BOOLEAN question

Folks,

Odd question:  I have a query that returns a set of none to several rows. One
column in these rows is BOOLEAN.   I want the query to return:
1) TRUE if *any* of the BOOLEAN values is TRUE;
2) FALSE if *all* of the BOOLEAN values are FALSE;
3) FALSE or NULL if no rows are returned.

I thought that I could do this through a MAX(boolean), but as it turns out,
MAX(boolean) has not been defined in the standard 7.2.3. distro.  I could
define MAX(boolean), but I'm wondering if I'm missing something obvious.

--
-Josh BerkusAglio Database SolutionsSan Francisco