{"action":"created","comment":{"url":"https://api.github.com/repos/apache/spark/pulls/comments/230781583","pull_request_review_id":171595242,"id":230781583,"node_id":"MDI0OlB1bGxSZXF1ZXN0UmV2aWV3Q29tbWVudDIzMDc4MTU4Mw==","diff_hunk":"@@ -1556,6 +1556,14 @@ class DatasetSuite extends QueryTest with SharedSQLContext {\n       df.where($\"city\".contains(new java.lang.Character('A'))),\n       Seq(Row(\"Amsterdam\")))\n   }\n+\n+  test(\"SPARK-25942: typed aggregation on primitive data\") {","path":"sql/core/src/test/scala/org/apache/spark/sql/DatasetSuite.scala","position":5,"original_position":5,"commit_id":"5ef23f27593efa968bed764a21988ccd7583a44c","original_commit_id":"5ef23f27593efa968bed764a21988ccd7583a44c","user":{"login":"viirya","id":68855,"node_id":"MDQ6VXNlcjY4ODU1","avatar_url":"https://avatars1.githubusercontent.com/u/68855?v=4","gravatar_id":"","url":"https://api.github.com/users/viirya","html_url":"https://github.com/viirya","followers_url":"https://api.github.com/users/viirya/followers","following_url":"https://api.github.com/users/viirya/following{/other_user}","gists_url":"https://api.github.com/users/viirya/gists{/gist_id}","starred_url":"https://api.github.com/users/viirya/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/viirya/subscriptions","organizations_url":"https://api.github.com/users/viirya/orgs","repos_url":"https://api.github.com/users/viirya/repos","events_url":"https://api.github.com/users/viirya/events{/privacy}","received_events_url":"https://api.github.com/users/viirya/received_events","type":"User","site_admin":false},"body":"It should not be introduced recently. I think we encode primitive data as a `value` field at beginning. \r\n\r\nBecause `AppendColumns` takes serializers' named expressions as `newColumns`. For primitive data, it conflicts with original data attribute `value`.","created_at":"2018-11-05T15:02:02Z","updated_at":"2018-11-05T15:02:02Z","html_url":"https://github.com/apache/spark/pull/22944#discussion_r230781583","pull_request_url":"https://api.github.com/repos/apache/spark/pulls/22944","author_association":"CONTRIBUTOR","_links":{"self":{"href":"https://api.github.com/repos/apache/spark/pulls/comments/230781583"},"html":{"href":"https://github.com/apache/spark/pull/22944#discussion_r230781583"},"pull_request":{"href":"https://api.github.com/repos/apache/spark/pulls/22944"}},"in_reply_to_id":230772018},"pull_request":{"url":"https://api.github.com/repos/apache/spark/pulls/22944","id":228281246,"node_id":"MDExOlB1bGxSZXF1ZXN0MjI4MjgxMjQ2","html_url":"https://github.com/apache/spark/pull/22944","diff_url":"https://github.com/apache/spark/pull/22944.diff","patch_url":"https://github.com/apache/spark/pull/22944.patch","issue_url":"https://api.github.com/repos/apache/spark/issues/22944","number":22944,"state":"open","locked":false,"title":"[SPARK-25942][SQL] Fix Dataset.groupByKey to make it work on primitive data","user":{"login":"viirya","id":68855,"node_id":"MDQ6VXNlcjY4ODU1","avatar_url":"https://avatars1.githubusercontent.com/u/68855?v=4","gravatar_id":"","url":"https://api.github.com/users/viirya","html_url":"https://github.com/viirya","followers_url":"https://api.github.com/users/viirya/followers","following_url":"https://api.github.com/users/viirya/following{/other_user}","gists_url":"https://api.github.com/users/viirya/gists{/gist_id}","starred_url":"https://api.github.com/users/viirya/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/viirya/subscriptions","organizations_url":"https://api.github.com/users/viirya/orgs","repos_url":"https://api.github.com/users/viirya/repos","events_url":"https://api.github.com/users/viirya/events{/privacy}","received_events_url":"https://api.github.com/users/viirya/received_events","type":"User","site_admin":false},"body":"## What changes were proposed in this pull request?\r\n\r\n`Dataset.groupByKey` can't work on primitive data now. When we access `value` in aggregate function, it conflicts with the name of grouping attribute.\r\n\r\n## How was this patch tested?\r\n\r\nAdded 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