me again... I figured it out...
The Error was caused because I used UNION in place of UNION ALL. I still don't understand why the ARRAY (path) could not be grouped... Bye rawi -- View this message in context: http://www.nabble.com/WITH-RECURSIVE%3A-ARRAY-id--All-column-datatypes-must-be-hashable-tp25167538p25168751.html Sent from the PostgreSQL - sql mailing list archive at Nabble.com. -- Sent via pgsql-sql mailing list (pgsql-sql@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-sql