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Posted to issues@flink.apache.org by "Dian Fu (Jira)" <ji...@apache.org> on 2022/01/05 05:55:00 UTC
[jira] [Commented] (FLINK-25513) CoFlatMapFunction requires both two flat_maps to yield something
[ https://issues.apache.org/jira/browse/FLINK-25513?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17469027#comment-17469027 ]
Dian Fu commented on FLINK-25513:
---------------------------------
[~atptour2017] Thanks for reporting this issue. Would you like to take it?
> 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
> Priority: Major
>
> 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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