PostgreSQL doesn't have IFNULL in includes/Query.php

[ibrawley]

As per the comment in includes/Hooks.php, PostgreSQL doesn't use the IFNULL() function, it has a COALESCE() function.

In includes/Query.php at lines 1908 and 1915, the SELECT statement being constructed is using IFNULL() without testing what the database type is first.

Attached is a quick patch that does seem to do the trick, though extra checks, etc. may be required.

Thanks.

ivan.
Query.php.patch.txt