{"action":"created","comment":{"url":"https://api.github.com/repos/pingcap/tidb/pulls/comments/48598832","id":48598832,"diff_hunk":"@@ -87,6 +81,41 @@ func (c *costEstimator) Leave(p Plan) (Plan, bool) {\n \t}\n \treturn p, true\n }\n+\n+func (c *costEstimator) tableScan(v *TableScan) {\n+\tvar rowCount float64\n+\tif len(v.Ranges) == 1 && v.Ranges[0].LowVal == math.MinInt64 && v.Ranges[0].HighVal == math.MaxInt64 {\n+\t\t// full range use default row count.\n+\t\trowCount = FullRangeCount\n+\t} else {\n+\t\tfor _, v := range v.Ranges {\n+\t\t\t// for condition like 'a = 0'.\n+\t\t\tif v.LowVal == v.HighVal {\n+\t\t\t\trowCount++\n+\t\t\t\tcontinue\n+\t\t\t}\n+\t\t\t// For condition like 'a < 0'.\n+\t\t\tif v.LowVal == math.MinInt64 {\n+\t\t\t\trowCount += HalfRangeCount\n+\t\t\t}\n+\t\t\t// For condition like 'a > 0'.\n+\t\t\tif v.HighVal == math.MaxInt64 {\n+\t\t\t\trowCount += HalfRangeCount\n+\t\t\t}\n+\t\t\t// For condition like 'a > 0 and a < 1'.\n+\t\t\trowCount += 100","path":"optimizer/plan/cost.go","position":41,"original_position":41,"commit_id":"10c8f3a4c7f2ace8c9fb80b7c546e8a8a42cbf1c","original_commit_id":"10c8f3a4c7f2ace8c9fb80b7c546e8a8a42cbf1c","user":{"login":"qiuyesuifeng","id":1953644,"avatar_url":"https://avatars.githubusercontent.com/u/1953644?v=3","gravatar_id":"","url":"https://api.github.com/users/qiuyesuifeng","html_url":"https://github.com/qiuyesuifeng","followers_url":"https://api.github.com/users/qiuyesuifeng/followers","following_url":"https://api.github.com/users/qiuyesuifeng/following{/other_user}","gists_url":"https://api.github.com/users/qiuyesuifeng/gists{/gist_id}","starred_url":"https://api.github.com/users/qiuyesuifeng/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/qiuyesuifeng/subscriptions","organizations_url":"https://api.github.com/users/qiuyesuifeng/orgs","repos_url":"https://api.github.com/users/qiuyesuifeng/repos","events_url":"https://api.github.com/users/qiuyesuifeng/events{/privacy}","received_events_url":"https://api.github.com/users/qiuyesuifeng/received_events","type":"User","site_admin":false},"body":"Can 100 use a const value?","created_at":"2015-12-30T11:14:25Z","updated_at":"2015-12-30T11:14:25Z","html_url":"https://github.com/pingcap/tidb/pull/812#discussion_r48598832","pull_request_url":"https://api.github.com/repos/pingcap/tidb/pulls/812","_links":{"self":{"href":"https://api.github.com/repos/pingcap/tidb/pulls/comments/48598832"},"html":{"href":"https://github.com/pingcap/tidb/pull/812#discussion_r48598832"},"pull_request":{"href":"https://api.github.com/repos/pingcap/tidb/pulls/812"}}},"pull_request":{"url":"https://api.github.com/repos/pingcap/tidb/pulls/812","id":54783794,"html_url":"https://github.com/pingcap/tidb/pull/812","diff_url":"https://github.com/pingcap/tidb/pull/812.diff","patch_url":"https://github.com/pingcap/tidb/pull/812.patch","issue_url":"https://api.github.com/repos/pingcap/tidb/issues/812","number":812,"state":"open","locked":false,"title":"*: Unify PK and handle 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