Github user zentol commented on the issue:
https://github.com/apache/flink/pull/3812
There is no doubt that you **can** modify the commits of an open PR. My
point is that you **shouldn't** because it messes with the review.
This applies to both squashing commits and force pushing in general. The
only exception is when you rebase the PR; but that should only be done if a
rebase actually causes conflicts.
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