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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