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/**
* Copyright (C) 2022-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/document_value/document.h"
#include "mongo/db/exec/document_value/value.h"
#include "mongo/db/index/index_descriptor.h"
#include "mongo/db/pipeline/expression.h"
#include "mongo/db/pipeline/expression_context.h"
#include "mongo/db/pipeline/expression_visitor.h"
#include "mongo/db/pipeline/variables.h"
namespace mongo {
class ExpressionInternalOwningShard final
: public ExpressionFixedArity<ExpressionInternalOwningShard, 1> {
public:
static constexpr const char* const opName = "$_internalOwningShard";
ExpressionInternalOwningShard(ExpressionContext* const expCtx)
: ExpressionFixedArity<ExpressionInternalOwningShard, 1>(expCtx) {
expCtx->sbeCompatibility = SbeCompatibility::notCompatible;
}
Value evaluate(const Document& root, Variables* variables) const final;
const char* getOpName() const final {
return opName;
}
void acceptVisitor(ExpressionMutableVisitor* visitor) final {
return visitor->visit(this);
}
void acceptVisitor(ExpressionConstVisitor* visitor) const final {
return visitor->visit(this);
}
};
/**
* The expression '$_internalIndexKey' is used to generate index keys documents for the provided
* document 'doc' using the index specification 'spec'. The 'doc' field can be an arbitrary
* expression, including a field path or variable like '$$ROOT'. The 'spec' field is aligned with
* that of the 'createIndex' command and is treated as a constant expression, as if it had been
* supplied by the client as '$literal'.
*
* The expression specification is a follows:
* {
* $_internalIndexKey: {
* doc: <document | expression | field-path | variable>,
* spec: <document>
* }
* }
*
* Returns: A 'Value' which is an array of 'BSONObj' document, where each document represents the
* generated index keys object.
*
* Note that this expression does not inherit the collation from the collection. A collation must be
* explicitly provided in the index spec 'spec'.
*
* Examples:
* Case 1: The 'doc' field is a document.
* Input1:
* {
* $_internalIndexKey: {
* doc: {a: 4, b: 5},
* spec: {key: {a: 1}, name: "exampleIndex"}
* }
* }
* Output1: [{a: 4}]
*
* Case 2: The 'doc' field is '$$ROOT' and the current document been processed by the pipeline is
* '{a: 4, b: 5}'.
* Input2:
* {
* $_internalIndexKey: {
* doc: '$$ROOT',
* spec: {key: {a: 1}, name: "exampleIndex"}
* }
* }
* Output2: [{a: 4}]
*
* Case 3: The 'doc' field is an expression.
* Input3:
* {
* $_internalIndexKey: {
* doc: {$literal: {a: 4, b: 5}},
* spec: {key: {a: 1}, name: "exampleIndex"}
* }
* }
* Output3: [{a: 4}]
*/
class ExpressionInternalIndexKey final : public Expression {
public:
static constexpr const char* const opName = "$_internalIndexKey";
static boost::intrusive_ptr<Expression> parse(ExpressionContext* expCtx,
BSONElement bsonExpr,
const VariablesParseState& vps);
ExpressionInternalIndexKey(ExpressionContext* expCtx,
boost::intrusive_ptr<Expression> doc,
boost::intrusive_ptr<Expression> spec);
boost::intrusive_ptr<Expression> optimize() final;
Value serialize(SerializationOptions options) const final;
Value evaluate(const Document& root, Variables* variables) const final;
const char* getOpName() const {
return opName;
}
void acceptVisitor(ExpressionMutableVisitor* visitor) final {
return visitor->visit(this);
}
void acceptVisitor(ExpressionConstVisitor* visitor) const final {
return visitor->visit(this);
}
private:
constexpr static auto kDocField = "doc"_sd;
constexpr static auto kSpecField = "spec"_sd;
constexpr static auto kIndexSpecKeyField = "key"_sd;
boost::intrusive_ptr<Expression> _doc;
boost::intrusive_ptr<Expression> _spec;
};
} // namespace mongo
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