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Tom Lane 76f965ff1f Improve handling of collations in contrib/postgres_fdw. ... If we have a local Var of say varchar type with default collation, and we apply a RelabelType to convert that to text with default collation, we don't want to consider that as creating an FDW_COLLATE_UNSAFE situation. It should be okay to compare that to a remote Var, so long as the remote Var determines the comparison collation. (When we actually ship such an expression to the remote side, the local Var would become a Param with default collation, meaning the remote Var would in fact control the comparison collation, because non-default implicit collation overrides default implicit collation in parse_collate.c.) To fix, be more precise about what FDW_COLLATE_NONE means: it applies either to a noncollatable data type or to a collatable type with default collation, if that collation can't be traced to a remote Var. (When it can, FDW_COLLATE_SAFE is appropriate.) We were essentially using that interpretation already at the Var/Const/Param level, but we weren't bubbling it up properly. An alternative fix would be to introduce a separate FDW_COLLATE_DEFAULT value to describe the second situation, but that would add more code without changing the actual behavior, so it didn't seem worthwhile. Also, since we're clarifying the rule to be that we care about whether operator/function input collations match, there seems no need to fail immediately upon seeing a Const/Param/non-foreign-Var with nondefault collation. We only have to reject if it appears in a collation-sensitive context (for example, "var IS NOT NULL" is perfectly safe from a collation standpoint, whatever collation the var has). So just set the state to UNSAFE rather than failing immediately. Per report from Jeevan Chalke. This essentially corrects some sloppy thinking in commit ed3ddf918b, so back-patch to 9.3 where that logic appeared.		10 years ago
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expected	Improve handling of collations in contrib/postgres_fdw.	10 years ago
sql	Improve handling of collations in contrib/postgres_fdw.	10 years ago
.gitignore	Add postgres_fdw contrib module.	13 years ago
Makefile	Fix SHLIB_PREREQS use in contrib, allowing PGXS builds	11 years ago
connection.c	Create an infrastructure for parallel computation in PostgreSQL.	11 years ago
deparse.c	Improve handling of collations in contrib/postgres_fdw.	10 years ago
option.c	Update copyright for 2015	11 years ago
postgres_fdw--1.0.sql	Add postgres_fdw contrib module.	13 years ago
postgres_fdw.c	Use appendStringInfoString/Char et al where appropriate.	10 years ago
postgres_fdw.control	Add postgres_fdw contrib module.	13 years ago
postgres_fdw.h	Add support for INSERT ... ON CONFLICT DO NOTHING/UPDATE.	11 years ago