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Fix another join removal bug: the check on PlaceHolderVars was wrong.

author Tom Lane <tgl@sss.pgh.pa.us>

2010年9月25日 23:03:50 +0000 (19:03 -0400)

committer Tom Lane <tgl@sss.pgh.pa.us>

2010年9月25日 23:03:50 +0000 (19:03 -0400)

commit c8c03d72e10cab3cc47975b2689c8efbb4eade94

tree 8b2d457b2976c808393db387e99d5e61aa5606a1 tree

parent 635de8365f0299cfa2db24c56abcfccb65d020f0 commit | diff

Fix another join removal bug: the check on PlaceHolderVars was wrong.

The previous coding would decide that join removal was unsafe upon finding
a PlaceHolderVar that needed to be evaluated at the inner rel and then used
above the join. However, this fails to cover the case of PlaceHolderVars
that refer to both the inner rel and some other rels. Per bug report from
Andrus.

src/backend/optimizer/plan/analyzejoins.c diff | blob | blame | history

src/test/regress/expected/join.out diff | blob | blame | history

src/test/regress/sql/join.sql diff | blob | blame | history

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