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Upgrade planner and executor to allow multiple hash keys for a hash join,

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instead of only one.  This should speed up planning (only one hash path
to consider for a given pair of relations) as well as allow more effective
hashing, when there are multiple hashable joinclauses.
This commit is contained in:
Tom Lane
2002-11-30 00:08:22 +00:00
parent f68f11928d
commit ddb2d78de0
14 changed files with 182 additions and 133 deletions
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6
src/include/executor/nodeHash.h
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: nodeHash.h,v 1.25 2002/11/06 22:31:24 tgl Exp $
* $Id: nodeHash.h,v 1.26 2002/11/30 00:08:20 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -24,10 +24,10 @@ extern HashJoinTable ExecHashTableCreate(Hash *node);
extern void ExecHashTableDestroy(HashJoinTable hashtable);
extern void ExecHashTableInsert(HashJoinTable hashtable,
ExprContext *econtext,
Node *hashkey);
List *hashkeys);
extern int ExecHashGetBucket(HashJoinTable hashtable,
ExprContext *econtext,
Node *hashkey);
List *hashkeys);
extern HeapTuple ExecScanHashBucket(HashJoinState *hjstate, List *hjclauses,
ExprContext *econtext);
extern void ExecHashTableReset(HashJoinTable hashtable, long ntuples);