// 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 "jni_data_bridge.h"

#include <glog/logging.h>

#include <sstream>

#include <variant>

#include "core/block/block.h"

#include "core/column/column_array.h"

#include "core/column/column_map.h"

#include "core/column/column_nullable.h"

#include "core/column/column_string.h"

#include "core/column/column_struct.h"

#include "core/column/column_varbinary.h"

#include "core/data_type/data_type_array.h"

#include "core/data_type/data_type_map.h"

#include "core/data_type/data_type_nullable.h"

#include "core/data_type/data_type_struct.h"

#include "core/data_type/data_type_varbinary.h"

#include "core/data_type/define_primitive_type.h"

#include "core/data_type/primitive_type.h"

#include "core/types.h"

#include "core/value/decimalv2_value.h"

namespace doris {

#define FOR_FIXED_LENGTH_TYPES(M)                                  \

    M(PrimitiveType::TYPE_TINYINT, ColumnInt8, Int8)               \

    M(PrimitiveType::TYPE_BOOLEAN, ColumnUInt8, UInt8)             \

    M(PrimitiveType::TYPE_SMALLINT, ColumnInt16, Int16)            \

    M(PrimitiveType::TYPE_INT, ColumnInt32, Int32)                 \

    M(PrimitiveType::TYPE_BIGINT, ColumnInt64, Int64)              \

    M(PrimitiveType::TYPE_LARGEINT, ColumnInt128, Int128)          \

    M(PrimitiveType::TYPE_FLOAT, ColumnFloat32, Float32)           \

    M(PrimitiveType::TYPE_DOUBLE, ColumnFloat64, Float64)          \

    M(PrimitiveType::TYPE_DECIMALV2, ColumnDecimal128V2, Int128)   \

    M(PrimitiveType::TYPE_DECIMAL128I, ColumnDecimal128V3, Int128) \

    M(PrimitiveType::TYPE_DECIMAL32, ColumnDecimal32, Int32)       \

    M(PrimitiveType::TYPE_DECIMAL64, ColumnDecimal64, Int64)       \

    M(PrimitiveType::TYPE_DATE, ColumnDate, Int64)                 \

    M(PrimitiveType::TYPE_DATEV2, ColumnDateV2, UInt32)            \

    M(PrimitiveType::TYPE_DATETIME, ColumnDateTime, Int64)         \

    M(PrimitiveType::TYPE_DATETIMEV2, ColumnDateTimeV2, UInt64)    \

    M(PrimitiveType::TYPE_TIMESTAMPTZ, ColumnTimeStampTz, UInt64)  \

    M(PrimitiveType::TYPE_IPV4, ColumnIPv4, IPv4)                  \

    M(PrimitiveType::TYPE_IPV6, ColumnIPv6, IPv6)

Status JniDataBridge::fill_block(Block* block, const ColumnNumbers& arguments, long table_address) {

    if (table_address == 0) {

        return Status::InternalError("table_address is 0");

    }

    TableMetaAddress table_meta(table_address);

    long num_rows = table_meta.next_meta_as_long();

    for (size_t i : arguments) {

        if (block->get_by_position(i).column.get() == nullptr) {

            auto return_type = block->get_data_type(i);

            bool result_nullable = return_type->is_nullable();

            ColumnUInt8::MutablePtr null_col = nullptr;

            if (result_nullable) {

                return_type = remove_nullable(return_type);

                null_col = ColumnUInt8::create();

            }

            auto res_col = return_type->create_column();

            if (result_nullable) {

                block->replace_by_position(

                        i, ColumnNullable::create(std::move(res_col), std::move(null_col)));

            } else {

                block->replace_by_position(i, std::move(res_col));

            }

        } else if (is_column_const(*(block->get_by_position(i).column))) {

            auto doris_column = block->get_by_position(i).column->convert_to_full_column_if_const();

            bool is_nullable = block->get_by_position(i).type->is_nullable();

            block->replace_by_position(i, is_nullable ? make_nullable(doris_column) : doris_column);

        }

        auto& column_with_type_and_name = block->get_by_position(i);

        auto& column_ptr = column_with_type_and_name.column;

        auto& column_type = column_with_type_and_name.type;

        RETURN_IF_ERROR(fill_column(table_meta, column_ptr, column_type, num_rows));

    }

    return Status::OK();

}

Status JniDataBridge::fill_column(TableMetaAddress& address, ColumnPtr& doris_column,

                                  const DataTypePtr& data_type, size_t num_rows) {

    auto logical_type = data_type->get_primitive_type();

    void* null_map_ptr = address.next_meta_as_ptr();

    if (null_map_ptr == nullptr) {

        // org.apache.doris.common.jni.vec.ColumnType.Type#UNSUPPORTED will set column address as 0

        return Status::InternalError("Unsupported type {} in java side", data_type->get_name());

    }

    auto mutable_doris_column = IColumn::mutate(std::move(doris_column));

    MutableColumnPtr data_column;

    if (auto* nullable_column = check_and_get_column<ColumnNullable>(mutable_doris_column.get())) {

        data_column = nullable_column->get_nested_column_ptr();

        NullMap& null_map = nullable_column->get_null_map_data();

        size_t origin_size = null_map.size();

        null_map.resize(origin_size + num_rows);

        memcpy(null_map.data() + origin_size, static_cast<bool*>(null_map_ptr), num_rows);

    } else {

        data_column = mutable_doris_column->get_ptr();

    }

    // Date and DateTime are deprecated and not supported.

    Status status = Status::OK();

    switch (logical_type) {

#define DISPATCH(TYPE_INDEX, COLUMN_TYPE, CPP_TYPE)                                             \

    case TYPE_INDEX: {                                                                          \

        auto* data = reinterpret_cast<CPP_TYPE*>(address.next_meta_as_ptr());                   \

        status = _fill_fixed_length_column<COLUMN_TYPE, CPP_TYPE>(data_column, data, num_rows); \

        break;                                                                                  \

    }

        FOR_FIXED_LENGTH_TYPES(DISPATCH)

#undef DISPATCH

    case PrimitiveType::TYPE_STRING:

        [[fallthrough]];

    case PrimitiveType::TYPE_CHAR:

        [[fallthrough]];

    case PrimitiveType::TYPE_VARCHAR:

        status = _fill_string_column(address, data_column, num_rows);

        break;

    case PrimitiveType::TYPE_ARRAY:

        status = _fill_array_column(address, data_column, data_type, num_rows);

        break;

    case PrimitiveType::TYPE_MAP:

        status = _fill_map_column(address, data_column, data_type, num_rows);

        break;

    case PrimitiveType::TYPE_STRUCT:

        status = _fill_struct_column(address, data_column, data_type, num_rows);

        break;

    case PrimitiveType::TYPE_VARBINARY:

        status = _fill_varbinary_column(address, data_column, num_rows);

        break;

    default:

        status = Status::InvalidArgument("Unsupported type {} in jni scanner",

                                         data_type->get_name());

        break;

    }

    doris_column = std::move(mutable_doris_column);

    return status;

}

Status JniDataBridge::_fill_varbinary_column(TableMetaAddress& address,

                                             MutableColumnPtr& doris_column, size_t num_rows) {

    auto* meta_base = reinterpret_cast<char*>(address.next_meta_as_ptr());

    auto& varbinary_col = assert_cast<ColumnVarbinary&>(*doris_column);

    // Java side writes per-row metadata as 16 bytes: [len: long][addr: long]

    for (size_t i = 0; i < num_rows; ++i) {

        // Read length (first 8 bytes)

        int64_t len = 0;

        memcpy(&len, meta_base + 16 * i, sizeof(len));

        if (len <= 0) {

            varbinary_col.insert_default();

        } else {

            // Read address (next 8 bytes)

            uint64_t addr_u = 0;

            memcpy(&addr_u, meta_base + 16 * i + 8, sizeof(addr_u));

            const char* src = reinterpret_cast<const char*>(addr_u);

            varbinary_col.insert_data(src, static_cast<size_t>(len));

        }

    }

    return Status::OK();

}

Status JniDataBridge::_fill_string_column(TableMetaAddress& address, MutableColumnPtr& doris_column,

                                          size_t num_rows) {

    auto& string_col = static_cast<ColumnString&>(*doris_column);

    ColumnString::Chars& string_chars = string_col.get_chars();

    ColumnString::Offsets& string_offsets = string_col.get_offsets();

    int* offsets = reinterpret_cast<int*>(address.next_meta_as_ptr());

    char* chars = reinterpret_cast<char*>(address.next_meta_as_ptr());

    // This judgment is necessary, otherwise the following statement `offsets[num_rows - 1]` out of bounds

    // What's more, This judgment must be placed after `address.next_meta_as_ptr()`

    // because `address.next_meta_as_ptr` will make `address._meta_index` plus 1

    if (num_rows == 0) {

        return Status::OK();

    }

    size_t origin_chars_size = string_chars.size();

    string_chars.resize(origin_chars_size + offsets[num_rows - 1]);

    memcpy(string_chars.data() + origin_chars_size, chars, offsets[num_rows - 1]);

    size_t origin_offsets_size = string_offsets.size();

    size_t start_offset = string_offsets[origin_offsets_size - 1];

    string_offsets.resize(origin_offsets_size + num_rows);

    for (size_t i = 0; i < num_rows; ++i) {

        string_offsets[origin_offsets_size + i] =

                static_cast<unsigned int>(offsets[i] + start_offset);

    }

    return Status::OK();

}

Status JniDataBridge::_fill_array_column(TableMetaAddress& address, MutableColumnPtr& doris_column,

                                         const DataTypePtr& data_type, size_t num_rows) {

    ColumnPtr& element_column = static_cast<ColumnArray&>(*doris_column).get_data_ptr();

    const DataTypePtr& element_type =

            (assert_cast<const DataTypeArray*>(remove_nullable(data_type).get()))

                    ->get_nested_type();

    ColumnArray::Offsets64& offsets_data = static_cast<ColumnArray&>(*doris_column).get_offsets();

    int64_t* offsets = reinterpret_cast<int64_t*>(address.next_meta_as_ptr());

    size_t origin_size = offsets_data.size();

    offsets_data.resize(origin_size + num_rows);

    size_t start_offset = offsets_data[origin_size - 1];

    for (size_t i = 0; i < num_rows; ++i) {

        offsets_data[origin_size + i] = offsets[i] + start_offset;

    }

    return fill_column(address, element_column, element_type,

                       offsets_data[origin_size + num_rows - 1] - start_offset);

}

Status JniDataBridge::_fill_map_column(TableMetaAddress& address, MutableColumnPtr& doris_column,

                                       const DataTypePtr& data_type, size_t num_rows) {

    auto& map = static_cast<ColumnMap&>(*doris_column);

    const DataTypePtr& key_type =

            reinterpret_cast<const DataTypeMap*>(remove_nullable(data_type).get())->get_key_type();

    const DataTypePtr& value_type =

            reinterpret_cast<const DataTypeMap*>(remove_nullable(data_type).get())

                    ->get_value_type();

    ColumnPtr& key_column = map.get_keys_ptr();

    ColumnPtr& value_column = map.get_values_ptr();

    ColumnArray::Offsets64& map_offsets = map.get_offsets();

    int64_t* offsets = reinterpret_cast<int64_t*>(address.next_meta_as_ptr());

    size_t origin_size = map_offsets.size();

    map_offsets.resize(origin_size + num_rows);

    size_t start_offset = map_offsets[origin_size - 1];

    for (size_t i = 0; i < num_rows; ++i) {

        map_offsets[origin_size + i] = offsets[i] + start_offset;

    }

    RETURN_IF_ERROR(fill_column(address, key_column, key_type,

                                map_offsets[origin_size + num_rows - 1] - start_offset));

    RETURN_IF_ERROR(fill_column(address, value_column, value_type,

                                map_offsets[origin_size + num_rows - 1] - start_offset));

    return Status::OK();

}

Status JniDataBridge::_fill_struct_column(TableMetaAddress& address, MutableColumnPtr& doris_column,

                                          const DataTypePtr& data_type, size_t num_rows) {

    auto& doris_struct = static_cast<ColumnStruct&>(*doris_column);

    const DataTypeStruct* doris_struct_type =

            reinterpret_cast<const DataTypeStruct*>(remove_nullable(data_type).get());

    for (int i = 0; i < doris_struct.tuple_size(); ++i) {

        ColumnPtr& struct_field = doris_struct.get_column_ptr(i);

        const DataTypePtr& field_type = doris_struct_type->get_element(i);

        RETURN_IF_ERROR(fill_column(address, struct_field, field_type, num_rows));

    }

    return Status::OK();

}

std::string JniDataBridge::get_jni_type(const DataTypePtr& data_type) {

    DataTypePtr type = remove_nullable(data_type);

    std::ostringstream buffer;

    switch (type->get_primitive_type()) {

    case TYPE_BOOLEAN:

        return "boolean";

    case TYPE_TINYINT:

        return "tinyint";

    case TYPE_SMALLINT:

        return "smallint";

    case TYPE_INT:

        return "int";

    case TYPE_BIGINT:

        return "bigint";

    case TYPE_LARGEINT:

        return "largeint";

    case TYPE_FLOAT:

        return "float";

    case TYPE_DOUBLE:

        return "double";

    case TYPE_IPV4:

        return "ipv4";

    case TYPE_IPV6:

        return "ipv6";

    case TYPE_VARCHAR:

        [[fallthrough]];

    case TYPE_CHAR:

        [[fallthrough]];

    case TYPE_STRING:

        return "string";

    case TYPE_DATE:

        return "datev1";

    case TYPE_DATEV2:

        return "datev2";

    case TYPE_DATETIME:

        return "datetimev1";

    case TYPE_DATETIMEV2:

        [[fallthrough]];

    case TYPE_TIMEV2: {

        buffer << "datetimev2(" << type->get_scale() << ")";

        return buffer.str();

    }

    case TYPE_TIMESTAMPTZ: {

        buffer << "timestamptz(" << type->get_scale() << ")";

        return buffer.str();

    }

    case TYPE_BINARY:

        return "binary";

    case TYPE_DECIMALV2: {

        buffer << "decimalv2(" << DecimalV2Value::PRECISION << "," << DecimalV2Value::SCALE << ")";

        return buffer.str();

    }

    case TYPE_DECIMAL32: {

        buffer << "decimal32(" << type->get_precision() << "," << type->get_scale() << ")";

        return buffer.str();

    }

    case TYPE_DECIMAL64: {

        buffer << "decimal64(" << type->get_precision() << "," << type->get_scale() << ")";

        return buffer.str();

    }

    case TYPE_DECIMAL128I: {

        buffer << "decimal128(" << type->get_precision() << "," << type->get_scale() << ")";

        return buffer.str();

    }

    case TYPE_STRUCT: {

        const DataTypeStruct* struct_type = reinterpret_cast<const DataTypeStruct*>(type.get());

        buffer << "struct<";

        for (int i = 0; i < struct_type->get_elements().size(); ++i) {

            if (i != 0) {

                buffer << ",";

            }

            buffer << struct_type->get_element_names()[i] << ":"

                   << get_jni_type(struct_type->get_element(i));

        }

        buffer << ">";

        return buffer.str();

    }

    case TYPE_ARRAY: {

        const DataTypeArray* array_type = reinterpret_cast<const DataTypeArray*>(type.get());

        buffer << "array<" << get_jni_type(array_type->get_nested_type()) << ">";

        return buffer.str();

    }

    case TYPE_MAP: {

        const DataTypeMap* map_type = reinterpret_cast<const DataTypeMap*>(type.get());

        buffer << "map<" << get_jni_type(map_type->get_key_type()) << ","

               << get_jni_type(map_type->get_value_type()) << ">";

        return buffer.str();

    }

    case TYPE_VARBINARY:

        return "varbinary";

    // bitmap, hll, quantile_state, jsonb are transferred as strings via JNI

    case TYPE_BITMAP:

        [[fallthrough]];

    case TYPE_HLL:

        [[fallthrough]];

    case TYPE_QUANTILE_STATE:

        [[fallthrough]];

    case TYPE_JSONB:

        return "string";

    default:

        return "unsupported";

    }

}

std::string JniDataBridge::get_jni_type_with_different_string(const DataTypePtr& data_type) {

    DataTypePtr type = remove_nullable(data_type);

    std::ostringstream buffer;

    switch (data_type->get_primitive_type()) {

    case TYPE_BOOLEAN:

        return "boolean";

    case TYPE_TINYINT:

        return "tinyint";

    case TYPE_SMALLINT:

        return "smallint";

    case TYPE_INT:

        return "int";

    case TYPE_BIGINT:

        return "bigint";

    case TYPE_LARGEINT:

        return "largeint";

    case TYPE_FLOAT:

        return "float";

    case TYPE_DOUBLE:

        return "double";

    case TYPE_IPV4:

        return "ipv4";

    case TYPE_IPV6:

        return "ipv6";

    case TYPE_VARCHAR: {

        buffer << "varchar("

               << assert_cast<const DataTypeString*>(remove_nullable(data_type).get())->len()

               << ")";

        return buffer.str();

    }

    case TYPE_DATE:

        return "datev1";

    case TYPE_DATEV2:

        return "datev2";

    case TYPE_DATETIME:

        return "datetimev1";

    case TYPE_DATETIMEV2:

        [[fallthrough]];

    case TYPE_TIMEV2: {

        buffer << "datetimev2(" << data_type->get_scale() << ")";

        return buffer.str();

    }

    case TYPE_TIMESTAMPTZ: {

        buffer << "timestamptz(" << data_type->get_scale() << ")";

        return buffer.str();

    }

    case TYPE_BINARY:

        return "binary";

    case TYPE_CHAR: {

        buffer << "char("

               << assert_cast<const DataTypeString*>(remove_nullable(data_type).get())->len()

               << ")";

        return buffer.str();

    }

    case TYPE_STRING:

        return "string";

    case TYPE_VARBINARY:

        buffer << "varbinary("

               << assert_cast<const DataTypeVarbinary*>(remove_nullable(data_type).get())->len()

               << ")";

        return buffer.str();

    case TYPE_DECIMALV2: {

        buffer << "decimalv2(" << DecimalV2Value::PRECISION << "," << DecimalV2Value::SCALE << ")";

        return buffer.str();

    }

    case TYPE_DECIMAL32: {

        buffer << "decimal32(" << data_type->get_precision() << "," << data_type->get_scale()

               << ")";

        return buffer.str();

    }

    case TYPE_DECIMAL64: {

        buffer << "decimal64(" << data_type->get_precision() << "," << data_type->get_scale()

               << ")";

        return buffer.str();

    }

    case TYPE_DECIMAL128I: {

        buffer << "decimal128(" << data_type->get_precision() << "," << data_type->get_scale()

               << ")";

        return buffer.str();

    }

    case TYPE_STRUCT: {

        const auto* type_struct =

                assert_cast<const DataTypeStruct*>(remove_nullable(data_type).get());

        buffer << "struct<";

        for (int i = 0; i < type_struct->get_elements().size(); ++i) {

            if (i != 0) {

                buffer << ",";

            }

            buffer << type_struct->get_element_name(i) << ":"

                   << get_jni_type_with_different_string(type_struct->get_element(i));

        }

        buffer << ">";

        return buffer.str();

    }

    case TYPE_ARRAY: {

        const auto* type_arr = assert_cast<const DataTypeArray*>(remove_nullable(data_type).get());

        buffer << "array<" << get_jni_type_with_different_string(type_arr->get_nested_type())

               << ">";

        return buffer.str();

    }

    case TYPE_MAP: {

        const auto* type_map = assert_cast<const DataTypeMap*>(remove_nullable(data_type).get());

        buffer << "map<" << get_jni_type_with_different_string(type_map->get_key_type()) << ","

               << get_jni_type_with_different_string(type_map->get_value_type()) << ">";

        return buffer.str();

    }

    // bitmap, hll, quantile_state, jsonb are transferred as strings via JNI

    case TYPE_BITMAP:

        [[fallthrough]];

    case TYPE_HLL:

        [[fallthrough]];

    case TYPE_QUANTILE_STATE:

        [[fallthrough]];

    case TYPE_JSONB:

        return "string";

    default:

        return "unsupported";

    }

}

Status JniDataBridge::_fill_column_meta(const ColumnPtr& doris_column, const DataTypePtr& data_type,

                                        std::vector<long>& meta_data) {

    auto logical_type = data_type->get_primitive_type();

    const IColumn* column = nullptr;

    // insert const flag

    if (is_column_const(*doris_column)) {

        meta_data.emplace_back((long)1);

        const auto& const_column = assert_cast<const ColumnConst&>(*doris_column);

        column = &(const_column.get_data_column());

    } else {

        meta_data.emplace_back((long)0);

        column = &(*doris_column);

    }

    // insert null map address

    const IColumn* data_column = nullptr;

    if (const auto* nullable_column = check_and_get_column<ColumnNullable>(column)) {

        data_column = &(nullable_column->get_nested_column());

        const auto& null_map = nullable_column->get_null_map_data();

        meta_data.emplace_back((long)null_map.data());

    } else {

        meta_data.emplace_back(0);

        data_column = column;

    }

    switch (logical_type) {

#define DISPATCH(TYPE_INDEX, COLUMN_TYPE, CPP_TYPE)                                          \

    case TYPE_INDEX: {                                                                       \

        meta_data.emplace_back(_get_fixed_length_column_address<COLUMN_TYPE>(*data_column)); \

        break;                                                                               \

    }

        FOR_FIXED_LENGTH_TYPES(DISPATCH)

#undef DISPATCH

    case PrimitiveType::TYPE_STRING:

        [[fallthrough]];

    case PrimitiveType::TYPE_CHAR:

        [[fallthrough]];

    case PrimitiveType::TYPE_VARCHAR: {

        const auto& string_column = assert_cast<const ColumnString&>(*data_column);

        // insert offsets

        meta_data.emplace_back((long)string_column.get_offsets().data());

        meta_data.emplace_back((long)string_column.get_chars().data());

        break;

    }

    case PrimitiveType::TYPE_ARRAY: {

        const auto& element_column = assert_cast<const ColumnArray&>(*data_column).get_data_ptr();

        meta_data.emplace_back(

                (long)assert_cast<const ColumnArray&>(*data_column).get_offsets().data());

        const auto& element_type =

                (assert_cast<const DataTypeArray*>(remove_nullable(data_type).get()))

                        ->get_nested_type();

        RETURN_IF_ERROR(_fill_column_meta(element_column, element_type, meta_data));

        break;

    }

    case PrimitiveType::TYPE_STRUCT: {

        const auto& doris_struct = assert_cast<const ColumnStruct&>(*data_column);

        const auto* doris_struct_type =

                assert_cast<const DataTypeStruct*>(remove_nullable(data_type).get());

        for (int i = 0; i < doris_struct.tuple_size(); ++i) {

            const auto& struct_field = doris_struct.get_column_ptr(i);

            const auto& field_type = doris_struct_type->get_element(i);

            RETURN_IF_ERROR(_fill_column_meta(struct_field, field_type, meta_data));

        }

        break;

    }

    case PrimitiveType::TYPE_MAP: {

        const auto& map = assert_cast<const ColumnMap&>(*data_column);

        const auto& key_type =

                assert_cast<const DataTypeMap*>(remove_nullable(data_type).get())->get_key_type();

        const auto& value_type =

                assert_cast<const DataTypeMap*>(remove_nullable(data_type).get())->get_value_type();

        const auto& key_column = map.get_keys_ptr();

        const auto& value_column = map.get_values_ptr();

        meta_data.emplace_back((long)map.get_offsets().data());

        RETURN_IF_ERROR(_fill_column_meta(key_column, key_type, meta_data));

        RETURN_IF_ERROR(_fill_column_meta(value_column, value_type, meta_data));

        break;

    }

    case PrimitiveType::TYPE_VARBINARY: {

        const auto& varbinary_col = assert_cast<const ColumnVarbinary&>(*data_column);

        meta_data.emplace_back((long)varbinary_col.get_data().data());

        break;

    }

    default:

        return Status::InternalError("Unsupported type: {}", data_type->get_name());

    }

    return Status::OK();

}

Status JniDataBridge::to_java_table(Block* block, std::unique_ptr<long[]>& meta) {

    ColumnNumbers arguments;

    for (size_t i = 0; i < block->columns(); ++i) {

        arguments.emplace_back(i);

    }

    return to_java_table(block, block->rows(), arguments, meta);

}

Status JniDataBridge::to_java_table(Block* block, size_t num_rows, const ColumnNumbers& arguments,

                                    std::unique_ptr<long[]>& meta) {

    std::vector<long> meta_data;

    // insert number of rows

    meta_data.emplace_back(num_rows);

    for (size_t i : arguments) {

        auto& column_with_type_and_name = block->get_by_position(i);

        RETURN_IF_ERROR(_fill_column_meta(column_with_type_and_name.column,

                                          column_with_type_and_name.type, meta_data));

    }

    meta.reset(new long[meta_data.size()]);

    memcpy(meta.get(), &meta_data[0], meta_data.size() * 8);

    return Status::OK();

}

std::pair<std::string, std::string> JniDataBridge::parse_table_schema(

        Block* block, const ColumnNumbers& arguments, bool ignore_column_name) {

    // prepare table schema

    std::ostringstream required_fields;

    std::ostringstream columns_types;

    for (int i = 0; i < arguments.size(); ++i) {

        std::string type = JniDataBridge::get_jni_type(block->get_by_position(arguments[i]).type);

        if (i == 0) {

            if (ignore_column_name) {

                required_fields << "_col_" << arguments[i];

            } else {

                required_fields << block->get_by_position(arguments[i]).name;

            }

            columns_types << type;

        } else {

            if (ignore_column_name) {

                required_fields << ","

                                << "_col_" << arguments[i];

            } else {

                required_fields << "," << block->get_by_position(arguments[i]).name;

            }

            columns_types << "#" << type;

        }

    }

    return std::make_pair(required_fields.str(), columns_types.str());

}

std::pair<std::string, std::string> JniDataBridge::parse_table_schema(Block* block) {

    ColumnNumbers arguments;

    for (size_t i = 0; i < block->columns(); ++i) {

        arguments.emplace_back(i);

    }

    return parse_table_schema(block, arguments, true);

}

} // namespace doris