Re: counterintuitive behaviour in pl/pgsql

Dan S <strd911@gmail.com> writes:
> And yes I do know that I can fix the problem by renaming the output column
> to something else than i , I'm just curious about the behaviour and if it
> should work like this and why.

> CREATE OR REPLACE FUNCTION dynamic_query(i int) RETURNS TABLE (i int) as $$

This should probably throw an error.  There is a check that disallows
having two input or two output parameters named the same, but the
comment about it says:

            /*
             * As of Postgres 9.0 we disallow using the same name for two
             * input or two output function parameters.  Depending on the
             * function's language, conflicting input and output names might
             * be bad too, but we leave it to the PL to complain if so.
             */

It looks like plpgsql didn't get the memo about checking this.

            regards, tom lane