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Tom Lane 79df1d20c5 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		4 years ago
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expected	Fix postgres_fdw to check shippability of sort clauses properly.	4 years ago
sql	Fix postgres_fdw to check shippability of sort clauses properly.	4 years ago
.gitignore	Add postgres_fdw contrib module.	13 years ago
Makefile	Split all OBJS style lines in makefiles into one-line-per-entry style.	6 years ago
connection.c	postgres_fdw: Fix unexpected reporting of empty message.	4 years ago
deparse.c	Fix postgres_fdw to check shippability of sort clauses properly.	4 years ago
option.c	Avoid using ambiguous word "non-negative" in error messages.	4 years ago
postgres_fdw--1.0.sql	Add postgres_fdw contrib module.	13 years ago
postgres_fdw.c	Fix postgres_fdw to check shippability of sort clauses properly.	4 years ago
postgres_fdw.control	Add postgres_fdw contrib module.	13 years ago
postgres_fdw.h	Fix postgres_fdw to check shippability of sort clauses properly.	4 years ago
shippable.c	Update copyrights for 2020	6 years ago