Stephan Ewen created FLINK-16555:
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Summary: Preflight check for known unstable hashCodes.
Key: FLINK-16555
URL: https://issues.apache.org/jira/browse/FLINK-16555
Project: Flink
Issue Type: Improvement
Components: API / DataStream
Reporter: Stephan Ewen
Fix For: 1.11.0
Data types can only be used as keys, if they have a stable hash code
implementation that is deterministic across JVMs. Otherwise, the keyBy()
operations will result in incorrect data routing.
We should eagerly check the key type information for known cases types with
unstable hash code, such as
* arrays
* enums
* anything that does not override Object.hashCode
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