Matthias J. Sax created KAFKA-10277:
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Summary: Relax non-null key requirement for stream-globalTable
joins
Key: KAFKA-10277
URL: https://issues.apache.org/jira/browse/KAFKA-10277
Project: Kafka
Issue Type: Improvement
Components: streams
Reporter: Matthias J. Sax
In general, Kafka Streams requires that key and value are non-null for
aggregations and join input records. While this requirement is reasonable in
general, for stream-globalKTable joins it's questionable for the stream input
record key. The join is based on a `keySelector` and it seems to be sufficient
to require that the `keySelector` returns a not-null join-key for the stream
record.
We should consider to relax the non-null key requirement for stream-side input
records.
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