Elias Levy created KAFKA-4217:
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Summary: KStream.transform equivalent of flatMap
Key: KAFKA-4217
URL: https://issues.apache.org/jira/browse/KAFKA-4217
Project: Kafka
Issue Type: Improvement
Components: streams
Affects Versions: 0.10.0.1
Reporter: Elias Levy
Assignee: Guozhang Wang
{{KStream.transform}} gives you access to state stores while allowing you to
return zero or one transformed {{KeyValue}}s. Alas, it is unclear what method
you should use if you want to access state stores and return zero or multiple
{{KeyValue}}s. Presumably you can use {{transform}}, always return {{null}},
and use {{ProcessorContext.forward}} to emit {{KeyValues}}s.
It may be good to introduce a {{transform}}-like {{flatMap}} equivalent, or
allow store access from other {{KStream}} methods, such as {{flatMap}} itself.
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