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(parent: 5c625a9) | patch
Recognize that IN subqueries return already-unique results if they use
authorTom Lane <tgl@sss.pgh.pa.us>
Mon, 19 Jan 2004 03:49:41 +0000 (03:49 +0000)
committerTom Lane <tgl@sss.pgh.pa.us>
Mon, 19 Jan 2004 03:49:41 +0000 (03:49 +0000)
commit864412fd0a1e8983d4241383f13a5492bc795765
tree0c2bfa80e1a4eca68f6e51b5595a2ebaf2f5becftree | snapshot
parent5c625a9326e37093420044dcc70477cdbdd5f001commit | diff
Recognize that IN subqueries return already-unique results if they use
UNION/INTERSECT/EXCEPT (without ALL).  This adds on to the previous
optimization for subqueries using DISTINCT.
src/backend/optimizer/util/pathnode.c diff | blob | history
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