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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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4
src/backend/optimizer/util/pathnode.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/util/pathnode.c,v 1.80 2002/11/24 21:52:14 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/util/pathnode.c,v 1.81 2002/11/30 00:08:20 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -616,7 +616,7 @@ create_mergejoin_path(Query *root,
* 'outer_path' is the cheapest outer path
* 'inner_path' is the cheapest inner path
* 'restrict_clauses' are the RestrictInfo nodes to apply at the join
* 'hashclauses' is a list of the hash join clause (always a 1-element list)
* 'hashclauses' are the RestrictInfo nodes to use as hash clauses
* (this should be a subset of the restrict_clauses list)
*/
HashPath *