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/**
* Copyright (C) 2013-2014 MongoDB 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/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/db/query/canonical_query.h"
#include "mongo/db/query/plan_executor.h"
#include "mongo/db/query/query_planner_params.h"
#include "mongo/db/query/query_settings.h"
#include "mongo/db/query/query_solution.h"
#include "mongo/db/ops/delete_request.h"
#include "mongo/db/ops/parsed_delete.h"
#include "mongo/db/ops/parsed_update.h"
#include "mongo/db/ops/update_driver.h"
#include "mongo/db/ops/update_request.h"
namespace mongo {
class Collection;
class CountRequest;
struct GroupRequest;
/**
* Filter indexes retrieved from index catalog by
* allowed indices in query settings.
* Used by getExecutor().
* This function is public to facilitate testing.
*/
void filterAllowedIndexEntries(const AllowedIndices& allowedIndices,
std::vector<IndexEntry>* indexEntries);
/**
* Fill out the provided 'plannerParams' for the 'canonicalQuery' operating on the collection
* 'collection'. Exposed for testing.
*/
void fillOutPlannerParams(OperationContext* txn,
Collection* collection,
CanonicalQuery* canonicalQuery,
QueryPlannerParams* plannerParams);
/**
* Get a plan executor for a query.
*
* If the query is valid and an executor could be created, returns a StatusWith with the
* PlanExecutor.
*
* If the query cannot be executed, returns a Status indicating why.
*/
StatusWith<std::unique_ptr<PlanExecutor>> getExecutor(
OperationContext* txn,
Collection* collection,
std::unique_ptr<CanonicalQuery> canonicalQuery,
PlanExecutor::YieldPolicy yieldPolicy,
size_t plannerOptions = 0);
/**
* Get a plan executor for a .find() operation.
*
* If the query is valid and an executor could be created, returns a StatusWith with the
* PlanExecutor.
*
* If the query cannot be executed, returns a Status indicating why.
*/
StatusWith<std::unique_ptr<PlanExecutor>> getExecutorFind(
OperationContext* txn,
Collection* collection,
const NamespaceString& nss,
std::unique_ptr<CanonicalQuery> canonicalQuery,
PlanExecutor::YieldPolicy yieldPolicy);
/**
* If possible, turn the provided QuerySolution into a QuerySolution that uses a DistinctNode
* to provide results for the distinct command.
*
* If the provided solution could be mutated successfully, returns true, otherwise returns
* false.
*/
bool turnIxscanIntoDistinctIxscan(QuerySolution* soln, const std::string& field);
/*
* Get an executor for a query executing as part of a distinct command.
*
* Distinct is unique in that it doesn't care about getting all the results; it just wants all
* possible values of a certain field. As such, we can skip lots of data in certain cases (see
* body of method for detail).
*/
StatusWith<std::unique_ptr<PlanExecutor>> getExecutorDistinct(
OperationContext* txn,
Collection* collection,
const std::string& ns,
const BSONObj& query,
const std::string& field,
bool isExplain,
PlanExecutor::YieldPolicy yieldPolicy);
/*
* Get a PlanExecutor for a query executing as part of a count command.
*
* Count doesn't care about actually examining its results; it just wants to walk through them.
* As such, with certain covered queries, we can skip the overhead of fetching etc. when
* executing a count.
*/
StatusWith<std::unique_ptr<PlanExecutor>> getExecutorCount(OperationContext* txn,
Collection* collection,
const CountRequest& request,
bool explain,
PlanExecutor::YieldPolicy yieldPolicy);
/**
* Get a PlanExecutor for a delete operation. 'parsedDelete' describes the query predicate
* and delete flags like 'isMulti'. The caller must hold the appropriate MODE_X or MODE_IX
* locks, and must not release these locks until after the returned PlanExecutor is deleted.
*
* 'opDebug' Optional argument. When not null, will be used to record operation statistics.
*
* The returned PlanExecutor will used the YieldPolicy returned by parsedDelete->yieldPolicy().
*
* Does not take ownership of its arguments.
*
* If the query is valid and an executor could be created, returns a StatusWith with the
* PlanExecutor.
*
* If the query cannot be executed, returns a Status indicating why.
*/
StatusWith<std::unique_ptr<PlanExecutor>> getExecutorDelete(OperationContext* txn,
OpDebug* opDebug,
Collection* collection,
ParsedDelete* parsedDelete);
/**
* Get a PlanExecutor for an update operation. 'parsedUpdate' describes the query predicate
* and update modifiers. The caller must hold the appropriate MODE_X or MODE_IX locks prior
* to calling this function, and must not release these locks until after the returned
* PlanExecutor is deleted.
*
* 'opDebug' Optional argument. When not null, will be used to record operation statistics.
*
* The returned PlanExecutor will used the YieldPolicy returned by parsedUpdate->yieldPolicy().
*
* Does not take ownership of its arguments.
*
* If the query is valid and an executor could be created, returns a StatusWith with the
* PlanExecutor.
*
* If the query cannot be executed, returns a Status indicating why.
*/
StatusWith<std::unique_ptr<PlanExecutor>> getExecutorUpdate(OperationContext* txn,
OpDebug* opDebug,
Collection* collection,
ParsedUpdate* parsedUpdate);
/**
* Get a PlanExecutor for a group operation.
*
* If the query is valid and an executor could be created, returns a StatusWith with the
* PlanExecutor.
*
* If an executor could not be created, returns a Status indicating why.
*/
StatusWith<std::unique_ptr<PlanExecutor>> getExecutorGroup(OperationContext* txn,
Collection* collection,
const GroupRequest& request,
PlanExecutor::YieldPolicy yieldPolicy);
} // namespace mongo
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