[PATCH] collation for (expr)

От:

Peter Eisentraut <peter_e@gmx.net>

Дата:

8 января 2012 г. в 18:17:26

Here is a patch for the following construct, specified in the SQL
standard:

    collation for (expr)

returns the collation of the argument.  It's similar to pg_typeof.

The SQL standard is not clear on the exact format of the return value.
I went with what ruleutils.c produces, which is useful for human
inspection and also for plugging back into SQL statements.