Thread: pgsql: Consider unsorted paths in generate_useful_gather_paths
Consider unsorted paths in generate_useful_gather_paths generate_useful_gather_paths used to skip unsorted paths (without any pathkeys), but that is unnecessary - the later code actually can handle such paths just fine by adding a Sort node. This is clearly a thinko, preventing construction of useful plans. Backpatch to 13, where Incremental Sort was introduced. Author: James Coleman Reviewed-by: Tomas Vondra Backpatch-through: 13 Discussion: https://postgr.es/m/CAAaqYe8cK3g5CfLC4w7bs=hC0mSksZC=H5M8LSchj5e5OxpTAg@mail.gmail.com Branch ------ REL_13_STABLE Details ------- https://git.postgresql.org/pg/commitdiff/ea190ed14b4b75b38a490707d5d08231dcacfb8c Modified Files -------------- src/backend/optimizer/path/allpaths.c | 11 ++--------- src/test/regress/expected/incremental_sort.out | 13 +++++++++++++ src/test/regress/sql/incremental_sort.sql | 4 ++++ 3 files changed, 19 insertions(+), 9 deletions(-)