{"action":"created","comment":{"url":"https://api.github.com/repos/pingcap/tidb/pulls/comments/41350133","id":41350133,"diff_hunk":"@@ -122,3 +137,32 @@ func (s *testBuiltinSuite) TestRepeat(c *C) {\n \tc.Assert(err, IsNil)\n \tc.Assert(v, Equals, \"\")\n }\n+\n+func (s *testBuiltinSuite) TestLowerAndUpper(c *C) {\n+\tv, err := builtinLower([]interface{}{nil}, nil)\n+\tc.Assert(err, IsNil)\n+\tc.Assert(v, IsNil)\n+\n+\tv, err = builtinUpper([]interface{}{nil}, nil)\n+\tc.Assert(err, IsNil)\n+\tc.Assert(v, IsNil)\n+\n+\ttbl := []struct {\n+\t\tInput  interface{}\n+\t\tExpect string\n+\t}{\n+\t\t{\"abc\", \"abc\"},\n+\t\t{1, \"1\"},\n+\t}\n+\n+\tfor _, t := range tbl {","path":"expression/builtin/string_test.go","position":65,"original_position":65,"commit_id":"039bbc6c44c792b2a9f675acbbff5d82d27e483e","original_commit_id":"039bbc6c44c792b2a9f675acbbff5d82d27e483e","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":"OK. I did not notice it.","created_at":"2015-10-07T04:22:09Z","updated_at":"2015-10-07T04:22:09Z","html_url":"https://github.com/pingcap/tidb/pull/314#discussion_r41350133","pull_request_url":"https://api.github.com/repos/pingcap/tidb/pulls/314","_links":{"self":{"href":"https://api.github.com/repos/pingcap/tidb/pulls/comments/41350133"},"html":{"href":"https://github.com/pingcap/tidb/pull/314#discussion_r41350133"},"pull_request":{"href":"https://api.github.com/repos/pingcap/tidb/pulls/314"}}},"pull_request":{"url":"https://api.github.com/repos/pingcap/tidb/pulls/314","id":46985128,"html_url":"https://github.com/pingcap/tidb/pull/314","diff_url":"https://github.com/pingcap/tidb/pull/314.diff","patch_url":"https://github.com/pingcap/tidb/pull/314.patch","issue_url":"https://api.github.com/repos/pingcap/tidb/issues/314","number":314,"state":"open","locked":false,"title":"update string 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