// 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/Exprs_types.h>

#include <memory>

#include "olap/tablet_schema.h"

namespace doris {

class WrapperField;

struct ColumnMapping {

    ColumnMapping() = default;

    virtual ~ColumnMapping() = default;

    bool has_reference() const { return expr != nullptr || ref_column_idx >= 0; }

    // <0: use default value

    // >=0: use origin column

    int32_t ref_column_idx = -1;

    // normally for default value. stores values for filters

    WrapperField* default_value = nullptr;

    std::shared_ptr<TExpr> expr;

    const TabletColumn* new_column = nullptr;

};

using SchemaMapping = std::vector<ColumnMapping>;

} // namespace doris