Github user rtudoran commented on the issue:
https://github.com/apache/flink/pull/4263
@fhueske You were the one that argue that retraction support is needed for
offset and fetch. When we were discussing this i was not into having the
retraction. I think finally it depends on what behavior we want to give for the
function. If we have a SELECT x FROM stream ORDER BY *time FETCH 2 when we emit
the new latest data - do we still want to invalidate what we have emitted
previously (in this case we would emit the retraction), otherwise if we
consider that that was the valid input at that point in time - we do not need
the retraction. I am fine either way. Let me know.
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