Fix booltestsel() for case where we have NULL stats but not MCV stats. In a boolean column that contains mostly nulls, ANALYZE might not find enough non-null values to populate the most-common-values stats, but it would still create a pg_statistic entry with stanullfrac set. The logic in booltestsel() for this situation did the wrong thing for "col IS NOT TRUE" and "col IS NOT FALSE" tests, forgetting that null values would satisfy these tests (so that the true selectivity would be close to one, not close to zero). Per bug #8274.
Fix by Andrew Gierth, some comment-smithing by me. Branch ------ REL9_2_STABLE Details ------- http://git.postgresql.org/pg/commitdiff/9f8254c18cd73404abce53d832723fe104caef14 Modified Files -------------- src/backend/utils/adt/selfuncs.c | 22 ++++++++++------------ 1 file changed, 10 insertions(+), 12 deletions(-) -- Sent via pgsql-committers mailing list ([email protected]) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-committers
