{"action":"created","comment":{"url":"https://api.github.com/repos/apache/spark/pulls/comments/29994732","id":29994732,"diff_hunk":"@@ -77,4 +77,29 @@ package object expressions  {\n     /** Uses the given row to store the output of the projection. */\n     def target(row: MutableRow): MutableProjection\n   }\n+\n+  /**\n+   * A utility classes for check the expression equality in semantic, not literally.\n+   */\n+  trait ExpressionEquals","path":"sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/package.scala","position":8,"original_position":8,"commit_id":"04cd335351232577365c843251d35789f1169ee9","original_commit_id":"04cd335351232577365c843251d35789f1169ee9","user":{"login":"marmbrus","id":527,"avatar_url":"https://avatars.githubusercontent.com/u/527?v=3","gravatar_id":"","url":"https://api.github.com/users/marmbrus","html_url":"https://github.com/marmbrus","followers_url":"https://api.github.com/users/marmbrus/followers","following_url":"https://api.github.com/users/marmbrus/following{/other_user}","gists_url":"https://api.github.com/users/marmbrus/gists{/gist_id}","starred_url":"https://api.github.com/users/marmbrus/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/marmbrus/subscriptions","organizations_url":"https://api.github.com/users/marmbrus/orgs","repos_url":"https://api.github.com/users/marmbrus/repos","events_url":"https://api.github.com/users/marmbrus/events{/privacy}","received_events_url":"https://api.github.com/users/marmbrus/received_events","type":"User","site_admin":false},"body":"What is the point of this trait?  Creating a class hierarchy where you don't need one just adds complexity to the code.","created_at":"2015-05-09T17:46:12Z","updated_at":"2015-05-09T17:46:12Z","html_url":"https://github.com/apache/spark/pull/5798#discussion_r29994732","pull_request_url":"https://api.github.com/repos/apache/spark/pulls/5798","_links":{"self":{"href":"https://api.github.com/repos/apache/spark/pulls/comments/29994732"},"html":{"href":"https://github.com/apache/spark/pull/5798#discussion_r29994732"},"pull_request":{"href":"https://api.github.com/repos/apache/spark/pulls/5798"}}},"pull_request":{"url":"https://api.github.com/repos/apache/spark/pulls/5798","id":34423990,"html_url":"https://github.com/apache/spark/pull/5798","diff_url":"https://github.com/apache/spark/pull/5798.diff","patch_url":"https://github.com/apache/spark/pull/5798.patch","issue_url":"https://api.github.com/repos/apache/spark/issues/5798","number":5798,"state":"open","locked":false,"title":"[SPARK-7269] [SQL] Incorrect analysis for aggregation","user":{"login":"chenghao-intel","id":2367031,"avatar_url":"https://avatars.githubusercontent.com/u/2367031?v=3","gravatar_id":"","url":"https://api.github.com/users/chenghao-intel","html_url":"https://github.com/chenghao-intel","followers_url":"https://api.github.com/users/chenghao-intel/followers","following_url":"https://api.github.com/users/chenghao-intel/following{/other_user}","gists_url":"https://api.github.com/users/chenghao-intel/gists{/gist_id}","starred_url":"https://api.github.com/users/chenghao-intel/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/chenghao-intel/subscriptions","organizations_url":"https://api.github.com/users/chenghao-intel/orgs","repos_url":"https://api.github.com/users/chenghao-intel/repos","events_url":"https://api.github.com/users/chenghao-intel/events{/privacy}","received_events_url":"https://api.github.com/users/chenghao-intel/received_events","type":"User","site_admin":false},"body":"https://issues.apache.org/jira/browse/SPARK-7269\r\nIn a case in-sensitive system, the `AttributeReference` object may not the same literally, as the `name` in different capital, however, in semantic it's should be identical, as after being resolved, the `exprId` is exactly the same.\r\n\r\nFor example:\r\n```\r\nSELECT kEy + 1 FROM src GROUP BY key+ 1\r\n```\r\nIt's actually a legal query in HiveContext(case insensitive), however, it will fail in `CheckAnalysis` as\r\n`Add(AttributeReference(\"key\"), Literal(1))` and\r\n`Add(AttributeReference(\"kEy\"), Literal(1))` are not identical in literal. As we have code\r\n```scala\r\ncase e if groupingExprs.contains(e) => // OK\r\n```\r\nin `CheckAnalysis.scala` for `Aggregate`, as well as in `patterns.scala` for partial aggregation.\r\n\r\nIn order not to confusing people by overwriting the method `AttributeReference.equals()`, we provide a utility classes for the equality checking purpose.\r\n\r\nIn long term, we probably need to refactor the `Expression` a little bit for supporting the `semanticEquals()` instead of `equals()`(literally equality 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