// Licensed to the Apache Software Foundation (ASF) under one

// or more contributor license agreements.  See the NOTICE file

// distributed with this work for additional information

// regarding copyright ownership.  The ASF licenses this file

// to you under the Apache License, Version 2.0 (the

// "License"); you may not use this file except in compliance

// with the License.  You may obtain a copy of the License at

//

//   http://www.apache.org/licenses/LICENSE-2.0

//

// Unless required by applicable law or agreed to in writing,

// software distributed under the License is distributed on an

// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY

// KIND, either express or implied.  See the License for the

// specific language governing permissions and limitations

// under the License.

// This file is copied from

// https://github.com/ClickHouse/ClickHouse/blob/master/src/AggregateFunctions/Combinators/AggregateFunctionForEach.cpp

// and modified by Doris

#include "exprs/aggregate/aggregate_function_foreach.h"

#include <memory>

#include "core/data_type/data_type_array.h"

#include "core/data_type/data_type_nullable.h"

#include "exprs/aggregate/aggregate_function.h"

#include "exprs/aggregate/aggregate_function_simple_factory.h"

#include "exprs/aggregate/helpers.h"

namespace doris {

#include "common/compile_check_begin.h"

void register_aggregate_function_combinator_foreach(AggregateFunctionSimpleFactory& factory) {

    AggregateFunctionCreator creator =

            [&](const std::string& name, const DataTypes& types, const DataTypePtr& result_type,

                const bool result_is_nullable,

                const AggregateFunctionAttr& attr) -> AggregateFunctionPtr {

        const std::string& suffix = AggregateFunctionForEach::AGG_FOREACH_SUFFIX;

        DataTypes transform_arguments;

        for (const auto& t : types) {

            auto item_type =

                    assert_cast<const DataTypeArray*>(remove_nullable(t).get())->get_nested_type();

            transform_arguments.push_back((item_type));

        }

        auto result_item_type =

                assert_cast<const DataTypeArray*>(remove_nullable(result_type).get())

                        ->get_nested_type();

        auto nested_function_name = name.substr(0, name.size() - suffix.size());

        auto nested_function =

                factory.get(nested_function_name, transform_arguments, result_item_type,

                            result_is_nullable, BeExecVersionManager::get_newest_version(), attr);

        if (!nested_function) {

            throw Exception(

                    ErrorCode::INTERNAL_ERROR,

                    "The combiner did not find a foreach combiner function. nested function "

                    "name {} , args {}",

                    nested_function_name, types_name(types));

        }

        return creator_without_type::create<AggregateFunctionForEach>(types, true, attr,

                                                                      nested_function);

    };

    factory.register_foreach_function_combinator(

            creator, AggregateFunctionForEach::AGG_FOREACH_SUFFIX, true);

    factory.register_foreach_function_combinator(

            creator, AggregateFunctionForEach::AGG_FOREACH_SUFFIX, false);

}

} // namespace doris