tragicjun opened a new pull request #6495: [FLINK-10061] [kafka] Fix unsupported configuration in KafkaTableSink URL: https://github.com/apache/flink/pull/6495 ## What is the purpose of the change When using KafkaTableSink in "Table.writeToSink(), the following exception is thrown: `java.lang.UnsupportedOperationException: Reconfiguration of this sink is not supported.` In `Table.writeToSink()` an invocation to "TableSink.configure()" is made to configure parsed fieldNames and fieldTypes from table query. However, `KafkaTableSink.configure()` doesn't support reconfiguration once a fixed table schema has already been configured. This pull request tries to fix the issue: a quick fix is to change the semantics of "KafkaTableSink.configure()". ## Brief change log - Allow reconfiguration to KafkaTableSink even when a fixed table schema exists. The semantics of this configuration therefore is to verify if configured fieldTypes matches with the fieldTypes declared by the fixed table schema. A `ValidationException` would be thrown if they do not match. ## Verifying this change This change is a trivial fix without any test coverage. ## Does this pull request potentially affect one of the following parts: - Dependencies (does it add or upgrade a dependency): (no) - The public API, i.e., is any changed class annotated with `@Public(Evolving)`: (no) - The serializers: (no) - The runtime per-record code paths (performance sensitive): (no) - Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Yarn/Mesos, ZooKeeper: (no) - The S3 file system connector: (no) ## Documentation - Does this pull request introduce a new feature? (no) - If yes, how is the feature documented? (not applicable)
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