SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 2)
    Function CAST (alias x) (children 1)
     ExpressionList (children 2)
      Function toNullable (children 1)
       ExpressionList (children 1)
        Function toInt32 (children 1)
         ExpressionList (children 1)
          Literal UInt64_1
      Literal \'Int32\'
    Function toTypeName (children 1)
     ExpressionList (children 1)
      Identifier x