aljoscha commented on issue #10153: [FLINK-14709] Allow outputting elements in user defined close method,… URL: https://github.com/apache/flink/pull/10153#issuecomment-557146373 This makes me wonder why the reduce/combine driver emit the final batch in `close()` and not `closeTask()`. I think it's a good change, though. Logically it makes sense that we emit any last data in `closeTask()` and that `close()` is only for resource cleanup/dispose.
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