Fix hash table size estimation error in choose_hashed_distinct(). We should account for the per-group hashtable entry overhead when considering whether to use a hash aggregate to implement DISTINCT. The comparable logic in choose_hashed_grouping() gets this right, but I think I omitted it here in the mistaken belief that there would be no overhead if there were no aggregate functions to be evaluated. This can result in more than 2X underestimate of the hash table size, if the tuples being aggregated aren't very wide. Per report from Tomas Vondra.
This bug is of long standing, but per discussion we'll only back-patch into 9.3. Changing the estimation behavior in stable branches seems to carry too much risk of destabilizing plan choices for already-tuned applications. Branch ------ REL9_3_STABLE Details ------- http://git.postgresql.org/pg/commitdiff/e6d3f5b35edad5452936bf4842167fa00c8b64b8 Modified Files -------------- src/backend/optimizer/plan/planner.c | 4 ++++ 1 file changed, 4 insertions(+) -- Sent via pgsql-committers mailing list ([email protected]) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-committers
