Stop btree indexscans upon reaching nulls in either direction. The existing scan-direction-sensitive tests were overly complex, and failed to stop the scan in cases where it's perfectly legitimate to do so. Per bug #6278 from Maksym Boguk.
Back-patch to 8.3, which is as far back as the patch applies easily. Doesn't seem worth sweating over a relatively minor performance issue in 8.2 at this late date. (But note that this was a performance regression from 8.1 and before, so 8.2 is being left as an outlier.) Branch ------ master Details ------- http://git.postgresql.org/pg/commitdiff/6980f817e83c242c29c84a44f1e1f09e566439b7 Modified Files -------------- src/backend/access/nbtree/nbtutils.c | 107 +++++++++++++-------------------- 1 files changed, 42 insertions(+), 65 deletions(-) -- Sent via pgsql-committers mailing list ([email protected]) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-committers
