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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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8
src/include/nodes/execnodes.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: execnodes.h,v 1.80 2002/11/25 21:29:42 tgl Exp $
* $Id: execnodes.h,v 1.81 2002/11/30 00:08:20 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -618,7 +618,8 @@ typedef struct MergeJoinState
* tuple, or NULL if starting search
* (CurBucketNo and CurTuple are meaningless
* unless OuterTupleSlot is nonempty!)
* hj_InnerHashKey the inner hash key in the hashjoin condition
* hj_OuterHashKeys the outer hash keys in the hashjoin condition
* hj_InnerHashKeys the inner hash keys in the hashjoin condition
* hj_OuterTupleSlot tuple slot for outer tuples
* hj_HashTupleSlot tuple slot for hashed tuples
* hj_NullInnerTupleSlot prepared null tuple for left outer joins
@ -633,7 +634,8 @@ typedef struct HashJoinState
HashJoinTable hj_HashTable;
int hj_CurBucketNo;
HashJoinTuple hj_CurTuple;
Node *hj_InnerHashKey;
List *hj_OuterHashKeys;
List *hj_InnerHashKeys;
TupleTableSlot *hj_OuterTupleSlot;
TupleTableSlot *hj_HashTupleSlot;
TupleTableSlot *hj_NullInnerTupleSlot;