SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 3)
    Function toDateTime64 (alias dt64) (children 1)
     ExpressionList (children 2)
      Literal \'2023-04-21 10:20:30.123456789\'
      Literal UInt64_9
    Function toMillisecond (children 1)
     ExpressionList (children 1)
      Identifier dt64
    Function toMillisecond (children 1)
     ExpressionList (children 1)
      Function materialize (children 1)
       ExpressionList (children 1)
        Identifier dt64
