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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