// 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.

#pragma once

#include <utility>

#include "core/data_type/data_type_agg_state.h"

#include "exprs/aggregate/aggregate_function.h"

namespace doris {

#include "common/compile_check_begin.h"

const static std::string AGG_UNION_SUFFIX = "_union";

class AggregateStateUnion : public IAggregateFunctionHelper<AggregateStateUnion> {

public:

    AggregateStateUnion(AggregateFunctionPtr function, const DataTypes& argument_types_,

                        DataTypePtr return_type)

            : IAggregateFunctionHelper(argument_types_),

              _function(std::move(function)),

              _return_type(std::move(return_type)) {}

    ~AggregateStateUnion() override = default;

    static AggregateFunctionPtr create(AggregateFunctionPtr function,

                                       const DataTypes& argument_types_,

                                       const DataTypePtr& return_type) {

        CHECK(argument_types_.size() == 1);

        if (function == nullptr) {

            return nullptr;

        }

        return std::make_shared<AggregateStateUnion>(function, argument_types_, return_type);

    }

    void set_version(const int version_) override {

        IAggregateFunctionHelper::set_version(version_);

        _function->set_version(version_);

    }

    void create(AggregateDataPtr __restrict place) const override { _function->create(place); }

    String get_name() const override { return _function->get_name() + AGG_UNION_SUFFIX; }

    DataTypePtr get_return_type() const override { return _return_type; }

    void add(AggregateDataPtr __restrict place, const IColumn** columns, ssize_t row_num,

             Arena& arena) const override {

        //the range is [begin, end]

        _function->deserialize_and_merge_from_column_range(place, *columns[0], row_num, row_num,

                                                           arena);

    }

    void add_batch_single_place(size_t batch_size, AggregateDataPtr place, const IColumn** columns,

                                Arena& arena) const override {

        _function->deserialize_and_merge_from_column_range(place, *columns[0], 0, batch_size - 1,

                                                           arena);

    }

    void add_batch(size_t batch_size, AggregateDataPtr* places, size_t place_offset,

                   const IColumn** columns, Arena& arena, bool agg_many) const override {

        for (size_t i = 0; i < batch_size; ++i) {

            //the range is [i, i]

            _function->deserialize_and_merge_from_column_range(places[i] + place_offset,

                                                               *columns[0], i, i, arena);

        }

    }

    void reset(AggregateDataPtr place) const override { _function->reset(place); }

    void merge(AggregateDataPtr __restrict place, ConstAggregateDataPtr rhs,

               Arena& arena) const override {

        _function->merge(place, rhs, arena);

    }

    void serialize(ConstAggregateDataPtr __restrict place, BufferWritable& buf) const override {

        _function->serialize(place, buf);

    }

    void deserialize(AggregateDataPtr __restrict place, BufferReadable& buf,

                     Arena& arena) const override {

        _function->deserialize(place, buf, arena);

    }

    void insert_result_into(ConstAggregateDataPtr __restrict place, IColumn& to) const override {

        _function->serialize_without_key_to_column(place, to);

    }

    void destroy(AggregateDataPtr __restrict place) const noexcept override {

        _function->destroy(place);

    }

    bool is_trivial() const override { return false; }

    size_t size_of_data() const override { return _function->size_of_data(); }

    size_t align_of_data() const override { return _function->align_of_data(); }

protected:

    AggregateFunctionPtr _function;

    DataTypePtr _return_type;

};

} // namespace doris

#include "common/compile_check_end.h"