Hi folks, I opened a Jira Issue: https://issues.apache.org/jira/browse/FLINK-3614
This is the text of the issue: 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. Would anyone be opposed to me removing the non-keyed window operator? Cheers, Aljoscha
