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on adding parentheses.","created_at":"2015-06-11T07:53:46Z","updated_at":"2015-06-11T07:53:46Z","html_url":"https://github.com/apache/spark/pull/6755#discussion_r32197095","pull_request_url":"https://api.github.com/repos/apache/spark/pulls/6755","_links":{"self":{"href":"https://api.github.com/repos/apache/spark/pulls/comments/32197095"},"html":{"href":"https://github.com/apache/spark/pull/6755#discussion_r32197095"},"pull_request":{"href":"https://api.github.com/repos/apache/spark/pulls/6755"}}},"pull_request":{"url":"https://api.github.com/repos/apache/spark/pulls/6755","id":37427650,"html_url":"https://github.com/apache/spark/pull/6755","diff_url":"https://github.com/apache/spark/pull/6755.diff","patch_url":"https://github.com/apache/spark/pull/6755.patch","issue_url":"https://api.github.com/repos/apache/spark/issues/6755","number":6755,"state":"open","locked":false,"title":"[SPARK-8305] [SPARK-8190] [SQL] improve 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