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2a77850707
'duplicate' columns from the resulting column clause that are known to be equivalent based on the join condition. this is of great usage when constructing subqueries of joins which Postgres complains about if duplicate column names are present. - added support to polymorphic stuff for more than one "equivalent column", when trying to target columns in the polymorphic union; this applies to multi-leveled inheritance - put above-two concepts together to get the abc_inheritance tests to work with postgres