{"action":"created","comment":{"url":"https://api.github.com/repos/apache/spark/pulls/comments/26013109","id":26013109,"diff_hunk":"@@ -179,7 +179,12 @@ private[hive] case class HiveGenericUdf(funcWrapper: HiveFunctionWrapper, childr\n         })\n       i += 1\n     }\n-    unwrap(function.evaluate(deferedObjects), returnInspector)\n+    \n+    if (function.getUdfName().endsWith(\"UDFCurrentDB\")) 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seems a hack to me, can you create a UDF instead of intercepting code here?","created_at":"2015-03-09T02:40:50Z","updated_at":"2015-03-09T02:40:50Z","html_url":"https://github.com/apache/spark/pull/4926#discussion_r26013109","pull_request_url":"https://api.github.com/repos/apache/spark/pulls/4926","_links":{"self":{"href":"https://api.github.com/repos/apache/spark/pulls/comments/26013109"},"html":{"href":"https://github.com/apache/spark/pull/4926#discussion_r26013109"},"pull_request":{"href":"https://api.github.com/repos/apache/spark/pulls/4926"}}},"pull_request":{"url":"https://api.github.com/repos/apache/spark/pulls/4926","id":30619595,"html_url":"https://github.com/apache/spark/pull/4926","diff_url":"https://github.com/apache/spark/pull/4926.diff","patch_url":"https://github.com/apache/spark/pull/4926.patch","issue_url":"https://api.github.com/repos/apache/spark/issues/4926","number":4926,"state":"open","locked":false,"title":"[SPARK-6198][SQL] Support \"select current_database()\"","user":{"login":"DoingDone9","id":7529754,"avatar_url":"https://avatars.githubusercontent.com/u/7529754?v=3","gravatar_id":"","url":"https://api.github.com/users/DoingDone9","html_url":"https://github.com/DoingDone9","followers_url":"https://api.github.com/users/DoingDone9/followers","following_url":"https://api.github.com/users/DoingDone9/following{/other_user}","gists_url":"https://api.github.com/users/DoingDone9/gists{/gist_id}","starred_url":"https://api.github.com/users/DoingDone9/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/DoingDone9/subscriptions","organizations_url":"https://api.github.com/users/DoingDone9/orgs","repos_url":"https://api.github.com/users/DoingDone9/repos","events_url":"https://api.github.com/users/DoingDone9/events{/privacy}","received_events_url":"https://api.github.com/users/DoingDone9/received_events","type":"User","site_admin":false},"body":"The method(evaluate) has changed in UDFCurrentDB, it just throws a exception.But hiveUdfs call this method and failed.\r\n@Override\r\npublic Object evaluate(DeferredObject[] arguments) throws HiveException\r\n{ throw new IllegalStateException(\"never\"); 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