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Upgrade planner and executor to allow multiple hash keys for a hash join,
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.
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@ -7,7 +7,7 @@
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* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $Id: execnodes.h,v 1.80 2002/11/25 21:29:42 tgl Exp $
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* $Id: execnodes.h,v 1.81 2002/11/30 00:08:20 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -618,7 +618,8 @@ typedef struct MergeJoinState
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* tuple, or NULL if starting search
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* (CurBucketNo and CurTuple are meaningless
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* unless OuterTupleSlot is nonempty!)
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* hj_InnerHashKey the inner hash key in the hashjoin condition
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* hj_OuterHashKeys the outer hash keys in the hashjoin condition
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* hj_InnerHashKeys the inner hash keys in the hashjoin condition
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* hj_OuterTupleSlot tuple slot for outer tuples
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* hj_HashTupleSlot tuple slot for hashed tuples
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* hj_NullInnerTupleSlot prepared null tuple for left outer joins
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@ -633,7 +634,8 @@ typedef struct HashJoinState
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HashJoinTable hj_HashTable;
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int hj_CurBucketNo;
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HashJoinTuple hj_CurTuple;
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Node *hj_InnerHashKey;
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List *hj_OuterHashKeys;
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List *hj_InnerHashKeys;
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TupleTableSlot *hj_OuterTupleSlot;
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TupleTableSlot *hj_HashTupleSlot;
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TupleTableSlot *hj_NullInnerTupleSlot;
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