SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function toString (children 1)
     ExpressionList (children 1)
      Function CAST (children 1)
       ExpressionList (children 2)
        Function toTime64 (children 1)
         ExpressionList (children 2)
          Literal \'01:02:03.123000\'
          Literal UInt64_6
        Literal \'Time64(3)\'
