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// index_descriptor.cpp
/**
* Copyright (C) 2014 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.
*/
#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kIndex
#include "mongo/platform/basic.h"
#include "mongo/db/catalog/collection.h"
#include "mongo/db/catalog/index_catalog.h"
#include "mongo/db/index/index_descriptor.h"
#include <algorithm>
#include "mongo/bson/simple_bsonelement_comparator.h"
#include "mongo/util/log.h"
namespace mongo {
using IndexVersion = IndexDescriptor::IndexVersion;
namespace {
void populateOptionsMap(std::map<StringData, BSONElement>& theMap, const BSONObj& spec) {
BSONObjIterator it(spec);
while (it.more()) {
const BSONElement e = it.next();
StringData fieldName = e.fieldNameStringData();
if (fieldName == IndexDescriptor::kKeyPatternFieldName ||
fieldName == IndexDescriptor::kNamespaceFieldName ||
fieldName == IndexDescriptor::kIndexNameFieldName ||
fieldName ==
IndexDescriptor::kIndexVersionFieldName || // not considered for equivalence
fieldName == IndexDescriptor::kTextVersionFieldName || // same as index version
fieldName == IndexDescriptor::k2dsphereVersionFieldName || // same as index version
fieldName ==
IndexDescriptor::kBackgroundFieldName || // this is a creation time option only
fieldName == IndexDescriptor::kDropDuplicatesFieldName || // this is now ignored
fieldName == IndexDescriptor::kSparseFieldName || // checked specially
fieldName == IndexDescriptor::kUniqueFieldName // check specially
) {
continue;
}
theMap[fieldName] = e;
}
}
} // namespace
constexpr StringData IndexDescriptor::k2dIndexBitsFieldName;
constexpr StringData IndexDescriptor::k2dIndexMaxFieldName;
constexpr StringData IndexDescriptor::k2dIndexMinFieldName;
constexpr StringData IndexDescriptor::k2dsphereCoarsestIndexedLevel;
constexpr StringData IndexDescriptor::k2dsphereFinestIndexedLevel;
constexpr StringData IndexDescriptor::k2dsphereVersionFieldName;
constexpr StringData IndexDescriptor::kBackgroundFieldName;
constexpr StringData IndexDescriptor::kCollationFieldName;
constexpr StringData IndexDescriptor::kDefaultLanguageFieldName;
constexpr StringData IndexDescriptor::kDropDuplicatesFieldName;
constexpr StringData IndexDescriptor::kExpireAfterSecondsFieldName;
constexpr StringData IndexDescriptor::kGeoHaystackBucketSize;
constexpr StringData IndexDescriptor::kIndexNameFieldName;
constexpr StringData IndexDescriptor::kIndexVersionFieldName;
constexpr StringData IndexDescriptor::kKeyPatternFieldName;
constexpr StringData IndexDescriptor::kLanguageOverrideFieldName;
constexpr StringData IndexDescriptor::kNamespaceFieldName;
constexpr StringData IndexDescriptor::kPartialFilterExprFieldName;
constexpr StringData IndexDescriptor::kSparseFieldName;
constexpr StringData IndexDescriptor::kStorageEngineFieldName;
constexpr StringData IndexDescriptor::kTextVersionFieldName;
constexpr StringData IndexDescriptor::kUniqueFieldName;
constexpr StringData IndexDescriptor::kWeightsFieldName;
bool IndexDescriptor::isIndexVersionSupported(IndexVersion indexVersion) {
switch (indexVersion) {
case IndexVersion::kV0:
case IndexVersion::kV1:
case IndexVersion::kV2:
return true;
}
return false;
}
std::set<IndexVersion> IndexDescriptor::getSupportedIndexVersions() {
return {IndexVersion::kV0, IndexVersion::kV1, IndexVersion::kV2};
}
Status IndexDescriptor::isIndexVersionAllowedForCreation(
IndexVersion indexVersion,
const ServerGlobalParams::FeatureCompatibility& featureCompatibility,
const BSONObj& indexSpec) {
switch (indexVersion) {
case IndexVersion::kV0:
break;
case IndexVersion::kV1:
case IndexVersion::kV2:
return Status::OK();
}
return {ErrorCodes::CannotCreateIndex,
str::stream() << "Invalid index specification " << indexSpec
<< "; cannot create an index with v="
<< static_cast<int>(indexVersion)};
}
IndexVersion IndexDescriptor::getDefaultIndexVersion() {
return IndexVersion::kV2;
}
bool IndexDescriptor::isMultikey(OperationContext* opCtx) const {
return _collection->getIndexCatalog()->isMultikey(opCtx, this);
}
MultikeyPaths IndexDescriptor::getMultikeyPaths(OperationContext* opCtx) const {
return _collection->getIndexCatalog()->getMultikeyPaths(opCtx, this);
}
const IndexCatalog* IndexDescriptor::getIndexCatalog() const {
return _collection->getIndexCatalog();
}
bool IndexDescriptor::areIndexOptionsEquivalent(const IndexDescriptor* other) const {
if (isSparse() != other->isSparse()) {
return false;
}
if (!isIdIndex() && unique() != other->unique()) {
// Note: { _id: 1 } or { _id: -1 } implies unique: true.
return false;
}
// Then compare the rest of the options.
std::map<StringData, BSONElement> existingOptionsMap;
populateOptionsMap(existingOptionsMap, infoObj());
std::map<StringData, BSONElement> newOptionsMap;
populateOptionsMap(newOptionsMap, other->infoObj());
return existingOptionsMap.size() == newOptionsMap.size() &&
std::equal(existingOptionsMap.begin(),
existingOptionsMap.end(),
newOptionsMap.begin(),
[](const std::pair<StringData, BSONElement>& lhs,
const std::pair<StringData, BSONElement>& rhs) {
return lhs.first == rhs.first &&
SimpleBSONElementComparator::kInstance.evaluate(lhs.second ==
rhs.second);
});
}
}
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