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Proposed Changes

This KIP proposes a new DSL entry point points that passes pass the join key (the result of the KeyValueMapper) to ValueJoinerWithKey, restoring the spirit of , and deprecates the original overloads that pass the stream record's key, so that readOnlyKey aligns with the join key as described in KIP-149 for stream-globalTable joins.

When a record arrives on the stream:

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Would require introducing a new ValueJoinerWithKeys interface accepting both keys. Rejected for this KIP, whose scope is limited to honoring KIP-149's existing readOnlyKey contract. It can be revisited as a separate KIP if demand emerges