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/**
* Copyright (C) 2020-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.
*/
#pragma once
#include "mongo/db/exec/projection_executor.h"
#include "mongo/db/field_ref.h"
namespace mongo {
class IndexPathProjection {
public:
IndexPathProjection(std::unique_ptr<projection_executor::ProjectionExecutor> projExec)
: _exec(std::move(projExec)), _exhaustivePaths(_exec->extractExhaustivePaths()) {
tassert(7241740, "index path projection requires a Projection Executor", _exec);
}
projection_executor::ProjectionExecutor* exec() const {
return _exec.get();
}
const boost::optional<std::set<FieldRef>>& exhaustivePaths() const {
return _exhaustivePaths;
}
private:
// Guaranteed to be non-null.
std::unique_ptr<projection_executor::ProjectionExecutor> _exec;
// Store this here to avoid having to recompute it repeatedly, which is expensive.
boost::optional<std::set<FieldRef>> _exhaustivePaths;
};
using WildcardProjection = IndexPathProjection;
using ColumnStoreProjection = IndexPathProjection;
} // namespace mongo
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