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https://issues.apache.org/jira/browse/FLINK-25513?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dian Fu reassigned FLINK-25513:
-------------------------------
Assignee: chendan
> 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: 1.13.0
> Reporter: chendan
> Assignee: chendan
> Priority: Major
> Labels: pull-request-available
>
> When I used CoFlatMapFunction in 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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