Github user fhueske commented on the pull request:
https://github.com/apache/flink/pull/1098#issuecomment-139494655
The semantics of `NO_OVERWRITE` are correct and pretty clear, IMO.
If we would change `NO_OVERWRITE` to even fail if there is no file, it's
semantics would change to `NO_WRITE` and always fail.
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