[Pljava-dev] testing for equality in user-defined types in select statements

On 12/26/2011 7:41 PM, Bear Giles wrote:
> I have a UDT for rational numbers. I want to be able to add it in
> select statements but it doesn't work.
> >
> select f.value, f.foo, b.bar from foo f join bar b on (f.value =
> b.value);
>
> I vaguely recall that there were standard function names for this when I
> played with C UDT years ago but that was PSQL version 5.x or 6.x. Is
> that still the case? In either case the wiki should be updated.
>

You are looking for CREATE OPERATOR for equality/comparison and CREATE
OPERATOR CLASS for ordering definition. These are no different for
pljava types vs any other implemented type.

Kris Jurka