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: Adjust join_search_one_level's handling of clauseless joins. |
Date: | 2012-04-21 00:11:48 |
Message-ID: | E1SLNvY-000400-72@gemulon.postgresql.org |
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Lists: | pgsql-committers |
Adjust join_search_one_level's handling of clauseless joins.
For an initial relation that lacks any join clauses (that is, it has to be
cartesian-product-joined to the rest of the query), we considered only
cartesian joins with initial rels appearing later in the initial-relations
list. This creates an undesirable dependency on FROM-list order. We would
never fail to find a plan, but perhaps we might not find the best available
plan. Noted while discussing the logic with Amit Kapila.
Improve the comments a bit in this area, too.
Arguably this is a bug fix, but given the lack of complaints from the
field I'll refrain from back-patching.
Branch
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master
Details
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http://git.postgresql.org/pg/commitdiff/1f0363001166ef6a43619846e44cfb9dbe7335ed
Modified Files
--------------
src/backend/optimizer/path/joinrels.c | 46 +++++++++++++++++++-------------
1 files changed, 27 insertions(+), 19 deletions(-)
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