SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Function abs (alias check) (children 1)
     ExpressionList (children 1)
      Function negate (children 1)
       ExpressionList (children 1)
        Function sign (children 1)
         ExpressionList (children 1)
          Identifier right_0.c1
   TablesInSelectQuery (children 2)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier t0 (alias left)
    TablesInSelectQueryElement (children 2)
     TableExpression (children 1)
      TableIdentifier t0 (alias right_0)
     TableJoin (children 1)
      Function equals (children 1)
       ExpressionList (children 2)
        Identifier left.c0
        Identifier right_0.c1
