Обсуждение: pgsql: Fix usage of aggregate pathkeys in group_keys_reorder_by_pathkey
Fix usage of aggregate pathkeys in group_keys_reorder_by_pathkeys() group_keys_reorder_by_pathkeys() function searched for matching pathkeys within root->group_pathkeys. That could lead to picking an aggregate pathkey and using its pathkey->pk_eclass->ec_sortref as an argument of get_sortgroupref_clause_noerr(). Given that ec_sortref of an aggregate pathkey references aggregate targetlist not query targetlist, this leads to incorrect query optimization. Fix this by looking for matching pathkeys only within the first num_groupby_pathkeys pathkeys. Reported-by: David G. Johnston Discussion: https://postgr.es/m/CAKFQuwY3Ek%3DcLThgd8FdaSc5JRDVt0FaV00gMcWra%2BTAR4gGUw%40mail.gmail.com Author: Andrei Lepikhov, Alexander Korotkov Branch ------ master Details ------- https://git.postgresql.org/pg/commitdiff/c01f6ef46c8f0ab3faa54e8f040da6e9ddc7fe5b Modified Files -------------- src/backend/optimizer/path/pathkeys.c | 25 +++++++++++++++++++++---- src/test/regress/expected/aggregates.out | 24 ++++++++++++++++++++++++ src/test/regress/sql/aggregates.sql | 19 +++++++++++++++++++ 3 files changed, 64 insertions(+), 4 deletions(-)