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https://issues.apache.org/jira/browse/FLINK-3614?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15197171#comment-15197171
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Aljoscha Krettek commented on FLINK-3614:
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Yes, the parallel pre-aggregation will have to get its own issue, however. :-)
> Remove Non-Keyed Window Operator
> --------------------------------
>
> Key: FLINK-3614
> URL: https://issues.apache.org/jira/browse/FLINK-3614
> Project: Flink
> Issue Type: Improvement
> Components: Streaming
> Reporter: Aljoscha Krettek
> Assignee: Aljoscha Krettek
>
> I propose to remove the special Non-Keyed Window Operator and implement
> non-parallel windows by using the standard WindowOperator with a dummy
> KeySelector.
> Maintaining everything for two WindowOperators is a huge burden. The
> implementation is completely separate by now. For example, the Non-Keyed
> window operator does not use the StateBackend for state, i.e. cannot use
> RocksDB. Also, with upcoming changes (Merging/Session windows, aligned
> windows) this will only increase the maintenance burden.
> Also, the fast AlignedProcessingTimeWindows operators also only support the
> Parallel/Keyed case.
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