Don't call IS_DUMMY_REL() when cheapest_total_path might be junk. Unlike the previous coding, this might result in a Gather per Append subplan when the target list is parallel-restricted, but such a plan is probably worth considering in that case, since a single Gather on top of the entire Append is impossible.
Per Andres Freund and the buildfarm. Discussion: http://postgr.es/m/20180330050351.bmxx4cdtz67cz...@alap3.anarazel.de Branch ------ master Details ------- https://git.postgresql.org/pg/commitdiff/96030f9a481a78483945447e122a387902a4549b Modified Files -------------- src/backend/optimizer/plan/planner.c | 32 +++++++++++++++++--------------- 1 file changed, 17 insertions(+), 15 deletions(-)
