Обсуждение: pgsql: Prohibit pushing subqueries containing window functioncalculati
Prohibit pushing subqueries containing window function calculation to workers. Allowing window function calculation in workers leads to inconsistent results because if the input row ordering is not fully deterministic, the output of window functions might vary across workers. The fix is to treat them as parallel-restricted. In the passing, improve the coding pattern in max_parallel_hazard_walker so that it has a chain of mutually-exclusive if ... else if ... else if ... else if ... IsA tests. Reported-by: Marko Tiikkaja Bug: 15324 Author: Amit Kapila Reviewed-by: Tom Lane Backpatch-through: 9.6 Discussion: https://postgr.es/m/CAL9smLAnfPJCDUUG4ckX2iznj53V7VSMsYefzZieN93YxTNOcw@mail.gmail.com Branch ------ REL9_6_STABLE Details ------- https://git.postgresql.org/pg/commitdiff/f658235a448aa9462249f9d3448168be1e63a55f Modified Files -------------- src/backend/optimizer/util/clauses.c | 14 ++++++++++++++ src/test/regress/expected/select_parallel.out | 23 +++++++++++++++++++++++ src/test/regress/sql/select_parallel.sql | 5 +++++ 3 files changed, 42 insertions(+)