Core: add FanoutEqualityDeleteWriter and FanoutPositionDeleteWriter

[dungdm93]

Inspire from ClusteredPositionDeleteWriter and ClusteredEqualityDeleteWriter, this PR add 2 FanoutWriter that write delete files which could be used in streaming (e.g Flink)

Signed-off-by: Đặng Minh Dũng [email protected]

[dungdm93]

cc @aokolnychyi

[rdblue]

@dungdm93, are these needed? You said they "could be used" but we don't want to add classes unless they are actually going to be used by some engine.

[pvary]

@rdblue: Not sure about the FanoutEqualityDeleteWriter, but we are thinking about implementing deletes for low cardinality tables. FanoutPositionDeleteWriter might be useful there. Would that make sense there? That said we are only in the "scratching the surface" phase, so we might go into another direction when we start seriously working on it.

[dungdm93]

@rdblue @pvary actually, it's a part of #4132, let's go there for the discussion.

[github-actions]

This pull request has been marked as stale due to 30 days of inactivity. It will be closed in 1 week if no further activity occurs. If you think that’s incorrect or this pull request requires a review, please simply write any comment. If closed, you can revive the PR at any time and @mention a reviewer or discuss it on the [email protected] list. Thank you for your contributions.

[github-actions]

This pull request has been closed due to lack of activity. This is not a judgement on the merit of the PR in any way. It is just a way of keeping the PR queue manageable. If you think that is incorrect, or the pull request requires review, you can revive the PR at any time.