zclllyybb commented on code in PR #47307: URL: https://github.com/apache/doris/pull/47307#discussion_r1929542886
########## be/src/vec/functions/function_compress.cpp: ########## @@ -0,0 +1,242 @@ +// 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 <cctype> +#include <cstddef> +#include <cstring> +#include <functional> +#include <memory> +#include <string> +#include <utility> + +#include "common/status.h" +#include "util/block_compression.h" +#include "util/faststring.h" +#include "vec/aggregate_functions/aggregate_function.h" +#include "vec/columns/column.h" +#include "vec/columns/column_nullable.h" +#include "vec/columns/column_string.h" +#include "vec/columns/column_vector.h" +#include "vec/columns/columns_number.h" +#include "vec/common/assert_cast.h" +#include "vec/core/block.h" +#include "vec/core/column_numbers.h" +#include "vec/core/column_with_type_and_name.h" +#include "vec/core/types.h" +#include "vec/data_types/data_type.h" +#include "vec/data_types/data_type_nullable.h" +#include "vec/data_types/data_type_number.h" +#include "vec/data_types/data_type_string.h" +#include "vec/functions/function.h" +#include "vec/functions/simple_function_factory.h" + +namespace doris { +class FunctionContext; +} // namespace doris + +namespace doris::vectorized { + +class FunctionCompress : public IFunction { + string hex_itoc = "0123456789ABCDEF"; + +public: + static constexpr auto name = "compress"; + static FunctionPtr create() { return std::make_shared<FunctionCompress>(); } + + 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 { + return std::make_shared<DataTypeString>(); + } + + Status execute_impl(FunctionContext* context, Block& block, const ColumnNumbers& arguments, + uint32_t result, size_t input_rows_count) const override { + // Get the compression algorithm object + BlockCompressionCodec* compression_codec; + RETURN_IF_ERROR(get_block_compression_codec(segment_v2::CompressionTypePB::ZLIB, + &compression_codec)); + + const auto& arg_column = + assert_cast<const ColumnString&>(*block.get_by_position(arguments[0]).column); + auto result_column = ColumnString::create(); + + auto& arg_data = arg_column.get_chars(); + auto& arg_offset = arg_column.get_offsets(); + const char* arg_begin = reinterpret_cast<const char*>(arg_data.data()); + + auto& col_data = result_column->get_chars(); + auto& col_offset = result_column->get_offsets(); + col_offset.resize(input_rows_count); + + faststring compressed_str; + Slice data; + for (size_t row = 0; row < input_rows_count; row++) { + size_t length = arg_offset[row] - arg_offset[row - 1]; + data = Slice(arg_begin, length); + + // Z_MEM_ERROR and Z_BUF_ERROR are already handled in compress, making sure st is always Z_OK + auto st = compression_codec->compress(data, &compressed_str); + + size_t idx = col_data.size(); + if (!length) { // data is '' + col_data.resize(col_data.size() + 2); + col_data[idx] = '0', col_data[idx + 1] = 'x'; + col_offset[row] = col_offset[row - 1] + 2; + continue; + } + + // first ten digits represent the length of the uncompressed string + col_data.resize(col_data.size() + 10); + col_data[idx] = '0', col_data[idx + 1] = 'x'; + for (size_t i = 0; i < 4; i++) { + unsigned char byte = (length >> (i * 8)) & 0xFF; + col_data[idx + 2 + i * 2] = hex_itoc[byte >> 4]; // higher four + col_data[idx + 3 + i * 2] = hex_itoc[byte & 0x0F]; + } + idx += 10; + + col_data.resize(col_data.size() + 2 * compressed_str.size()); + + unsigned char* src = compressed_str.data(); + for (size_t i = 0; i < compressed_str.size(); i++) { + col_data[idx] = hex_itoc[(*src >> 4) & 0x0F]; + col_data[idx + 1] = hex_itoc[(*src & 0x0F)]; + idx += 2; + src++; + } + col_offset[row] = col_offset[row - 1] + 10 + compressed_str.size() * 2; + } + + block.replace_by_position(result, std::move(result_column)); + return Status::OK(); + } +}; + +class FunctionUncompress : public IFunction { + string hexadecimal = "0123456789ABCDEF"; + std::map<char, int> hex_ctoi = { + {'0', 0}, {'1', 1}, {'2', 2}, {'3', 3}, {'4', 4}, {'5', 5}, {'6', 6}, {'7', 7}, + {'8', 8}, {'9', 9}, {'A', 10}, {'B', 11}, {'C', 12}, {'D', 13}, {'E', 14}, {'F', 15}, + {'a', 10}, {'b', 11}, {'c', 12}, {'d', 13}, {'e', 14}, {'f', 15}}; + +public: + static constexpr auto name = "uncompress"; + static FunctionPtr create() { return std::make_shared<FunctionUncompress>(); } + + 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 { + return make_nullable(std::make_shared<DataTypeString>()); + } + + Status execute_impl(FunctionContext* context, Block& block, const ColumnNumbers& arguments, + uint32_t result, size_t input_rows_count) const override { + // Get the compression algorithm object + BlockCompressionCodec* compression_codec; + RETURN_IF_ERROR(get_block_compression_codec(segment_v2::CompressionTypePB::ZLIB, + &compression_codec)); + + const auto& arg_column = + assert_cast<const ColumnString&>(*block.get_by_position(arguments[0]).column); + + auto& arg_data = arg_column.get_chars(); + auto& arg_offset = arg_column.get_offsets(); + const char* arg_begin = reinterpret_cast<const char*>(arg_data.data()); + + auto result_column = ColumnString::create(); + auto& col_data = result_column->get_chars(); + auto& col_offset = result_column->get_offsets(); + col_offset.resize(input_rows_count); + + auto null_column = ColumnUInt8::create(input_rows_count); + auto& null_map = null_column->get_data(); + + std::string uncompressed; + Slice data; + Slice uncompressed_slice; + for (size_t row = 0; row < input_rows_count; row++) { + null_map[row] = false; + data = Slice(arg_begin, arg_offset[row] - arg_offset[row - 1]); + size_t data_length = arg_offset[row] - arg_offset[row - 1]; + + bool illegal = false; + // The first ten digits are "0x" and length, followed by hexadecimal, each two digits is a byte + if (data_length < 10 || data_length % 2 == 1) { + illegal = true; + } else { + if (data[0] != '0' || data[1] != 'x') { + illegal = true; + } + for (size_t i = 2; i <= 9; i += 2) { + if (!std::isxdigit(data[i])) { + illegal = true; + } + } + } + + if (illegal) { // The top ten don't fit the rules + col_offset[row] = col_offset[row - 1]; + null_map[row] = true; + continue; + } + + unsigned int length = 0; + for (size_t i = 2; i <= 9; i += 2) { + unsigned char byte = (hex_ctoi.at(data[i]) << 4) + hex_ctoi.at(data[i + 1]); + length += (byte << (8 * (i / 2 - 1))); //Little Endian : 0x01000000 -> 1 + } + + uncompressed.resize(length); + uncompressed_slice = Slice(uncompressed); + + //Converts a hexadecimal readable string to a compressed byte stream + std::string s(((int)data.size - 10) / 2, ' '); // byte stream data.size >= 10 + for (size_t i = 10, j = 0; i < data.size; i += 2, j++) { + s[j] = (hex_ctoi.at(data[i]) << 4) + hex_ctoi.at(data[i + 1]); Review Comment: ditto -- This is an automated message from the Apache Git Service. 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