#NEWLINE# def test_column_subquery_exists( self ) : #NEWLINE# #INDENT# t = self . _fixture ( ) #NEWLINE# s = exists ( ) . where ( ( t . c . x == 5 ) ) . select ( ) #NEWLINE# mapping = self . _mapping ( s ) #NEWLINE# assert ( t . c . x not in mapping ) #NEWLINE# eq_ ( [ type ( entry [ ( - 1 ) ] ) for entry in s . compile ( ) . _result_columns ] , [ Boolean ] )