[jira] [Created] (KAFKA-7714) Scala streams API should use Options in left and outer joins

["Charles Crain (JIRA)" <ji...@apache.org>]

Charles Crain created KAFKA-7714:
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             Summary: Scala streams API should use Options in left and outer joins
                 Key: KAFKA-7714
                 URL: https://issues.apache.org/jira/browse/KAFKA-7714
             Project: Kafka
          Issue Type: Improvement
          Components: streams
    Affects Versions: 2.1.0, 2.0.1
            Reporter: Charles Crain


The Scala streams DSL for left and outer joins should use Options instead of possibly-null parameters to the joiner functions. As currently written, implementers of joiners for Kafka Streams must account for the right side of a left join (or either side of an outer join) being null, which is not idiomatic Scala.

Note to reviewer: I would like to contribute this change myself. What is the policy on breaking API changes? Would it be acceptable to change the left/outer join APIs to accept options? Or would I need to implement parallel versions (naming suggestions if so?).



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