be/src/exprs/table_function/table_function_factory.h

// 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 <gen_cpp/Types_types.h>

#include <functional>
#include <memory>
#include <string>
#include <unordered_map>

#include "common/status.h"

namespace doris {
#include "common/compile_check_begin.h"

class ObjectPool;

class TableFunction;

class TableFunctionFactory {
public:
    TableFunctionFactory() = delete;
    static Status get_fn(const TFunction& t_fn, ObjectPool* pool, TableFunction** fn,
                         int be_version);

    const static std::unordered_map<std::string, std::function<std::unique_ptr<TableFunction>()>>
            _function_map;

    /// @TEMPORARY: for be_exec_version=8. replace function to old version.
    const static std::unordered_map<std::string, std::string> _function_to_replace;
    const static int NEWEST_VERSION_EXPLODE_MULTI_PARAM = 8;

private:
    /// @TEMPORARY: for be_exec_version=8
    static void temporary_function_update(int fe_version_now, std::string& name) {
        // replace if fe is old version.
        if (fe_version_now < NEWEST_VERSION_EXPLODE_MULTI_PARAM &&
            _function_to_replace.find(name) != _function_to_replace.end()) {
            name = _function_to_replace.at(name);
        }
    }
};
#include "common/compile_check_end.h"
} // namespace doris