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Rewrite hash join to use simple linked lists instead of a

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fixed-size hashtable.  This should prevent 'hashtable out of memory' errors,
unless you really do run out of memory.  Note: target size for hashtable
is now taken from -S postmaster switch, not -B, since it is local memory
in the backend rather than shared memory.
This commit is contained in:
Tom Lane
1999-05-18 21:33:06 +00:00
parent d261a5ec86
commit 26069a58e8
5 changed files with 493 additions and 863 deletions
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16
src/include/executor/nodeHash.h
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@ -6,7 +6,7 @@
*
* Copyright (c) 1994, Regents of the University of California
*
* $Id: nodeHash.h,v 1.11 1999/02/13 23:21:25 momjian Exp $
* $Id: nodeHash.h,v 1.12 1999/05/18 21:33:05 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -18,7 +18,6 @@
#include "nodes/execnodes.h"
#include "nodes/pg_list.h"
#include "nodes/plannodes.h"
#include "storage/fd.h"
#include "utils/syscache.h"
extern TupleTableSlot *ExecHash(Hash *node);
@ -26,15 +25,14 @@ extern bool ExecInitHash(Hash *node, EState *estate, Plan *parent);
extern int ExecCountSlotsHash(Hash *node);
extern void ExecEndHash(Hash *node);
extern HashJoinTable ExecHashTableCreate(Hash *node);
extern void ExecHashTableInsert(HashJoinTable hashtable, ExprContext *econtext,
Var *hashkey, File *batches);
extern void ExecHashTableDestroy(HashJoinTable hashtable);
extern void ExecHashTableInsert(HashJoinTable hashtable, ExprContext *econtext,
Var *hashkey);
extern int ExecHashGetBucket(HashJoinTable hashtable, ExprContext *econtext,
Var *hashkey);
extern HeapTuple ExecScanHashBucket(HashJoinState *hjstate, HashBucket bucket,
HeapTuple curtuple, List *hjclauses,
ExprContext *econtext);
extern void ExecHashTableReset(HashJoinTable hashtable, int ntuples);
Var *hashkey);
extern HeapTuple ExecScanHashBucket(HashJoinState *hjstate, List *hjclauses,
ExprContext *econtext);
extern void ExecHashTableReset(HashJoinTable hashtable, long ntuples);
extern void ExecReScanHash(Hash *node, ExprContext *exprCtxt, Plan *parent);
#endif /* NODEHASH_H */