SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Function toDateTime64 (alias dt64) (children 1)
     ExpressionList (children 3)
      Literal \'2019-09-16 19:20:11.123\'
      Literal UInt64_3
      Literal \'UTC\'
   ExpressionList (children 2)
    Function toStartOfSecond (alias res) (children 1)
     ExpressionList (children 1)
      Function materialize (children 1)
       ExpressionList (children 1)
        Identifier dt64
    Function toTypeName (children 1)
     ExpressionList (children 1)
      Identifier res