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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/platform/basic.h"
#include "mongo/db/exec/document_value/document_metadata_fields.h"
#include "mongo/db/jsobj.h"
#include "mongo/db/pipeline/dependencies.h"
#include "mongo/db/pipeline/field_path.h"
#include "mongo/util/str.h"
namespace mongo {
BSONObj DepsTracker::toProjectionWithoutMetadata(
TruncateToRootLevel truncationBehavior /*= TruncateToRootLevel::no*/) const {
BSONObjBuilder bb;
if (needWholeDocument) {
return bb.obj();
}
if (fields.empty()) {
// We need no user-level fields (as we would if this was logically a count). Since there is
// no way of expressing a projection that indicates no depencies, we return an empty
// projection.
return bb.obj();
}
bool idSpecified = false;
std::string last;
for (const auto& field : fields) {
if (str::startsWith(field, "_id") && (field.size() == 3 || field[3] == '.')) {
idSpecified = true;
}
if (!last.empty() && str::startsWith(field, last)) {
// we are including a parent of *it so we don't need to include this field
// explicitly. This logic relies on on set iterators going in lexicographic order so
// that a string is always directly before of all fields it prefixes.
continue;
}
// Check that the field requested is a valid field name in the agg language. This
// constructor will throw if it isn't.
FieldPath fp(field);
if (truncationBehavior == TruncateToRootLevel::yes) {
last = fp.front().toString() + '.';
bb.append(fp.front(), 1);
} else {
last = field + '.';
bb.append(field, 1);
}
}
if (!idSpecified) {
bb.append("_id", 0);
}
return bb.obj();
}
void DepsTracker::setNeedsMetadata(DocumentMetadataFields::MetaType type, bool required) {
uassert(40218,
str::stream() << "query requires " << type << " metadata, but it is not available",
!required || !_unavailableMetadata[type]);
// If the metadata type is not required, then it should not be recorded as a metadata
// dependency.
invariant(required || !_metadataDeps[type]);
_metadataDeps[type] = required;
}
} // namespace mongo
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