Github user wangyum commented on the issue: https://github.com/apache/spark/pull/23014 Yes. The `filePartitions` are the same as the bucket number when `BucketedRead`: https://github.com/apache/spark/blob/ab5752cb952e6536a68a988289e57100fdbba142/sql/core/src/main/scala/org/apache/spark/sql/execution/DataSourceScanExec.scala#L382-L414
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