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/**
* Copyright (C) 2023-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/bson/bsonobj.h"
#include "mongo/db/pipeline/expression_context.h"
#include "mongo/db/query/parsed_find_command.h"
#include "mongo/db/query/query_shape/query_shape.h"
#include "mongo/db/query/query_shape/serialization_options.h"
namespace mongo::query_shape {
/**
* This struct is bit of a weird one. We want to use it as the shape's _entire_ "specific
* components" (rather than introduce more virtual functions to that interface). So, we track here
* the let component (as the name suggests) but we also keep an unowned reference to the specific
* components of CmdWithLetShape sub-classes. This class doesn't really do all that much with those
* components except track a reference to them and ensure their size is accounted for and their hash
* value is incorporated.
*/
struct LetShapeComponent : public CmdSpecificShapeComponents {
LetShapeComponent(boost::optional<BSONObj> let,
const boost::intrusive_ptr<ExpressionContext>& expCtx,
const CmdSpecificShapeComponents& unownedInnerComponents);
/**
* Hashes to include the shapified let parameters and also the hash of 'unownedInnerComponents'.
*/
void HashValue(absl::HashState state) const final;
/**
* Includes the size of the let parameters and the size of 'unownedInnerComponents.'
*/
size_t size() const final;
/**
* Adds _only_ the let params.
*/
void addLetBson(BSONObjBuilder&,
const SerializationOptions&,
const boost::intrusive_ptr<ExpressionContext>&) const;
BSONObj shapifiedLet;
bool hasLet;
// Tracked so that this can be hash combined correctly.
const CmdSpecificShapeComponents& unownedInnerComponents;
};
/**
* The 'let' command argument is semi-generic in that it is supported in a couple commands. However
* it is treated specially since it supports using expressions as the let constants. Using
* expressions induces a library dependency that we don't want in the Shape interface itself. So
* this class handles tracking and adding the 'let' component of the shape for sub-classes.
*/
class CmdWithLetShape : public Shape {
public:
CmdWithLetShape(boost::optional<BSONObj> let,
const boost::intrusive_ptr<ExpressionContext>& expCtx,
const CmdSpecificShapeComponents& unownedInnerComponents,
NamespaceStringOrUUID,
BSONObj collation_);
const CmdSpecificShapeComponents& specificComponents() const final {
return _let;
}
protected:
void appendCmdSpecificShapeComponents(BSONObjBuilder&,
OperationContext* opCtx,
const SerializationOptions& opts) const final;
virtual void appendLetCmdSpecificShapeComponents(
BSONObjBuilder&,
const boost::intrusive_ptr<ExpressionContext>& expCtx,
const SerializationOptions&) const = 0;
LetShapeComponent _let;
};
static_assert(sizeof(CmdWithLetShape) == sizeof(Shape) + sizeof(LetShapeComponent),
"If the class' members have changed, this assert and the extraSize() calculation may "
"need to be updated with a new value.");
} // namespace mongo::query_shape
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