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Document the state by adding a label to the FLIP page with one of "discussion", "accepted", "released", "rejected".

Discussion threadhere (<- link to https://lists.apache.org/list.html?dev@flink.apache.org)/thread/0jdvry7wl9fk15qcpo56tj1s9lzyv551
Vote threadhere (<- link to https://lists.apache.org/list.html?dev@flink.apache.org)
JIRAhere (<- link to https://issues.apache.org/jira/browse/FLINK-XXXX)
Release<Flink Version>


Please keep the discussion on the mailing list rather than commenting on the wiki (wiki discussions get unwieldy fast).


Please note that this JIRA has been abandoned.

Motivation

Although the current Flink SQL Window Aggregation documentation[1] indicates that the legacy Group Window Aggregation syntax has been deprecated, the new Window TVF Aggregation syntax has not fully covered all of the features of the legacy one. Whether to support CDC streaming is an obvious example. The operator generated by the new Window TVF Aggregation syntax only supports consuming append-only streams, while the operator generated by the legacy Group Window Aggregation syntax can support consuming CDC streams.

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