Is an append with a last-update-time configuration same as update? If a file has changed but has the same name will it be replaced? Will there be a duplicate?
If the transaction type is set to APPEND and the ingest job tries to add a file that already exists, the job will fail, because multiple files with identical paths in a dataset view are not allowed.
You can use the Append timestamp to filenames transformer if you want to exclusively append files to the dataset while still capturing the latest version of each file from the source filesystem.
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