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If we expect a hash join to be performed in multiple batches, suppress

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"physical tlist" optimization on the outer relation (ie, force a projection
step to occur in its scan).  This avoids storing useless column values when
the outer relation's tuples are written to temporary batch files.

Modified version of a patch by Michael Henderson and Ramon Lawrence.
This commit is contained in:
Tom Lane
2009-03-26 17:15:35 +00:00
parent ee4c187f64
commit f38fbf31f5
5 changed files with 25 additions and 6 deletions
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3
src/backend/nodes/outfuncs.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/nodes/outfuncs.c,v 1.355 2009/03/21 00:04:39 tgl Exp $
* $PostgreSQL: pgsql/src/backend/nodes/outfuncs.c,v 1.356 2009/03/26 17:15:34 tgl Exp $
*
* NOTES
* Every node type that can appear in stored rules' parsetrees *must*
@ -1448,6 +1448,7 @@ _outHashPath(StringInfo str, HashPath *node)
_outJoinPathInfo(str, (JoinPath *) node);
WRITE_NODE_FIELD(path_hashclauses);
WRITE_INT_FIELD(num_batches);
}
static void