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/**
* Copyright (C) 2013 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/>.
*
* 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/exec/or.h"
#include "mongo/db/exec/filter.h"
#include "mongo/db/exec/scoped_timer.h"
#include "mongo/db/exec/working_set_common.h"
#include "mongo/stdx/memory.h"
#include "mongo/util/mongoutils/str.h"
namespace mongo {
using std::unique_ptr;
using std::vector;
using stdx::make_unique;
// static
const char* OrStage::kStageType = "OR";
OrStage::OrStage(OperationContext* opCtx, WorkingSet* ws, bool dedup, const MatchExpression* filter)
: PlanStage(kStageType, opCtx), _ws(ws), _filter(filter), _currentChild(0), _dedup(dedup) {}
void OrStage::addChild(PlanStage* child) {
_children.emplace_back(child);
}
bool OrStage::isEOF() {
return _currentChild >= _children.size();
}
PlanStage::StageState OrStage::doWork(WorkingSetID* out) {
if (isEOF()) {
return PlanStage::IS_EOF;
}
WorkingSetID id = WorkingSet::INVALID_ID;
StageState childStatus = _children[_currentChild]->work(&id);
if (PlanStage::ADVANCED == childStatus) {
WorkingSetMember* member = _ws->get(id);
// If we're deduping (and there's something to dedup by)
if (_dedup && member->hasRecordId()) {
++_specificStats.dupsTested;
// ...and we've seen the RecordId before
if (_seen.end() != _seen.find(member->recordId)) {
// ...drop it.
++_specificStats.dupsDropped;
_ws->free(id);
return PlanStage::NEED_TIME;
} else {
// Otherwise, note that we've seen it.
_seen.insert(member->recordId);
}
}
if (Filter::passes(member, _filter)) {
// Match! return it.
*out = id;
return PlanStage::ADVANCED;
} else {
// Does not match, try again.
_ws->free(id);
return PlanStage::NEED_TIME;
}
} else if (PlanStage::IS_EOF == childStatus) {
// Done with _currentChild, move to the next one.
++_currentChild;
// Maybe we're out of children.
if (isEOF()) {
return PlanStage::IS_EOF;
} else {
return PlanStage::NEED_TIME;
}
} else if (PlanStage::FAILURE == childStatus || PlanStage::DEAD == childStatus) {
*out = id;
// If a stage fails, it may create a status WSM to indicate why it
// failed, in which case 'id' is valid. If ID is invalid, we
// create our own error message.
if (WorkingSet::INVALID_ID == id) {
mongoutils::str::stream ss;
ss << "OR stage failed to read in results from child " << _currentChild;
Status status(ErrorCodes::InternalError, ss);
*out = WorkingSetCommon::allocateStatusMember(_ws, status);
}
return childStatus;
} else if (PlanStage::NEED_YIELD == childStatus) {
*out = id;
}
// NEED_TIME, ERROR, NEED_YIELD, pass them up.
return childStatus;
}
void OrStage::doInvalidate(OperationContext* txn, const RecordId& dl, InvalidationType type) {
// TODO remove this since calling isEOF is illegal inside of doInvalidate().
if (isEOF()) {
return;
}
// If we see DL again it is not the same record as it once was so we still want to
// return it.
if (_dedup && INVALIDATION_DELETION == type) {
unordered_set<RecordId, RecordId::Hasher>::iterator it = _seen.find(dl);
if (_seen.end() != it) {
++_specificStats.recordIdsForgotten;
_seen.erase(dl);
}
}
}
unique_ptr<PlanStageStats> OrStage::getStats() {
_commonStats.isEOF = isEOF();
// Add a BSON representation of the filter to the stats tree, if there is one.
if (NULL != _filter) {
BSONObjBuilder bob;
_filter->serialize(&bob);
_commonStats.filter = bob.obj();
}
unique_ptr<PlanStageStats> ret = make_unique<PlanStageStats>(_commonStats, STAGE_OR);
ret->specific = make_unique<OrStats>(_specificStats);
for (size_t i = 0; i < _children.size(); ++i) {
ret->children.emplace_back(_children[i]->getStats());
}
return ret;
}
const SpecificStats* OrStage::getSpecificStats() const {
return &_specificStats;
}
} // namespace mongo
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