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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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8
src/include/executor/nodeHashjoin.h
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@@ -1,13 +1,13 @@
/*-------------------------------------------------------------------------
*
* nodeHashjoin.h
*
* prototypes for nodeHashjoin.c
*
*
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/executor/nodeHashjoin.h,v 1.28 2004/12/31 22:03:29 pgsql Exp $
* $PostgreSQL: pgsql/src/include/executor/nodeHashjoin.h,v 1.29 2005/03/06 22:15:05 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -15,6 +15,7 @@
#define NODEHASHJOIN_H
#include "nodes/execnodes.h"
#include "storage/buffile.h"
extern int ExecCountSlotsHashJoin(HashJoin *node);
extern HashJoinState *ExecInitHashJoin(HashJoin *node, EState *estate);
@@ -22,6 +23,7 @@ extern TupleTableSlot *ExecHashJoin(HashJoinState *node);
extern void ExecEndHashJoin(HashJoinState *node);
extern void ExecReScanHashJoin(HashJoinState *node, ExprContext *exprCtxt);
extern void ExecHashJoinSaveTuple(HeapTuple heapTuple, BufFile *file);
extern void ExecHashJoinSaveTuple(HeapTuple heapTuple, uint32 hashvalue,
BufFile **fileptr);
#endif /* NODEHASHJOIN_H */