well. i had some free time to search it.  from here:
http://www.postgresql.org/docs/9.3/static/sql-select.html#SQL-UNION you'll
see the default is indeed UNION DISTINCT.  so changing it to UNION ALL
you'll get different results - are they the ones you're expecting?
On Wed, Mar 12, 2014 at 9:36 AM, Stephen Sprague <[EMAIL PROTECTED]> wrote:
 
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