{"action":"created","comment":{"url":"https://api.github.com/repos/pingcap/tidb/pulls/comments/43457784","id":43457784,"diff_hunk":"@@ -246,3 +244,30 @@ func (c *kvIndex) SeekFirst(txn Transaction) (iter IndexIterator, err error) {\n \t}\n \treturn &indexIter{it: it, idx: c, prefix: c.prefix}, nil\n }\n+\n+func (c *kvIndex) Exist(txn Transaction, indexedValues []interface{}, h int64) (bool, error) {\n+\tkey, err := c.genIndexKey(indexedValues, h)\n+\tif err != nil {\n+\t\treturn false, errors.Trace(err)\n+\t}\n+\n+\tvalue, err := txn.Get(key)\n+\tif IsErrNotFound(err) {\n+\t\treturn false, nil\n+\t}\n+\tif err != nil {\n+\t\treturn false, errors.Trace(err)\n+\t}\n+\n+\t// For uniq index, the value of key is handle.\n+\tif c.unique {\n+\t\thandle, err := decodeHandle(value)\n+\t\tif err != nil {\n+\t\t\treturn false, errors.Trace(err)\n+\t\t}\n+\n+\t\treturn h == handle, nil","path":"kv/index_iter.go","position":43,"original_position":43,"commit_id":"4252f8984e3b457c37ee99fd2075a446cd877093","original_commit_id":"4252f8984e3b457c37ee99fd2075a446cd877093","user":{"login":"siddontang","id":1080370,"avatar_url":"https://avatars.githubusercontent.com/u/1080370?v=3","gravatar_id":"","url":"https://api.github.com/users/siddontang","html_url":"https://github.com/siddontang","followers_url":"https://api.github.com/users/siddontang/followers","following_url":"https://api.github.com/users/siddontang/following{/other_user}","gists_url":"https://api.github.com/users/siddontang/gists{/gist_id}","starred_url":"https://api.github.com/users/siddontang/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/siddontang/subscriptions","organizations_url":"https://api.github.com/users/siddontang/orgs","repos_url":"https://api.github.com/users/siddontang/repos","events_url":"https://api.github.com/users/siddontang/events{/privacy}","received_events_url":"https://api.github.com/users/siddontang/received_events","type":"User","site_admin":false},"body":"If duplicated, I think return the duplicated handler may be better for outer use. \r\n\r\nso maybe the definition may be Get() (handler int64, err error)  ","created_at":"2015-10-29T23:34:20Z","updated_at":"2015-10-29T23:34:20Z","html_url":"https://github.com/pingcap/tidb/pull/481#discussion_r43457784","pull_request_url":"https://api.github.com/repos/pingcap/tidb/pulls/481","_links":{"self":{"href":"https://api.github.com/repos/pingcap/tidb/pulls/comments/43457784"},"html":{"href":"https://github.com/pingcap/tidb/pull/481#discussion_r43457784"},"pull_request":{"href":"https://api.github.com/repos/pingcap/tidb/pulls/481"}}},"pull_request":{"url":"https://api.github.com/repos/pingcap/tidb/pulls/481","id":49114892,"html_url":"https://github.com/pingcap/tidb/pull/481","diff_url":"https://github.com/pingcap/tidb/pull/481.diff","patch_url":"https://github.com/pingcap/tidb/pull/481.patch","issue_url":"https://api.github.com/repos/pingcap/tidb/issues/481","number":481,"state":"open","locked":false,"title":"*: add check index exist.","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":"","created_at":"2015-10-29T09:26:16Z","updated_at":"2015-10-29T23:34:20Z","closed_at":null,"merged_at":null,"merge_commit_sha":"acad981f3e3d022cfad23da9273200728480360d","assignee":null,"milestone":null,"commits_url":"https://api.github.com/repos/pingcap/tidb/pulls/481/commits","review_comments_url":"https://api.github.com/repos/pingcap/tidb/pulls/481/comments","review_comment_url":"https://api.github.com/repos/pingcap/tidb/pulls/comments{/number}","comments_url":"https://api.github.com/repos/pingcap/tidb/issues/481/comments","statuses_url":"https://api.github.com/repos/pingcap/tidb/statuses/4252f8984e3b457c37ee99fd2075a446cd877093","head":{"label":"pingcap:qiuyesuifeng/index-exist","ref":"qiuyesuifeng/index-exist","sha":"4252f8984e3b457c37ee99fd2075a446cd877093","user":{"login":"pingcap","id":11855343,"avatar_url":"https://avatars.githubusercontent.com/u/11855343?v=3","gravatar_id":"","url":"https://api.github.com/users/pingcap","html_url":"https://github.com/pingcap","followers_url":"https://api.github.com/users/pingcap/followers","following_url":"https://api.github.com/users/pingcap/following{/other_user}","gists_url":"https://api.github.com/users/pingcap/gists{/gist_id}","starred_url":"https://api.github.com/users/pingcap/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/pingcap/subscriptions","organizations_url":"https://api.github.com/users/pingcap/orgs","repos_url":"https://api.github.com/users/pingcap/repos","events_url":"https://api.github.com/users/pingcap/events{/privacy}","received_events_url":"https://api.github.com/users/pingcap/received_events","type":"Organization","site_admin":false},"repo":{"id":41986369,"name":"tidb","full_name":"pingcap/tidb","owner":{"login":"pingcap","id":11855343,"avatar_url":"https://avatars.githubusercontent.com/u/11855343?v=3","gravatar_id":"","url":"https://api.github.com/users/pingcap","html_url":"https://github.com/pingcap","followers_url":"https://api.github.com/users/pingcap/followers","following_url":"https://api.github.com/users/pingcap/following{/other_user}","gists_url":"https://api.github.com/users/pingcap/gists{/gist_id}","starred_url":"https://api.github.com/users/pingcap/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/pingcap/subscriptions","organizations_url":"https://api.github.com/users/pingcap/orgs","repos_url":"https://api.github.com/users/pingcap/repos","events_url":"https://api.github.com/users/pingcap/events{/privacy}","received_events_url":"https://api.github.com/users/pingcap/received_events","type":"Organization","site_admin":false},"private":false,"html_url":"https://github.com/pingcap/tidb","description":"TiDB is a distributed SQL database compatible with MySQL protocol.","fork":false,"url":"https://api.github.com/repos/pingcap/tidb","forks_url":"https://api.github.com/repos/pingcap/tidb/forks","keys_url":"https://api.github.com/repos/pingcap/tidb/keys{/key_id}","collaborators_url":"https://api.github.com/repos/pingcap/tidb/collaborators{/collaborator}","teams_url":"https://api.github.com/repos/pingcap/tidb/teams","hooks_url":"https://api.github.com/repos/pingcap/tidb/hooks","issue_events_url":"https://api.github.com/repos/pingcap/tidb/issues/events{/number}","events_url":"https://api.github.com/repos/pingcap/tidb/events","assignees_url":"https://api.github.com/repos/pingcap/tidb/assignees{/user}","branches_url":"https://api.github.com/repos/pingcap/tidb/branches{/branch}","tags_url":"https://api.github.com/repos/pingcap/tidb/tags","blobs_url":"https://api.github.com/repos/pingcap/tidb/git/blobs{/sha}","git_tags_url":"https://api.github.com/repos/pingcap/tidb/git/tags{/sha}","git_refs_url":"https://api.github.com/repos/pingcap/tidb/git/refs{/sha}","trees_url":"https://api.github.com/repos/pingcap/tidb/git/trees{/sha}","statuses_url":"https://api.github.com/repos/pingcap/tidb/statuses/{sha}","languages_url":"https://api.github.com/repos/pingcap/tidb/languages","stargazers_url":"https://api.github.com/repos/pingcap/tidb/stargazers","contributors_url":"https://api.github.com/repos/pingcap/tidb/contributors","subscribers_url":"https://api.github.com/repos/pingcap/tidb/subscribers","subscription_url":"https://api.github.com/repos/pingcap/tidb/subscription","commits_url":"https://api.github.com/repos/pingcap/tidb/commits{/sha}","git_commits_url":"https://api.github.com/repos/pingcap/tidb/git/commits{/sha}","comments_url":"https://api.github.com/repos/pingcap/tidb/comments{/number}","issue_comment_url":"https://api.github.com/repos/pingcap/tidb/issues/comments{/number}","contents_url":"https://api.github.com/repos/pingcap/tidb/contents/{+path}","compare_url":"https://api.github.com/repos/pingcap/tidb/compare/{base}...{head}","merges_url":"https://api.github.com/repos/pingcap/tidb/merges","archive_url":"https://api.github.com/repos/pingcap/tidb/{archive_format}{/ref}","downloads_url":"https://api.github.com/repos/pingcap/tidb/downloads","issues_url":"https://api.github.com/repos/pingcap/tidb/issues{/number}","pulls_url":"https://api.github.com/repos/pingcap/tidb/pulls{/number}","milestones_url":"https://api.github.com/repos/pingcap/tidb/milestones{/number}","notifications_url":"https://api.github.com/repos/pingcap/tidb/notifications{?since,all,participating}","labels_url":"https://api.github.com/repos/pingcap/tidb/labels{/name}","releases_url":"https://api.github.com/repos/pingcap/tidb/releases{/id}","created_at":"2015-09-06T04:01:52Z","updated_at":"2015-10-29T21:33:30Z","pushed_at":"2015-10-29T13:39:56Z","git_url":"git://github.com/pingcap/tidb.git","ssh_url":"git@github.com:pingcap/tidb.git","clone_url":"https://github.com/pingcap/tidb.git","svn_url":"https://github.com/pingcap/tidb","homepage":"","size":12887,"stargazers_count":2725,"watchers_count":2725,"language":"Go","has_issues":true,"has_downloads":true,"has_wiki":false,"has_pages":false,"forks_count":262,"mirror_url":null,"open_issues_count":55,"forks":262,"open_issues":55,"watchers":2725,"default_branch":"master"}},"base":{"label":"pingcap:master","ref":"master","sha":"7ea5f16b957a3f0b5a8ea6f9f6eab3c1b0d69c32","user":{"login":"pingcap","id":11855343,"avatar_url":"https://avatars.githubusercontent.com/u/11855343?v=3","gravatar_id":"","url":"https://api.github.com/users/pingcap","html_url":"https://github.com/pingcap","followers_url":"https://api.github.com/users/pingcap/followers","following_url":"https://api.github.com/users/pingcap/following{/other_user}","gists_url":"https://api.github.com/users/pingcap/gists{/gist_id}","starred_url":"https://api.github.com/users/pingcap/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/pingcap/subscriptions","organizations_url":"https://api.github.com/users/pingcap/orgs","repos_url":"https://api.github.com/users/pingcap/repos","events_url":"https://api.github.com/users/pingcap/events{/privacy}","received_events_url":"https://api.github.com/users/pingcap/received_events","type":"Organization","site_admin":false},"repo":{"id":41986369,"name":"tidb","full_name":"pingcap/tidb","owner":{"login":"pingcap","id":11855343,"avatar_url":"https://avatars.githubusercontent.com/u/11855343?v=3","gravatar_id":"","url":"https://api.github.com/users/pingcap","html_url":"https://github.com/pingcap","followers_url":"https://api.github.com/users/pingcap/followers","following_url":"https://api.github.com/users/pingcap/following{/other_user}","gists_url":"https://api.github.com/users/pingcap/gists{/gist_id}","starred_url":"https://api.github.com/users/pingcap/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/pingcap/subscriptions","organizations_url":"https://api.github.com/users/pingcap/orgs","repos_url":"https://api.github.com/users/pingcap/repos","events_url":"https://api.github.com/users/pingcap/events{/privacy}","received_events_url":"https://api.github.com/users/pingcap/received_events","type":"Organization","site_admin":false},"private":false,"html_url":"https://github.com/pingcap/tidb","description":"TiDB is a distributed SQL database compatible with MySQL protocol.","fork":false,"url":"https://api.github.com/repos/pingcap/tidb","forks_url":"https://api.github.com/repos/pingcap/tidb/forks","keys_url":"https://api.github.com/repos/pingcap/tidb/keys{/key_id}","collaborators_url":"https://api.github.com/repos/pingcap/tidb/collaborators{/collaborator}","teams_url":"https://api.github.com/repos/pingcap/tidb/teams","hooks_url":"https://api.github.com/repos/pingcap/tidb/hooks","issue_events_url":"https://api.github.com/repos/pingcap/tidb/issues/events{/number}","events_url":"https://api.github.com/repos/pingcap/tidb/events","assignees_url":"https://api.github.com/repos/pingcap/tidb/assignees{/user}","branches_url":"https://api.github.com/repos/pingcap/tidb/branches{/branch}","tags_url":"https://api.github.com/repos/pingcap/tidb/tags","blobs_url":"https://api.github.com/repos/pingcap/tidb/git/blobs{/sha}","git_tags_url":"https://api.github.com/repos/pingcap/tidb/git/tags{/sha}","git_refs_url":"https://api.github.com/repos/pingcap/tidb/git/refs{/sha}","trees_url":"https://api.github.com/repos/pingcap/tidb/git/trees{/sha}","statuses_url":"https://api.github.com/repos/pingcap/tidb/statuses/{sha}","languages_url":"https://api.github.com/repos/pingcap/tidb/languages","stargazers_url":"https://api.github.com/repos/pingcap/tidb/stargazers","contributors_url":"https://api.github.com/repos/pingcap/tidb/contributors","subscribers_url":"https://api.github.com/repos/pingcap/tidb/subscribers","subscription_url":"https://api.github.com/repos/pingcap/tidb/subscription","commits_url":"https://api.github.com/repos/pingcap/tidb/commits{/sha}","git_commits_url":"https://api.github.com/repos/pingcap/tidb/git/commits{/sha}","comments_url":"https://api.github.com/repos/pingcap/tidb/comments{/number}","issue_comment_url":"https://api.github.com/repos/pingcap/tidb/issues/comments{/number}","contents_url":"https://api.github.com/repos/pingcap/tidb/contents/{+path}","compare_url":"https://api.github.com/repos/pingcap/tidb/compare/{base}...{head}","merges_url":"https://api.github.com/repos/pingcap/tidb/merges","archive_url":"https://api.github.com/repos/pingcap/tidb/{archive_format}{/ref}","downloads_url":"https://api.github.com/repos/pingcap/tidb/downloads","issues_url":"https://api.github.com/repos/pingcap/tidb/issues{/number}","pulls_url":"https://api.github.com/repos/pingcap/tidb/pulls{/number}","milestones_url":"https://api.github.com/repos/pingcap/tidb/milestones{/number}","notifications_url":"https://api.github.com/repos/pingcap/tidb/notifications{?since,all,participating}","labels_url":"https://api.github.com/repos/pingcap/tidb/labels{/name}","releases_url":"https://api.github.com/repos/pingcap/tidb/releases{/id}","created_at":"2015-09-06T04:01:52Z","updated_at":"2015-10-29T21:33:30Z","pushed_at":"2015-10-29T13:39:56Z","git_url":"git://github.com/pingcap/tidb.git","ssh_url":"git@github.com:pingcap/tidb.git","clone_url":"https://github.com/pingcap/tidb.git","svn_url":"https://github.com/pingcap/tidb","homepage":"","size":12887,"stargazers_count":2725,"watchers_count":2725,"language":"Go","has_issues":true,"has_downloads":true,"has_wiki":false,"has_pages":false,"forks_count":262,"mirror_url":null,"open_issues_count":55,"forks":262,"open_issues":55,"watchers":2725,"default_branch":"master"}},"_links":{"self":{"href":"https://api.github.com/repos/pingcap/tidb/pulls/481"},"html":{"href":"https://github.com/pingcap/tidb/pull/481"},"issue":{"href":"https://api.github.com/repos/pingcap/tidb/issues/481"},"comments":{"href":"https://api.github.com/repos/pingcap/tidb/issues/481/comments"},"review_comments":{"href":"https://api.github.com/repos/pingcap/tidb/pulls/481/comments"},"review_comment":{"href":"https://api.github.com/repos/pingcap/tidb/pulls/comments{/number}"},"commits":{"href":"https://api.github.com/repos/pingcap/tidb/pulls/481/commits"},"statuses":{"href":"https://api.github.com/repos/pingcap/tidb/statuses/4252f8984e3b457c37ee99fd2075a446cd877093"}}}}