mirror of
https://github.com/mongodb/mongo.git
synced 2024-11-30 09:06:21 +01:00
54 lines
1.5 KiB
C++
54 lines
1.5 KiB
C++
/* queryoptimizer.h */
|
|
|
|
/**
|
|
* Copyright (C) 2008 10gen Inc.
|
|
*
|
|
* This program is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU Affero General Public License, version 3,
|
|
* as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU Affero General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Affero General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
namespace mongo {
|
|
|
|
class QueryPlan {
|
|
public:
|
|
QueryPlan() {
|
|
scanAndOrderRequired = false;
|
|
simpleKeyMatch = false;
|
|
}
|
|
|
|
auto_ptr<Cursor> cursor;
|
|
|
|
/* ScanAndOrder processing will be required if true */
|
|
bool scanAndOrderRequired;
|
|
|
|
/* When true, the index we are using has keys such that it can completely resolve the
|
|
query expression to match by itself without ever checking the main object.
|
|
*/
|
|
bool simpleKeyMatch;
|
|
};
|
|
|
|
/* We put these objects inside the Database objects: that way later if we want to do
|
|
stats, it's in the right place.
|
|
*/
|
|
class QueryOptimizer {
|
|
public:
|
|
QueryPlan getPlan(
|
|
const char *ns,
|
|
BSONObj* query,
|
|
BSONObj* order = 0,
|
|
BSONObj* hint = 0);
|
|
};
|
|
|
|
} // namespace mongo
|