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Fix wrong costing of Sort under Gather Merge.

author Robert Haas <rhaas@postgresql.org>

2017年3月22日 18:42:03 +0000 (14:42 -0400)

committer Robert Haas <rhaas@postgresql.org>

2017年3月22日 18:45:14 +0000 (14:45 -0400)

commit dc02c7bca4dccf7de278cdc6b3325a829e75b252

tree 27944d3e204c2ef613c1a9e7e2b40d5424118d07 tree

parent 6b76f1bb58f53aec25cfec76391270ea36ad1170 commit | diff

Fix wrong costing of Sort under Gather Merge.

There's no mechanism for such a sort to become a top-N sort, so we
should pass -1 rather than limit_tuples to cost_sort().

Rushabh Lathia, per a report from Mithun Cy

Discussion: http://postgr.es/m/CAGPqQf1akRcSgC9=6iwx=sEPap9UvPpHJLzg8_N+OuHdb6fL+g@mail.gmail.com

src/backend/optimizer/plan/planner.c diff | blob | blame | history

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