Speed up match_eclasses_to_foreign_key_col() when there are many ECs. Check ec_relids before bothering to iterate through the EC members. On a perhaps extreme, but still real-world, query in which match_eclasses_to_foreign_key_col() accounts for the bulk of the planner's runtime, this saves nearly 40% of the runtime. It's a bit of a stopgap fix, but it's simple enough to be back-patched to 9.6 where this code came in; so let's do that.
David Rowley Discussion: https://postgr.es/m/[email protected] Branch ------ REL_10_STABLE Details ------- https://git.postgresql.org/pg/commitdiff/affee8b14c68d8ac8815406be39a68403c4a815e Modified Files -------------- src/backend/optimizer/path/equivclass.c | 8 ++++++++ 1 file changed, 8 insertions(+)
