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Improve hash join to discard input tuples immediately if they can't

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match because they contain a null join key (and the join operator is
known strict).  Improves performance significantly when the inner
relation contains a lot of nulls, as per bug #2930.
This commit is contained in:
Tom Lane
2007-01-28 23:21:26 +00:00
parent 28c480e9ae
commit b39e91501c
4 changed files with 70 additions and 25 deletions
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8
src/include/executor/nodeHash.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/executor/nodeHash.h,v 1.42 2007/01/05 22:19:54 momjian Exp $
* $PostgreSQL: pgsql/src/include/executor/nodeHash.h,v 1.43 2007/01/28 23:21:26 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -28,9 +28,11 @@ extern void ExecHashTableDestroy(HashJoinTable hashtable);
extern void ExecHashTableInsert(HashJoinTable hashtable,
TupleTableSlot *slot,
uint32 hashvalue);
extern uint32 ExecHashGetHashValue(HashJoinTable hashtable,
extern bool ExecHashGetHashValue(HashJoinTable hashtable,
ExprContext *econtext,
List *hashkeys);
List *hashkeys,
bool keep_nulls,
uint32 *hashvalue);
extern void ExecHashGetBucketAndBatch(HashJoinTable hashtable,
uint32 hashvalue,
int *bucketno,