SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Function length (children 1)
     ExpressionList (children 1)
      Function arrayElementOrNull (children 1)
       ExpressionList (children 2)
        Identifier m2
        Function CAST (children 1)
         ExpressionList (children 2)
          Literal \'aaa\'
          Literal \'FixedString(4)\'
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier t_map_03240
