From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
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To: | pgsql-committers(at)postgresql(dot)org |
Subject: | pgsql: Fix thinko in new match_join_clauses_to_index() logic. |
Date: | 2012-02-28 23:10:52 |
Message-ID: | E1S2WC4-0003Pp-KI@gemulon.postgresql.org |
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Lists: | pgsql-committers |
Fix thinko in new match_join_clauses_to_index() logic.
We don't need to constrain the other side of an indexable join clause to
not be below an outer join; an example here is
SELECT FROM t1 LEFT JOIN t2 ON t1.a = t2.b LEFT JOIN t3 ON t2.c = t3.d;
We can consider an inner indexscan on t3.d using c = d as indexqual, even
though t2.c is potentially nulled by a previous outer join. The comparable
logic in orindxpath.c has always worked that way, but I was being overly
cautious here.
Branch
------
master
Details
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http://git.postgresql.org/pg/commitdiff/0140a11b9ba5b22e1e4807e178bca770d46c3e28
Modified Files
--------------
src/backend/optimizer/path/indxpath.c | 8 ++++----
1 files changed, 4 insertions(+), 4 deletions(-)
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