be/src/exprs/function/cast/function_cast_ip.cpp

// Licensed to the Apache Software Foundation (ASF) under one
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// distributed with this work for additional information
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// 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
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// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

// This translation unit is the ONLY place that includes cast_to_ip.h.
// All CastToImpl<CastMode, From, ToIpType> template instantiations are
// confined here, keeping them out of function_cast.cpp.

#include "core/data_type/data_type_ipv4.h"
#include "core/data_type/data_type_ipv6.h"
#include "exprs/function/cast/cast_base.h"
#include "exprs/function/cast/cast_to_ip.h"

namespace doris::CastWrapper {

template <typename IpType>
    requires(std::is_same_v<IpType, DataTypeIPv4> || std::is_same_v<IpType, DataTypeIPv6>)
WrapperType create_ip_wrapper(FunctionContext* context, const DataTypePtr& from_type) {
    std::shared_ptr<CastToBase> cast_to_ip;

    auto make_ip_wrapper = [&](const auto& types) -> bool {
        using Types = std::decay_t<decltype(types)>;
        using FromDataType = typename Types::LeftType;
        if constexpr (IsDataTypeNumber<FromDataType> || IsStringType<FromDataType> ||
                      IsIPType<FromDataType>) {
            if (context->enable_strict_mode()) {
                cast_to_ip = std::make_shared<
                        CastToImpl<CastModeType::StrictMode, FromDataType, IpType>>();
            } else {
                cast_to_ip = std::make_shared<
                        CastToImpl<CastModeType::NonStrictMode, FromDataType, IpType>>();
            }
            return true;
        } else {
            return false;
        }
    };

    if (!call_on_index_and_data_type<void>(from_type->get_primitive_type(), make_ip_wrapper)) {
        return create_unsupport_wrapper(
                fmt::format("CAST AS ip not supported {}", from_type->get_name()));
    }

    return [cast_to_ip](FunctionContext* context, Block& block, const ColumnNumbers& arguments,
                        uint32_t result, size_t input_rows_count,
                        const NullMap::value_type* null_map = nullptr) {
        return cast_to_ip->execute_impl(context, block, arguments, result, input_rows_count,
                                        null_map);
    };
}

WrapperType create_ip_wrapper(FunctionContext* context, const DataTypePtr& from_type,
                              PrimitiveType to_type) {
    switch (to_type) {
    case TYPE_IPV4:
        return create_ip_wrapper<DataTypeIPv4>(context, from_type);
    case TYPE_IPV6:
        return create_ip_wrapper<DataTypeIPv6>(context, from_type);
    default:
        return create_unsupport_wrapper(
                fmt::format("CAST AS ip: unsupported to_type {}", type_to_string(to_type)));
    }
}

} // namespace doris::CastWrapper