SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 3)
    Function isNull (children 1)
     ExpressionList (children 1)
      Identifier id
    Function isNull (children 1)
     ExpressionList (children 1)
      Identifier n
    Function isNotNull (children 1)
     ExpressionList (children 1)
      Identifier n
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier t_func_to_subcolumns
   ExpressionList (children 1)
    OrderByElement (children 1)
     Identifier id
