Made some changes

be/src/vec/functions/function_compress.cpp

@@ -1,3 +1,253 @@
-//
-// Created by lzy on 25-1-16.
-//
+#include <glog/logging.h>
+
+#include <cctype>
+#include <cstddef>
+#include <cstring>
+#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 hexadecimal = "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 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 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();
+
+        faststring compressed_str;
+        Slice data;
+        for (size_t row = 0; row < input_rows_count; row++) {
+            null_map[row] = false;
+            const auto& str = arg_column.get_data_at(row);
+            data = Slice(str.data, str.size);
+
+            auto st = compression_codec->compress(data, &compressed_str);
+
+            if (!st.ok()) { // Failed to decompress. data is an illegal value
+                col_offset[row] = col_offset[row - 1];
+                null_map[row] = true;
+                continue;
+            }
+
+            size_t idx = col_data.size();
+            if (!str.size) { // 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
+            int value = (int)str.size;
+            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 = (value >> (i * 8)) & 0xFF;
+                col_data[idx + 2 + i * 2] = hexadecimal[byte >> 4]; // higher four
+                col_data[idx + 3 + i * 2] = hexadecimal[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] =
+                            ((*src >> 4) & 0x0F) + (((*src >> 4) & 0x0F) < 10 ? '0' : 'A' - 10);
+                    col_data[idx + 1] = (*src & 0x0F) + ((*src & 0x0F) < 10 ? '0' : 'A' - 10);
+                    idx += 2;
+                    src++;
+                }
+
+                col_offset[row] = col_offset[row - 1] + 10 + compressed_str.size() * 2;
+            }
+        }
+
+        block.replace_by_position(
+                result, ColumnNullable::create(std::move(result_column), std::move(null_column)));
+        return Status::OK();
+    }
+};
+
+class FunctionUncompress : public IFunction {
+    string hexadecimal = "0123456789ABCDEF";
+
+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 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++) {
+            auto check = [](char x) {
+                return ((x >= '0' && x <= '9') || (x >= 'a' && x <= 'f') || (x >= 'A' && x <= 'F'));
+            };
+
+            null_map[row] = false;
+            const auto& str = arg_column.get_data_at(row);
+            data = Slice(str.data, str.size);
+
+            int illegal = 0;
+            // The first ten digits are "0x" and length, followed by hexadecimal, each two digits is a byte
+            if ((int)str.size < 10 || (int)str.size % 2 == 1) {
+                illegal = 1;
+            } else {
+                if (data[0] != '0' || data[1] != 'x') {
+                    illegal = 1;
+                }
+                for (size_t i = 2; i <= 9; i += 2) {
+                    if (!check(data[i])) {
+                        illegal = 1;
+                    }
+                }
+            }
+
+            if (illegal) { // The top ten don't fit the rules
+                if ((int)data.size == 2 && data[0] == '0' && data[1] == 'x') {
+                    int idx = col_data.size();
+                    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;
+                }
+                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 =
+                        (data[i] >= '0' && data[i] <= '9') ? (data[i] - '0') : (data[i] - 'A' + 10);
+                byte = (byte << 4) + ((data[i + 1] >= '0' && data[i + 1] <= '9')
+                                              ? (data[i + 1] - '0')
+                                              : (data[i + 1] - 'A' + 10));
+                length += (byte << (8 * (i / 2 - 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] = (((data[i] >= '0' && data[i] <= '9') ? (data[i] - '0')
+                                                            : (data[i] - 'A' + 10))
+                        << 4) +
+                       ((data[i + 1] >= '0' && data[i + 1] <= '9') ? (data[i + 1] - '0')
+                                                                   : (data[i + 1] - 'A' + 10));
+            }
+            Slice compressed_data(s);
+            auto st = compression_codec->decompress(compressed_data, &uncompressed_slice);
+
+            if (!st.ok()) { // is not a legal compressed string
+                col_offset[row] = col_offset[row - 1];
+                null_map[row] = true;
+                continue;
+            }
+
+            int idx = col_data.size();
+            col_data.resize(col_data.size() + 2 * uncompressed_slice.size + 2);
+            col_offset[row] = col_offset[row - 1] + 2 * uncompressed_slice.size + 2;
+
+            col_data[idx] = '0', col_data[idx + 1] = 'x';
+            for (size_t i = 0; i < uncompressed_slice.size; i++) {
+                unsigned char byte = uncompressed_slice[i];
+                col_data[idx + 2 + i * 2] = hexadecimal[byte >> 4];
+                col_data[idx + 3 + i * 2] = hexadecimal[byte & 0x0F];
+            }
+        }
+
+        block.replace_by_position(
+                result, ColumnNullable::create(std::move(result_column), std::move(null_column)));
+        return Status::OK();
+    }
+};
+
+void register_function_compress(SimpleFunctionFactory& factory) {
+    factory.register_function<FunctionCompress>();
+    factory.register_function<FunctionUncompress>();
+}
+
+} // namespace doris::vectorized

be/src/vec/functions/simple_function_factory.h

@@ -110,6 +110,7 @@ void register_function_ip(SimpleFunctionFactory& factory);
 void register_function_multi_match(SimpleFunctionFactory& factory);
 void register_function_split_by_regexp(SimpleFunctionFactory& factory);
 void register_function_assert_true(SimpleFunctionFactory& factory);
+void register_function_compress(SimpleFunctionFactory& factory);
 void register_function_bit_test(SimpleFunctionFactory& factory);
 
 class SimpleFunctionFactory {
@@ -301,6 +302,7 @@ class SimpleFunctionFactory {
             register_function_split_by_regexp(instance);
             register_function_assert_true(instance);
             register_function_bit_test(instance);
+            register_function_compress(instance);
         });
         return instance;
     }

be/test/vec/function/function_string_test.cpp

@@ -3340,6 +3340,60 @@ TEST(function_string_test, function_rpad_test) {
             {{Null(), std::int32_t(0), Null()}, Null()},
     };
 
+    TEST(function_string_test, function_compress_uncompress_test) {
+        {
+            std::string func_name = "compress";
+            InputTypeSet input_types = {TypeIndex::String};
+
+            // Compress multiple different strings
+            DataSet data_set = {
+                {{Null()}, Null()},
+                // Example 1: Compress a regular string
+                {{std::string("Hello, world!")},
+                 "0x0D000000789CF348CDC9C9D75128CF2FCA49510400205E048A"},
+                // Example 2: Compress an empty string
+                {{std::string("")}, "0x"},
+                // Example 3: Compress a string with special characters
+                {{std::string("String with special characters! @#$%^&*()")},
+                 "0x29000000789C0B2E29CACC4B5728CF2CC950282E484DCE4CCC5148CE482C4A4C2E492D2A565
+                 4705056518D53D3D2D004003C2A0D81 "},
+                 // Example 4: Compress a string with leading and trailing spaces
+                 {{std::string("   This is a string with leading and trailing spaces   ")},
+                  "0x37000000789C15C7510A00101045D1ADDC45D9C00B3125C94CD93EEAFC1C2075731EE1B16D3
+                  68E456754951FCD426CD9F8F1A55C1DB8054B12C9 "}};
+
+                  static_cast<void>(
+                          check_function<DataTypeString, true>(func_name, input_types, data_set));
+        }
+
+        {
+            std::string func_name = "uncompress";
+            InputTypeSet input_types = {TypeIndex::String};
+
+            // Decompress multiple compressed strings
+            DataSet data_set = {
+                    {{Null()}, Null()},
+                    // Example 1: Decompress the result of compressing 'Hello, world!'
+                    {{std::string("0x0D000000789CF348CDC9C9D75128CF2FCA49510400205E048A")},
+                     "Hello, world!"},
+                    // Example 2: Decompress the result of compressing an empty string
+                    {{std::string("0x")}, ""},
+                    // Example 3: Decompress the result of compressing a string with special characters
+                    {{std::string("0x29000000789C0B2E29CACC4B5728CF2CC950282E484DCE4CCC5148CE482C4A
+                                  4C2E492D2A565
+                                  4705056518D53D3D2D004003C2A0D81")},
+                     "String with special characters! @#$%^&*()"},
+                    // Example 4: Decompress the result of compressing a string with leading and trailing spaces
+                    {{std::string("0x37000000789C15C7510A00101045D1ADDC45D9C00B3125C94CD93EEAFC1C20
+                                  75731EE1B16D3
+                                  68E456754951FCD426CD9F8F1A55C1DB8054B12C9")},
+                     "   This is a string with leading and trailing spaces   "}};
+
+            static_cast<void>(
+                    check_function<DataTypeString, true>(func_name, input_types, data_set));
+        }
+    }
+
     check_function_all_arg_comb<DataTypeString, true>(func_name, input_types, data_set);
 }
 

fe/fe-core/src/main/java/org/apache/doris/catalog/BuiltinScalarFunctions.java

@@ -479,6 +479,8 @@
 import org.apache.doris.nereids.trees.expressions.functions.scalar.YearsAdd;
 import org.apache.doris.nereids.trees.expressions.functions.scalar.YearsDiff;
 import org.apache.doris.nereids.trees.expressions.functions.scalar.YearsSub;
+import org.apache.doris.nereids.trees.expressions.functions.scalar.Compress;
+import org.apache.doris.nereids.trees.expressions.functions.scalar.Uncompress;
 
 import com.google.common.collect.ImmutableList;
 
@@ -974,7 +976,9 @@ public class BuiltinScalarFunctions implements FunctionHelper {
             scalar(YearsSub.class, "years_sub"),
             scalar(MultiMatch.class, "multi_match"),
             scalar(SessionUser.class, "session_user"),
-            scalar(LastQueryId.class, "last_query_id"));
+            scalar(LastQueryId.class, "last_query_id"),
+            scalar(Compress.class, "compress"),
+            scalar(Uncompress.class, "uncompress"));
 
     public static final BuiltinScalarFunctions INSTANCE = new BuiltinScalarFunctions();