Обсуждение: pgsql: Adjust constant-folding of CASE expressions so that the simple
pgsql: Adjust constant-folding of CASE expressions so that the simple
От
tgl@svr1.postgresql.org (Tom Lane)
Дата:
Log Message: ----------- 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. Modified Files: -------------- pgsql/src/backend/optimizer/util: clauses.c (r1.187 -> r1.188) (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/util/clauses.c.diff?r1=1.187&r2=1.188) pgsql/src/test/regress/expected: case.out (r1.8 -> r1.9) (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/expected/case.out.diff?r1=1.8&r2=1.9) pgsql/src/test/regress/sql: case.sql (r1.5 -> r1.6) (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/sql/case.sql.diff?r1=1.5&r2=1.6)