[GitHub] spark issue #13459: [SPARK-15726] [SQL] Make DatasetBenchmark fairer among D...

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

Github user inouehrs commented on the issue:

    https://github.com/apache/spark/pull/13459
  
    I found another bug that significantly affects the performance comparisons.
    In _back-to-back map_ and _back-to-back filter_, map or filter operation is executed only once regardless of `numChains` for RDD. Hence the execution times for RDD have been largely underestimated.
    
    Regarding the `toRdd` issue pointed out by @rxin, `toRdd` returns RDD of `InternalRow` (not RDD of `Data`) and hence I think it does not cause significant overhead of a conversion.



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