From: | tgl(at)svr1(dot)postgresql(dot)org (Tom Lane) |
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To: | pgsql-committers(at)postgresql(dot)org |
Subject: | pgsql: Adjust constant-folding of CASE expressions so that the simple |
Date: | 2005-02-02 21:49:52 |
Message-ID: | 20050202214952.929B38B9D70@svr1.postgresql.org |
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Lists: | pgsql-committers |
Log Message:
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Adjust constant-folding of CASE expressions so that the simple comparison
form of CASE (eg, CASE 0 WHEN 1 THEN ...) can be constant-folded as it
was in 7.4. Also, avoid constant-folding result expressions that are
certainly unreachable --- the former coding was a bit cavalier about this
and could generate unexpected results for all-constant CASE expressions.
Add regression test cases. Per report from Vlad Marchenko.
Tags:
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REL8_0_STABLE
Modified Files:
--------------
pgsql/src/backend/optimizer/util:
clauses.c (r1.186.4.1 -> r1.186.4.2)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/util/clauses.c.diff?r1=1.186.4.1&r2=1.186.4.2)
pgsql/src/test/regress/expected:
case.out (r1.8 -> r1.8.4.1)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/expected/case.out.diff?r1=1.8&r2=1.8.4.1)
pgsql/src/test/regress/sql:
case.sql (r1.5 -> r1.5.4.1)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/sql/case.sql.diff?r1=1.5&r2=1.5.4.1)
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