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Revise hash join code so that we can increase the number of batches

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on-the-fly, and thereby avoid blowing out memory when the planner has
underestimated the hash table size.  Hash join will now obey the
work_mem limit with some faithfulness.  Per my recent proposal
(hash aggregate part isn't done yet though).
This commit is contained in:
Tom Lane
2005-03-06 22:15:05 +00:00
parent 31b6d840f6
commit 849074f9ae
9 changed files with 654 additions and 450 deletions
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26
src/include/executor/nodeHash.h
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/executor/nodeHash.h,v 1.35 2004/12/31 22:03:29 pgsql Exp $
* $PostgreSQL: pgsql/src/include/executor/nodeHash.h,v 1.36 2005/03/06 22:15:05 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -25,18 +25,20 @@ extern void ExecReScanHash(HashState *node, ExprContext *exprCtxt);
extern HashJoinTable ExecHashTableCreate(Hash *node, List *hashOperators);
extern void ExecHashTableDestroy(HashJoinTable hashtable);
extern void ExecHashTableInsert(HashJoinTable hashtable,
ExprContext *econtext,
List *hashkeys);
extern int ExecHashGetBucket(HashJoinTable hashtable,
ExprContext *econtext,
List *hashkeys);
extern int ExecHashGetBatch(int bucketno, HashJoinTable hashtable);
extern HeapTuple ExecScanHashBucket(HashJoinState *hjstate, List *hjclauses,
ExprContext *econtext);
extern void ExecHashTableReset(HashJoinTable hashtable, long ntuples);
HeapTuple tuple,
uint32 hashvalue);
extern uint32 ExecHashGetHashValue(HashJoinTable hashtable,
ExprContext *econtext,
List *hashkeys);
extern void ExecHashGetBucketAndBatch(HashJoinTable hashtable,
uint32 hashvalue,
int *bucketno,
int *batchno);
extern HeapTuple ExecScanHashBucket(HashJoinState *hjstate,
ExprContext *econtext);
extern void ExecHashTableReset(HashJoinTable hashtable);
extern void ExecChooseHashTableSize(double ntuples, int tupwidth,
int *virtualbuckets,
int *physicalbuckets,
int *numbuckets,
int *numbatches);
#endif /* NODEHASH_H */