Dian Fu created FLINK-22125:
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Summary: Revisit the return value of MapState.get when the key
doesn't exists
Key: FLINK-22125
URL: https://issues.apache.org/jira/browse/FLINK-22125
Project: Flink
Issue Type: Sub-task
Components: API / Python
Affects Versions: 1.13.0
Reporter: Dian Fu
Fix For: 1.13.0
Currently, it will thrown KeyError if the key doesn't exist for MapState in
Python DataStream API. However, it returns null in the Java DataStream API.
Maybe we should keep the behavior the same across Python DataStream API and
Java DataStream API.
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