{"action":"created","comment":{"url":"https://api.github.com/repos/pingcap/tidb/pulls/comments/46790422","id":46790422,"diff_hunk":"@@ -0,0 +1,602 @@\n+// Copyright 2015 PingCAP, Inc.\n+//\n+// Licensed under the Apache License, Version 2.0 (the \"License\");\n+// you may not use this file except in compliance with the License.\n+// You may obtain a copy of the License at\n+//\n+//     http://www.apache.org/licenses/LICENSE-2.0\n+//\n+// Unless required by applicable law or agreed to in writing, software\n+// distributed under the License is distributed on an \"AS IS\" BASIS,\n+// See the License for the specific language governing permissions and\n+// limitations under the License.\n+\n+package executor\n+\n+import (\n+\t\"sort\"\n+\t\"strings\"\n+\n+\t\"fmt\"\n+\t\"github.com/juju/errors\"\n+\t\"github.com/ngaut/log\"\n+\t\"github.com/pingcap/tidb/ast\"\n+\t\"github.com/pingcap/tidb/context\"\n+\t\"github.com/pingcap/tidb/kv\"\n+\t\"github.com/pingcap/tidb/optimizer/evaluator\"\n+\t\"github.com/pingcap/tidb/optimizer/plan\"\n+\t\"github.com/pingcap/tidb/sessionctx/forupdate\"\n+\t\"github.com/pingcap/tidb/table\"\n+\t\"github.com/pingcap/tidb/util\"\n+\t\"github.com/pingcap/tidb/util/types\"\n+)\n+\n+var (\n+\t_ Executor = &TableScanExec{}\n+\t_ Executor = &IndexScanExec{}\n+\t_ Executor = &IndexRangeExec{}\n+\t_ Executor = &SelectFieldsExec{}\n+\t_ Executor = &FilterExec{}\n+\t_ Executor = &LimitExec{}\n+\t_ Executor = &SortExec{}\n+)\n+\n+// Row represents a record row.\n+type Row struct {\n+\t// Data is the output record data for current Plan.\n+\tData []interface{}\n+\n+\tRowKeys []*RowKeyEntry\n+}\n+\n+// RowKeyEntry is designed for Delete statement in multi-table mode,\n+// we should know which table this row comes from.\n+type RowKeyEntry struct {\n+\t// The table which this row come from.\n+\tTbl table.Table\n+\t// Row handle.\n+\tKey string\n+}\n+\n+// Executor executes a query.\n+type Executor interface {\n+\tFields() []*ast.ResultField\n+\tNext() (*Row, error)\n+\tClose() error\n+}\n+\n+// TableScanExec represents a table scan executor.\n+type TableScanExec struct {\n+\tt      table.Table\n+\tfields []*ast.ResultField\n+\titer   kv.Iterator\n+\tctx    context.Context\n+}\n+\n+// Fields implements Executor Fields interface.\n+func (e *TableScanExec) Fields() []*ast.ResultField {\n+\treturn e.fields\n+}\n+\n+// Next implements Execution Next interface.\n+func (e *TableScanExec) Next() (row *Row, err error) {\n+\tif e.iter == nil {\n+\t\tvar txn kv.Transaction\n+\t\ttxn, err = e.ctx.GetTxn(false)\n+\t\tif err != nil {\n+\t\t\treturn nil, errors.Trace(err)\n+\t\t}\n+\t\te.iter, err = txn.Seek([]byte(e.t.FirstKey()))\n+\t\tif err != nil {\n+\t\t\treturn nil, errors.Trace(err)\n+\t\t}\n+\t}\n+\tif !e.iter.Valid() || !strings.HasPrefix(e.iter.Key(), e.t.KeyPrefix()) {\n+\t\treturn\n+\t}\n+\t// TODO: check if lock valid\n+\t// the record layout in storage (key -> value):\n+\t// r1 -> lock-version\n+\t// r1_col1 -> r1 col1 value\n+\t// r1_col2 -> r1 col2 value\n+\t// r2 -> lock-version\n+\t// r2_col1 -> r2 col1 value\n+\t// r2_col2 -> r2 col2 value\n+\t// ...\n+\trowKey := e.iter.Key()\n+\thandle, err := util.DecodeHandleFromRowKey(rowKey)\n+\tif err != nil {\n+\t\treturn nil, errors.Trace(err)\n+\t}\n+\n+\t// TODO: we could just fetch mentioned columns' values\n+\trow = &Row{}\n+\trow.Data, err = e.t.Row(e.ctx, handle)\n+\tif err != nil {\n+\t\treturn nil, errors.Trace(err)\n+\t}\n+\t// Set result fields value.\n+\tfor i, v := range e.fields {\n+\t\tv.Expr.SetValue(row.Data[i])\n+\t}\n+\n+\t// Put rowKey to the tail of record row\n+\trke := &RowKeyEntry{\n+\t\tTbl: e.t,\n+\t\tKey: rowKey,\n+\t}\n+\trow.RowKeys = append(row.RowKeys, rke)\n+\n+\trk := e.t.RecordKey(handle, nil)\n+\terr = kv.NextUntil(e.iter, util.RowKeyPrefixFilter(rk))\n+\tif err != nil {\n+\t\treturn nil, errors.Trace(err)\n+\t}\n+\treturn\n+}\n+\n+// Close implements plan.Plan Close interface.\n+func (e *TableScanExec) Close() error {\n+\tif e.iter != nil {\n+\t\te.iter.Close()\n+\t\te.iter = nil\n+\t}\n+\treturn nil\n+}\n+\n+// IndexRangeExec represents an index range scan executor.\n+type IndexRangeExec struct {\n+\tscan *IndexScanExec\n+\n+\t// seekVal is different from lowVal, it is casted from lowVal and\n+\t// must be less than or equal to lowVal, used to seek the index.\n+\tlowVal      interface{}\n+\tlowExclude  bool\n+\thighVal     interface{}\n+\thighExclude bool\n+\n+\titer       kv.IndexIterator\n+\tskipLowCmp bool\n+\tfinished   bool\n+}\n+\n+// Fields implements Executor Fields interface.\n+func (e *IndexRangeExec) Fields() []*ast.ResultField {\n+\treturn e.scan.fields\n+}\n+\n+// Next implements Executor Next interface.\n+func (e *IndexRangeExec) Next() (*Row, error) {\n+\tif e.iter == nil {\n+\t\tvar seekVal interface{}\n+\t\tvar err error\n+\t\tif e.lowVal == plan.MinNotNullVal {\n+\t\t\tseekVal = []byte{}\n+\t\t} else {\n+\t\t\tseekVal, err = types.Convert(e.lowVal, &e.scan.valueType)\n+\t\t\tif err != nil {\n+\t\t\t\treturn nil, errors.Trace(err)\n+\t\t\t}\n+\t\t}\n+\t\ttxn, err := e.scan.ctx.GetTxn(false)\n+\t\tif err != nil {\n+\t\t\treturn nil, errors.Trace(err)\n+\t\t}\n+\t\te.iter, _, err = e.scan.idx.Seek(txn, []interface{}{seekVal})\n+\t\tif err != nil {\n+\t\t\treturn nil, types.EOFAsNil(err)\n+\t\t}\n+\t}\n+\tfor {\n+\t\tif e.finished {\n+\t\t\treturn nil, nil\n+\t\t}\n+\t\tidxKey, h, err := e.iter.Next()\n+\t\tif err != nil {\n+\t\t\treturn nil, types.EOFAsNil(err)\n+\t\t}\n+\t\tval := idxKey[0]\n+\t\tif !e.skipLowCmp {\n+\t\t\tcmp := indexCompare(val, e.lowVal)\n+\t\t\tif cmp < 0 || (cmp == 0 && e.lowExclude) {\n+\t\t\t\tcontinue\n+\t\t\t}\n+\t\t\te.skipLowCmp = true\n+\t\t}\n+\t\tcmp := indexCompare(val, e.highVal)\n+\t\tif cmp > 0 || (cmp == 0 && e.highExclude) {\n+\t\t\t// This span has finished iteration.\n+\t\t\te.finished = true\n+\t\t\te.skipLowCmp = false\n+\t\t\tcontinue\n+\t\t}\n+\t\tvar row *Row\n+\t\trow, err = e.lookupRow(h)\n+\t\tif err != nil {\n+\t\t\treturn nil, errors.Trace(err)\n+\t\t}\n+\t\treturn row, nil\n+\t}\n+}\n+\n+// comparison function that takes minNotNullVal and maxVal into account.\n+func indexCompare(a interface{}, b interface{}) int {\n+\tif a == nil && b == nil {\n+\t\treturn 0\n+\t} else if b == nil {\n+\t\treturn 1\n+\t} else if b == nil {","path":"executor/executor.go","position":228,"original_position":228,"commit_id":"de05f0b893fd8c5bc9bc979ce7c4640d9e98ed27","original_commit_id":"de05f0b893fd8c5bc9bc979ce7c4640d9e98ed27","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":"Duplicate condition of `b == nil` here.","created_at":"2015-12-07T06:39:44Z","updated_at":"2015-12-07T06:39:44Z","html_url":"https://github.com/pingcap/tidb/pull/651#discussion_r46790422","pull_request_url":"https://api.github.com/repos/pingcap/tidb/pulls/651","_links":{"self":{"href":"https://api.github.com/repos/pingcap/tidb/pulls/comments/46790422"},"html":{"href":"https://github.com/pingcap/tidb/pull/651#discussion_r46790422"},"pull_request":{"href":"https://api.github.com/repos/pingcap/tidb/pulls/651"}}},"pull_request":{"url":"https://api.github.com/repos/pingcap/tidb/pulls/651","id":51987941,"html_url":"https://github.com/pingcap/tidb/pull/651","diff_url":"https://github.com/pingcap/tidb/pull/651.diff","patch_url":"https://github.com/pingcap/tidb/pull/651.patch","issue_url":"https://api.github.com/repos/pingcap/tidb/issues/651","number":651,"state":"open","locked":false,"title":"optimizer, executor: Use new plan for simple select statement.","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":"composite index, IN, OR, LIKE expression and order by can use index now.","created_at":"2015-11-27T12:00:29Z","updated_at":"2015-12-07T06:39:44Z","closed_at":null,"merged_at":null,"merge_commit_sha":"50a55b10a44f9e808491443c796e2ddab08f8ce8","assignee":null,"milestone":null,"commits_url":"https://api.github.com/repos/pingcap/tidb/pulls/651/commits","review_comments_url":"https://api.github.com/repos/pingcap/tidb/pulls/651/comments","review_comment_url":"https://api.github.com/repos/pingcap/tidb/pulls/comments{/number}","comments_url":"https://api.github.com/repos/pingcap/tidb/issues/651/comments","statuses_url":"https://api.github.com/repos/pingcap/tidb/statuses/de05f0b893fd8c5bc9bc979ce7c4640d9e98ed27","head":{"label":"pingcap:coocood/new-plan","ref":"coocood/new-plan","sha":"de05f0b893fd8c5bc9bc979ce7c4640d9e98ed27","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 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