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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