{"action":"created","comment":{"url":"https://api.github.com/repos/apache/spark/pulls/comments/78940604","id":78940604,"diff_hunk":"@@ -121,10 +121,6 @@ class RowTest extends FunSpec with Matchers {\n       externalRow should be theSameInstanceAs externalRow.copy()\n     }\n \n-    it(\"copy should return same ref for internal rows\") {","path":"sql/catalyst/src/test/scala/org/apache/spark/sql/RowTest.scala","position":4,"original_position":4,"commit_id":"da6a2859c8fe0c90b4aa14a68c2234e6ede36fce","original_commit_id":"da6a2859c8fe0c90b4aa14a68c2234e6ede36fce","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":"As long as `InternalRow` can have mutable implementation, `InternalRow` is not immutable anymore, because it can have a struct field, whose value can be a `MutableRow`.","created_at":"2016-09-15T11:17:52Z","updated_at":"2016-09-15T11:17:53Z","html_url":"https://github.com/apache/spark/pull/15082#discussion_r78940604","pull_request_url":"https://api.github.com/repos/apache/spark/pulls/15082","_links":{"self":{"href":"https://api.github.com/repos/apache/spark/pulls/comments/78940604"},"html":{"href":"https://github.com/apache/spark/pull/15082#discussion_r78940604"},"pull_request":{"href":"https://api.github.com/repos/apache/spark/pulls/15082"}}},"pull_request":{"url":"https://api.github.com/repos/apache/spark/pulls/15082","id":85095163,"html_url":"https://github.com/apache/spark/pull/15082","diff_url":"https://github.com/apache/spark/pull/15082.diff","patch_url":"https://github.com/apache/spark/pull/15082.patch","issue_url":"https://api.github.com/repos/apache/spark/issues/15082","number":15082,"state":"open","locked":false,"title":"[SPARK-17528][SQL] MutableProjection should not cache content from the input row","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\nFor performance reasons, `UnsafeRow.getString`, `getStruct`, etc. return a \"pointer\" that points to a memory region of this unsafe row. This makes the unsafe projection a little dangerous, because all of its output rows share one instance.\r\n\r\nWhen we implement SQL operators, we should be careful to not cache the input rows because they may be produced by unsafe projection from child operator and thus its content may change overtime.\r\n\r\nHowever, `GenerateMutableProjection` breaks this and may cache the content in input rows. The sort based aggregate use it, but this bug is not exposed because sort based aggregate always do an extra projection for the input row.\r\n\r\nThis PR fixes the bug of `GenerateMutableProjection` and some related bugs in complex data copy, and remove the useless projection in sort based aggregate.\r\n\r\n\r\n## How was this patch tested?\r\n\r\nsome new 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