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/**
* Copyright (C) 2018-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/ops/parsed_delete.h"
#include "mongo/db/catalog/collection.h"
#include "mongo/db/catalog/collection_operation_source.h"
#include "mongo/db/catalog/database.h"
#include "mongo/db/matcher/expression_algo.h"
#include "mongo/db/matcher/expression_parser.h"
#include "mongo/db/matcher/extensions_callback_real.h"
#include "mongo/db/ops/delete_request_gen.h"
#include "mongo/db/ops/parsed_writes_common.h"
#include "mongo/db/query/canonical_query.h"
#include "mongo/db/query/collation/collator_factory_interface.h"
#include "mongo/db/query/get_executor.h"
#include "mongo/db/query/query_planner_common.h"
#include "mongo/db/timeseries/timeseries_constants.h"
#include "mongo/db/timeseries/timeseries_gen.h"
#include "mongo/db/timeseries/timeseries_update_delete_util.h"
#include "mongo/util/assert_util.h"
#include "mongo/util/str.h"
#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kWrite
namespace mongo {
// Note: The caller should hold a lock on the 'collection' so that it can stay alive until the end
// of the ParsedDelete's lifetime.
ParsedDelete::ParsedDelete(OperationContext* opCtx,
const DeleteRequest* request,
const CollectionPtr& collection,
bool isTimeseriesDelete)
: _opCtx(opCtx),
_request(request),
_collection(collection),
_timeseriesDeleteQueryExprs(isTimeseriesDelete
? createTimeseriesWritesQueryExprsIfNecessary(
feature_flags::gTimeseriesDeletesSupport.isEnabled(
serverGlobalParams.featureCompatibility),
collection)
: nullptr) {}
Status ParsedDelete::parseRequest() {
dassert(!_canonicalQuery.get());
// It is invalid to request that the DeleteStage return the deleted document during a
// multi-remove.
invariant(!(_request->getReturnDeleted() && _request->getMulti()));
// 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->getReturnDeleted());
auto [collatorToUse, collationMatchesDefault] =
resolveCollator(_opCtx, _request->getCollation(), _collection);
_expCtx = make_intrusive<ExpressionContext>(_opCtx,
std::move(collatorToUse),
_request->getNsString(),
_request->getLegacyRuntimeConstants(),
_request->getLet());
_expCtx->collationMatchesDefault = collationMatchesDefault;
// The '_id' field of a time-series collection needs to be handled as other fields.
if (CanonicalQuery::isSimpleIdQuery(_request->getQuery()) && !_timeseriesDeleteQueryExprs) {
return Status::OK();
}
_expCtx->startExpressionCounters();
return parseQueryToCQ();
}
Status ParsedDelete::parseQueryToCQ() {
dassert(!_canonicalQuery.get());
// The projection needs to be applied after the delete operation, so we do not specify a
// projection during canonicalization.
auto findCommand = std::make_unique<FindCommandRequest>(_request->getNsString());
if (auto&& queryExprs = _timeseriesDeleteQueryExprs) {
// If we're deleting documents from a time-series collection, splits the match expression
// into a bucket-level match expression and a residual expression so that we can push down
// the bucket-level match expression to the system bucket collection SCAN or FETCH/IXSCAN.
*_timeseriesDeleteQueryExprs = timeseries::getMatchExprsForWrites(
_expCtx, *_collection->getTimeseriesOptions(), _request->getQuery());
// At this point, we parsed user-provided match expression. After this point, the new
// canonical query is internal to the bucket SCAN or FETCH/IXSCAN and will have additional
// internal match expression. We do not need to track the internal match expression counters
// and so we stop the counters.
_expCtx->stopExpressionCounters();
// At least, the bucket-level filter must contain the closed bucket filter.
tassert(7542400, "Bucket-level filter must not be null", queryExprs->_bucketExpr);
findCommand->setFilter(queryExprs->_bucketExpr->serialize());
} else {
findCommand->setFilter(_request->getQuery().getOwned());
}
findCommand->setSort(_request->getSort().getOwned());
findCommand->setCollation(_request->getCollation().getOwned());
findCommand->setHint(_request->getHint());
// 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.
if (!_request->getMulti() && !_request->getSort().isEmpty()) {
// TODO: Due to the complexity which is related to the efficient sort support, we don't
// support yet findAndModify with a query and sort but it should not be impossible.
// This code assumes that in findAndModify code path, the parsed delete constructor should
// be called with isTimeseriesDelete = true for a time-series collection.
uassert(ErrorCodes::InvalidOptions,
"Cannot perform a findAndModify with a query and sort on a time-series collection.",
!_timeseriesDeleteQueryExprs);
findCommand->setLimit(1);
}
// If the delete request has runtime constants or let parameters attached to it, pass them to
// the FindCommandRequest.
if (auto& runtimeConstants = _request->getLegacyRuntimeConstants())
findCommand->setLegacyRuntimeConstants(*runtimeConstants);
if (auto& letParams = _request->getLet())
findCommand->setLet(*letParams);
auto statusWithCQ =
CanonicalQuery::canonicalize(_opCtx,
std::move(findCommand),
_request->getIsExplain(),
_expCtx,
ExtensionsCallbackReal(_opCtx, &_request->getNsString()),
MatchExpressionParser::kAllowAllSpecialFeatures);
if (statusWithCQ.isOK()) {
_canonicalQuery = std::move(statusWithCQ.getValue());
}
return statusWithCQ.getStatus();
}
const DeleteRequest* ParsedDelete::getRequest() const {
return _request;
}
PlanYieldPolicy::YieldPolicy ParsedDelete::yieldPolicy() const {
return _request->getGod() ? PlanYieldPolicy::YieldPolicy::NO_YIELD : _request->getYieldPolicy();
}
bool ParsedDelete::hasParsedQuery() const {
return _canonicalQuery.get() != nullptr;
}
std::unique_ptr<CanonicalQuery> ParsedDelete::releaseParsedQuery() {
invariant(_canonicalQuery.get() != nullptr);
return std::move(_canonicalQuery);
}
bool ParsedDelete::isEligibleForArbitraryTimeseriesDelete() const {
return _timeseriesDeleteQueryExprs && (getResidualExpr() || !_request->getMulti());
}
} // namespace mongo
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