Don Y <pgsql(at)DakotaCom(dot)Net> writes:
> I'm writing a set of casts to/from various user defined
> types. As is unexpected, there are cases where one
> data type doesn't neatly map to another (for certain
> values). In these cases I emit an INVALID_PARAMETER_VALUE
> or OUT_OF_RANGE error -- depending on the situation.
> But, should I also PG_RETURN_NULL()?
elog(ERROR) doesn't return to your function --- think of it as being
like exit(). So it's pointless to code anything after it.
regards, tom lane