On Wed, Oct 6, 2010 at 2:48 AM, Trigve <trigves@gmail.com> wrote:
> Hi,
> I'm trying to make a custom composite type and use it as a PK and FK.
> When adding FK to table I've got trhis error: operator is not unique:
> "BigintRef" pg_catalog.= "BigintRef" (see below). Here is my type
> definition with operator:
>
> CREATE TYPE "BigintRef" AS
> ("Value" bigint,
> "Null" boolean);
>
> CREATE OR REPLACE FUNCTION bigintref_op_eq("BigintRef", "BigintRef")
> RETURNS boolean AS
> 'SELECT ($1."Null" = TRUE AND $2."Null" = TRUE) OR ($1."Null" = FALSe
> AND $2."Null" = FALSE AND $1."Value" = $2."Value")'
> LANGUAGE sql IMMUTABLE
> COST 100;
you shouldn't have to do this -- as of 8.4 record types can be
directly used in comparisons w/o going custom operator route and I
would highly advise against redefining the = operator to use
non-standard behavior.
postgres=# create table foo(a int, b bool);
CREATE TABLE
Time: 11.433 ms
postgres=# select (1, true)::foo = (2,false)::foo;
?column?
----------
f
(1 row)
Time: 1.424 ms
merlin