// 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 "core/column/column.h"

#include "core/column/column_array.h"

#include "core/column/column_nullable.h"

#include "core/data_type/data_type.h"

#include "core/types.h"

namespace doris {

class IColumn;

} // namespace doris

namespace doris {

#include "common/compile_check_begin.h"

struct ColumnArrayMutableData {

public:

    MutableColumnPtr array_nested_col = nullptr;

    ColumnUInt8::Container* nested_nullmap_data = nullptr;

    MutableColumnPtr offsets_col = nullptr;

    ColumnArray::Offsets64* offsets_ptr = nullptr;

    IColumn* nested_col = nullptr;

};

struct ColumnArrayExecutionData {

public:

    void reset() {

        array_nullmap_data = nullptr;

        array_col = nullptr;

        offsets_ptr = nullptr;

        nested_nullmap_data = nullptr;

        nested_col = nullptr;

    }

public:

    const UInt8* array_nullmap_data = nullptr;

    const ColumnArray* array_col = nullptr;

    const ColumnArray::Offsets64* offsets_ptr = nullptr;

    const UInt8* nested_nullmap_data = nullptr;

    ColumnPtr nested_col = nullptr;

    DataTypePtr nested_type = nullptr;

    // wrap the nested column as variant column

    bool output_as_variant = false;

    ColumnArrayMutableData to_mutable_data() const {

        ColumnArrayMutableData dst;

        dst.offsets_col = ColumnArray::ColumnOffsets::create();

        dst.offsets_ptr =

                &reinterpret_cast<ColumnArray::ColumnOffsets*>(dst.offsets_col.get())->get_data();

        dst.array_nested_col =

                ColumnNullable::create(nested_col->clone_empty(), ColumnUInt8::create());

        auto* nullable_col = reinterpret_cast<ColumnNullable*>(dst.array_nested_col.get());

        dst.nested_nullmap_data = &nullable_col->get_null_map_data();

        dst.nested_col = nullable_col->get_nested_column_ptr().get();

        for (size_t row = 0; row < offsets_ptr->size(); ++row) {

            dst.offsets_ptr->push_back((*offsets_ptr)[row]);

            size_t off = (*offsets_ptr)[row - 1];

            size_t len = (*offsets_ptr)[row] - off;

            for (size_t start = off; start < off + len; ++start) {

                if (nested_nullmap_data && nested_nullmap_data[start]) {

                    dst.nested_col->insert_default();

                    dst.nested_nullmap_data->push_back(1);

                } else {

                    dst.nested_col->insert_from(*nested_col, start);

                    dst.nested_nullmap_data->push_back(0);

                }

            }

        }

        return dst;

    }

};

bool extract_column_array_info(const IColumn& src, ColumnArrayExecutionData& data);

ColumnArrayMutableData create_mutable_data(const IColumn* nested_col, bool is_nullable);

MutableColumnPtr assemble_column_array(ColumnArrayMutableData& data);

// array[offset:length]

void slice_array(ColumnArrayMutableData& dst, ColumnArrayExecutionData& src,

                 const IColumn& offset_column, const IColumn* length_column);

using ColumnArrayExecutionDatas = std::vector<ColumnArrayExecutionData>;

#include "common/compile_check_end.h"

} // namespace doris