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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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17
src/include/nodes/execnodes.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/nodes/execnodes.h,v 1.122 2004/12/31 22:03:34 pgsql Exp $
* $PostgreSQL: pgsql/src/include/nodes/execnodes.h,v 1.123 2005/03/06 22:15:05 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -15,7 +15,6 @@
#define EXECNODES_H
#include "access/relscan.h"
#include "executor/hashjoin.h"
#include "executor/tuptable.h"
#include "fmgr.h"
#include "nodes/bitmapset.h"
@ -985,11 +984,13 @@ typedef struct MergeJoinState
* HashJoinState information
*
* hj_HashTable hash table for the hashjoin
* (NULL if table not built yet)
* hj_CurHashValue hash value for current outer tuple
* hj_CurBucketNo bucket# for current outer tuple
* hj_CurTuple last inner tuple matched to current outer
* tuple, or NULL if starting search
* (CurBucketNo and CurTuple are meaningless
* unless OuterTupleSlot is nonempty!)
* (CurHashValue, CurBucketNo and CurTuple are
* undefined if OuterTupleSlot is empty!)
* hj_OuterHashKeys the outer hash keys in the hashjoin condition
* hj_InnerHashKeys the inner hash keys in the hashjoin condition
* hj_HashOperators the join operators in the hashjoin condition
@ -998,14 +999,19 @@ typedef struct MergeJoinState
* hj_NullInnerTupleSlot prepared null tuple for left outer joins
* hj_NeedNewOuter true if need new outer tuple on next call
* hj_MatchedOuter true if found a join match for current outer
* hj_hashdone true if hash-table-build phase is done
* ----------------
*/
/* these structs are defined in executor/hashjoin.h: */
typedef struct HashJoinTupleData *HashJoinTuple;
typedef struct HashJoinTableData *HashJoinTable;
typedef struct HashJoinState
{
JoinState js; /* its first field is NodeTag */
List *hashclauses; /* list of ExprState nodes */
HashJoinTable hj_HashTable;
uint32 hj_CurHashValue;
int hj_CurBucketNo;
HashJoinTuple hj_CurTuple;
List *hj_OuterHashKeys; /* list of ExprState nodes */
@ -1016,7 +1022,6 @@ typedef struct HashJoinState
TupleTableSlot *hj_NullInnerTupleSlot;
bool hj_NeedNewOuter;
bool hj_MatchedOuter;
bool hj_hashdone;
} HashJoinState;