git.postgresql.org Git - postgresql.git/commit
2020年10月12日 07:41:16 +0000 (20:41 +1300)
2020年10月12日 11:26:49 +0000 (00:26 +1300)
commit f0f13a3a08b2757997410f3a1c38bdc22973c525
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 <gregn4422@gmail.com>
Discussion: https://postgr.es/m/CAJcOf-cXnB5cnMKqWEp2E2z7Mvcd04iLVmV%3DqpFJrR3AcrTS3g%40mail.gmail.com
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