[jira] [Created] (KAFKA-10277) Relax non-null key requirement for stream-globalTable joins

["Matthias J. Sax (Jira)" <ji...@apache.org>]

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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