Yaohua628 commented on pull request #35676:
URL: https://github.com/apache/spark/pull/35676#issuecomment-1057840425
After manual testing locally, changes of `_metadata` in streaming won't
cause any backward-compatible issues for `dropDuplicates()`:
1. with **Spark 3.2**:
`readStream...select("*").dropDuplicates().writeStream...option("checkpointLocation",
".../checkpoint")`
2. verify results (duplicated data did get dropped), verify checkpoint dir
(commits, offsets, sources, state)
3. add some new files including duplicates
4. with **Spark master (3.3 with _metadata feature)** with the **_same_**
checkpoint location:
`readStream...select("*").dropDuplicates().writeStream...option("checkpointLocation",
".../checkpoint")`
5. verify results (duplicated data did get dropped), verify checkpoint dir
(commits, offsets, sources, state)
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