"David E. Wheeler" <david(at)kineticode(dot)com> writes:
> Datum citext_ne (PG_FUNCTION_ARGS) {
> // Fast path for different-length inputs. Okay for canonical
> equivalence?
> if (VARSIZE(PG_GETARG_TEXT_P(0)) != VARSIZE(PG_GETARG_TEXT_P(1)))
> PG_RETURN_BOOL( 1 );
> PG_RETURN_BOOL( citextcmp( PG_ARGS ) != 0 );
> }
BTW, I don't think you can use that same-length optimization for
citext. There's no reason to think that upper/lowercase pairs will
have the same length all the time in multibyte encodings.
regards, tom lane