list from BrinValues.
+ *
+ * When starting with an empty range, we assume this is a batch mode,
+ * i.e. we size the buffer for the maximum possible number of items in
+ * the range (based on range size and max number of items on a page).
+ *
+ * XXX This may require quite a bit of memory, so maybe we should use
+ * some value in between. OTOH most tables will have much wider rows,
+ * so the number of rows per page is much lower.
*/
if (column->bv_allnulls)
{
MemoryContext oldctx;
- oldctx = MemoryContextSwitchTo(column->bv_context);
+ BlockNumber pagesPerRange = BrinGetPagesPerRange(bdesc->bd_index);
- ranges = minmax_multi_init(brin_minmax_multi_get_values(bdesc, opts));
+ oldctx = MemoryContextSwitchTo(column->bv_context);
+ ranges = minmax_multi_init(MaxHeapTuplesPerPage * pagesPerRange);
+ ranges->attno = attno;
+ ranges->colloid = colloid;
ranges->typid = attr->atttypid;
+ ranges->batch_mode = true;
+ ranges->target_maxvalues = brin_minmax_multi_get_values(bdesc, opts);
MemoryContextSwitchTo(oldctx);
@@ -2125,7 +2289,7 @@ brin_minmax_multi_union(PG_FUNCTION_ARGS)
oldctx = MemoryContextSwitchTo(ctx);
/* allocate and fill */
- cranges = (CombineRange *)palloc0(ncranges * sizeof(CombineRange));
+ cranges = (CombineRange *) palloc0(ncranges * sizeof(CombineRange));
/* fill the combine ranges with entries for the first range */
fill_combine_ranges(cranges, ranges_a->nranges + ranges_a->nvalues,
@@ -2139,8 +2303,8 @@ brin_minmax_multi_union(PG_FUNCTION_ARGS)
cmpFn = minmax_multi_get_strategy_procinfo(bdesc, attno, attr->atttypid,
BTLessStrategyNumber);
- /* sort the combine ranges */
- sort_combine_ranges(cmpFn, colloid, cranges, ncranges);
+ /* sort the combine ranges (don't deduplicate) */
+ sort_combine_ranges(cmpFn, colloid, cranges, ncranges, false);
/*
* We've merged two different lists of ranges, so some of them may be
diff --git a/src/backend/access/brin/brin_tuple.c b/src/backend/access/brin/brin_tuple.c
index df820db029..bf8635d788 100644
--- a/src/backend/access/brin/brin_tuple.c
+++ b/src/backend/access/brin/brin_tuple.c
@@ -163,6 +163,7 @@ brin_form_tuple(BrinDesc *brdesc, BlockNumber blkno, BrinMemTuple *tuple,
if (tuple->bt_columns[keyno].bv_serialize)
{
tuple->bt_columns[keyno].bv_serialize(
+ brdesc,
tuple->bt_columns[keyno].bv_mem_value,
tuple->bt_columns[keyno].bv_values);
}
diff --git a/src/include/access/brin_tuple.h b/src/include/access/brin_tuple.h
index 66a6c3c792..e08998b71a 100644
--- a/src/include/access/brin_tuple.h
+++ b/src/include/access/brin_tuple.h
@@ -14,7 +14,7 @@
#include "access/brin_internal.h"
#include "access/tupdesc.h"
-typedef void (*brin_serialize_callback_type) (Datum src, Datum * dst);
+typedef void (*brin_serialize_callback_type) (BrinDesc *bdesc, Datum src, Datum * dst);
/*
* A BRIN index stores one index tuple per page range. Each index tuple
--
2.26.2
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--------------FA974B75A0C3E9CA18CE7207--
^ permalink raw reply [nested|flat] 29+ messages in thread
* [PATCH 8/8] batch build
@ 2021-01-22 00:11 Tomas Vondra <[email protected]>
0 siblings, 0 replies; 29+ messages in thread
From: Tomas Vondra @ 2021-01-22 00:11 UTC (permalink / raw)
---
src/backend/access/brin/brin_minmax_multi.c | 204 ++++++++++++++++++--
src/backend/access/brin/brin_tuple.c | 1 +
src/include/access/brin_tuple.h | 2 +-
3 files changed, 186 insertions(+), 21 deletions(-)
diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 094ecd2be9..72cca6f26b 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -57,6 +57,7 @@
#include "access/brin.h"
#include "access/brin_internal.h"
#include "access/brin_tuple.h"
+#include "access/hash.h" /* XXX strange that it fails because of BRIN_AM_OID without this */
#include "access/reloptions.h"
#include "access/stratnum.h"
#include "access/htup_details.h"
@@ -150,12 +151,23 @@ typedef struct MinMaxOptions
typedef struct Ranges
{
Oid typid;
+ Oid colloid;
+ AttrNumber attno;
/* (2*nranges + nvalues) <= maxvalues */
int nranges; /* number of ranges in the array (stored) */
int nvalues; /* number of values in the data array (all) */
int maxvalues; /* maximum number of values (reloption) */
+ /*
+ * Batch mode means we're simply appending values into new range,
+ * without any expensive steps (sorting, deduplication, ...). The
+ * buffer is sized to be much larger, but we keep the actual target
+ * size so that when serializing values we can do the right thing.
+ */
+ bool batch_mode;
+ int target_maxvalues;
+
/* values stored for this range - either raw values, or ranges */
Datum values[FLEXIBLE_ARRAY_MEMBER];
} Ranges;
@@ -375,6 +387,7 @@ range_deserialize(SerializedRanges *serialized)
range->nvalues = serialized->nvalues;
range->maxvalues = serialized->maxvalues;
range->typid = serialized->typid;
+ range->batch_mode = false;
typbyval = get_typbyval(serialized->typid);
typlen = get_typlen(serialized->typid);
@@ -844,11 +857,14 @@ fill_combine_ranges(CombineRange *cranges, int ncranges, Ranges *ranges)
/*
* Sort combine ranges using qsort (with BTLessStrategyNumber function).
*/
-static void
+static int
sort_combine_ranges(FmgrInfo *cmp, Oid colloid,
- CombineRange *cranges, int ncranges)
+ CombineRange *cranges, int ncranges,
+ bool deduplicate)
{
- compare_context cxt;
+ int n;
+ int i;
+ compare_context cxt;
/* sort the values */
cxt.colloid = colloid;
@@ -856,6 +872,24 @@ sort_combine_ranges(FmgrInfo *cmp, Oid colloid,
qsort_arg(cranges, ncranges, sizeof(CombineRange),
compare_combine_ranges, (void *) &cxt);
+
+ if (!deduplicate)
+ return ncranges;
+
+ /* optionally deduplicate the ranges */
+ n = 1;
+ for (i = 1; i < ncranges; i++)
+ {
+ if (compare_combine_ranges(&cranges[i-1], &cranges[i], (void *) &cxt))
+ {
+ if (i != n)
+ memcpy(&cranges[n], &cranges[i], sizeof(CombineRange));
+
+ n++;
+ }
+ }
+
+ return n;
}
/*
@@ -1026,26 +1060,40 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
*/
static CombineRange *
build_combine_ranges(FmgrInfo *cmp, Oid colloid, Ranges *ranges,
- Datum newvalue, int *nranges)
+ bool addvalue, Datum newvalue, int *nranges,
+ bool deduplicate)
{
int ncranges;
CombineRange *cranges;
/* now do the actual merge sort */
- ncranges = ranges->nranges + ranges->nvalues + 1;
+ ncranges = ranges->nranges + ranges->nvalues;
+
+ /* should we add an extra value? */
+ if (addvalue)
+ ncranges += 1;
+
cranges = (CombineRange *) palloc0(ncranges * sizeof(CombineRange));
- *nranges = ncranges;
/* put the new value at the beginning */
- cranges[0].minval = newvalue;
- cranges[0].maxval = newvalue;
- cranges[0].collapsed = true;
+ if (addvalue)
+ {
+ cranges[0].minval = newvalue;
+ cranges[0].maxval = newvalue;
+ cranges[0].collapsed = true;
- /* then the regular and collapsed ranges */
- fill_combine_ranges(&cranges[1], ncranges-1, ranges);
+ /* then the regular and collapsed ranges */
+ fill_combine_ranges(&cranges[1], ncranges-1, ranges);
+ }
+ else
+ fill_combine_ranges(cranges, ncranges, ranges);
/* and sort the ranges */
- sort_combine_ranges(cmp, colloid, cranges, ncranges);
+ ncranges = sort_combine_ranges(cmp, colloid, cranges, ncranges,
+ deduplicate);
+
+ /* remember how many cranges we built */
+ *nranges = ncranges;
return cranges;
}
@@ -1074,6 +1122,7 @@ count_values(CombineRange *cranges, int ncranges)
}
#endif
+
/*
* reduce_combine_ranges
* reduce the ranges until the number of values is low enough
@@ -1250,6 +1299,25 @@ range_add_value(BrinDesc *bdesc, Oid colloid,
Assert(2*ranges->nranges + ranges->nvalues <= ranges->maxvalues);
+ Assert((ranges->nranges >= 0) && (ranges->nvalues >= 0) && (ranges->maxvalues >= 0));
+
+ /*
+ * When batch-building, there should be no ranges. So either the
+ * number of ranges is 0 or we're not in batching mode.
+ */
+ Assert(!ranges->batch_mode || (ranges->nranges == 0));
+
+ /* When batch-building, just add it and we're done. */
+ if (ranges->batch_mode)
+ {
+ /* there has to be free space, if we've sized the struct */
+ Assert(ranges->nvalues < ranges->maxvalues);
+
+ ranges->values[ranges->nvalues++] = newval;
+
+ return true;
+ }
+
/*
* Bail out if the value already is covered by the range.
*
@@ -1322,7 +1390,9 @@ range_add_value(BrinDesc *bdesc, Oid colloid,
ranges->nvalues);
/* OK build the combine ranges */
- cranges = build_combine_ranges(cmpFn, colloid, ranges, newval, &ncranges);
+ cranges = build_combine_ranges(cmpFn, colloid, ranges,
+ true, newval, &ncranges,
+ false);
/* Reduce the ranges if needed */
if (ncranges > ranges->maxvalues)
@@ -1382,6 +1452,81 @@ range_add_value(BrinDesc *bdesc, Oid colloid,
return true;
}
+/*
+ * Generate range representation of data collected during "batch mode".
+ * This is similar to reduce_combine_ranges, except that we can't assume
+ * the values are sorted and there may be duplicate values.
+ */
+static void
+compactify_ranges(BrinDesc *bdesc, Ranges *ranges, int max_values)
+{
+ FmgrInfo *cmpFn,
+ *distanceFn;
+
+ /* combine ranges */
+ CombineRange *cranges;
+ int ncranges;
+ DistanceValue *distances;
+
+ MemoryContext ctx;
+ MemoryContext oldctx;
+
+ /*
+ * This should only be used in batch mode, and there should be no
+ * ranges, just individual values.
+ */
+ Assert((ranges->batch_mode) && (ranges->nranges == 0));
+
+ /* we'll certainly need the comparator, so just look it up now */
+ cmpFn = minmax_multi_get_strategy_procinfo(bdesc, ranges->attno, ranges->typid,
+ BTLessStrategyNumber);
+
+ /* and we'll also need the 'distance' procedure */
+ distanceFn = minmax_multi_get_procinfo(bdesc, ranges->attno, PROCNUM_DISTANCE);
+
+ /*
+ * The distanceFn calls (which may internally call e.g. numeric_le) may
+ * allocate quite a bit of memory, and we must not leak it. Otherwise
+ * we'd have problems e.g. when building indexes. So we create a local
+ * memory context and make sure we free the memory before leaving this
+ * function (not after every call).
+ */
+ ctx = AllocSetContextCreate(CurrentMemoryContext,
+ "minmax-multi context",
+ ALLOCSET_DEFAULT_SIZES);
+
+ oldctx = MemoryContextSwitchTo(ctx);
+
+ /* OK build the combine ranges */
+ cranges = build_combine_ranges(cmpFn, ranges->colloid, ranges,
+ false, (Datum) 0, &ncranges,
+ true); /* deduplicate */
+
+ /* build array of gap distances and sort them in ascending order */
+ distances = build_distances(distanceFn, ranges->colloid, cranges, ncranges);
+
+ /*
+ * Combine ranges until we get below max_values. We don't use any scale
+ * factor, because this is used at the very end of "batch mode" and we
+ * don't expect more tuples to be inserted soon.
+ */
+ ncranges = reduce_combine_ranges(cranges, ncranges, distances,
+ max_values, cmpFn, ranges->colloid);
+
+ Assert(count_values(cranges, ncranges) <= max_values);
+
+ /* decompose the combine ranges into regular ranges and single values */
+ store_combine_ranges(ranges, cranges, ncranges);
+
+ MemoryContextSwitchTo(oldctx);
+ MemoryContextDelete(ctx);
+
+ /* Check the ordering invariants are not violated (for both parts). */
+ AssertArrayOrder(cmpFn, ranges->colloid, ranges->values, ranges->nranges*2);
+ AssertArrayOrder(cmpFn, ranges->colloid, &ranges->values[ranges->nranges*2],
+ ranges->nvalues);
+}
+
Datum
brin_minmax_multi_opcinfo(PG_FUNCTION_ARGS)
{
@@ -1799,10 +1944,16 @@ brin_minmax_multi_distance_inet(PG_FUNCTION_ARGS)
}
static void
-brin_minmax_multi_serialize(Datum src, Datum *dst)
+brin_minmax_multi_serialize(BrinDesc *bdesc, Datum src, Datum *dst)
{
Ranges *ranges = (Ranges *) DatumGetPointer(src);
- SerializedRanges *s = range_serialize(ranges);
+ SerializedRanges *s;
+
+ /* In batch mode, we need to compress the accumulated values. */
+ if (ranges->batch_mode)
+ compactify_ranges(bdesc, ranges, ranges->target_maxvalues);
+
+ s = range_serialize(ranges);
dst[0] = PointerGetDatum(s);
}
@@ -1845,15 +1996,28 @@ brin_minmax_multi_add_value(PG_FUNCTION_ARGS)
/*
* If this is the first non-null value, we need to initialize the range
* list. Otherwise just extract the existing range list from BrinValues.
+ *
+ * When starting with an empty range, we assume this is a batch mode,
+ * i.e. we size the buffer for the maximum possible number of items in
+ * the range (based on range size and max number of items on a page).
+ *
+ * XXX This may require quite a bit of memory, so maybe we should use
+ * some value in between. OTOH most tables will have much wider rows,
+ * so the number of rows per page is much lower.
*/
if (column->bv_allnulls)
{
MemoryContext oldctx;
- oldctx = MemoryContextSwitchTo(column->bv_context);
+ BlockNumber pagesPerRange = BrinGetPagesPerRange(bdesc->bd_index);
- ranges = minmax_multi_init(brin_minmax_multi_get_values(bdesc, opts));
+ oldctx = MemoryContextSwitchTo(column->bv_context);
+ ranges = minmax_multi_init(MaxHeapTuplesPerPage * pagesPerRange);
+ ranges->attno = attno;
+ ranges->colloid = colloid;
ranges->typid = attr->atttypid;
+ ranges->batch_mode = true;
+ ranges->target_maxvalues = brin_minmax_multi_get_values(bdesc, opts);
MemoryContextSwitchTo(oldctx);
@@ -2125,7 +2289,7 @@ brin_minmax_multi_union(PG_FUNCTION_ARGS)
oldctx = MemoryContextSwitchTo(ctx);
/* allocate and fill */
- cranges = (CombineRange *)palloc0(ncranges * sizeof(CombineRange));
+ cranges = (CombineRange *) palloc0(ncranges * sizeof(CombineRange));
/* fill the combine ranges with entries for the first range */
fill_combine_ranges(cranges, ranges_a->nranges + ranges_a->nvalues,
@@ -2139,8 +2303,8 @@ brin_minmax_multi_union(PG_FUNCTION_ARGS)
cmpFn = minmax_multi_get_strategy_procinfo(bdesc, attno, attr->atttypid,
BTLessStrategyNumber);
- /* sort the combine ranges */
- sort_combine_ranges(cmpFn, colloid, cranges, ncranges);
+ /* sort the combine ranges (don't deduplicate) */
+ sort_combine_ranges(cmpFn, colloid, cranges, ncranges, false);
/*
* We've merged two different lists of ranges, so some of them may be
diff --git a/src/backend/access/brin/brin_tuple.c b/src/backend/access/brin/brin_tuple.c
index df820db029..bf8635d788 100644
--- a/src/backend/access/brin/brin_tuple.c
+++ b/src/backend/access/brin/brin_tuple.c
@@ -163,6 +163,7 @@ brin_form_tuple(BrinDesc *brdesc, BlockNumber blkno, BrinMemTuple *tuple,
if (tuple->bt_columns[keyno].bv_serialize)
{
tuple->bt_columns[keyno].bv_serialize(
+ brdesc,
tuple->bt_columns[keyno].bv_mem_value,
tuple->bt_columns[keyno].bv_values);
}
diff --git a/src/include/access/brin_tuple.h b/src/include/access/brin_tuple.h
index 66a6c3c792..e08998b71a 100644
--- a/src/include/access/brin_tuple.h
+++ b/src/include/access/brin_tuple.h
@@ -14,7 +14,7 @@
#include "access/brin_internal.h"
#include "access/tupdesc.h"
-typedef void (*brin_serialize_callback_type) (Datum src, Datum * dst);
+typedef void (*brin_serialize_callback_type) (BrinDesc *bdesc, Datum src, Datum * dst);
/*
* A BRIN index stores one index tuple per page range. Each index tuple
--
2.26.2
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--------------FA974B75A0C3E9CA18CE7207--
^ permalink raw reply [nested|flat] 29+ messages in thread
* [PATCH 8/8] batch build
@ 2021-01-22 00:11 Tomas Vondra <[email protected]>
0 siblings, 0 replies; 29+ messages in thread
From: Tomas Vondra @ 2021-01-22 00:11 UTC (permalink / raw)
---
src/backend/access/brin/brin_minmax_multi.c | 204 ++++++++++++++++++--
src/backend/access/brin/brin_tuple.c | 1 +
src/include/access/brin_tuple.h | 2 +-
3 files changed, 186 insertions(+), 21 deletions(-)
diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 094ecd2be9..72cca6f26b 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -57,6 +57,7 @@
#include "access/brin.h"
#include "access/brin_internal.h"
#include "access/brin_tuple.h"
+#include "access/hash.h" /* XXX strange that it fails because of BRIN_AM_OID without this */
#include "access/reloptions.h"
#include "access/stratnum.h"
#include "access/htup_details.h"
@@ -150,12 +151,23 @@ typedef struct MinMaxOptions
typedef struct Ranges
{
Oid typid;
+ Oid colloid;
+ AttrNumber attno;
/* (2*nranges + nvalues) <= maxvalues */
int nranges; /* number of ranges in the array (stored) */
int nvalues; /* number of values in the data array (all) */
int maxvalues; /* maximum number of values (reloption) */
+ /*
+ * Batch mode means we're simply appending values into new range,
+ * without any expensive steps (sorting, deduplication, ...). The
+ * buffer is sized to be much larger, but we keep the actual target
+ * size so that when serializing values we can do the right thing.
+ */
+ bool batch_mode;
+ int target_maxvalues;
+
/* values stored for this range - either raw values, or ranges */
Datum values[FLEXIBLE_ARRAY_MEMBER];
} Ranges;
@@ -375,6 +387,7 @@ range_deserialize(SerializedRanges *serialized)
range->nvalues = serialized->nvalues;
range->maxvalues = serialized->maxvalues;
range->typid = serialized->typid;
+ range->batch_mode = false;
typbyval = get_typbyval(serialized->typid);
typlen = get_typlen(serialized->typid);
@@ -844,11 +857,14 @@ fill_combine_ranges(CombineRange *cranges, int ncranges, Ranges *ranges)
/*
* Sort combine ranges using qsort (with BTLessStrategyNumber function).
*/
-static void
+static int
sort_combine_ranges(FmgrInfo *cmp, Oid colloid,
- CombineRange *cranges, int ncranges)
+ CombineRange *cranges, int ncranges,
+ bool deduplicate)
{
- compare_context cxt;
+ int n;
+ int i;
+ compare_context cxt;
/* sort the values */
cxt.colloid = colloid;
@@ -856,6 +872,24 @@ sort_combine_ranges(FmgrInfo *cmp, Oid colloid,
qsort_arg(cranges, ncranges, sizeof(CombineRange),
compare_combine_ranges, (void *) &cxt);
+
+ if (!deduplicate)
+ return ncranges;
+
+ /* optionally deduplicate the ranges */
+ n = 1;
+ for (i = 1; i < ncranges; i++)
+ {
+ if (compare_combine_ranges(&cranges[i-1], &cranges[i], (void *) &cxt))
+ {
+ if (i != n)
+ memcpy(&cranges[n], &cranges[i], sizeof(CombineRange));
+
+ n++;
+ }
+ }
+
+ return n;
}
/*
@@ -1026,26 +1060,40 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
*/
static CombineRange *
build_combine_ranges(FmgrInfo *cmp, Oid colloid, Ranges *ranges,
- Datum newvalue, int *nranges)
+ bool addvalue, Datum newvalue, int *nranges,
+ bool deduplicate)
{
int ncranges;
CombineRange *cranges;
/* now do the actual merge sort */
- ncranges = ranges->nranges + ranges->nvalues + 1;
+ ncranges = ranges->nranges + ranges->nvalues;
+
+ /* should we add an extra value? */
+ if (addvalue)
+ ncranges += 1;
+
cranges = (CombineRange *) palloc0(ncranges * sizeof(CombineRange));
- *nranges = ncranges;
/* put the new value at the beginning */
- cranges[0].minval = newvalue;
- cranges[0].maxval = newvalue;
- cranges[0].collapsed = true;
+ if (addvalue)
+ {
+ cranges[0].minval = newvalue;
+ cranges[0].maxval = newvalue;
+ cranges[0].collapsed = true;
- /* then the regular and collapsed ranges */
- fill_combine_ranges(&cranges[1], ncranges-1, ranges);
+ /* then the regular and collapsed ranges */
+ fill_combine_ranges(&cranges[1], ncranges-1, ranges);
+ }
+ else
+ fill_combine_ranges(cranges, ncranges, ranges);
/* and sort the ranges */
- sort_combine_ranges(cmp, colloid, cranges, ncranges);
+ ncranges = sort_combine_ranges(cmp, colloid, cranges, ncranges,
+ deduplicate);
+
+ /* remember how many cranges we built */
+ *nranges = ncranges;
return cranges;
}
@@ -1074,6 +1122,7 @@ count_values(CombineRange *cranges, int ncranges)
}
#endif
+
/*
* reduce_combine_ranges
* reduce the ranges until the number of values is low enough
@@ -1250,6 +1299,25 @@ range_add_value(BrinDesc *bdesc, Oid colloid,
Assert(2*ranges->nranges + ranges->nvalues <= ranges->maxvalues);
+ Assert((ranges->nranges >= 0) && (ranges->nvalues >= 0) && (ranges->maxvalues >= 0));
+
+ /*
+ * When batch-building, there should be no ranges. So either the
+ * number of ranges is 0 or we're not in batching mode.
+ */
+ Assert(!ranges->batch_mode || (ranges->nranges == 0));
+
+ /* When batch-building, just add it and we're done. */
+ if (ranges->batch_mode)
+ {
+ /* there has to be free space, if we've sized the struct */
+ Assert(ranges->nvalues < ranges->maxvalues);
+
+ ranges->values[ranges->nvalues++] = newval;
+
+ return true;
+ }
+
/*
* Bail out if the value already is covered by the range.
*
@@ -1322,7 +1390,9 @@ range_add_value(BrinDesc *bdesc, Oid colloid,
ranges->nvalues);
/* OK build the combine ranges */
- cranges = build_combine_ranges(cmpFn, colloid, ranges, newval, &ncranges);
+ cranges = build_combine_ranges(cmpFn, colloid, ranges,
+ true, newval, &ncranges,
+ false);
/* Reduce the ranges if needed */
if (ncranges > ranges->maxvalues)
@@ -1382,6 +1452,81 @@ range_add_value(BrinDesc *bdesc, Oid colloid,
return true;
}
+/*
+ * Generate range representation of data collected during "batch mode".
+ * This is similar to reduce_combine_ranges, except that we can't assume
+ * the values are sorted and there may be duplicate values.
+ */
+static void
+compactify_ranges(BrinDesc *bdesc, Ranges *ranges, int max_values)
+{
+ FmgrInfo *cmpFn,
+ *distanceFn;
+
+ /* combine ranges */
+ CombineRange *cranges;
+ int ncranges;
+ DistanceValue *distances;
+
+ MemoryContext ctx;
+ MemoryContext oldctx;
+
+ /*
+ * This should only be used in batch mode, and there should be no
+ * ranges, just individual values.
+ */
+ Assert((ranges->batch_mode) && (ranges->nranges == 0));
+
+ /* we'll certainly need the comparator, so just look it up now */
+ cmpFn = minmax_multi_get_strategy_procinfo(bdesc, ranges->attno, ranges->typid,
+ BTLessStrategyNumber);
+
+ /* and we'll also need the 'distance' procedure */
+ distanceFn = minmax_multi_get_procinfo(bdesc, ranges->attno, PROCNUM_DISTANCE);
+
+ /*
+ * The distanceFn calls (which may internally call e.g. numeric_le) may
+ * allocate quite a bit of memory, and we must not leak it. Otherwise
+ * we'd have problems e.g. when building indexes. So we create a local
+ * memory context and make sure we free the memory before leaving this
+ * function (not after every call).
+ */
+ ctx = AllocSetContextCreate(CurrentMemoryContext,
+ "minmax-multi context",
+ ALLOCSET_DEFAULT_SIZES);
+
+ oldctx = MemoryContextSwitchTo(ctx);
+
+ /* OK build the combine ranges */
+ cranges = build_combine_ranges(cmpFn, ranges->colloid, ranges,
+ false, (Datum) 0, &ncranges,
+ true); /* deduplicate */
+
+ /* build array of gap distances and sort them in ascending order */
+ distances = build_distances(distanceFn, ranges->colloid, cranges, ncranges);
+
+ /*
+ * Combine ranges until we get below max_values. We don't use any scale
+ * factor, because this is used at the very end of "batch mode" and we
+ * don't expect more tuples to be inserted soon.
+ */
+ ncranges = reduce_combine_ranges(cranges, ncranges, distances,
+ max_values, cmpFn, ranges->colloid);
+
+ Assert(count_values(cranges, ncranges) <= max_values);
+
+ /* decompose the combine ranges into regular ranges and single values */
+ store_combine_ranges(ranges, cranges, ncranges);
+
+ MemoryContextSwitchTo(oldctx);
+ MemoryContextDelete(ctx);
+
+ /* Check the ordering invariants are not violated (for both parts). */
+ AssertArrayOrder(cmpFn, ranges->colloid, ranges->values, ranges->nranges*2);
+ AssertArrayOrder(cmpFn, ranges->colloid, &ranges->values[ranges->nranges*2],
+ ranges->nvalues);
+}
+
Datum
brin_minmax_multi_opcinfo(PG_FUNCTION_ARGS)
{
@@ -1799,10 +1944,16 @@ brin_minmax_multi_distance_inet(PG_FUNCTION_ARGS)
}
static void
-brin_minmax_multi_serialize(Datum src, Datum *dst)
+brin_minmax_multi_serialize(BrinDesc *bdesc, Datum src, Datum *dst)
{
Ranges *ranges = (Ranges *) DatumGetPointer(src);
- SerializedRanges *s = range_serialize(ranges);
+ SerializedRanges *s;
+
+ /* In batch mode, we need to compress the accumulated values. */
+ if (ranges->batch_mode)
+ compactify_ranges(bdesc, ranges, ranges->target_maxvalues);
+
+ s = range_serialize(ranges);
dst[0] = PointerGetDatum(s);
}
@@ -1845,15 +1996,28 @@ brin_minmax_multi_add_value(PG_FUNCTION_ARGS)
/*
* If this is the first non-null value, we need to initialize the range
* list. Otherwise just extract the existing range list from BrinValues.
+ *
+ * When starting with an empty range, we assume this is a batch mode,
+ * i.e. we size the buffer for the maximum possible number of items in
+ * the range (based on range size and max number of items on a page).
+ *
+ * XXX This may require quite a bit of memory, so maybe we should use
+ * some value in between. OTOH most tables will have much wider rows,
+ * so the number of rows per page is much lower.
*/
if (column->bv_allnulls)
{
MemoryContext oldctx;
- oldctx = MemoryContextSwitchTo(column->bv_context);
+ BlockNumber pagesPerRange = BrinGetPagesPerRange(bdesc->bd_index);
- ranges = minmax_multi_init(brin_minmax_multi_get_values(bdesc, opts));
+ oldctx = MemoryContextSwitchTo(column->bv_context);
+ ranges = minmax_multi_init(MaxHeapTuplesPerPage * pagesPerRange);
+ ranges->attno = attno;
+ ranges->colloid = colloid;
ranges->typid = attr->atttypid;
+ ranges->batch_mode = true;
+ ranges->target_maxvalues = brin_minmax_multi_get_values(bdesc, opts);
MemoryContextSwitchTo(oldctx);
@@ -2125,7 +2289,7 @@ brin_minmax_multi_union(PG_FUNCTION_ARGS)
oldctx = MemoryContextSwitchTo(ctx);
/* allocate and fill */
- cranges = (CombineRange *)palloc0(ncranges * sizeof(CombineRange));
+ cranges = (CombineRange *) palloc0(ncranges * sizeof(CombineRange));
/* fill the combine ranges with entries for the first range */
fill_combine_ranges(cranges, ranges_a->nranges + ranges_a->nvalues,
@@ -2139,8 +2303,8 @@ brin_minmax_multi_union(PG_FUNCTION_ARGS)
cmpFn = minmax_multi_get_strategy_procinfo(bdesc, attno, attr->atttypid,
BTLessStrategyNumber);
- /* sort the combine ranges */
- sort_combine_ranges(cmpFn, colloid, cranges, ncranges);
+ /* sort the combine ranges (don't deduplicate) */
+ sort_combine_ranges(cmpFn, colloid, cranges, ncranges, false);
/*
* We've merged two different lists of ranges, so some of them may be
diff --git a/src/backend/access/brin/brin_tuple.c b/src/backend/access/brin/brin_tuple.c
index df820db029..bf8635d788 100644
--- a/src/backend/access/brin/brin_tuple.c
+++ b/src/backend/access/brin/brin_tuple.c
@@ -163,6 +163,7 @@ brin_form_tuple(BrinDesc *brdesc, BlockNumber blkno, BrinMemTuple *tuple,
if (tuple->bt_columns[keyno].bv_serialize)
{
tuple->bt_columns[keyno].bv_serialize(
+ brdesc,
tuple->bt_columns[keyno].bv_mem_value,
tuple->bt_columns[keyno].bv_values);
}
diff --git a/src/include/access/brin_tuple.h b/src/include/access/brin_tuple.h
index 66a6c3c792..e08998b71a 100644
--- a/src/include/access/brin_tuple.h
+++ b/src/include/access/brin_tuple.h
@@ -14,7 +14,7 @@
#include "access/brin_internal.h"
#include "access/tupdesc.h"
-typedef void (*brin_serialize_callback_type) (Datum src, Datum * dst);
+typedef void (*brin_serialize_callback_type) (BrinDesc *bdesc, Datum src, Datum * dst);
/*
* A BRIN index stores one index tuple per page range. Each index tuple
--
2.26.2
--------------FA974B75A0C3E9CA18CE7207
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--------------FA974B75A0C3E9CA18CE7207--
^ permalink raw reply [nested|flat] 29+ messages in thread
* [PATCH 8/8] batch build
@ 2021-01-22 00:11 Tomas Vondra <[email protected]>
0 siblings, 0 replies; 29+ messages in thread
From: Tomas Vondra @ 2021-01-22 00:11 UTC (permalink / raw)
---
src/backend/access/brin/brin_minmax_multi.c | 204 ++++++++++++++++++--
src/backend/access/brin/brin_tuple.c | 1 +
src/include/access/brin_tuple.h | 2 +-
3 files changed, 186 insertions(+), 21 deletions(-)
diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 094ecd2be9..72cca6f26b 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -57,6 +57,7 @@
#include "access/brin.h"
#include "access/brin_internal.h"
#include "access/brin_tuple.h"
+#include "access/hash.h" /* XXX strange that it fails because of BRIN_AM_OID without this */
#include "access/reloptions.h"
#include "access/stratnum.h"
#include "access/htup_details.h"
@@ -150,12 +151,23 @@ typedef struct MinMaxOptions
typedef struct Ranges
{
Oid typid;
+ Oid colloid;
+ AttrNumber attno;
/* (2*nranges + nvalues) <= maxvalues */
int nranges; /* number of ranges in the array (stored) */
int nvalues; /* number of values in the data array (all) */
int maxvalues; /* maximum number of values (reloption) */
+ /*
+ * Batch mode means we're simply appending values into new range,
+ * without any expensive steps (sorting, deduplication, ...). The
+ * buffer is sized to be much larger, but we keep the actual target
+ * size so that when serializing values we can do the right thing.
+ */
+ bool batch_mode;
+ int target_maxvalues;
+
/* values stored for this range - either raw values, or ranges */
Datum values[FLEXIBLE_ARRAY_MEMBER];
} Ranges;
@@ -375,6 +387,7 @@ range_deserialize(SerializedRanges *serialized)
range->nvalues = serialized->nvalues;
range->maxvalues = serialized->maxvalues;
range->typid = serialized->typid;
+ range->batch_mode = false;
typbyval = get_typbyval(serialized->typid);
typlen = get_typlen(serialized->typid);
@@ -844,11 +857,14 @@ fill_combine_ranges(CombineRange *cranges, int ncranges, Ranges *ranges)
/*
* Sort combine ranges using qsort (with BTLessStrategyNumber function).
*/
-static void
+static int
sort_combine_ranges(FmgrInfo *cmp, Oid colloid,
- CombineRange *cranges, int ncranges)
+ CombineRange *cranges, int ncranges,
+ bool deduplicate)
{
- compare_context cxt;
+ int n;
+ int i;
+ compare_context cxt;
/* sort the values */
cxt.colloid = colloid;
@@ -856,6 +872,24 @@ sort_combine_ranges(FmgrInfo *cmp, Oid colloid,
qsort_arg(cranges, ncranges, sizeof(CombineRange),
compare_combine_ranges, (void *) &cxt);
+
+ if (!deduplicate)
+ return ncranges;
+
+ /* optionally deduplicate the ranges */
+ n = 1;
+ for (i = 1; i < ncranges; i++)
+ {
+ if (compare_combine_ranges(&cranges[i-1], &cranges[i], (void *) &cxt))
+ {
+ if (i != n)
+ memcpy(&cranges[n], &cranges[i], sizeof(CombineRange));
+
+ n++;
+ }
+ }
+
+ return n;
}
/*
@@ -1026,26 +1060,40 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
*/
static CombineRange *
build_combine_ranges(FmgrInfo *cmp, Oid colloid, Ranges *ranges,
- Datum newvalue, int *nranges)
+ bool addvalue, Datum newvalue, int *nranges,
+ bool deduplicate)
{
int ncranges;
CombineRange *cranges;
/* now do the actual merge sort */
- ncranges = ranges->nranges + ranges->nvalues + 1;
+ ncranges = ranges->nranges + ranges->nvalues;
+
+ /* should we add an extra value? */
+ if (addvalue)
+ ncranges += 1;
+
cranges = (CombineRange *) palloc0(ncranges * sizeof(CombineRange));
- *nranges = ncranges;
/* put the new value at the beginning */
- cranges[0].minval = newvalue;
- cranges[0].maxval = newvalue;
- cranges[0].collapsed = true;
+ if (addvalue)
+ {
+ cranges[0].minval = newvalue;
+ cranges[0].maxval = newvalue;
+ cranges[0].collapsed = true;
- /* then the regular and collapsed ranges */
- fill_combine_ranges(&cranges[1], ncranges-1, ranges);
+ /* then the regular and collapsed ranges */
+ fill_combine_ranges(&cranges[1], ncranges-1, ranges);
+ }
+ else
+ fill_combine_ranges(cranges, ncranges, ranges);
/* and sort the ranges */
- sort_combine_ranges(cmp, colloid, cranges, ncranges);
+ ncranges = sort_combine_ranges(cmp, colloid, cranges, ncranges,
+ deduplicate);
+
+ /* remember how many cranges we built */
+ *nranges = ncranges;
return cranges;
}
@@ -1074,6 +1122,7 @@ count_values(CombineRange *cranges, int ncranges)
}
#endif
+
/*
* reduce_combine_ranges
* reduce the ranges until the number of values is low enough
@@ -1250,6 +1299,25 @@ range_add_value(BrinDesc *bdesc, Oid colloid,
Assert(2*ranges->nranges + ranges->nvalues <= ranges->maxvalues);
+ Assert((ranges->nranges >= 0) && (ranges->nvalues >= 0) && (ranges->maxvalues >= 0));
+
+ /*
+ * When batch-building, there should be no ranges. So either the
+ * number of ranges is 0 or we're not in batching mode.
+ */
+ Assert(!ranges->batch_mode || (ranges->nranges == 0));
+
+ /* When batch-building, just add it and we're done. */
+ if (ranges->batch_mode)
+ {
+ /* there has to be free space, if we've sized the struct */
+ Assert(ranges->nvalues < ranges->maxvalues);
+
+ ranges->values[ranges->nvalues++] = newval;
+
+ return true;
+ }
+
/*
* Bail out if the value already is covered by the range.
*
@@ -1322,7 +1390,9 @@ range_add_value(BrinDesc *bdesc, Oid colloid,
ranges->nvalues);
/* OK build the combine ranges */
- cranges = build_combine_ranges(cmpFn, colloid, ranges, newval, &ncranges);
+ cranges = build_combine_ranges(cmpFn, colloid, ranges,
+ true, newval, &ncranges,
+ false);
/* Reduce the ranges if needed */
if (ncranges > ranges->maxvalues)
@@ -1382,6 +1452,81 @@ range_add_value(BrinDesc *bdesc, Oid colloid,
return true;
}
+/*
+ * Generate range representation of data collected during "batch mode".
+ * This is similar to reduce_combine_ranges, except that we can't assume
+ * the values are sorted and there may be duplicate values.
+ */
+static void
+compactify_ranges(BrinDesc *bdesc, Ranges *ranges, int max_values)
+{
+ FmgrInfo *cmpFn,
+ *distanceFn;
+
+ /* combine ranges */
+ CombineRange *cranges;
+ int ncranges;
+ DistanceValue *distances;
+
+ MemoryContext ctx;
+ MemoryContext oldctx;
+
+ /*
+ * This should only be used in batch mode, and there should be no
+ * ranges, just individual values.
+ */
+ Assert((ranges->batch_mode) && (ranges->nranges == 0));
+
+ /* we'll certainly need the comparator, so just look it up now */
+ cmpFn = minmax_multi_get_strategy_procinfo(bdesc, ranges->attno, ranges->typid,
+ BTLessStrategyNumber);
+
+ /* and we'll also need the 'distance' procedure */
+ distanceFn = minmax_multi_get_procinfo(bdesc, ranges->attno, PROCNUM_DISTANCE);
+
+ /*
+ * The distanceFn calls (which may internally call e.g. numeric_le) may
+ * allocate quite a bit of memory, and we must not leak it. Otherwise
+ * we'd have problems e.g. when building indexes. So we create a local
+ * memory context and make sure we free the memory before leaving this
+ * function (not after every call).
+ */
+ ctx = AllocSetContextCreate(CurrentMemoryContext,
+ "minmax-multi context",
+ ALLOCSET_DEFAULT_SIZES);
+
+ oldctx = MemoryContextSwitchTo(ctx);
+
+ /* OK build the combine ranges */
+ cranges = build_combine_ranges(cmpFn, ranges->colloid, ranges,
+ false, (Datum) 0, &ncranges,
+ true); /* deduplicate */
+
+ /* build array of gap distances and sort them in ascending order */
+ distances = build_distances(distanceFn, ranges->colloid, cranges, ncranges);
+
+ /*
+ * Combine ranges until we get below max_values. We don't use any scale
+ * factor, because this is used at the very end of "batch mode" and we
+ * don't expect more tuples to be inserted soon.
+ */
+ ncranges = reduce_combine_ranges(cranges, ncranges, distances,
+ max_values, cmpFn, ranges->colloid);
+
+ Assert(count_values(cranges, ncranges) <= max_values);
+
+ /* decompose the combine ranges into regular ranges and single values */
+ store_combine_ranges(ranges, cranges, ncranges);
+
+ MemoryContextSwitchTo(oldctx);
+ MemoryContextDelete(ctx);
+
+ /* Check the ordering invariants are not violated (for both parts). */
+ AssertArrayOrder(cmpFn, ranges->colloid, ranges->values, ranges->nranges*2);
+ AssertArrayOrder(cmpFn, ranges->colloid, &ranges->values[ranges->nranges*2],
+ ranges->nvalues);
+}
+
Datum
brin_minmax_multi_opcinfo(PG_FUNCTION_ARGS)
{
@@ -1799,10 +1944,16 @@ brin_minmax_multi_distance_inet(PG_FUNCTION_ARGS)
}
static void
-brin_minmax_multi_serialize(Datum src, Datum *dst)
+brin_minmax_multi_serialize(BrinDesc *bdesc, Datum src, Datum *dst)
{
Ranges *ranges = (Ranges *) DatumGetPointer(src);
- SerializedRanges *s = range_serialize(ranges);
+ SerializedRanges *s;
+
+ /* In batch mode, we need to compress the accumulated values. */
+ if (ranges->batch_mode)
+ compactify_ranges(bdesc, ranges, ranges->target_maxvalues);
+
+ s = range_serialize(ranges);
dst[0] = PointerGetDatum(s);
}
@@ -1845,15 +1996,28 @@ brin_minmax_multi_add_value(PG_FUNCTION_ARGS)
/*
* If this is the first non-null value, we need to initialize the range
* list. Otherwise just extract the existing range list from BrinValues.
+ *
+ * When starting with an empty range, we assume this is a batch mode,
+ * i.e. we size the buffer for the maximum possible number of items in
+ * the range (based on range size and max number of items on a page).
+ *
+ * XXX This may require quite a bit of memory, so maybe we should use
+ * some value in between. OTOH most tables will have much wider rows,
+ * so the number of rows per page is much lower.
*/
if (column->bv_allnulls)
{
MemoryContext oldctx;
- oldctx = MemoryContextSwitchTo(column->bv_context);
+ BlockNumber pagesPerRange = BrinGetPagesPerRange(bdesc->bd_index);
- ranges = minmax_multi_init(brin_minmax_multi_get_values(bdesc, opts));
+ oldctx = MemoryContextSwitchTo(column->bv_context);
+ ranges = minmax_multi_init(MaxHeapTuplesPerPage * pagesPerRange);
+ ranges->attno = attno;
+ ranges->colloid = colloid;
ranges->typid = attr->atttypid;
+ ranges->batch_mode = true;
+ ranges->target_maxvalues = brin_minmax_multi_get_values(bdesc, opts);
MemoryContextSwitchTo(oldctx);
@@ -2125,7 +2289,7 @@ brin_minmax_multi_union(PG_FUNCTION_ARGS)
oldctx = MemoryContextSwitchTo(ctx);
/* allocate and fill */
- cranges = (CombineRange *)palloc0(ncranges * sizeof(CombineRange));
+ cranges = (CombineRange *) palloc0(ncranges * sizeof(CombineRange));
/* fill the combine ranges with entries for the first range */
fill_combine_ranges(cranges, ranges_a->nranges + ranges_a->nvalues,
@@ -2139,8 +2303,8 @@ brin_minmax_multi_union(PG_FUNCTION_ARGS)
cmpFn = minmax_multi_get_strategy_procinfo(bdesc, attno, attr->atttypid,
BTLessStrategyNumber);
- /* sort the combine ranges */
- sort_combine_ranges(cmpFn, colloid, cranges, ncranges);
+ /* sort the combine ranges (don't deduplicate) */
+ sort_combine_ranges(cmpFn, colloid, cranges, ncranges, false);
/*
* We've merged two different lists of ranges, so some of them may be
diff --git a/src/backend/access/brin/brin_tuple.c b/src/backend/access/brin/brin_tuple.c
index df820db029..bf8635d788 100644
--- a/src/backend/access/brin/brin_tuple.c
+++ b/src/backend/access/brin/brin_tuple.c
@@ -163,6 +163,7 @@ brin_form_tuple(BrinDesc *brdesc, BlockNumber blkno, BrinMemTuple *tuple,
if (tuple->bt_columns[keyno].bv_serialize)
{
tuple->bt_columns[keyno].bv_serialize(
+ brdesc,
tuple->bt_columns[keyno].bv_mem_value,
tuple->bt_columns[keyno].bv_values);
}
diff --git a/src/include/access/brin_tuple.h b/src/include/access/brin_tuple.h
index 66a6c3c792..e08998b71a 100644
--- a/src/include/access/brin_tuple.h
+++ b/src/include/access/brin_tuple.h
@@ -14,7 +14,7 @@
#include "access/brin_internal.h"
#include "access/tupdesc.h"
-typedef void (*brin_serialize_callback_type) (Datum src, Datum * dst);
+typedef void (*brin_serialize_callback_type) (BrinDesc *bdesc, Datum src, Datum * dst);
/*
* A BRIN index stores one index tuple per page range. Each index tuple
--
2.26.2
--------------FA974B75A0C3E9CA18CE7207
Content-Type: application/x-shellscript;
name="brin.sh"
Content-Transfer-Encoding: base64
Content-Disposition: attachment;
filename="brin.sh"
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--------------FA974B75A0C3E9CA18CE7207--
^ permalink raw reply [nested|flat] 29+ messages in thread
* [PATCH 8/8] batch build
@ 2021-01-22 00:11 Tomas Vondra <[email protected]>
0 siblings, 0 replies; 29+ messages in thread
From: Tomas Vondra @ 2021-01-22 00:11 UTC (permalink / raw)
---
src/backend/access/brin/brin_minmax_multi.c | 204 ++++++++++++++++++--
src/backend/access/brin/brin_tuple.c | 1 +
src/include/access/brin_tuple.h | 2 +-
3 files changed, 186 insertions(+), 21 deletions(-)
diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index 094ecd2be9..72cca6f26b 100644
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -57,6 +57,7 @@
#include "access/brin.h"
#include "access/brin_internal.h"
#include "access/brin_tuple.h"
+#include "access/hash.h" /* XXX strange that it fails because of BRIN_AM_OID without this */
#include "access/reloptions.h"
#include "access/stratnum.h"
#include "access/htup_details.h"
@@ -150,12 +151,23 @@ typedef struct MinMaxOptions
typedef struct Ranges
{
Oid typid;
+ Oid colloid;
+ AttrNumber attno;
/* (2*nranges + nvalues) <= maxvalues */
int nranges; /* number of ranges in the array (stored) */
int nvalues; /* number of values in the data array (all) */
int maxvalues; /* maximum number of values (reloption) */
+ /*
+ * Batch mode means we're simply appending values into new range,
+ * without any expensive steps (sorting, deduplication, ...). The
+ * buffer is sized to be much larger, but we keep the actual target
+ * size so that when serializing values we can do the right thing.
+ */
+ bool batch_mode;
+ int target_maxvalues;
+
/* values stored for this range - either raw values, or ranges */
Datum values[FLEXIBLE_ARRAY_MEMBER];
} Ranges;
@@ -375,6 +387,7 @@ range_deserialize(SerializedRanges *serialized)
range->nvalues = serialized->nvalues;
range->maxvalues = serialized->maxvalues;
range->typid = serialized->typid;
+ range->batch_mode = false;
typbyval = get_typbyval(serialized->typid);
typlen = get_typlen(serialized->typid);
@@ -844,11 +857,14 @@ fill_combine_ranges(CombineRange *cranges, int ncranges, Ranges *ranges)
/*
* Sort combine ranges using qsort (with BTLessStrategyNumber function).
*/
-static void
+static int
sort_combine_ranges(FmgrInfo *cmp, Oid colloid,
- CombineRange *cranges, int ncranges)
+ CombineRange *cranges, int ncranges,
+ bool deduplicate)
{
- compare_context cxt;
+ int n;
+ int i;
+ compare_context cxt;
/* sort the values */
cxt.colloid = colloid;
@@ -856,6 +872,24 @@ sort_combine_ranges(FmgrInfo *cmp, Oid colloid,
qsort_arg(cranges, ncranges, sizeof(CombineRange),
compare_combine_ranges, (void *) &cxt);
+
+ if (!deduplicate)
+ return ncranges;
+
+ /* optionally deduplicate the ranges */
+ n = 1;
+ for (i = 1; i < ncranges; i++)
+ {
+ if (compare_combine_ranges(&cranges[i-1], &cranges[i], (void *) &cxt))
+ {
+ if (i != n)
+ memcpy(&cranges[n], &cranges[i], sizeof(CombineRange));
+
+ n++;
+ }
+ }
+
+ return n;
}
/*
@@ -1026,26 +1060,40 @@ build_distances(FmgrInfo *distanceFn, Oid colloid,
*/
static CombineRange *
build_combine_ranges(FmgrInfo *cmp, Oid colloid, Ranges *ranges,
- Datum newvalue, int *nranges)
+ bool addvalue, Datum newvalue, int *nranges,
+ bool deduplicate)
{
int ncranges;
CombineRange *cranges;
/* now do the actual merge sort */
- ncranges = ranges->nranges + ranges->nvalues + 1;
+ ncranges = ranges->nranges + ranges->nvalues;
+
+ /* should we add an extra value? */
+ if (addvalue)
+ ncranges += 1;
+
cranges = (CombineRange *) palloc0(ncranges * sizeof(CombineRange));
- *nranges = ncranges;
/* put the new value at the beginning */
- cranges[0].minval = newvalue;
- cranges[0].maxval = newvalue;
- cranges[0].collapsed = true;
+ if (addvalue)
+ {
+ cranges[0].minval = newvalue;
+ cranges[0].maxval = newvalue;
+ cranges[0].collapsed = true;
- /* then the regular and collapsed ranges */
- fill_combine_ranges(&cranges[1], ncranges-1, ranges);
+ /* then the regular and collapsed ranges */
+ fill_combine_ranges(&cranges[1], ncranges-1, ranges);
+ }
+ else
+ fill_combine_ranges(cranges, ncranges, ranges);
/* and sort the ranges */
- sort_combine_ranges(cmp, colloid, cranges, ncranges);
+ ncranges = sort_combine_ranges(cmp, colloid, cranges, ncranges,
+ deduplicate);
+
+ /* remember how many cranges we built */
+ *nranges = ncranges;
return cranges;
}
@@ -1074,6 +1122,7 @@ count_values(CombineRange *cranges, int ncranges)
}
#endif
+
/*
* reduce_combine_ranges
* reduce the ranges until the number of values is low enough
@@ -1250,6 +1299,25 @@ range_add_value(BrinDesc *bdesc, Oid colloid,
Assert(2*ranges->nranges + ranges->nvalues <= ranges->maxvalues);
+ Assert((ranges->nranges >= 0) && (ranges->nvalues >= 0) && (ranges->maxvalues >= 0));
+
+ /*
+ * When batch-building, there should be no ranges. So either the
+ * number of ranges is 0 or we're not in batching mode.
+ */
+ Assert(!ranges->batch_mode || (ranges->nranges == 0));
+
+ /* When batch-building, just add it and we're done. */
+ if (ranges->batch_mode)
+ {
+ /* there has to be free space, if we've sized the struct */
+ Assert(ranges->nvalues < ranges->maxvalues);
+
+ ranges->values[ranges->nvalues++] = newval;
+
+ return true;
+ }
+
/*
* Bail out if the value already is covered by the range.
*
@@ -1322,7 +1390,9 @@ range_add_value(BrinDesc *bdesc, Oid colloid,
ranges->nvalues);
/* OK build the combine ranges */
- cranges = build_combine_ranges(cmpFn, colloid, ranges, newval, &ncranges);
+ cranges = build_combine_ranges(cmpFn, colloid, ranges,
+ true, newval, &ncranges,
+ false);
/* Reduce the ranges if needed */
if (ncranges > ranges->maxvalues)
@@ -1382,6 +1452,81 @@ range_add_value(BrinDesc *bdesc, Oid colloid,
return true;
}
+/*
+ * Generate range representation of data collected during "batch mode".
+ * This is similar to reduce_combine_ranges, except that we can't assume
+ * the values are sorted and there may be duplicate values.
+ */
+static void
+compactify_ranges(BrinDesc *bdesc, Ranges *ranges, int max_values)
+{
+ FmgrInfo *cmpFn,
+ *distanceFn;
+
+ /* combine ranges */
+ CombineRange *cranges;
+ int ncranges;
+ DistanceValue *distances;
+
+ MemoryContext ctx;
+ MemoryContext oldctx;
+
+ /*
+ * This should only be used in batch mode, and there should be no
+ * ranges, just individual values.
+ */
+ Assert((ranges->batch_mode) && (ranges->nranges == 0));
+
+ /* we'll certainly need the comparator, so just look it up now */
+ cmpFn = minmax_multi_get_strategy_procinfo(bdesc, ranges->attno, ranges->typid,
+ BTLessStrategyNumber);
+
+ /* and we'll also need the 'distance' procedure */
+ distanceFn = minmax_multi_get_procinfo(bdesc, ranges->attno, PROCNUM_DISTANCE);
+
+ /*
+ * The distanceFn calls (which may internally call e.g. numeric_le) may
+ * allocate quite a bit of memory, and we must not leak it. Otherwise
+ * we'd have problems e.g. when building indexes. So we create a local
+ * memory context and make sure we free the memory before leaving this
+ * function (not after every call).
+ */
+ ctx = AllocSetContextCreate(CurrentMemoryContext,
+ "minmax-multi context",
+ ALLOCSET_DEFAULT_SIZES);
+
+ oldctx = MemoryContextSwitchTo(ctx);
+
+ /* OK build the combine ranges */
+ cranges = build_combine_ranges(cmpFn, ranges->colloid, ranges,
+ false, (Datum) 0, &ncranges,
+ true); /* deduplicate */
+
+ /* build array of gap distances and sort them in ascending order */
+ distances = build_distances(distanceFn, ranges->colloid, cranges, ncranges);
+
+ /*
+ * Combine ranges until we get below max_values. We don't use any scale
+ * factor, because this is used at the very end of "batch mode" and we
+ * don't expect more tuples to be inserted soon.
+ */
+ ncranges = reduce_combine_ranges(cranges, ncranges, distances,
+ max_values, cmpFn, ranges->colloid);
+
+ Assert(count_values(cranges, ncranges) <= max_values);
+
+ /* decompose the combine ranges into regular ranges and single values */
+ store_combine_ranges(ranges, cranges, ncranges);
+
+ MemoryContextSwitchTo(oldctx);
+ MemoryContextDelete(ctx);
+
+ /* Check the ordering invariants are not violated (for both parts). */
+ AssertArrayOrder(cmpFn, ranges->colloid, ranges->values, ranges->nranges*2);
+ AssertArrayOrder(cmpFn, ranges->colloid, &ranges->values[ranges->nranges*2],
+ ranges->nvalues);
+}
+
Datum
brin_minmax_multi_opcinfo(PG_FUNCTION_ARGS)
{
@@ -1799,10 +1944,16 @@ brin_minmax_multi_distance_inet(PG_FUNCTION_ARGS)
}
static void
-brin_minmax_multi_serialize(Datum src, Datum *dst)
+brin_minmax_multi_serialize(BrinDesc *bdesc, Datum src, Datum *dst)
{
Ranges *ranges = (Ranges *) DatumGetPointer(src);
- SerializedRanges *s = range_serialize(ranges);
+ SerializedRanges *s;
+
+ /* In batch mode, we need to compress the accumulated values. */
+ if (ranges->batch_mode)
+ compactify_ranges(bdesc, ranges, ranges->target_maxvalues);
+
+ s = range_serialize(ranges);
dst[0] = PointerGetDatum(s);
}
@@ -1845,15 +1996,28 @@ brin_minmax_multi_add_value(PG_FUNCTION_ARGS)
/*
* If this is the first non-null value, we need to initialize the range
* list. Otherwise just extract the existing range list from BrinValues.
+ *
+ * When starting with an empty range, we assume this is a batch mode,
+ * i.e. we size the buffer for the maximum possible number of items in
+ * the range (based on range size and max number of items on a page).
+ *
+ * XXX This may require quite a bit of memory, so maybe we should use
+ * some value in between. OTOH most tables will have much wider rows,
+ * so the number of rows per page is much lower.
*/
if (column->bv_allnulls)
{
MemoryContext oldctx;
- oldctx = MemoryContextSwitchTo(column->bv_context);
+ BlockNumber pagesPerRange = BrinGetPagesPerRange(bdesc->bd_index);
- ranges = minmax_multi_init(brin_minmax_multi_get_values(bdesc, opts));
+ oldctx = MemoryContextSwitchTo(column->bv_context);
+ ranges = minmax_multi_init(MaxHeapTuplesPerPage * pagesPerRange);
+ ranges->attno = attno;
+ ranges->colloid = colloid;
ranges->typid = attr->atttypid;
+ ranges->batch_mode = true;
+ ranges->target_maxvalues = brin_minmax_multi_get_values(bdesc, opts);
MemoryContextSwitchTo(oldctx);
@@ -2125,7 +2289,7 @@ brin_minmax_multi_union(PG_FUNCTION_ARGS)
oldctx = MemoryContextSwitchTo(ctx);
/* allocate and fill */
- cranges = (CombineRange *)palloc0(ncranges * sizeof(CombineRange));
+ cranges = (CombineRange *) palloc0(ncranges * sizeof(CombineRange));
/* fill the combine ranges with entries for the first range */
fill_combine_ranges(cranges, ranges_a->nranges + ranges_a->nvalues,
@@ -2139,8 +2303,8 @@ brin_minmax_multi_union(PG_FUNCTION_ARGS)
cmpFn = minmax_multi_get_strategy_procinfo(bdesc, attno, attr->atttypid,
BTLessStrategyNumber);
- /* sort the combine ranges */
- sort_combine_ranges(cmpFn, colloid, cranges, ncranges);
+ /* sort the combine ranges (don't deduplicate) */
+ sort_combine_ranges(cmpFn, colloid, cranges, ncranges, false);
/*
* We've merged two different lists of ranges, so some of them may be
diff --git a/src/backend/access/brin/brin_tuple.c b/src/backend/access/brin/brin_tuple.c
index df820db029..bf8635d788 100644
--- a/src/backend/access/brin/brin_tuple.c
+++ b/src/backend/access/brin/brin_tuple.c
@@ -163,6 +163,7 @@ brin_form_tuple(BrinDesc *brdesc, BlockNumber blkno, BrinMemTuple *tuple,
if (tuple->bt_columns[keyno].bv_serialize)
{
tuple->bt_columns[keyno].bv_serialize(
+ brdesc,
tuple->bt_columns[keyno].bv_mem_value,
tuple->bt_columns[keyno].bv_values);
}
diff --git a/src/include/access/brin_tuple.h b/src/include/access/brin_tuple.h
index 66a6c3c792..e08998b71a 100644
--- a/src/include/access/brin_tuple.h
+++ b/src/include/access/brin_tuple.h
@@ -14,7 +14,7 @@
#include "access/brin_internal.h"
#include "access/tupdesc.h"
-typedef void (*brin_serialize_callback_type) (Datum src, Datum * dst);
+typedef void (*brin_serialize_callback_type) (BrinDesc *bdesc, Datum src, Datum * dst);
/*
* A BRIN index stores one index tuple per page range. Each index tuple
--
2.26.2
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--------------FA974B75A0C3E9CA18CE7207--
^ permalink raw reply [nested|flat] 29+ messages in thread
* Re: Add --{no-,}bypassrls flags to createuser
@ 2022-04-15 06:33 Kyotaro Horiguchi <[email protected]>
2022-04-18 13:59 ` Re: Add --{no-,}bypassrls flags to createuser Robert Haas <[email protected]>
0 siblings, 1 reply; 29+ messages in thread
From: Kyotaro Horiguchi @ 2022-04-15 06:33 UTC (permalink / raw)
To: [email protected]; +Cc: [email protected]; [email protected]; [email protected]; pgsql-hackers
At Fri, 15 Apr 2022 14:55:48 +0900, Shinya Kato <[email protected]> wrote in
> I understand. For backward compatibility, I left the ROLE clause
> option as it is and changed the IN ROLE clause option to --membership
> option.
Thanks!
- printf(_(" -g, --role=ROLE new role will be a member of this role\n"));
+ printf(_(" -g, --role=ROLE new role will be a member of this role\n"));
This looks lik an unexpected change. We shoudl preserve it, but *I*
think that we can add a synonym of the old --role for
understandability/memorability. (By the way "-g" looks like coming
from "group", which looks somewhat strange..)
> printf(_(" -b, --belongs-to=ROLE new role will be a member of this role\n"));
+ printf(_(" -m, --membership=ROLE this role will be a member of new role\n"));
membership sounds somewhat obscure, it seems *to me* members is clearer
> printf(_(" -m, --member=ROLE new role will be a member of this role\n"));
I'd like to hear others' opinions.
regards.
--
Kyotaro Horiguchi
NTT Open Source Software Center
^ permalink raw reply [nested|flat] 29+ messages in thread
* Re: Add --{no-,}bypassrls flags to createuser
2022-04-15 06:33 Re: Add --{no-,}bypassrls flags to createuser Kyotaro Horiguchi <[email protected]>
@ 2022-04-18 13:59 ` Robert Haas <[email protected]>
2022-04-19 01:50 ` Re: Add --{no-,}bypassrls flags to createuser Kyotaro Horiguchi <[email protected]>
0 siblings, 1 reply; 29+ messages in thread
From: Robert Haas @ 2022-04-18 13:59 UTC (permalink / raw)
To: Kyotaro Horiguchi <[email protected]>; +Cc: Shinya Kato <[email protected]>; Daniel Gustafsson <[email protected]>; Michael Paquier <[email protected]>; pgsql-hackers
On Fri, Apr 15, 2022 at 2:33 AM Kyotaro Horiguchi
<[email protected]> wrote:
> > printf(_(" -b, --belongs-to=ROLE new role will be a member of this role\n"));
>
> + printf(_(" -m, --membership=ROLE this role will be a member of new role\n"));
>
> membership sounds somewhat obscure, it seems *to me* members is clearer
>
> > printf(_(" -m, --member=ROLE new role will be a member of this role\n"));
>
> I'd like to hear others' opinions.
I think that we need to preserve consistency with the SQL syntax as
much as possible -- and neither MEMBER nor MEMBERSHIP nor BELONGS_TO
appear in that syntax. A lot of the terminology in this area seems
poorly chosen and confusing to me, but having two ways to refer to
something probably won't be an improvement even if the second name is
better-chosen than the first one.
--
Robert Haas
EDB: http://www.enterprisedb.com
^ permalink raw reply [nested|flat] 29+ messages in thread
* Re: Add --{no-,}bypassrls flags to createuser
2022-04-15 06:33 Re: Add --{no-,}bypassrls flags to createuser Kyotaro Horiguchi <[email protected]>
2022-04-18 13:59 ` Re: Add --{no-,}bypassrls flags to createuser Robert Haas <[email protected]>
@ 2022-04-19 01:50 ` Kyotaro Horiguchi <[email protected]>
2022-04-19 16:13 ` Re: Add --{no-,}bypassrls flags to createuser Robert Haas <[email protected]>
0 siblings, 1 reply; 29+ messages in thread
From: Kyotaro Horiguchi @ 2022-04-19 01:50 UTC (permalink / raw)
To: [email protected]; +Cc: [email protected]; [email protected]; [email protected]; pgsql-hackers
Thanks!
At Mon, 18 Apr 2022 09:59:48 -0400, Robert Haas <[email protected]> wrote in
> On Fri, Apr 15, 2022 at 2:33 AM Kyotaro Horiguchi
> <[email protected]> wrote:
> > > printf(_(" -b, --belongs-to=ROLE new role will be a member of this role\n"));
> >
> > + printf(_(" -m, --membership=ROLE this role will be a member of new role\n"));
> >
> > membership sounds somewhat obscure, it seems *to me* members is clearer
> >
> > > printf(_(" -m, --member=ROLE new role will be a member of this role\n"));
> >
> > I'd like to hear others' opinions.
>
> I think that we need to preserve consistency with the SQL syntax as
> much as possible -- and neither MEMBER nor MEMBERSHIP nor BELONGS_TO
> appear in that syntax. A lot of the terminology in this area seems
> poorly chosen and confusing to me, but having two ways to refer to
> something probably won't be an improvement even if the second name is
> better-chosen than the first one.
Hmm.. So, "-r/--role" and "-m/--member(ship)" is the (least worse) way
to go? Or we can give up adding -m for the reason of being hard to
name it..
regards.
--
Kyotaro Horiguchi
NTT Open Source Software Center
^ permalink raw reply [nested|flat] 29+ messages in thread
* Re: Add --{no-,}bypassrls flags to createuser
2022-04-15 06:33 Re: Add --{no-,}bypassrls flags to createuser Kyotaro Horiguchi <[email protected]>
2022-04-18 13:59 ` Re: Add --{no-,}bypassrls flags to createuser Robert Haas <[email protected]>
2022-04-19 01:50 ` Re: Add --{no-,}bypassrls flags to createuser Kyotaro Horiguchi <[email protected]>
@ 2022-04-19 16:13 ` Robert Haas <[email protected]>
2022-04-20 08:04 ` Re: Add --{no-,}bypassrls flags to createuser Kyotaro Horiguchi <[email protected]>
2022-04-21 04:29 ` Re: Add --{no-,}bypassrls flags to createuser Michael Paquier <[email protected]>
0 siblings, 2 replies; 29+ messages in thread
From: Robert Haas @ 2022-04-19 16:13 UTC (permalink / raw)
To: Kyotaro Horiguchi <[email protected]>; +Cc: Shinya Kato <[email protected]>; Daniel Gustafsson <[email protected]>; Michael Paquier <[email protected]>; pgsql-hackers
On Mon, Apr 18, 2022 at 9:50 PM Kyotaro Horiguchi
<[email protected]> wrote:
> Hmm.. So, "-r/--role" and "-m/--member(ship)" is the (least worse) way
> to go? Or we can give up adding -m for the reason of being hard to
> name it..
Hmm, yeah, I hadn't quite realized what the problem was when I wrote
that. I honestly don't know what to do about that. Renaming the
existing option is not great, but having the syntax diverge between
SQL and CLI is not great either. Giving up is also not great. Not sure
what is best.
--
Robert Haas
EDB: http://www.enterprisedb.com
^ permalink raw reply [nested|flat] 29+ messages in thread
* Re: Add --{no-,}bypassrls flags to createuser
2022-04-15 06:33 Re: Add --{no-,}bypassrls flags to createuser Kyotaro Horiguchi <[email protected]>
2022-04-18 13:59 ` Re: Add --{no-,}bypassrls flags to createuser Robert Haas <[email protected]>
2022-04-19 01:50 ` Re: Add --{no-,}bypassrls flags to createuser Kyotaro Horiguchi <[email protected]>
2022-04-19 16:13 ` Re: Add --{no-,}bypassrls flags to createuser Robert Haas <[email protected]>
@ 2022-04-20 08:04 ` Kyotaro Horiguchi <[email protected]>
1 sibling, 0 replies; 29+ messages in thread
From: Kyotaro Horiguchi @ 2022-04-20 08:04 UTC (permalink / raw)
To: [email protected]; +Cc: [email protected]; [email protected]; [email protected]; pgsql-hackers
At Tue, 19 Apr 2022 12:13:51 -0400, Robert Haas <[email protected]> wrote in
> On Mon, Apr 18, 2022 at 9:50 PM Kyotaro Horiguchi
> <[email protected]> wrote:
> > Hmm.. So, "-r/--role" and "-m/--member(ship)" is the (least worse) way
> > to go? Or we can give up adding -m for the reason of being hard to
> > name it..
>
> Hmm, yeah, I hadn't quite realized what the problem was when I wrote
> that. I honestly don't know what to do about that. Renaming the
> existing option is not great, but having the syntax diverge between
> SQL and CLI is not great either. Giving up is also not great. Not sure
> what is best.
Exactly.. So I'm stuckX(
regards.
--
Kyotaro Horiguchi
NTT Open Source Software Center
^ permalink raw reply [nested|flat] 29+ messages in thread
* Re: Add --{no-,}bypassrls flags to createuser
2022-04-15 06:33 Re: Add --{no-,}bypassrls flags to createuser Kyotaro Horiguchi <[email protected]>
2022-04-18 13:59 ` Re: Add --{no-,}bypassrls flags to createuser Robert Haas <[email protected]>
2022-04-19 01:50 ` Re: Add --{no-,}bypassrls flags to createuser Kyotaro Horiguchi <[email protected]>
2022-04-19 16:13 ` Re: Add --{no-,}bypassrls flags to createuser Robert Haas <[email protected]>
@ 2022-04-21 04:29 ` Michael Paquier <[email protected]>
2022-04-21 19:51 ` Re: Add --{no-,}bypassrls flags to createuser Robert Haas <[email protected]>
1 sibling, 1 reply; 29+ messages in thread
From: Michael Paquier @ 2022-04-21 04:29 UTC (permalink / raw)
To: Robert Haas <[email protected]>; +Cc: Kyotaro Horiguchi <[email protected]>; Shinya Kato <[email protected]>; Daniel Gustafsson <[email protected]>; pgsql-hackers
On Tue, Apr 19, 2022 at 12:13:51PM -0400, Robert Haas wrote:
> On Mon, Apr 18, 2022 at 9:50 PM Kyotaro Horiguchi
> <[email protected]> wrote:
>> Hmm.. So, "-r/--role" and "-m/--member(ship)" is the (least worse) way
>> to go? Or we can give up adding -m for the reason of being hard to
>> name it..
>
> Hmm, yeah, I hadn't quite realized what the problem was when I wrote
> that. I honestly don't know what to do about that. Renaming the
> existing option is not great, but having the syntax diverge between
> SQL and CLI is not great either. Giving up is also not great. Not sure
> what is best.
Changing one existing option to mean something entirely different
should be avoided, as this could lead to silent breakages. As the
origin of the problem is that the option --role means "IN ROLE" in the
SQL grammar, we could keep around --role for compatibility while
marking it deprecated, and add two new options whose names would be
more consistent with each other. One choice could be --role-name and
--in-role-name, where --in-role-name maps to the older --role, just to
give an idea.
--
Michael
Attachments:
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^ permalink raw reply [nested|flat] 29+ messages in thread
* Re: Add --{no-,}bypassrls flags to createuser
2022-04-15 06:33 Re: Add --{no-,}bypassrls flags to createuser Kyotaro Horiguchi <[email protected]>
2022-04-18 13:59 ` Re: Add --{no-,}bypassrls flags to createuser Robert Haas <[email protected]>
2022-04-19 01:50 ` Re: Add --{no-,}bypassrls flags to createuser Kyotaro Horiguchi <[email protected]>
2022-04-19 16:13 ` Re: Add --{no-,}bypassrls flags to createuser Robert Haas <[email protected]>
2022-04-21 04:29 ` Re: Add --{no-,}bypassrls flags to createuser Michael Paquier <[email protected]>
@ 2022-04-21 19:51 ` Robert Haas <[email protected]>
2022-04-21 20:21 ` Re: Add --{no-,}bypassrls flags to createuser David G. Johnston <[email protected]>
0 siblings, 1 reply; 29+ messages in thread
From: Robert Haas @ 2022-04-21 19:51 UTC (permalink / raw)
To: Michael Paquier <[email protected]>; +Cc: Kyotaro Horiguchi <[email protected]>; Shinya Kato <[email protected]>; Daniel Gustafsson <[email protected]>; pgsql-hackers
On Thu, Apr 21, 2022 at 12:30 AM Michael Paquier <[email protected]> wrote:
> On Tue, Apr 19, 2022 at 12:13:51PM -0400, Robert Haas wrote:
> > On Mon, Apr 18, 2022 at 9:50 PM Kyotaro Horiguchi
> > <[email protected]> wrote:
> >> Hmm.. So, "-r/--role" and "-m/--member(ship)" is the (least worse) way
> >> to go? Or we can give up adding -m for the reason of being hard to
> >> name it..
> >
> > Hmm, yeah, I hadn't quite realized what the problem was when I wrote
> > that. I honestly don't know what to do about that. Renaming the
> > existing option is not great, but having the syntax diverge between
> > SQL and CLI is not great either. Giving up is also not great. Not sure
> > what is best.
>
> Changing one existing option to mean something entirely different
> should be avoided, as this could lead to silent breakages. As the
> origin of the problem is that the option --role means "IN ROLE" in the
> SQL grammar, we could keep around --role for compatibility while
> marking it deprecated, and add two new options whose names would be
> more consistent with each other. One choice could be --role-name and
> --in-role-name, where --in-role-name maps to the older --role, just to
> give an idea.
I don't think that having both --role and --role-name, doing different
things, is going to be clear at all.
--
Robert Haas
EDB: http://www.enterprisedb.com
^ permalink raw reply [nested|flat] 29+ messages in thread
* Re: Add --{no-,}bypassrls flags to createuser
2022-04-15 06:33 Re: Add --{no-,}bypassrls flags to createuser Kyotaro Horiguchi <[email protected]>
2022-04-18 13:59 ` Re: Add --{no-,}bypassrls flags to createuser Robert Haas <[email protected]>
2022-04-19 01:50 ` Re: Add --{no-,}bypassrls flags to createuser Kyotaro Horiguchi <[email protected]>
2022-04-19 16:13 ` Re: Add --{no-,}bypassrls flags to createuser Robert Haas <[email protected]>
2022-04-21 04:29 ` Re: Add --{no-,}bypassrls flags to createuser Michael Paquier <[email protected]>
2022-04-21 19:51 ` Re: Add --{no-,}bypassrls flags to createuser Robert Haas <[email protected]>
@ 2022-04-21 20:21 ` David G. Johnston <[email protected]>
0 siblings, 0 replies; 29+ messages in thread
From: David G. Johnston @ 2022-04-21 20:21 UTC (permalink / raw)
To: Robert Haas <[email protected]>; +Cc: Michael Paquier <[email protected]>; Kyotaro Horiguchi <[email protected]>; Shinya Kato <[email protected]>; Daniel Gustafsson <[email protected]>; pgsql-hackers
On Thu, Apr 21, 2022 at 12:51 PM Robert Haas <[email protected]> wrote:
> On Thu, Apr 21, 2022 at 12:30 AM Michael Paquier <[email protected]>
> wrote:
> > On Tue, Apr 19, 2022 at 12:13:51PM -0400, Robert Haas wrote:
> > > On Mon, Apr 18, 2022 at 9:50 PM Kyotaro Horiguchi
> > > <[email protected]> wrote:
> > >> Hmm.. So, "-r/--role" and "-m/--member(ship)" is the (least worse) way
> > >> to go? Or we can give up adding -m for the reason of being hard to
> > >> name it..
> > >
> > > Hmm, yeah, I hadn't quite realized what the problem was when I wrote
> > > that. I honestly don't know what to do about that. Renaming the
> > > existing option is not great, but having the syntax diverge between
> > > SQL and CLI is not great either. Giving up is also not great. Not sure
> > > what is best.
> >
> > Changing one existing option to mean something entirely different
> > should be avoided, as this could lead to silent breakages. As the
> > origin of the problem is that the option --role means "IN ROLE" in the
> > SQL grammar, we could keep around --role for compatibility while
> > marking it deprecated, and add two new options whose names would be
> > more consistent with each other. One choice could be --role-name and
> > --in-role-name, where --in-role-name maps to the older --role, just to
> > give an idea.
>
> I don't think that having both --role and --role-name, doing different
> things, is going to be clear at all.
>
>
-g/--role or maybe/additionally (--in-role)?
-m/--role-to or maybe/additionally (--to-role)?
I'm ok with -m/--member as well (like with --role only one role can be
specified per switch instance so member, not membership, the later meaning,
at least for me, the collective).
That -m doesn't match --role-to is no worse than -g not matching --role, a
short option seems worthwhile, and the -m (membership) mnemonic should be
simple to pick-up.
I don't see the addition of "-name" to the option name being beneficial.
Yes, the standard doesn't use the "TO" prefix for "ROLE" - but taking that
liberty for consistency here is very appealing and there isn't another SQL
clause that it would be confused with.
David J.
^ permalink raw reply [nested|flat] 29+ messages in thread
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2022-04-15 06:33 Re: Add --{no-,}bypassrls flags to createuser Kyotaro Horiguchi <[email protected]>
2022-04-18 13:59 ` Re: Add --{no-,}bypassrls flags to createuser Robert Haas <[email protected]>
2022-04-19 01:50 ` Re: Add --{no-,}bypassrls flags to createuser Kyotaro Horiguchi <[email protected]>
2022-04-19 16:13 ` Re: Add --{no-,}bypassrls flags to createuser Robert Haas <[email protected]>
2022-04-20 08:04 ` Re: Add --{no-,}bypassrls flags to createuser Kyotaro Horiguchi <[email protected]>
2022-04-21 04:29 ` Re: Add --{no-,}bypassrls flags to createuser Michael Paquier <[email protected]>
2022-04-21 19:51 ` Re: Add --{no-,}bypassrls flags to createuser Robert Haas <[email protected]>
2022-04-21 20:21 ` Re: Add --{no-,}bypassrls flags to createuser David G. Johnston <[email protected]>
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