Fix tuple_fraction calculation in generate_orderedappend_paths() 6b94e7a6da adjusted generate_orderedappend_paths() to consider fractional paths. However, it didn't manage to interpret the tuple_fraction value correctly. According to the header comment of grouping_planner(), the tuple_fraction >= 1 specifies the absolute number of expected tuples. That number must be divided by the expected total number of tuples to get the actual fraction.
Even though this is a bug fix, we don't backpatch it. The risks of the side effects of plan changes on stable branches are too high. Reported-by: Andrei Lepikhov <lepi...@gmail.com> Discussion: https://postgr.es/m/3ca271fa-ca5c-458c-8934-eb148622b270%40gmail.com Author: Andrei Lepikhov <lepi...@gmail.com> Reviewed-by: Junwang Zhao <zhjw...@gmail.com> Reviewed-by: Alvaro Herrera <alvhe...@alvh.no-ip.org> Reviewed-by: Tom Lane <t...@sss.pgh.pa.us> Branch ------ master Details ------- https://git.postgresql.org/pg/commitdiff/3d3a81fc24b07f04df81d898f6b4e85c553ef604 Modified Files -------------- src/backend/optimizer/path/allpaths.c | 12 +++++++++++- src/test/regress/expected/partition_join.out | 18 ++++++++++++++++++ src/test/regress/sql/partition_join.sql | 3 +++ 3 files changed, 32 insertions(+), 1 deletion(-)
