{"action":"created","comment":{"url":"https://api.github.com/repos/pingcap/tidb/pulls/comments/48212569","id":48212569,"diff_hunk":"@@ -143,3 +143,23 @@ func (s *testIndexSuite) TestIndex(c *C) {\n \terr = txn.Commit()\n \tc.Assert(err, IsNil)\n }\n+\n+func (s *testIndexSuite) TestCombineIndexSeek(c *C) {\n+\tindex := kv.NewKVIndex(\"i\", \"test\", 1, false)\n+\n+\ttxn, err := s.s.Begin()\n+\tc.Assert(err, IsNil)\n+\n+\tvalues := []interface{}{\"abc\", \"def\"}\n+\terr = index.Create(txn, values, 1)\n+\tc.Assert(err, IsNil)\n+\n+\tindex2 := kv.NewKVIndex(\"i\", \"test\", 1, false)\n+\titer, hit, err := index2.Seek(txn, []interface{}{\"abc\", nil})\n+\tdefer iter.Close()","path":"kv/index_iter_test.go","position":17,"original_position":17,"commit_id":"abc4701b00a56c2319258b2a0733091fa6301835","original_commit_id":"abc4701b00a56c2319258b2a0733091fa6301835","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":"don't panic, check err first.","created_at":"2015-12-22T01:18:32Z","updated_at":"2015-12-22T01:18:32Z","html_url":"https://github.com/pingcap/tidb/pull/764#discussion_r48212569","pull_request_url":"https://api.github.com/repos/pingcap/tidb/pulls/764","_links":{"self":{"href":"https://api.github.com/repos/pingcap/tidb/pulls/comments/48212569"},"html":{"href":"https://github.com/pingcap/tidb/pull/764#discussion_r48212569"},"pull_request":{"href":"https://api.github.com/repos/pingcap/tidb/pulls/764"}}},"pull_request":{"url":"https://api.github.com/repos/pingcap/tidb/pulls/764","id":54221294,"html_url":"https://github.com/pingcap/tidb/pull/764","diff_url":"https://github.com/pingcap/tidb/pull/764.diff","patch_url":"https://github.com/pingcap/tidb/pull/764.patch","issue_url":"https://api.github.com/repos/pingcap/tidb/issues/764","number":764,"state":"open","locked":false,"title":"executor: make seek value with the same length of the index columns.","user":{"login":"coocood","id":891222,"avatar_url":"https://avatars.githubusercontent.com/u/891222?v=3","gravatar_id":"","url":"https://api.github.com/users/coocood","html_url":"https://github.com/coocood","followers_url":"https://api.github.com/users/coocood/followers","following_url":"https://api.github.com/users/coocood/following{/other_user}","gists_url":"https://api.github.com/users/coocood/gists{/gist_id}","starred_url":"https://api.github.com/users/coocood/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/coocood/subscriptions","organizations_url":"https://api.github.com/users/coocood/orgs","repos_url":"https://api.github.com/users/coocood/repos","events_url":"https://api.github.com/users/coocood/events{/privacy}","received_events_url":"https://api.github.com/users/coocood/received_events","type":"User","site_admin":false},"body":"For composite index with 2 columns, if we just pass one value in `Seek`, we will get the wrong result.\r\nSo this 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