// 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.

#include <glog/logging.h>

#include <stddef.h>

#include <memory>

#include <ostream>

#include <string>

#include <utility>

#include "common/status.h"

#include "core/assert_cast.h"

#include "core/block/block.h"

#include "core/block/column_numbers.h"

#include "core/block/column_with_type_and_name.h"

#include "core/column/column.h"

#include "core/column/column_array.h"

#include "core/column/column_nullable.h"

#include "core/column/column_vector.h"

#include "core/data_type/data_type.h"

#include "core/types.h"

#include "exprs/aggregate/aggregate_function.h"

#include "exprs/function/function.h"

#include "exprs/function/simple_function_factory.h"

namespace doris {

class FunctionContext;

} // namespace doris

namespace doris {

// array_exists([1, 2, 3, 0]) -> [1, 1, 1, 0]

class FunctionArrayExists : public IFunction {

public:

    static constexpr auto name = "array_exists";

    static FunctionPtr create() { return std::make_shared<FunctionArrayExists>(); }

    String get_name() const override { return name; }

    size_t get_number_of_arguments() const override { return 1; }

    DataTypePtr get_return_type_impl(const DataTypes& arguments) const override {

        DCHECK(arguments[0]->get_primitive_type() == TYPE_ARRAY)

                << "first argument for function: " << name << " should be DataTypeArray"

                << " and arguments[0] is " << arguments[0]->get_name();

        return arguments[0];

    }

    Status execute_impl(FunctionContext* context, Block& block, const ColumnNumbers& arguments,

                        uint32_t result, size_t input_rows_count) const override {

        // 1. get first array column

        const auto first_column =

                block.get_by_position(arguments[0]).column->convert_to_full_column_if_const();

        const ColumnArray& first_col_array = assert_cast<const ColumnArray&>(*first_column);

        const auto& first_off_data = assert_cast<const ColumnArray::ColumnOffsets&>(

                first_col_array.get_offsets_column());

        const auto& nested_nullable_column =

                assert_cast<const ColumnNullable&>(*first_col_array.get_data_ptr());

        const auto nested_column = nested_nullable_column.get_nested_column_ptr();

        const size_t nested_column_size = nested_column->size();

        MutableColumnPtr result_null_map =

                nested_nullable_column.get_null_map_column_ptr()->clone_resized(nested_column_size);

        // 2. compute result

        MutableColumnPtr result_column = ColumnUInt8::create(nested_column_size, 0);

        auto* __restrict result_column_data =

                assert_cast<ColumnUInt8&>(*result_column).get_data().data();

        MutableColumnPtr result_offset_column = first_off_data.clone_resized(first_off_data.size());

        const auto* __restrict nested_column_data =

                assert_cast<const ColumnUInt8&>(*nested_column).get_data().data();

        for (size_t row = 0; row < nested_column_size; ++row) {

            result_column_data[row] = nested_column_data[row] != 0;

        }

        ColumnPtr result_nullalble_column =

                ColumnNullable::create(std::move(result_column), std::move(result_null_map));

        ColumnPtr column_array =

                ColumnArray::create(result_nullalble_column, std::move(result_offset_column));

        block.replace_by_position(result, column_array);

        return Status::OK();

    }

};

void register_function_array_exists(SimpleFunctionFactory& factory) {

    factory.register_function<FunctionArrayExists>();

}

} // namespace doris