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postgresql/contrib/postgres_fdw
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Tom Lane 12cb7ea599 Repair bogus EPQ plans generated for postgres_fdw foreign joins. 
postgres_fdw's postgresGetForeignPlan() assumes without checking that the
outer_plan it's given for a join relation must have a NestLoop, MergeJoin,
or HashJoin node at the top.  That's been wrong at least since commit
4bbf6edfb (which could cause insertion of a Sort node on top) and it seems
like a pretty unsafe thing to Just Assume even without that.

Through blind good fortune, this doesn't seem to have any worse
consequences today than strange EXPLAIN output, but it's clearly trouble
waiting to happen.

To fix, test the node type explicitly before touching Join-specific
fields, and avoid jamming the new tlist into a node type that can't
do projection.  Export a new support function from createplan.c
to avoid building low-level knowledge about the latter into FDWs.

Back-patch to 9.6 where the faulty coding was added.  Note that the
associated regression test cases don't show any changes before v11,
apparently because the tests back-patched with 4bbf6edfb don't actually
exercise the problem case before then (there's no top-level Sort
in those plans).

Discussion: https://postgr.es/m/8946.1544644803@sss.pgh.pa.us
2018-12-12 16:08:30 -05:00
..
expected Fix test case for 'outer pathkeys do not match mergeclauses' fix. 2018-01-30 14:55:14 -05:00
sql Fix test case for 'outer pathkeys do not match mergeclauses' fix. 2018-01-30 14:55:14 -05:00
.gitignore Add postgres_fdw contrib module. 2013-02-21 05:27:16 -05:00
connection.c Re-establish postgres_fdw connections after server or user mapping changes. 2017-07-21 12:51:38 -04:00
deparse.c Fix assorted fallout from IS [NOT] NULL patch. 2016-07-28 16:09:15 -04:00
Makefile Prevent accidental linking of system-supplied copies of libpq.so etc. 2018-07-09 17:23:31 -04:00
option.c pgindent run for 9.6 2016-06-09 18:02:36 -04:00
postgres_fdw--1.0.sql Add postgres_fdw contrib module. 2013-02-21 05:27:16 -05:00
postgres_fdw.c Repair bogus EPQ plans generated for postgres_fdw foreign joins. 2018-12-12 16:08:30 -05:00
postgres_fdw.control Add postgres_fdw contrib module. 2013-02-21 05:27:16 -05:00
postgres_fdw.h pgindent run for 9.6 2016-06-09 18:02:36 -04:00
shippable.c Update copyright for 2016 2016-01-02 13:33:40 -05:00