{"action":"created","comment":{"url":"https://api.github.com/repos/apache/spark/pulls/comments/93814766","pull_request_review_id":14351367,"id":93814766,"diff_hunk":"@@ -170,36 +176,39 @@ object DatasetBenchmark {\n     val benchmark3 = aggregate(spark, numRows)\n \n     /*\n-    OpenJDK 64-Bit Server VM 1.8.0_91-b14 on Linux 3.10.0-327.18.2.el7.x86_64\n-    Intel Xeon E3-12xx v2 (Ivy Bridge)\n+    Java HotSpot(TM) 64-Bit Server VM 1.8.0_60-b27 on Mac OS X 10.12.1\n+    Intel(R) Core(TM) i7-4960HQ CPU @ 2.60GHz\n+\n     back-to-back map:                        Best/Avg Time(ms)    Rate(M/s)   Per Row(ns)   Relative\n     ------------------------------------------------------------------------------------------------\n-    RDD                                           3448 / 3646         29.0          34.5       1.0X\n-    DataFrame                                     2647 / 3116         37.8          26.5       1.3X\n-    Dataset                                       4781 / 5155         20.9          47.8       0.7X\n+    RDD                                           3963 / 3976         25.2          39.6       1.0X\n+    DataFrame                                      826 /  834        121.1           8.3       4.8X\n+    Dataset                                       5178 / 5198         19.3          51.8       0.8X","path":"sql/core/src/test/scala/org/apache/spark/sql/DatasetBenchmark.scala","position":124,"original_position":124,"commit_id":"ff89719aec3785cb27315810791f14787d5ade26","original_commit_id":"43da0af12b40e1425e95fc944723b2a6539dbabc","user":{"login":"kiszk","id":1315079,"avatar_url":"https://avatars.githubusercontent.com/u/1315079?v=3","gravatar_id":"","url":"https://api.github.com/users/kiszk","html_url":"https://github.com/kiszk","followers_url":"https://api.github.com/users/kiszk/followers","following_url":"https://api.github.com/users/kiszk/following{/other_user}","gists_url":"https://api.github.com/users/kiszk/gists{/gist_id}","starred_url":"https://api.github.com/users/kiszk/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/kiszk/subscriptions","organizations_url":"https://api.github.com/users/kiszk/orgs","repos_url":"https://api.github.com/users/kiszk/repos","events_url":"https://api.github.com/users/kiszk/events{/privacy}","received_events_url":"https://api.github.com/users/kiszk/received_events","type":"User","site_admin":false},"body":"IIUC, an signature of `apply()` is `apply(Object)`. It also introduces additional boxing overhead.","created_at":"2016-12-24T08:51:05Z","updated_at":"2016-12-24T08:51:05Z","html_url":"https://github.com/apache/spark/pull/16391#discussion_r93814766","pull_request_url":"https://api.github.com/repos/apache/spark/pulls/16391","_links":{"self":{"href":"https://api.github.com/repos/apache/spark/pulls/comments/93814766"},"html":{"href":"https://github.com/apache/spark/pull/16391#discussion_r93814766"},"pull_request":{"href":"https://api.github.com/repos/apache/spark/pulls/16391"}}},"pull_request":{"url":"https://api.github.com/repos/apache/spark/pulls/16391","id":99266947,"html_url":"https://github.com/apache/spark/pull/16391","diff_url":"https://github.com/apache/spark/pull/16391.diff","patch_url":"https://github.com/apache/spark/pull/16391.patch","issue_url":"https://api.github.com/repos/apache/spark/issues/16391","number":16391,"state":"open","locked":false,"title":"[SPARK-18990][SQL] make DatasetBenchmark fairer for Dataset","user":{"login":"cloud-fan","id":3182036,"avatar_url":"https://avatars.githubusercontent.com/u/3182036?v=3","gravatar_id":"","url":"https://api.github.com/users/cloud-fan","html_url":"https://github.com/cloud-fan","followers_url":"https://api.github.com/users/cloud-fan/followers","following_url":"https://api.github.com/users/cloud-fan/following{/other_user}","gists_url":"https://api.github.com/users/cloud-fan/gists{/gist_id}","starred_url":"https://api.github.com/users/cloud-fan/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/cloud-fan/subscriptions","organizations_url":"https://api.github.com/users/cloud-fan/orgs","repos_url":"https://api.github.com/users/cloud-fan/repos","events_url":"https://api.github.com/users/cloud-fan/events{/privacy}","received_events_url":"https://api.github.com/users/cloud-fan/received_events","type":"User","site_admin":false},"body":"## What changes were proposed in this pull request?\r\n\r\nCurrently `DatasetBenchmark` use `case class Data(l: Long, s: String)` as the record type of `RDD` and `Dataset`, which introduce serialization overhead only to `Dataset` and is unfair.\r\n\r\nThis PR use `Long` as the record type, to be fairer for `Dataset`\r\n\r\n## How was this patch tested?\r\n\r\nexisting 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