Github user inouehrs commented on a diff in the pull request:
https://github.com/apache/spark/pull/13459#discussion_r73395438
--- Diff:
sql/core/src/test/scala/org/apache/spark/sql/DatasetBenchmark.scala ---
@@ -43,7 +43,7 @@ object DatasetBenchmark {
var res = rdd
var i = 0
while (i < numChains) {
- res = rdd.map(func)
--- End diff --
Here, obviously, this should be `res = res.map(func) `.
The original code applies map only once to the input `rdd` regardless of
`numChains`.
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