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Posted to jira@kafka.apache.org by "Matthias J. Sax (Jira)" <ji...@apache.org> on 2023/02/23 19:25:00 UTC

[jira] [Created] (KAFKA-14748) Relax non-null FK left-join requirement

Matthias J. Sax created KAFKA-14748:
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             Summary: Relax non-null FK left-join requirement
                 Key: KAFKA-14748
                 URL: https://issues.apache.org/jira/browse/KAFKA-14748
             Project: Kafka
          Issue Type: Improvement
          Components: streams
            Reporter: Matthias J. Sax


Kafka Streams enforces a strict non-null-key policy in the DSL across all key-dependent operations (like aggregations and joins).

This also applies to FK-joins, in particular to the ForeignKeyExtractor. If it returns `null`, it's treated as invalid. For left-joins, it might make sense to still accept a `null`, and add the left-hand record with an empty right-hand-side to the result.



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