SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Function toDateTime64 (alias dt64) (children 1)
     ExpressionList (children 2)
      Literal \'2019-09-16 19:20:12.3456789102019-09-16 19:20:12.345678910\'
      Literal UInt64_0
   ExpressionList (children 1)
    Identifier dt64