Fix estimates for ModifyTable paths without RETURNING. In the past, we always estimated that a ModifyTable node would emit the same number of rows as its subpaths. Without a RETURNING clause, the correct estimate is zero. Fix, in preparation for a proposed parallel write patch that is sensitive to that number.
A remaining problem is that for RETURNING queries, the estimated width is based on subpath output rather than the RETURNING tlist. Reviewed-by: Greg Nancarrow <[email protected]> Discussion: https://postgr.es/m/CAJcOf-cXnB5cnMKqWEp2E2z7Mvcd04iLVmV%3DqpFJrR3AcrTS3g%40mail.gmail.com Branch ------ master Details ------- https://git.postgresql.org/pg/commitdiff/f0f13a3a08b2757997410f3a1c38bdc22973c525 Modified Files -------------- src/backend/optimizer/util/pathnode.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-)
