sunchao opened a new pull request #29471:
URL: https://github.com/apache/spark/pull/29471


   A continuation of #29179. Bulk of the changes from this is moving the 
parallel listing feature from `InMemoryFileIndex` to a utility class 
`HadoopFSUtils`, which unlocks it to be used by other access paths such as 
old-style HadoopRDD. 
   
   TODO:
   - identify other file formats which do explicit listing and can benefit from 
the parallelism


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