chendan created FLINK-25513: ------------------------------- 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. -- This message was sent by Atlassian Jira (v8.20.1#820001)