This KStream.transform() variant restores the old capability of using scala-style Transformers that return (key, value) tuple instead of returning KeyValue instances.
This capability was present in the old Lightbend's kafka-streams-scala package and it seems that 2.0.0 API intended to have this capability, but it didn't work because of KAKFA-7250 *More detailed description of your change, if necessary. The PR title and PR message become the squashed commit message, so use a separate comment to ping reviewers.* *Summary of testing strategy (including rationale) for the feature or bug fix. Unit and/or integration tests are expected for any behaviour change and system tests should be considered for larger changes.* ### Committer Checklist (excluded from commit message) - [ ] Verify design and implementation - [ ] Verify test coverage and CI build status - [ ] Verify documentation (including upgrade notes) [ Full content available at: https://github.com/apache/kafka/pull/5619 ] This message was relayed via gitbox.apache.org for [email protected]
