On Aug 20, 2013, at 6:50 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> You need more parentheses -- (source::text) would've worked.
Alas, no, same problem as for CAST():
ERROR: functions in index expression must be marked IMMUTABLE
>> No problem, I can use CAST(), right? So I try:
>> EXCLUDE USING gist (CAST(source AS text) WITH =, within WITH &&)
>> Not so much:
>> try.sql:13: ERROR: functions in index expression must be marked IMMUTABLE
>> I guess it's because locale settings might change, and therefore change the text representation? Seems unlikely,
though.
>
> Not locale, just renaming one of the values would be enough to break that.
> Admittedly we don't provide an official way to do that ATM, but you can do
> an UPDATE on pg_enum.
Ah, right. Maybe if there was a way to get at some immutable numeric value…
Thanks,
David
