JingsongLi opened a new pull request #8867: [FLINK-12956][jdbc] Introduce upsert table sink for JDBC URL: https://github.com/apache/flink/pull/8867 ## What is the purpose of the change Now we just support append JDBC sink, this is very limited. Consider a simple wordCount, we need insert/update the sink with primary keys. So we need to support upsert JDBC sink. 1.Introduce a AbstractJdbcOutputFormat to extract some common method from JDBCOutputFormat. Introduce a UpsertJDBCOutputFormat which extends AbstractJdbcOutputFormat. 2.Introduce UpsertJdbcTableSink. ## Verifying this change UT and Manual test ## 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? yes - If yes, how is the feature documented? JavaDocs
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