Don't assume a subquery's output is unique if there's a SRF in its tlist. While the x output of "select x from t group by x" can be presumed unique, this does not hold for "select x, generate_series(1,10) from t group by x", because we may expand the set-returning function after the grouping step. (Perhaps that should be re-thought; but considering all the other oddities involved with SRFs in targetlists, it seems unlikely we'll change it.) Put a check in query_is_distinct_for() so it's not fooled by such cases.
Back-patch to all supported branches. David Rowley Branch ------ REL8_4_STABLE Details ------- http://git.postgresql.org/pg/commitdiff/2e7469dc8b3bac4fe0f9bd042aaf802132efde85 Modified Files -------------- src/backend/optimizer/util/pathnode.c | 12 ++++++++++++ src/test/regress/expected/subselect.out | 12 ++++++++++++ src/test/regress/sql/subselect.sql | 8 ++++++++ 3 files changed, 32 insertions(+) -- Sent via pgsql-committers mailing list ([email protected]) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-committers
