Github user yhuai commented on a diff in the pull request:

    https://github.com/apache/spark/pull/12153#discussion_r58613895
  
    --- Diff: 
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/FileSourceStrategy.scala
 ---
    @@ -137,10 +140,12 @@ private[sql] object FileSourceStrategy extends 
Strategy with Logging {
     
               val splitFiles = selectedPartitions.flatMap { partition =>
                 partition.files.flatMap { file =>
    +              val blockLocations = getBlockLocations(file)
                   (0L to file.getLen by maxSplitBytes).map { offset =>
                     val remaining = file.getLen - offset
                     val size = if (remaining > maxSplitBytes) maxSplitBytes 
else remaining
    -                PartitionedFile(partition.values, 
file.getPath.toUri.toString, offset, size)
    +                val hosts = getBlockHosts(blockLocations, offset)
    +                PartitionedFile(partition.values, 
file.getPath.toUri.toString, offset, size, hosts)
    --- End diff --
    
    How about we add document to this FileSourceStrategy to explain our 
strategy? So, readers can quickly understand what we are doing at here.


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