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help / color / mirror / Atom feedFrom: Tomas Vondra <[email protected]>
Subject: [PATCH 2/8] Move IS NOT NULL checks to bringetbitmap
Date: Sun, 9 Jun 2019 22:05:39 +0200
---
src/backend/access/brin/brin.c | 116 ++++++++++++++++++++---
src/backend/access/brin/brin_inclusion.c | 62 +-----------
src/backend/access/brin/brin_minmax.c | 62 +-----------
3 files changed, 109 insertions(+), 131 deletions(-)
diff --git a/src/backend/access/brin/brin.c b/src/backend/access/brin/brin.c
index 6777d48faf..caf7b62688 100644
--- a/src/backend/access/brin/brin.c
+++ b/src/backend/access/brin/brin.c
@@ -389,8 +389,10 @@ bringetbitmap(IndexScanDesc scan, TIDBitmap *tbm)
BrinMemTuple *dtup;
BrinTuple *btup = NULL;
Size btupsz = 0;
- ScanKey **keys;
- int *nkeys;
+ ScanKey **keys,
+ **nullkeys;
+ int *nkeys,
+ *nnullkeys;
int keyno;
opaque = (BrinOpaque *) scan->opaque;
@@ -415,10 +417,13 @@ bringetbitmap(IndexScanDesc scan, TIDBitmap *tbm)
/*
* Make room for per-attribute lists of scan keys that we'll pass to the
- * consistent support procedure.
+ * consistent support procedure. We keep null and regular keys separate,
+ * so that we can easily pass regular keys to the consistent function.
*/
keys = palloc0(sizeof(ScanKey *) * bdesc->bd_tupdesc->natts);
+ nullkeys = palloc0(sizeof(ScanKey *) * bdesc->bd_tupdesc->natts);
nkeys = palloc0(sizeof(int) * bdesc->bd_tupdesc->natts);
+ nnullkeys = palloc0(sizeof(int) * bdesc->bd_tupdesc->natts);
/*
* Preprocess the scan keys - split them into per-attribute arrays.
@@ -440,14 +445,12 @@ bringetbitmap(IndexScanDesc scan, TIDBitmap *tbm)
keyattno - 1)->attcollation));
/* First time we see this index attribute, so init as needed. */
- if (!keys[keyattno-1])
+ if (consistentFn[keyattno - 1].fn_oid == InvalidOid)
{
FmgrInfo *tmp;
- keys[keyattno-1] = palloc0(sizeof(ScanKey) * scan->numberOfKeys);
-
- /* First time this column, so look up consistent function */
- Assert(consistentFn[keyattno - 1].fn_oid == InvalidOid);
+ Assert((keys[keyattno - 1] == NULL) && (nkeys[keyattno - 1] == 0));
+ Assert((nullkeys[keyattno - 1] == NULL) && (nnullkeys[keyattno - 1] == 0));
tmp = index_getprocinfo(idxRel, keyattno,
BRIN_PROCNUM_CONSISTENT);
@@ -455,9 +458,23 @@ bringetbitmap(IndexScanDesc scan, TIDBitmap *tbm)
CurrentMemoryContext);
}
- /* Add key to the per-attribute array. */
- keys[keyattno - 1][nkeys[keyattno - 1]] = key;
- nkeys[keyattno - 1]++;
+ /* Add key to the proper per-attribute array. */
+ if (key->sk_flags & SK_ISNULL)
+ {
+ if (!nullkeys[keyattno - 1])
+ nullkeys[keyattno - 1] = palloc0(sizeof(ScanKey) * scan->numberOfKeys);
+
+ nullkeys[keyattno - 1][nnullkeys[keyattno - 1]] = key;
+ nnullkeys[keyattno - 1]++;
+ }
+ else
+ {
+ if (!keys[keyattno - 1])
+ keys[keyattno - 1] = palloc0(sizeof(ScanKey) * scan->numberOfKeys);
+
+ keys[keyattno - 1][nkeys[keyattno - 1]] = key;
+ nkeys[keyattno - 1]++;
+ }
}
/* allocate an initial in-memory tuple, out of the per-range memcxt */
@@ -544,6 +561,83 @@ bringetbitmap(IndexScanDesc scan, TIDBitmap *tbm)
Assert((nkeys[attno - 1] > 0) &&
(nkeys[attno - 1] <= scan->numberOfKeys));
+ /*
+ * First check if there are any IS [NOT] NULL scan keys, and
+ * if we're violating them. In that case we can terminate
+ * early, without invoking the support function.
+ *
+ * As there may be more keys, we can only detemine mismatch
+ * within this loop.
+ */
+ for (keyno = 0; (keyno < nnullkeys[attno - 1]); keyno++)
+ {
+ ScanKey key = nullkeys[attno - 1][keyno];
+
+ Assert(key->sk_attno == bval->bv_attno);
+
+ /* interrupt the loop as soon as we find a mismatch */
+ if (!addrange)
+ break;
+
+ /* handle IS NULL/IS NOT NULL tests */
+ if (key->sk_flags & SK_ISNULL)
+ {
+ /* IS NULL scan key, but range has no NULLs */
+ if (key->sk_flags & SK_SEARCHNULL)
+ {
+ if (!bval->bv_allnulls && !bval->bv_hasnulls)
+ addrange = false;
+
+ continue;
+ }
+
+ /*
+ * For IS NOT NULL, we can only skip ranges that are
+ * known to have only nulls.
+ */
+ if (key->sk_flags & SK_SEARCHNOTNULL)
+ {
+ if (bval->bv_allnulls)
+ addrange = false;
+
+ continue;
+ }
+
+ /*
+ * Neither IS NULL nor IS NOT NULL was used; assume all
+ * indexable operators are strict and thus return false
+ * with NULL value in the scan key.
+ */
+ addrange = false;
+ }
+ }
+
+ /*
+ * If any of the IS [NOT] NULL keys failed, the page range as
+ * a whole can't pass. So terminate the loop.
+ */
+ if (!addrange)
+ break;
+
+ /*
+ * So either there are no IS [NOT] NULL keys, or all passed. If
+ * there are no regular scan keys, we're done - the page range
+ * matches. If there are regular keys, but the page range is
+ * marked as 'all nulls' it can't possibly pass (we're assuming
+ * the operators are strict).
+ */
+
+ /* No regular scan keys - page range as a whole passes. */
+ if (!nkeys[attno - 1])
+ continue;
+
+ /* If it is all nulls, it cannot possibly be consistent. */
+ if (bval->bv_allnulls)
+ {
+ addrange = false;
+ break;
+ }
+
/*
* Check whether the scan key is consistent with the page
* range values; if so, have the pages in the range added
diff --git a/src/backend/access/brin/brin_inclusion.c b/src/backend/access/brin/brin_inclusion.c
index 8968886ff5..22edc6b46f 100644
--- a/src/backend/access/brin/brin_inclusion.c
+++ b/src/backend/access/brin/brin_inclusion.c
@@ -265,63 +265,6 @@ brin_inclusion_consistent(PG_FUNCTION_ARGS)
Oid colloid = PG_GET_COLLATION();
int keyno;
bool matches;
- bool regular_keys = false;
-
- /*
- * First check if there are any IS NULL scan keys, and if we're
- * violating them. In that case we can terminate early, without
- * inspecting the ranges.
- */
- for (keyno = 0; keyno < nkeys; keyno++)
- {
- ScanKey key = keys[keyno];
-
- Assert(key->sk_attno == column->bv_attno);
-
- /* handle IS NULL/IS NOT NULL tests */
- if (key->sk_flags & SK_ISNULL)
- {
- if (key->sk_flags & SK_SEARCHNULL)
- {
- if (column->bv_allnulls || column->bv_hasnulls)
- continue; /* this key is fine, continue */
-
- PG_RETURN_BOOL(false);
- }
-
- /*
- * For IS NOT NULL, we can only skip ranges that are known to have
- * only nulls.
- */
- if (key->sk_flags & SK_SEARCHNOTNULL)
- {
- if (column->bv_allnulls)
- PG_RETURN_BOOL(false);
-
- continue;
- }
-
- /*
- * Neither IS NULL nor IS NOT NULL was used; assume all indexable
- * operators are strict and return false.
- */
- PG_RETURN_BOOL(false);
- }
- else
- /* note we have regular (non-NULL) scan keys */
- regular_keys = true;
- }
-
- /*
- * If the page range is all nulls, it cannot possibly be consistent if
- * there are some regular scan keys.
- */
- if (column->bv_allnulls && regular_keys)
- PG_RETURN_BOOL(false);
-
- /* If there are no regular keys, the page range is considered consistent. */
- if (!regular_keys)
- PG_RETURN_BOOL(true);
/* It has to be checked, if it contains elements that are not mergeable. */
if (DatumGetBool(column->bv_values[INCLUSION_UNMERGEABLE]))
@@ -333,9 +276,8 @@ brin_inclusion_consistent(PG_FUNCTION_ARGS)
{
ScanKey key = keys[keyno];
- /* ignore IS NULL/IS NOT NULL tests handled above */
- if (key->sk_flags & SK_ISNULL)
- continue;
+ /* NULL keys are handled and filtered-out in bringetbitmap */
+ Assert(!(key->sk_flags & SK_ISNULL));
matches = inclusion_consistent_key(bdesc, column, key, colloid);
diff --git a/src/backend/access/brin/brin_minmax.c b/src/backend/access/brin/brin_minmax.c
index 1219a3a2ab..7a7bd21cec 100644
--- a/src/backend/access/brin/brin_minmax.c
+++ b/src/backend/access/brin/brin_minmax.c
@@ -153,63 +153,6 @@ brin_minmax_consistent(PG_FUNCTION_ARGS)
Oid colloid = PG_GET_COLLATION();
Datum matches;
int keyno;
- bool regular_keys = false;
-
- /*
- * First check if there are any IS NULL scan keys, and if we're
- * violating them. In that case we can terminate early, without
- * inspecting the ranges.
- */
- for (keyno = 0; keyno < nkeys; keyno++)
- {
- ScanKey key = keys[keyno];
-
- Assert(key->sk_attno == column->bv_attno);
-
- /* handle IS NULL/IS NOT NULL tests */
- if (key->sk_flags & SK_ISNULL)
- {
- if (key->sk_flags & SK_SEARCHNULL)
- {
- if (column->bv_allnulls || column->bv_hasnulls)
- continue; /* this key is fine, continue */
-
- PG_RETURN_BOOL(false);
- }
-
- /*
- * For IS NOT NULL, we can only skip ranges that are known to have
- * only nulls.
- */
- if (key->sk_flags & SK_SEARCHNOTNULL)
- {
- if (column->bv_allnulls)
- PG_RETURN_BOOL(false);
-
- continue;
- }
-
- /*
- * Neither IS NULL nor IS NOT NULL was used; assume all indexable
- * operators are strict and return false.
- */
- PG_RETURN_BOOL(false);
- }
- else
- /* note we have regular (non-NULL) scan keys */
- regular_keys = true;
- }
-
- /*
- * If the page range is all nulls, it cannot possibly be consistent if
- * there are some regular scan keys.
- */
- if (column->bv_allnulls && regular_keys)
- PG_RETURN_BOOL(false);
-
- /* If there are no regular keys, the page range is considered consistent. */
- if (!regular_keys)
- PG_RETURN_BOOL(true);
matches = true;
@@ -217,9 +160,8 @@ brin_minmax_consistent(PG_FUNCTION_ARGS)
{
ScanKey key = keys[keyno];
- /* ignore IS NULL/IS NOT NULL tests handled above */
- if (key->sk_flags & SK_ISNULL)
- continue;
+ /* NULL keys are handled and filtered-out in bringetbitmap */
+ Assert(!(key->sk_flags & SK_ISNULL));
matches = minmax_consistent_key(bdesc, column, key, colloid);
--
2.25.4
--jsivyprvf2oxfjz3
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename="0003-Move-processing-of-NULLs-from-BRIN-support--20200807.patch"
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