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/**
* Copyright (C) 2015 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/platform/basic.h"
#include "mongo/db/query/plan_cache_indexability.h"
#include <memory>
#include "mongo/base/init.h"
#include "mongo/base/owned_pointer_vector.h"
#include "mongo/db/query/index_entry.h"
#include "mongo/db/matcher/expression.h"
#include "mongo/db/matcher/expression_algo.h"
#include "mongo/db/matcher/expression_leaf.h"
#include "mongo/stdx/memory.h"
namespace mongo {
void PlanCacheIndexabilityState::processSparseIndex(const BSONObj& keyPattern) {
for (BSONElement elem : keyPattern) {
_pathDiscriminatorsMap[elem.fieldNameStringData()].push_back(
[] (const MatchExpression* queryExpr) {
if (queryExpr->matchType() == MatchExpression::EQ) {
const auto* queryExprEquality =
static_cast<const EqualityMatchExpression*>(queryExpr);
return !queryExprEquality->getData().isNull();
}
else if (queryExpr->matchType() == MatchExpression::MATCH_IN) {
const auto* queryExprIn =
static_cast<const InMatchExpression*>(queryExpr);
return !queryExprIn->getData().hasNull();
}
else {
return true;
}
}
);
}
}
void PlanCacheIndexabilityState::processPartialIndex(const MatchExpression* filterExpr) {
invariant(filterExpr);
for (size_t i = 0; i < filterExpr->numChildren(); ++i) {
processPartialIndex(filterExpr->getChild(i));
}
if (!filterExpr->isLogical()) {
_pathDiscriminatorsMap[filterExpr->path()].push_back(
[filterExpr] (const MatchExpression* queryExpr) {
return expression::isSubsetOf(queryExpr, filterExpr);
}
);
}
}
namespace {
const IndexabilityDiscriminators emptyDiscriminators;
} // namespace
const IndexabilityDiscriminators& PlanCacheIndexabilityState::getDiscriminators(
StringData path) const {
PathDiscriminatorsMap::const_iterator it = _pathDiscriminatorsMap.find(path);
if (it == _pathDiscriminatorsMap.end()) {
return emptyDiscriminators;
}
return it->second;
}
void PlanCacheIndexabilityState::updateDiscriminators(
const std::vector<IndexEntry>& indexEntries) {
_pathDiscriminatorsMap = PathDiscriminatorsMap();
for (const IndexEntry& idx : indexEntries) {
if (idx.sparse) {
processSparseIndex(idx.keyPattern);
}
if (idx.filterExpr) {
processPartialIndex(idx.filterExpr);
}
}
}
} // namespace mongo
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