gengliangwang opened a new pull request #24571: [SPARK-27668][SQL] File source 
V2: support reporting statistics
URL: https://github.com/apache/spark/pull/24571
 
 
   ## What changes were proposed in this pull request?
   
   In File source V1, the statistics of `HadoopFsRelation` is 
`compressionFactor * sizeInBytesOfAllFiles`.
   To follow it, we can implement the interface SupportsReportStatistics in 
FileScan and report the same statistics.
   
   ## How was this patch tested?
   
   Unit test
   

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