Github user chenqin commented on the issue:
https://github.com/apache/flink/pull/2982
@aljoscha,
diff has been updated and merged to support `apply(Function,
lateElementsOutput);`
`Collector` refactor seems not viable option as stated above.
Seems travis-ci timeouted here, is there a way to increase timeout setting?
https://travis-ci.org/chenqin/flink/builds/201329246
Chen
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