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postgresql/contrib/postgres_fdw
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Tom Lane b9eb0412ff Fix postgres_fdw to check shippability of sort clauses properly. 
postgres_fdw would push ORDER BY clauses to the remote side without
verifying that the sort operator is safe to ship.  Moreover, it failed
to print a suitable USING clause if the sort operator isn't default
for the sort expression's type.  The net result of this is that the
remote sort might not have anywhere near the semantics we expect,
which'd be disastrous for locally-performed merge joins in particular.

We addressed similar issues in the context of ORDER BY within an
aggregate function call in commit 7012b132d, but failed to notice
that query-level ORDER BY was broken.  Thus, much of the necessary
logic already existed, but it requires refactoring to be usable
in both cases.

Back-patch to all supported branches.  In HEAD only, remove the
core code's copy of find_em_expr_for_rel, which is no longer used
and really should never have been pushed into equivclass.c in the
first place.

Ronan Dunklau, per report from David Rowley;
reviews by David Rowley, Ranier Vilela, and myself

Discussion: https://postgr.es/m/CAApHDvr4OeC2DBVY--zVP83-K=bYrTD7F8SZDhN4g+pj2f2S-A@mail.gmail.com
2022-03-31 14:29:24 -04:00
..
expected Fix postgres_fdw to check shippability of sort clauses properly. 2022-03-31 14:29:24 -04:00
sql Fix postgres_fdw to check shippability of sort clauses properly. 2022-03-31 14:29:24 -04:00
.gitignore Add postgres_fdw contrib module. 2013-02-21 05:27:16 -05:00
connection.c postgres_fdw: Fix unexpected reporting of empty message. 2021-12-03 17:37:26 +09:00
deparse.c Fix postgres_fdw to check shippability of sort clauses properly. 2022-03-31 14:29:24 -04:00
Makefile Prevent accidental linking of system-supplied copies of libpq.so etc. 2018-04-03 16:26:05 -04:00
option.c Avoid using ambiguous word "non-negative" in error messages. 2021-07-28 01:24:51 +09:00
postgres_fdw--1.0.sql Add postgres_fdw contrib module. 2013-02-21 05:27:16 -05:00
postgres_fdw.c Fix postgres_fdw to check shippability of sort clauses properly. 2022-03-31 14:29:24 -04:00
postgres_fdw.control Add postgres_fdw contrib module. 2013-02-21 05:27:16 -05:00
postgres_fdw.h Fix postgres_fdw to check shippability of sort clauses properly. 2022-03-31 14:29:24 -04:00
shippable.c Update copyright for 2018 2018-01-02 23:30:12 -05:00