// 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 <cstddef>

#include "common/status.h"

#include "core/column/column_map.h"

#include "core/data_type/data_type.h"

#include "exprs/table_function/table_function.h"

namespace doris {

#include "common/compile_check_begin.h"

class Block;

struct ColumnMapExecutionData {

public:

    void reset() {

        map_nullmap_data = nullptr;

        map_col = nullptr;

        offsets_ptr = nullptr;

    }

    const UInt8* map_nullmap_data = nullptr;

    const ColumnMap* map_col = nullptr;

    const ColumnArray::Offsets64* offsets_ptr = nullptr;

};

class VExplodeMapTableFunction : public TableFunction {

    ENABLE_FACTORY_CREATOR(VExplodeMapTableFunction);

public:

    VExplodeMapTableFunction();

    ~VExplodeMapTableFunction() override = default;

    Status process_init(Block* block, RuntimeState* state) override;

    void process_row(size_t row_idx) override;

    void process_close() override;

    void get_same_many_values(MutableColumnPtr& column, int length) override;

    int get_value(MutableColumnPtr& column, int max_step) override;

private:

    ColumnPtr _collection_column;

    ColumnMapExecutionData _map_detail;

    size_t _collection_offset; // start offset of array[row_idx]

};

#include "common/compile_check_end.h"

} // namespace doris