// 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.

#include "core/data_type/data_type_jsonb.h"

#include "exprs/function/simple_function_factory.h"

namespace doris {

class FunctionToJson : public IFunction {

public:

    static constexpr auto name = "to_json";

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

    using NullMapType = PaddedPODArray<UInt8>;

    String get_name() const override { return name; }

    bool is_variadic() const override { return false; }

    size_t get_number_of_arguments() const override { return 1; }

    DataTypePtr get_return_type_impl(const DataTypes& arguments) const override {

        return std::make_shared<DataTypeJsonb>();

    }

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

                        uint32_t result, size_t input_rows_count) const override {

        auto to_column = ColumnString::create();

        auto from_type_serde = block.get_by_position(arguments[0]).type->get_serde();

        auto from_column = block.get_by_position(arguments[0]).column;

        RETURN_IF_ERROR(

                from_type_serde->serialize_column_to_jsonb_vector(*from_column, *to_column));

        block.get_by_position(result).column = std::move(to_column);

        return Status::OK();

    }

};

void register_function_to_json(SimpleFunctionFactory& factory) {

    factory.register_function<FunctionToJson>();

}

} // namespace doris