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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.
*/
#include "mongo/db/query/interval_evaluation_tree.h"
#include "mongo/db/matcher/expression_internal_expr_comparison.h"
#include "mongo/db/query/index_bounds_builder.h"
namespace mongo {
namespace {
class IetPrinter {
public:
static constexpr char kOpen = '(';
static constexpr char kClose = ')';
IetPrinter(std::ostream& os) : _os{os} {}
void operator()(const IET&, const UnionInterval& node) {
_os << kOpen << "union ";
node.get<0>().visit(*this);
_os << ' ';
node.get<1>().visit(*this);
_os << kClose;
}
void operator()(const IET&, const IntersectInterval& node) {
_os << kOpen << "intersect ";
node.get<0>().visit(*this);
_os << ' ';
node.get<1>().visit(*this);
_os << kClose;
}
void operator()(const IET&, const ConstInterval& node) {
_os << kOpen << "const";
for (auto&& interval : node.intervals) {
_os << ' ' << interval.toString(false);
}
_os << kClose;
}
void operator()(const IET&, const EvalInterval& node) {
_os << kOpen << "eval " << matchTypeToString(node.matchType()) << " #"
<< node.inputParamId() << kClose;
}
void operator()(const IET&, const ComplementInterval& node) {
_os << kOpen << "not ";
node.get<0>().visit(*this);
_os << kClose;
}
private:
static std::string matchTypeToString(const MatchExpression::MatchType& matchType) {
switch (matchType) {
case MatchExpression::EQ:
return "$eq";
case MatchExpression::LTE:
return "$lte";
case MatchExpression::LT:
return "$lt";
case MatchExpression::GTE:
return "$gte";
case MatchExpression::GT:
return "$gt";
case MatchExpression::MATCH_IN:
return "$in";
case MatchExpression::REGEX:
return "$regex";
default:
tasserted(6334800, str::stream() << "unexpected MatchType" << matchType);
}
}
std::ostream& _os;
};
template <typename T, typename... Args>
inline auto makeInterval(Args&&... args) {
return IET::make<T>(std::forward<Args>(args)...);
}
template <typename T, typename = std::enable_if_t<std::is_convertible_v<T*, PathMatchExpression*>>>
auto extractInputParamId(const MatchExpression* expr) {
return checked_cast<const T*>(expr)->getInputParamId();
}
} // namespace
std::string ietToString(const IET& iet) {
std::ostringstream oss;
IetPrinter printer{oss};
iet.visit(printer);
return oss.str();
}
std::string ietsToString(const IndexEntry& index, const std::vector<IET>& iets) {
tassert(6334801,
"IET vector must have the same number of elements as the key pattern",
index.keyPattern.nFields() == static_cast<int>(iets.size()));
std::ostringstream oss;
IetPrinter printer{oss};
oss << IetPrinter::kOpen << "iets " << index.keyPattern;
BSONObjIterator it(index.keyPattern);
for (const auto& iet : iets) {
oss << ' ' << IetPrinter::kOpen << it.next() << ' ';
iet.visit(printer);
oss << IetPrinter::kClose;
}
oss << IetPrinter::kClose;
return oss.str();
}
void IETBuilder::intersectIntervals() {
tassert(6334802, "Intersection requires two index intervals", _intervals.size() >= 2);
auto rhs = std::move(_intervals.top());
_intervals.pop();
auto lhs = std::move(_intervals.top());
_intervals.pop();
_intervals.push(makeInterval<IntersectInterval>(std::move(lhs), std::move(rhs)));
}
void IETBuilder::unionIntervals() {
tassert(6334803, "Union requires two index intervals", _intervals.size() >= 2);
auto rhs = std::move(_intervals.top());
_intervals.pop();
auto lhs = std::move(_intervals.top());
_intervals.pop();
_intervals.push(makeInterval<UnionInterval>(std::move(lhs), std::move(rhs)));
}
void IETBuilder::complementInterval() {
tassert(6334804, "Not requires at least one index interval", _intervals.size() >= 1);
auto child = std::move(_intervals.top());
_intervals.pop();
_intervals.push(makeInterval<ComplementInterval>(std::move(child)));
}
void IETBuilder::translate(const MatchExpression& expr, const OrderedIntervalList& oil) {
tassert(6334805, "OrderedIntervalList must be non empty", !oil.intervals.empty());
auto [inputParamId, shouldAppendConstInterval] =
[&expr]() -> std::pair<boost::optional<MatchExpression::InputParamId>, bool> {
if (ComparisonMatchExpression::isComparisonMatchExpression(&expr)) {
return {extractInputParamId<ComparisonMatchExpression>(&expr), true};
}
switch (expr.matchType()) {
case MatchExpression::MATCH_IN:
return {extractInputParamId<InMatchExpression>(&expr), true};
case MatchExpression::EXISTS:
case MatchExpression::MOD:
return {boost::none, true};
case MatchExpression::ELEM_MATCH_VALUE:
case MatchExpression::NOT:
return {boost::none, false};
case MatchExpression::REGEX: {
const auto* regexExpr = checked_cast<const RegexMatchExpression*>(&expr);
const auto inputParamId = regexExpr->getSourceRegexInputParamId();
tassert(6334810, "RegexMatchExpression must be parameterized", inputParamId);
return {inputParamId, false};
}
default:
tasserted(6334811,
str::stream()
<< "Got unexpected expression to translate: " << expr.matchType());
};
}();
if (inputParamId) {
_intervals.push(makeInterval<EvalInterval>(*inputParamId, expr.matchType()));
} else if (shouldAppendConstInterval) {
_intervals.push(makeInterval<ConstInterval>(oil.intervals));
}
}
void IETBuilder::appendIntervalList(const OrderedIntervalList& oil) {
_intervals.push(makeInterval<ConstInterval>(oil.intervals));
}
boost::optional<IET> IETBuilder::done() const {
if (_intervals.empty()) {
return boost::none;
}
tassert(6334812, "All intervals should be merged into one", _intervals.size() == 1);
return _intervals.top();
}
} // namespace mongo
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