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Posted to issues@flink.apache.org by "chendan (Jira)" <ji...@apache.org> on 2022/01/04 08:37:00 UTC

[jira] [Created] (FLINK-25513) CoFlatMapFunction requires both two flat_maps to yield something

chendan created FLINK-25513:
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             Summary: CoFlatMapFunction requires both two flat_maps to yield something
                 Key: FLINK-25513
                 URL: https://issues.apache.org/jira/browse/FLINK-25513
             Project: Flink
          Issue Type: Bug
          Components: API / Python
    Affects Versions: 1.13.3
            Reporter: chendan


When I used CoFlatMapFunction is pyflink, I found out that I must put yield something in both flat_map1 and flat_map2. Otherwise, it will raise an exception: TypeError: 'NoneType' object is not iterable.

In pyflink source code: datastream.py,  the process_element2 of KeyedCoMapCoProcessFunction class in ConnectedStreams class has only one sentence: 

{color:#cc7832}yield {color}{color:#94558d}self{color}._underlying.map2(value). if the flat_map2 has not yield something it will result in exception. So it should judge whether the {color:#94558d}self{color}._underlying.map2(value) is None or not firstly.



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