{"action":"created","comment":{"url":"https://api.github.com/repos/apache/spark/pulls/comments/93955613","pull_request_review_id":14486623,"id":93955613,"diff_hunk":"@@ -133,24 +134,29 @@ object DatasetBenchmark {\n   def aggregate(spark: SparkSession, numRows: Long): Benchmark = {\n     import spark.implicits._\n \n-    val df = spark.range(1, numRows).select($\"id\".as(\"l\"), $\"id\".cast(StringType).as(\"s\"))\n+    val rdd = spark.sparkContext.range(0, numRows)\n+    val ds = spark.range(0, numRows)\n+    val df = ds.toDF(\"l\")\n+\n     val benchmark = new Benchmark(\"aggregate\", numRows)\n \n-    val rdd = spark.sparkContext.range(1, numRows).map(l => Data(l, l.toString))\n     benchmark.addCase(\"RDD sum\") { iter =>\n-      rdd.aggregate(0L)(_ + _.l, _ + _)\n+      rdd.map(l => (l % 10, l)).reduceByKey(_ + _).foreach(_ => Unit)","path":"sql/core/src/test/scala/org/apache/spark/sql/DatasetBenchmark.scala","position":86,"original_position":86,"commit_id":"2a4d22db999330320ae18b1281d6b355b565c4d1","original_commit_id":"43da0af12b40e1425e95fc944723b2a6539dbabc","user":{"login":"yhuai","id":2072857,"avatar_url":"https://avatars.githubusercontent.com/u/2072857?v=3","gravatar_id":"","url":"https://api.github.com/users/yhuai","html_url":"https://github.com/yhuai","followers_url":"https://api.github.com/users/yhuai/followers","following_url":"https://api.github.com/users/yhuai/following{/other_user}","gists_url":"https://api.github.com/users/yhuai/gists{/gist_id}","starred_url":"https://api.github.com/users/yhuai/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/yhuai/subscriptions","organizations_url":"https://api.github.com/users/yhuai/orgs","repos_url":"https://api.github.com/users/yhuai/repos","events_url":"https://api.github.com/users/yhuai/events{/privacy}","received_events_url":"https://api.github.com/users/yhuai/received_events","type":"User","site_admin":false},"body":"Actually, I think we should also have a test case for aggregation without group by.","created_at":"2016-12-27T17:59:16Z","updated_at":"2016-12-27T17:59:16Z","html_url":"https://github.com/apache/spark/pull/16391#discussion_r93955613","pull_request_url":"https://api.github.com/repos/apache/spark/pulls/16391","_links":{"self":{"href":"https://api.github.com/repos/apache/spark/pulls/comments/93955613"},"html":{"href":"https://github.com/apache/spark/pull/16391#discussion_r93955613"},"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":"closed","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 tests","created_at":"2016-12-23T17:40:34Z","updated_at":"2016-12-27T17:59:16Z","closed_at":"2016-12-27T14:44:40Z","merged_at":null,"merge_commit_sha":"4826c71ab54527595df2727a5b06d0c8539e563e","assignee":null,"assignees":[],"milestone":null,"commits_url":"https://api.github.com/repos/apache/spark/pulls/16391/commits","review_comments_url":"https://api.github.com/repos/apache/spark/pulls/16391/comments","review_comment_url":"https://api.github.com/repos/apache/spark/pulls/comments{/number}","comments_url":"https://api.github.com/repos/apache/spark/issues/16391/comments","statuses_url":"https://api.github.com/repos/apache/spark/statuses/2a4d22db999330320ae18b1281d6b355b565c4d1","head":{"label":"cloud-fan:benchmark","ref":"benchmark","sha":"2a4d22db999330320ae18b1281d6b355b565c4d1","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},"repo":{"id":19689699,"name":"spark","full_name":"cloud-fan/spark","owner":{"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},"private":false,"html_url":"https://github.com/cloud-fan/spark","description":"Mirror 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