{"action":"created","comment":{"url":"https://api.github.com/repos/pingcap/tidb/pulls/comments/88670459","pull_request_review_id":9238300,"id":88670459,"diff_hunk":"@@ -727,6 +727,9 @@ func (s *testParserSuite) TestIdentifier(c *C) {\n \t\t{`select 1 a, 1 \"a\", 1 'a'`, true},\n \t\t{`select * from t as \"a\"`, false},\n \t\t{`select * from t a`, true},\n+\t\t// reserved keyword can't be used as identifier directly, but A.B pattern is an exception\n+\t\t{`select COUNT from DESC`, false},\n+\t\t{`select COUNT from SELECT.DESC`, true},","path":"parser/parser_test.go","position":6,"original_position":6,"commit_id":"eae81432ae333209330c52e4f20097a1f3bad41f","original_commit_id":"2ad95e284e99de3b804307cc2807aa7956fdc279","user":{"login":"shenli","id":1192573,"avatar_url":"https://avatars.githubusercontent.com/u/1192573?v=3","gravatar_id":"","url":"https://api.github.com/users/shenli","html_url":"https://github.com/shenli","followers_url":"https://api.github.com/users/shenli/followers","following_url":"https://api.github.com/users/shenli/following{/other_user}","gists_url":"https://api.github.com/users/shenli/gists{/gist_id}","starred_url":"https://api.github.com/users/shenli/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/shenli/subscriptions","organizations_url":"https://api.github.com/users/shenli/orgs","repos_url":"https://api.github.com/users/shenli/repos","events_url":"https://api.github.com/users/shenli/events{/privacy}","received_events_url":"https://api.github.com/users/shenli/received_events","type":"User","site_admin":false},"body":"Could you add unit test like: https://github.com/pingcap/tidb/blob/master/parser/parser_test.go#L55\r\nSo all the keywords will be covered.","created_at":"2016-11-18T14:53:07Z","updated_at":"2016-11-18T14:53:07Z","html_url":"https://github.com/pingcap/tidb/pull/2027#discussion_r88670459","pull_request_url":"https://api.github.com/repos/pingcap/tidb/pulls/2027","_links":{"self":{"href":"https://api.github.com/repos/pingcap/tidb/pulls/comments/88670459"},"html":{"href":"https://github.com/pingcap/tidb/pull/2027#discussion_r88670459"},"pull_request":{"href":"https://api.github.com/repos/pingcap/tidb/pulls/2027"}}},"pull_request":{"url":"https://api.github.com/repos/pingcap/tidb/pulls/2027","id":94155731,"html_url":"https://github.com/pingcap/tidb/pull/2027","diff_url":"https://github.com/pingcap/tidb/pull/2027.diff","patch_url":"https://github.com/pingcap/tidb/pull/2027.patch","issue_url":"https://api.github.com/repos/pingcap/tidb/issues/2027","number":2027,"state":"open","locked":false,"title":"parser: database.ReservedKeyword as identifier & clean up","user":{"login":"tiancaiamao","id":1420062,"avatar_url":"https://avatars.githubusercontent.com/u/1420062?v=3","gravatar_id":"","url":"https://api.github.com/users/tiancaiamao","html_url":"https://github.com/tiancaiamao","followers_url":"https://api.github.com/users/tiancaiamao/followers","following_url":"https://api.github.com/users/tiancaiamao/following{/other_user}","gists_url":"https://api.github.com/users/tiancaiamao/gists{/gist_id}","starred_url":"https://api.github.com/users/tiancaiamao/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/tiancaiamao/subscriptions","organizations_url":"https://api.github.com/users/tiancaiamao/orgs","repos_url":"https://api.github.com/users/tiancaiamao/repos","events_url":"https://api.github.com/users/tiancaiamao/events{/privacy}","received_events_url":"https://api.github.com/users/tiancaiamao/received_events","type":"User","site_admin":false},"body":"1. fix a bug test.desc can't be used as identifier, which is valid in mysql\r\n2. introduce ReservedKeyword in parser.y and clean up\r\n\r\ndesc is a reserved keyword, before fix\r\n\r\n```\r\nmysql> select * from test.desc;\r\nERROR 1105 (HY000): line 0 column 23 near \"\"\r\n```\r\n\r\nafter fix\r\n\r\n```\r\nmysql> select * from test.desc;\r\nEmpty set (0.00 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