SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Function tuple (children 1)
     ExpressionList (children 2)
      Function tupleElement (children 1)
       ExpressionList (children 2)
        Identifier t1
        Literal \'a\'
      Function tupleElement (children 1)
       ExpressionList (children 2)
        Identifier t1
        Literal \'b\'
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier t_tuple_elem
   ExpressionList (children 1)
    OrderByElement (children 1)
     Identifier ALL
