{"action":"created","comment":{"url":"https://api.github.com/repos/apache/spark/pulls/comments/55292326","id":55292326,"diff_hunk":"@@ -114,27 +117,67 @@ trait CodegenSupport extends SparkPlan {\n   }\n \n   /**\n-    * Consume the columns generated from it's child, call doConsume() or emit the rows.\n+    * Returns source code to evaluate all the variables, and clear the code of them, to prevent\n+    * them to be evaluated twice.\n+    */\n+  protected def evaluateVariables(variables: Seq[ExprCode]): String = {","path":"sql/core/src/main/scala/org/apache/spark/sql/execution/WholeStageCodegen.scala","position":40,"original_position":40,"commit_id":"ffc9d8ca90192df2e2cff0b8ed4900b8c97601b0","original_commit_id":"ffc9d8ca90192df2e2cff0b8ed4900b8c97601b0","user":{"login":"nongli","id":242468,"avatar_url":"https://avatars.githubusercontent.com/u/242468?v=3","gravatar_id":"","url":"https://api.github.com/users/nongli","html_url":"https://github.com/nongli","followers_url":"https://api.github.com/users/nongli/followers","following_url":"https://api.github.com/users/nongli/following{/other_user}","gists_url":"https://api.github.com/users/nongli/gists{/gist_id}","starred_url":"https://api.github.com/users/nongli/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/nongli/subscriptions","organizations_url":"https://api.github.com/users/nongli/orgs","repos_url":"https://api.github.com/users/nongli/repos","events_url":"https://api.github.com/users/nongli/events{/privacy}","received_events_url":"https://api.github.com/users/nongli/received_events","type":"User","site_admin":false},"body":"Can you update the comment for ExprCode.code to specify what it means when it is empty.","created_at":"2016-03-07T23:28:28Z","updated_at":"2016-03-07T23:28:28Z","html_url":"https://github.com/apache/spark/pull/11274#discussion_r55292326","pull_request_url":"https://api.github.com/repos/apache/spark/pulls/11274","_links":{"self":{"href":"https://api.github.com/repos/apache/spark/pulls/comments/55292326"},"html":{"href":"https://github.com/apache/spark/pull/11274#discussion_r55292326"},"pull_request":{"href":"https://api.github.com/repos/apache/spark/pulls/11274"}}},"pull_request":{"url":"https://api.github.com/repos/apache/spark/pulls/11274","id":59984684,"html_url":"https://github.com/apache/spark/pull/11274","diff_url":"https://github.com/apache/spark/pull/11274.diff","patch_url":"https://github.com/apache/spark/pull/11274.patch","issue_url":"https://api.github.com/repos/apache/spark/issues/11274","number":11274,"state":"open","locked":false,"title":"[SPARK-13404] [SQL] Create variables for input row when it's actually used","user":{"login":"davies","id":40902,"avatar_url":"https://avatars.githubusercontent.com/u/40902?v=3","gravatar_id":"","url":"https://api.github.com/users/davies","html_url":"https://github.com/davies","followers_url":"https://api.github.com/users/davies/followers","following_url":"https://api.github.com/users/davies/following{/other_user}","gists_url":"https://api.github.com/users/davies/gists{/gist_id}","starred_url":"https://api.github.com/users/davies/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/davies/subscriptions","organizations_url":"https://api.github.com/users/davies/orgs","repos_url":"https://api.github.com/users/davies/repos","events_url":"https://api.github.com/users/davies/events{/privacy}","received_events_url":"https://api.github.com/users/davies/received_events","type":"User","site_admin":false},"body":"## What changes were proposed in this pull request?\r\n\r\nRight now, we create the variables in the first operator (usually InputAdapter), they could be wasted if most of rows after filtered out immediately.\r\n\r\nThis PR change to defer that until they are used by following operators.\r\n\r\nThis PR also change the `if` from \r\n```\r\nif (cond) {\r\n  xxx\r\n}\r\n```\r\nto \r\n```\r\nif (!cond) continue;\r\nxxx\r\n```\r\nThe new one could help to reduce the nested indents for multiple levels of Filter and BroadcastHashJoin.\r\n\r\nIt also added some comments for operators.\r\n\r\n## How was the this patch tested?\r\n\r\nUnit tests. Manually ran TPCDS Q55, this PR improve the performance about 6% (scale=10, from 4.9s to 4.6s)\r\n","created_at":"2016-02-19T18:01:46Z","updated_at":"2016-03-07T23:28:28Z","closed_at":null,"merged_at":null,"merge_commit_sha":"f7bf7d20879ca0bccd62b34b4171612e10b4c6de","assignee":null,"milestone":null,"commits_url":"https://api.github.com/repos/apache/spark/pulls/11274/commits","review_comments_url":"https://api.github.com/repos/apache/spark/pulls/11274/comments","review_comment_url":"https://api.github.com/repos/apache/spark/pulls/comments{/number}","comments_url":"https://api.github.com/repos/apache/spark/issues/11274/comments","statuses_url":"https://api.github.com/repos/apache/spark/statuses/ffc9d8ca90192df2e2cff0b8ed4900b8c97601b0","head":{"label":"davies:gen_defer","ref":"gen_defer","sha":"ffc9d8ca90192df2e2cff0b8ed4900b8c97601b0","user":{"login":"davies","id":40902,"avatar_url":"https://avatars.githubusercontent.com/u/40902?v=3","gravatar_id":"","url":"https://api.github.com/users/davies","html_url":"https://github.com/davies","followers_url":"https://api.github.com/users/davies/followers","following_url":"https://api.github.com/users/davies/following{/other_user}","gists_url":"https://api.github.com/users/davies/gists{/gist_id}","starred_url":"https://api.github.com/users/davies/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/davies/subscriptions","organizations_url":"https://api.github.com/users/davies/orgs","repos_url":"https://api.github.com/users/davies/repos","events_url":"https://api.github.com/users/davies/events{/privacy}","received_events_url":"https://api.github.com/users/davies/received_events","type":"User","site_admin":false},"repo":{"id":21724875,"name":"spark","full_name":"davies/spark","owner":{"login":"davies","id":40902,"avatar_url":"https://avatars.githubusercontent.com/u/40902?v=3","gravatar_id":"","url":"https://api.github.com/users/davies","html_url":"https://github.com/davies","followers_url":"https://api.github.com/users/davies/followers","following_url":"https://api.github.com/users/davies/following{/other_user}","gists_url":"https://api.github.com/users/davies/gists{/gist_id}","starred_url":"https://api.github.com/users/davies/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/davies/subscriptions","organizations_url":"https://api.github.com/users/davies/orgs","repos_url":"https://api.github.com/users/davies/repos","events_url":"https://api.github.com/users/davies/events{/privacy}","received_events_url":"https://api.github.com/users/davies/received_events","type":"User","site_admin":false},"private":false,"html_url":"https://github.com/davies/spark","description":"Mirror 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