CodeWithPravinMaske commented on PR #12597:
URL: https://github.com/apache/seatunnel/pull/12597#issuecomment-5969591651

   Thanks a lot for the detailed review, @DanielLeens!
   
   - **Issue 1:** added unit tests for the default 
`JdbcDataSourceDialect#isColumnNullable` with a mocked `DatabaseMetaData`: 
`IS_NULLABLE=YES` / `NO`, the fallback to `Column#isOptional()` when no row 
matches, and a row matched only by the LIKE pattern (`noXpk` for `no_pk`) that 
must be ignored. With the exact-name check removed, the pattern test fails.
   - **Issue 3:** the WARN messages now say how to restore parallel snapshot 
reading (declare a NOT NULL unique column or configure a non-nullable 
`snapshotSplitColumn`).
   - **Issue 2:** agreed, I kept the schema-based check in this PR since a 
data-dependent probe or an `IS NULL` chunk has snapshot/binlog consistency 
implications. Happy to look at an `IS NULL` chunk as a follow-up.
   
   This commit also triggers a fresh CI run, since the previous attempt was 
cancelled at the website job.


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