KIP-855 — Add schema.namespace parameter to SetSchemaMetadata SMT in Kafka Connect

Discussion Connect

Adds schema.namespace as a distinct parameter to the SetSchemaMetadata SMT, allowing the Avro schema namespace to be set independently from the schema name. Previously the only way to set a namespace was to embed it in schema.name as a fully qualified name, preventing users from reusing the original table/topic name while only changing the namespace.

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