LantaoJin commented on issue #25840: [SPARK-29166][SQL] Add parameters to limit the number of dynamic partitions for data source table URL: https://github.com/apache/spark/pull/25840#issuecomment-534395761 I found current implementation has a problem that `FileCommitProtocol` is SerDe within closure. So the member `totalPartitions` in `SQLHadoopMapReduceCommitProtocol` will be initialized per task. INSERT INTO ... SELECT ... DISTRIBUTE BY will fail in UT. I will refactor it. Now mark it as WIP.
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