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Improve UniquePath logic to detect the case where the input is already

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known unique (eg, it is a SELECT DISTINCT ... subquery), and not do a
redundant unique-ification step.
This commit is contained in:
Tom Lane
2004-01-05 18:04:39 +00:00
parent cce442da6d
commit 5c74ce23db
6 changed files with 72 additions and 15 deletions
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4
src/backend/nodes/outfuncs.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/nodes/outfuncs.c,v 1.226 2004/01/05 05:07:35 tgl Exp $
* $PostgreSQL: pgsql/src/backend/nodes/outfuncs.c,v 1.227 2004/01/05 18:04:38 tgl Exp $
*
* NOTES
* Every node type that can appear in stored rules' parsetrees *must*
@ -1023,7 +1023,7 @@ _outUniquePath(StringInfo str, UniquePath *node)
_outPathInfo(str, (Path *) node);
WRITE_NODE_FIELD(subpath);
WRITE_BOOL_FIELD(use_hash);
WRITE_ENUM_FIELD(umethod, UniquePathMethod);
WRITE_FLOAT_FIELD(rows, "%.0f");
}