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/**
* Copyright (C) 2021-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* 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
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* 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 Server Side 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/query_utils.h"
#include "mongo/db/exec/sbe/match_path.h"
namespace mongo {
bool sortPatternHasPartsWithCommonPrefix(const SortPattern& sortPattern) {
StringDataSet prefixSet;
for (const auto& part : sortPattern) {
// Ignore any $meta sorts that may be present.
if (!part.fieldPath) {
continue;
}
auto [_, inserted] = prefixSet.insert(part.fieldPath->getFieldName(0));
if (!inserted) {
return true;
}
}
return false;
}
bool isIdHackEligibleQuery(const CollectionPtr& collection, const CanonicalQuery& query) {
const auto& findCommand = query.getFindCommandRequest();
return !findCommand.getShowRecordId() && findCommand.getHint().isEmpty() &&
findCommand.getMin().isEmpty() && findCommand.getMax().isEmpty() &&
!findCommand.getSkip() && CanonicalQuery::isSimpleIdQuery(findCommand.getFilter()) &&
!findCommand.getTailable() &&
CollatorInterface::collatorsMatch(query.getCollator(), collection->getDefaultCollator());
}
bool isQuerySbeCompatible(const CollectionPtr* collection, const CanonicalQuery* cq) {
tassert(6071400,
"Expected CanonicalQuery and Collection pointer to not be nullptr",
cq && collection);
auto expCtx = cq->getExpCtxRaw();
// If we don't support all expressions used or the query is eligible for IDHack, don't use SBE.
if (!expCtx || expCtx->sbeCompatibility == SbeCompatibility::notCompatible ||
(*collection && isIdHackEligibleQuery(*collection, *cq))) {
return false;
}
const auto* proj = cq->getProj();
if (proj && (proj->requiresMatchDetails() || proj->containsElemMatch())) {
return false;
}
// Queries against the oplog, a change collection, or a time-series collection are not
// supported. Also queries on the inner side of a $lookup are not considered for SBE.
const auto& nss = cq->nss();
if (expCtx->inLookup || nss.isOplog() || nss.isChangeCollection() ||
nss.isTimeseriesBucketsCollection() || !cq->metadataDeps().none()) {
return false;
}
// TODO SERVER-75715: Remove this code block once SBE support for clustered collection scans is
// fully implemented.
// (Ignore FCV check): This is intentional because we always want to use this feature once the
// feature flag is enabled.
const bool sbeFull = feature_flags::gFeatureFlagSbeFull.isEnabledAndIgnoreFCVUnsafe();
if (!sbeFull && (*collection && collection->get()->isClustered())) {
// Queries against a clustered collection are not currently supported by SBE.
return false;
}
const auto& sortPattern = cq->getSortPattern();
// If the sort has meta or numeric path components, we cannot use SBE.
return !sortPattern || std::all_of(sortPattern->begin(), sortPattern->end(), [](auto&& part) {
return part.fieldPath &&
!sbe::MatchPath(part.fieldPath->fullPath()).hasNumericPathComponents();
});
}
bool isQueryPlanSbeCompatible(const QuerySolution* root) {
tassert(7061701, "Expected QuerySolution pointer to not be nullptr", root);
// TODO SERVER-52958: Add support in the SBE stage builders for the COUNT_SCAN stage.
const bool isNotCountScan = !root->hasNode(StageType::STAGE_COUNT_SCAN);
return isNotCountScan;
}
} // namespace mongo
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