fatmanverse commented on PR #12803:
URL: https://github.com/apache/seatunnel/pull/12803#issuecomment-6207001347

   Thanks @ryanmeowy and @DanielLeens for the reviews.
   
   - N1: added a note to the PR description. On a target whose unique index 
treats NULLs as equal (for example SQL Server), the extra NULL-key rows now 
fail with a unique-constraint error, where before they were silently dropped.
   - N2 / ClickHouse: same pattern, confirmed in 
`ReduceBufferedBatchStatementExecutor`. To keep this PR scoped to Jdbc, I 
opened #12821 as a follow-up.
   - CI: `unit-test (11, ubuntu-latest)` failed in 
`SavePointTest.testSavePointButJobGoingToFail` (`seatunnel-engine-server`), 
which this PR does not touch. I re-ran the failed jobs.


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