// 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/Functions/FunctionConst.h

// and modified by Doris

#pragma once

#include "core/column/column_const.h"

#include "core/data_type/data_type_number.h"

#include "exprs/function/function.h"

namespace doris {

template <typename Impl, bool use_field = true>

class FunctionConst : public IFunction {

public:

    static constexpr auto name = Impl::name;

    static FunctionPtr create() { return std::make_shared<FunctionConst>(); }

public:

    String get_name() const override { return name; }

    size_t get_number_of_arguments() const override { return 0; }

    DataTypePtr get_return_type_impl(const DataTypes& /*arguments*/) const override {

        return Impl::get_return_type();

    }

    Status execute_impl(FunctionContext* context, Block& block, const ColumnNumbers& arguments,

                        uint32_t result, size_t input_rows_count) const override {

        block.get_by_position(result).column =

                block.get_by_position(result).type->create_column_const(input_rows_count,

                                                                        Impl::init_value());

        return Status::OK();

    }

};

template <typename Impl>

class FunctionConst<Impl, false> : public IFunction {

public:

    static constexpr auto name = Impl::name;

    static FunctionPtr create() { return std::make_shared<FunctionConst>(); }

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    static FunctionPtr create() { return std::make_shared<FunctionConst>(); }

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    static FunctionPtr create() { return std::make_shared<FunctionConst>(); }

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    static FunctionPtr create() { return std::make_shared<FunctionConst>(); }

    String get_name() const override { return name; }

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    String get_name() const override { return name; }

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    String get_name() const override { return name; }

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    String get_name() const override { return name; }

    size_t get_number_of_arguments() const override { return 0; }

Unexecuted instantiation: _ZNK5doris13FunctionConstINS_11BitmapEmptyELb0EE23get_number_of_argumentsEv

Unexecuted instantiation: _ZNK5doris13FunctionConstINS_12HLLEmptyImplELb0EE23get_number_of_argumentsEv

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    DataTypePtr get_return_type_impl(const DataTypes& /*arguments*/) const override {

        return Impl::get_return_type();

    }

Unexecuted instantiation: _ZNK5doris13FunctionConstINS_11BitmapEmptyELb0EE20get_return_type_implERKSt6vectorISt10shared_ptrIKNS_9IDataTypeEESaIS7_EE

Unexecuted instantiation: _ZNK5doris13FunctionConstINS_12HLLEmptyImplELb0EE20get_return_type_implERKSt6vectorISt10shared_ptrIKNS_9IDataTypeEESaIS7_EE

Unexecuted instantiation: _ZNK5doris13FunctionConstINS_18QuantileStateEmptyELb0EE20get_return_type_implERKSt6vectorISt10shared_ptrIKNS_9IDataTypeEESaIS7_EE

    Status execute_impl(FunctionContext* context, Block& block, const ColumnNumbers& arguments,

                        uint32_t result, size_t input_rows_count) const override {

        auto column = Impl::ReturnColVec::create();

        column->get_data().emplace_back(Impl::init_value());

        block.replace_by_position(result, ColumnConst::create(std::move(column), input_rows_count));

        return Status::OK();

    }

Unexecuted instantiation: _ZNK5doris13FunctionConstINS_11BitmapEmptyELb0EE12execute_implEPNS_15FunctionContextERNS_5BlockERKSt6vectorIjSaIjEEjm

Unexecuted instantiation: _ZNK5doris13FunctionConstINS_12HLLEmptyImplELb0EE12execute_implEPNS_15FunctionContextERNS_5BlockERKSt6vectorIjSaIjEEjm

Unexecuted instantiation: _ZNK5doris13FunctionConstINS_18QuantileStateEmptyELb0EE12execute_implEPNS_15FunctionContextERNS_5BlockERKSt6vectorIjSaIjEEjm

};

template <typename Impl>

class FunctionMathConstFloat64 : public IFunction {

public:

    static constexpr auto name = Impl::name;

    static FunctionPtr create() { return std::make_shared<FunctionMathConstFloat64>(); }

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    static FunctionPtr create() { return std::make_shared<FunctionMathConstFloat64>(); }

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    static FunctionPtr create() { return std::make_shared<FunctionMathConstFloat64>(); }

private:

    String get_name() const override { return name; }

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    String get_name() const override { return name; }

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    String get_name() const override { return name; }

    size_t get_number_of_arguments() const override { return 0; }

Unexecuted instantiation: _ZNK5doris24FunctionMathConstFloat64INS_5EImplEE23get_number_of_argumentsEv

Unexecuted instantiation: _ZNK5doris24FunctionMathConstFloat64INS_6PiImplEE23get_number_of_argumentsEv

    DataTypePtr get_return_type_impl(const DataTypes& /*arguments*/) const override {

        return std::make_shared<DataTypeFloat64>();

    }

Unexecuted instantiation: _ZNK5doris24FunctionMathConstFloat64INS_5EImplEE20get_return_type_implERKSt6vectorISt10shared_ptrIKNS_9IDataTypeEESaIS7_EE

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    Status execute_impl(FunctionContext* context, Block& block, const ColumnNumbers& arguments,

                        uint32_t result, size_t input_rows_count) const override {

        block.get_by_position(result).column =

                block.get_by_position(result).type->create_column_const(

                        input_rows_count, Field::create_field<TYPE_DOUBLE>(Impl::value));

        return Status::OK();

    }

Unexecuted instantiation: _ZNK5doris24FunctionMathConstFloat64INS_5EImplEE12execute_implEPNS_15FunctionContextERNS_5BlockERKSt6vectorIjSaIjEEjm

Unexecuted instantiation: _ZNK5doris24FunctionMathConstFloat64INS_6PiImplEE12execute_implEPNS_15FunctionContextERNS_5BlockERKSt6vectorIjSaIjEEjm

};

} // namespace doris