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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.
*/
#pragma once
#include <memory>
#include <string>
#include "mongo/base/status_with.h"
#include "mongo/db/query/canonical_query.h"
namespace mongo {
class BSONObj;
class ExtensionsCallback;
class NamespaceString;
class OperationContext;
/**
* The parsed form of the distinct command request.
*/
class ParsedDistinct {
public:
static const char kKeyField[];
static const char kQueryField[];
static const char kCollationField[];
static const char kCommentField[];
ParsedDistinct(std::unique_ptr<CanonicalQuery> query, const std::string key)
: _query(std::move(query)), _key(std::move(key)) {}
const CanonicalQuery* getQuery() const {
return _query.get();
}
/**
* Releases ownership of the canonical query to the caller.
*/
std::unique_ptr<CanonicalQuery> releaseQuery() {
invariant(_query.get());
return std::move(_query);
}
const std::string& getKey() const {
return _key;
}
/**
* Convert this ParsedDistinct into an aggregation command object.
*/
StatusWith<BSONObj> asAggregationCommand() const;
/**
* 'extensionsCallback' allows for additional mongod parsing. If called from mongos, an
* ExtensionsCallbackNoop object should be passed to skip this parsing.
*/
static StatusWith<ParsedDistinct> parse(OperationContext* opCtx,
const NamespaceString& nss,
const BSONObj& cmdObj,
const ExtensionsCallback& extensionsCallback,
bool isExplain);
private:
std::unique_ptr<CanonicalQuery> _query;
// The field for which we are getting distinct values.
const std::string _key;
};
} // namespace mongo
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