Re: pg_tablespace_location() error message

On Tue, Apr 10, 2012 at 5:43 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> Bruce Momjian <bruce(at)momjian(dot)us> writes:
>> The new pg_tablespace_location() function added in PG 9.2 to remove the
>> director location from pg_tablespace returns an odd error for '0', which
>> is InvalidOID:
>
> Well, it's the same "odd error" you'd get for any other bogus OID.
>
> The way the function is coded, it has no need to look into pg_tablespace
> as such, which is why you don't get something like "no such tablespace".
> We could add such a lookup purely for error detection purposes, but I'm
> not real sure I see the point.

I think what Bruce might be getting at is that 0 is more likely than a
randomly chosen value to be passed to this function; for example, one
can imagine wanting to pass pg_class.reltablespace.

--
Robert Haas
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