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/**
* Copyright (C) 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.
*/
#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kWrite
#include "mongo/platform/basic.h"
#include "mongo/db/ops/parsed_delete.h"
#include "mongo/db/catalog/collection.h"
#include "mongo/db/catalog/database.h"
#include "mongo/db/exec/delete.h"
#include "mongo/db/ops/delete_request.h"
#include "mongo/db/query/canonical_query.h"
#include "mongo/db/query/get_executor.h"
#include "mongo/db/query/query_planner_common.h"
#include "mongo/db/repl/replication_coordinator_global.h"
#include "mongo/util/assert_util.h"
#include "mongo/util/log.h"
#include "mongo/util/mongoutils/str.h"
namespace mongo {
ParsedDelete::ParsedDelete(OperationContext* txn, const DeleteRequest* request)
: _txn(txn), _request(request) {}
Status ParsedDelete::parseRequest() {
dassert(!_canonicalQuery.get());
// It is invalid to request that the DeleteStage return the deleted document during a
// multi-remove.
invariant(!(_request->shouldReturnDeleted() && _request->isMulti()));
// It is invalid to request that a ProjectionStage be applied to the DeleteStage if the
// DeleteStage would not return the deleted document.
invariant(_request->getProj().isEmpty() || _request->shouldReturnDeleted());
if (CanonicalQuery::isSimpleIdQuery(_request->getQuery())) {
return Status::OK();
}
return parseQueryToCQ();
}
Status ParsedDelete::parseQueryToCQ() {
dassert(!_canonicalQuery.get());
CanonicalQuery* cqRaw;
const WhereCallbackReal whereCallback(_txn, _request->getNamespaceString().db());
// Limit should only used for the findAndModify command when a sort is specified. If a sort
// is requested, we want to use a top-k sort for efficiency reasons, so should pass the
// limit through. Generally, a delete stage expects to be able to skip documents that were
// deleted out from under it, but a limit could inhibit that and give an EOF when the delete
// has not actually deleted a document. This behavior is fine for findAndModify, but should
// not apply to deletes in general.
long long limit = (!_request->isMulti() && !_request->getSort().isEmpty()) ? -1 : 0;
// The projection needs to be applied after the delete operation, so we specify an empty
// BSONObj as the projection during canonicalization.
const BSONObj emptyObj;
Status status = CanonicalQuery::canonicalize(_request->getNamespaceString().ns(),
_request->getQuery(),
_request->getSort(),
emptyObj, // projection
0, // skip
limit,
emptyObj, // hint
emptyObj, // min
emptyObj, // max
false, // snapshot
_request->isExplain(),
&cqRaw,
whereCallback);
if (status.isOK()) {
_canonicalQuery.reset(cqRaw);
}
return status;
}
const DeleteRequest* ParsedDelete::getRequest() const {
return _request;
}
bool ParsedDelete::canYield() const {
return !_request->isGod() && PlanExecutor::YIELD_AUTO == _request->getYieldPolicy() &&
!isIsolated();
}
bool ParsedDelete::isIsolated() const {
return _canonicalQuery.get()
? QueryPlannerCommon::hasNode(_canonicalQuery->root(), MatchExpression::ATOMIC)
: LiteParsedQuery::isQueryIsolated(_request->getQuery());
}
bool ParsedDelete::hasParsedQuery() const {
return _canonicalQuery.get() != NULL;
}
CanonicalQuery* ParsedDelete::releaseParsedQuery() {
invariant(_canonicalQuery.get() != NULL);
return _canonicalQuery.release();
}
} // namespace mongo
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