[FLINK-39037] support query kafka cluster id as metadata in records of DynamicKafkaTableSource #222
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Motivation
Kafka cluster id is an essential constant to query in context of multi clusters of dynamic kafka source. ConsumerRecord includes topic/partition/offset but not Kafka cluster id. This PR adds an opt-in side-channel to inject cluster id into deserialization so SQL metadata can expose kafka_cluster correctly in dynamic multi-cluster reads.
What Changed