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The existing join/leftJoin stream-globalTable overloads taking ValueJoinerWithKey are deprecated. Existing applications continue to compile and run unchanged, but the compiler will emit deprecation warnings, and the methods will be removed in a future major release.
The new joinOnForeignKey joinOnMappedKey and leftJoinOnForeignKey leftJoinOnMappedKey methods are additive. Existing code compiles and runs unchanged; migration is required only before the deprecated overloads are removed.
Stream-globalTable overloads taking ValueJoiner (no key access) are unaffected.
Migration guidance for the new join methods will be added to the Streams upgrade guide.
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