KAFKA-19669: Merge repartition topics when value-changing operations are present #20807
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Prior to KAFKA-19669, merge repartition topics optimization stops at value-changing operations (mapValues, flatMapValues, etc.) As a result, topology builder cannot merge repartition topics that are separated by value-changing operations, which results in inefficiency due to multiple repartition topics.
This patch introduces tracking value serdes at each node. This allows pushing repartition upstream past value-changing operations by switching to upstream serdes when resolving. As a result, it enables merging repartitions across value-changing boundaries. This merging will improve the overall processing efficiency.