@VZLA I just come up with a different thought. If every time we do a operation on existing data like update, delete or optimize, new parquet files will be created and the file creation date would be the latest time. Even we may have different write operation, we should always have a later creation time, right? That doesn't mean we postpone the data archiving rather than do it sooner than expect? 

Sorry for so many questions. Thanks in advance.