Thread: pgsql: Fix costing of parallel hash joins.
Fix costing of parallel hash joins. Commit 1804284042e659e7d16904e7bbb0ad546394b6a3 established that single-batch parallel-aware hash joins could create one large shared hash table using the combined work_mem budget of all participants. The costing accidentally assumed that parallel-oblivious hash joins could also do that. The documentation for initial_cost_hashjoin() also failed to mention the new argument. Repair. Author: Thomas Munro Reported-By: Antonin Houska Reviewed-By: Antonin Houska Discussion: https://postgr.es/m/12441.1513935950%40localhost Branch ------ master Details ------- https://git.postgresql.org/pg/commitdiff/5b804cc168a52039be02f392780b9e8c8db74412 Modified Files -------------- src/backend/optimizer/path/costsize.c | 2 ++ src/backend/optimizer/path/joinpath.c | 2 +- 2 files changed, 3 insertions(+), 1 deletion(-)