[GitHub] spark pull request #16677: [SPARK-19355][SQL] Use map output statistices to ...

[wzhfy <gi...@git.apache.org>]

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

    https://github.com/apache/spark/pull/16677#discussion_r115642947
  
    --- Diff: core/src/main/scala/org/apache/spark/MapOutputStatistics.scala ---
    @@ -23,5 +23,9 @@ package org.apache.spark
      * @param shuffleId ID of the shuffle
      * @param bytesByPartitionId approximate number of output bytes for each map output partition
      *   (may be inexact due to use of compressed map statuses)
    + * @param numberOfOutput number of output for each pre-map output partition
    --- End diff --
    
    What does pre-map output partition mean? `numberOfOutput` is the same name in `MapStatus`, rename it `recordsByPartitionId`?


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