I had the same success using 7.3.2 with Cygwin:
e=# SELECT functest1('A','B'), functest1(null,'B'), functest2('A','B'),
functest2(null,'B');
functest1 | functest1 | functest2 | functest2
-----------+-----------+-----------+-----------
A | B | A | B
(1 row)
e=# select version();
version
----------------------------------------------------------------------------
----------
PostgreSQL 7.3.2 on i686-pc-cygwin, compiled by GCC gcc (GCC) 3.2 20020927
(prerelease)
(1 row)
George
- snip -
> Not sure whether this is because of the change 7.3.1->7.3.2 or cygwin vs
> linux. Don't have a copy of 7.3.1 to check against, sorry. Perhaps check
the
> changes list to see if it mentions something like this.
>
> --
> Richard Huxton
> Archonet Ltd
>
> ---------------------------(end of broadcast)---------------------------
> TIP 9: the planner will ignore your desire to choose an index scan if your
> joining column's datatypes do not match
>
