Martijn Visser created FLINK-40742:
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             Summary: Pin the JDBC Table sink's changelog behaviour with tests 
before the Sink V2 migration
                 Key: FLINK-40742
                 URL: https://issues.apache.org/jira/browse/FLINK-40742
             Project: Flink
          Issue Type: Technical Debt
          Components: Connectors / JDBC
    Affects Versions: jdbc-5.0.0
            Reporter: Martijn Visser
            Assignee: Martijn Visser


`JdbcDynamicTableSink`'s changelog path is covered by two end-state assertions 
(`testUpsert`, `testReadingFromChangelogSource`); no test references 
`TableBufferReducedStatementExecutor`, `TableInsertOrUpdateStatementExecutor`, 
`TableBufferedStatementExecutor` or `TableSimpleStatementExecutor`. FLINK-37987 
will replace the legacy `SinkFunction` path with a Sink V2 writer; FLINK-26638 
(Elasticsearch, reverted in 1.15 because a legacy behaviour was not carried 
over) is the reason to pin the behaviour first: reduce by key, 
upsert-before-delete order, retry replay, object-reuse copy, the fallback 
branch on dialects without a native upsert, and `sink.parallelism` above the 
input parallelism. The executor fakes extend `DerbyDialect` and move with 
FLINK-40730.



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