YQL-19748: Add ReverseBytes and ReverseBits

commit_hash:8ea4f04ae478bcbe0bb1d77cf5d6d1575bbc16f1

20 files changed, 395 insertions, 33 deletions

diff --git a/yql/essentials/udfs/common/string/string_udf.cpp b/yql/essentials/udfs/common/string/string_udf.cpp
index 34b7fdc6a53..273e7617d5b 100644
--- a/yql/essentials/udfs/common/string/string_udf.cpp
+++ b/yql/essentials/udfs/common/string/string_udf.cpp
@@ -25,32 +25,50 @@
 #include <util/string/subst.h>
 #include <util/string/util.h>
 #include <util/string/vector.h>
+#include <util/generic/bitops.h>
+
+#include <bit>
 
 using namespace NKikimr;
 using namespace NUdf;
 
 namespace {
 
-#define STRING_UDF(udfName, function)                                                    \
-    BEGIN_SIMPLE_STRICT_ARROW_UDF(T##udfName, char*(TAutoMap<char*>)) {                 \
-        const TString input(args[0].AsStringRef());                                     \
-        const auto& result = function(input);                                           \
-        return valueBuilder->NewString(result);                                         \
-    }                                                                                   \
-                                                                                        \
-    struct T##udfName##KernelExec                                                       \
-        : public TUnaryKernelExec<T##udfName##KernelExec>                               \
-    {                                                                                   \
-        template <typename TSink>                                                       \
-        static void Process(const IValueBuilder*, TBlockItem arg1, const TSink& sink) { \
-            const TString input(arg1.AsStringRef());                                    \
-            const auto& result = function(input);                                       \
-            sink(TBlockItem(result));                                                   \
-        }                                                                               \
-    };                                                                                  \
-                                                                                        \
-    END_SIMPLE_ARROW_UDF(T##udfName, T##udfName##KernelExec::Do) \
+TString ReverseBytes(const TStringRef input) {
+    TString result;
+    result.ReserveAndResize(input.Size());
+    for (size_t i = 0; i < input.Size(); ++i) {
+        result[i] = input.Data()[input.Size() - 1 - i];
+    }
+    return result;
+}
 
+TString ReverseBits(const TStringRef input) {
+    TString result;
+    result.ReserveAndResize(input.Size());
+    for (size_t i = 0; i < input.Size(); ++i) {
+        result[i] = std::bit_cast<char>(::ReverseBits(std::bit_cast<ui8>(input.Data()[input.Size() - 1 - i])));
+    }
+    return result;
+}
+
+#define STRING_UDF(udfName, function, minVersion)                                                                  \
+    BEGIN_SIMPLE_STRICT_ARROW_UDF_OPTIONS(T##udfName, char*(TAutoMap<char*>), builder.SetMinLangVer(minVersion)) { \
+        const TString input(args[0].AsStringRef());                                                                \
+        const auto& result = function(input);                                                                      \
+        return valueBuilder->NewString(result);                                                                    \
+    }                                                                                                              \
+                                                                                                                   \
+    struct T##udfName##KernelExec: public TUnaryKernelExec<T##udfName##KernelExec> {                               \
+        template <typename TSink>                                                                                  \
+        static void Process(const IValueBuilder*, TBlockItem arg1, const TSink& sink) {                            \
+            const TString input(arg1.AsStringRef());                                                               \
+            const auto& result = function(input);                                                                  \
+            sink(TBlockItem(result));                                                                              \
+        }                                                                                                          \
+    };                                                                                                             \
+                                                                                                                   \
+    END_SIMPLE_ARROW_UDF(T##udfName, T##udfName##KernelExec::Do)
 
 // 'unsafe' udf is actually strict - it returns null on any exception
 #define STRING_UNSAFE_UDF(udfName, function)                                             \
@@ -354,19 +372,21 @@ SIMPLE_STRICT_UDF_OPTIONS(TReverse, TOptional<char*>(TOptional<char*>),
                                                                                         \
     END_SIMPLE_ARROW_UDF(T##udfName, T##udfName##KernelExec::Do)
 
-#define STRING_UDF_MAP(XX)           \
-    XX(Base32Encode, Base32Encode)   \
-    XX(Base64Encode, Base64Encode)   \
-    XX(Base64EncodeUrl, Base64EncodeUrl)   \
-    XX(EscapeC, EscapeC)             \
-    XX(UnescapeC, UnescapeC)         \
-    XX(HexEncode, HexEncode)         \
-    XX(EncodeHtml, EncodeHtmlPcdata) \
-    XX(DecodeHtml, DecodeHtmlPcdata) \
-    XX(CgiEscape, CGIEscapeRet)      \
-    XX(CgiUnescape, CGIUnescapeRet)  \
-    XX(Strip, Strip)                 \
-    XX(Collapse, Collapse)
+#define STRING_UDF_MAP(XX)                                         \
+    XX(Base32Encode, Base32Encode, NYql::UnknownLangVersion)       \
+    XX(Base64Encode, Base64Encode, NYql::UnknownLangVersion)       \
+    XX(Base64EncodeUrl, Base64EncodeUrl, NYql::UnknownLangVersion) \
+    XX(EscapeC, EscapeC, NYql::UnknownLangVersion)                 \
+    XX(UnescapeC, UnescapeC, NYql::UnknownLangVersion)             \
+    XX(HexEncode, HexEncode, NYql::UnknownLangVersion)             \
+    XX(EncodeHtml, EncodeHtmlPcdata, NYql::UnknownLangVersion)     \
+    XX(DecodeHtml, DecodeHtmlPcdata, NYql::UnknownLangVersion)     \
+    XX(CgiEscape, CGIEscapeRet, NYql::UnknownLangVersion)          \
+    XX(CgiUnescape, CGIUnescapeRet, NYql::UnknownLangVersion)      \
+    XX(Strip, Strip, NYql::UnknownLangVersion)                     \
+    XX(Collapse, Collapse, NYql::UnknownLangVersion)               \
+    XX(ReverseBytes, ReverseBytes, NYql::MakeLangVersion(2025, 2)) \
+    XX(ReverseBits, ReverseBits, NYql::MakeLangVersion(2025, 2))
 
 #define STRING_UNSAFE_UDF_MAP(XX)  \
     XX(Base32Decode, Base32Decode)         \
@@ -1011,6 +1031,6 @@ SIMPLE_STRICT_UDF_OPTIONS(TReverse, TOptional<char*>(TOptional<char*>),
         TPrec,
         TToByteList,
         TFromByteList)
-}
+    } // namespace
 
 REGISTER_MODULES(TStringModule)
diff --git a/yql/essentials/udfs/common/string/test/canondata/result.json b/yql/essentials/udfs/common/string/test/canondata/result.json
index e47e0bc7c64..aff883c405e 100644
--- a/yql/essentials/udfs/common/string/test/canondata/result.json
+++ b/yql/essentials/udfs/common/string/test/canondata/result.json
@@ -49,6 +49,16 @@
             "uri": "file://test.test_BlockReplace_/results.txt"
         }
     ],
+    "test.test[BlockReverseBits]": [
+        {
+            "uri": "file://test.test_BlockReverseBits_/results.txt"
+        }
+    ],
+    "test.test[BlockReverseBytes]": [
+        {
+            "uri": "file://test.test_BlockReverseBytes_/results.txt"
+        }
+    ],
     "test.test[BlockStreamFormat]": [
         {
             "uri": "file://test.test_BlockStreamFormat_/results.txt"
@@ -104,6 +114,26 @@
             "uri": "file://test.test_Replace_/results.txt"
         }
     ],
+    "test.test[ReverseBits]": [
+        {
+            "uri": "file://test.test_ReverseBits_/results.txt"
+        }
+    ],
+    "test.test[ReverseBits_2025_01]": [
+        {
+            "uri": "file://test.test_ReverseBits_2025_01_/extracted"
+        }
+    ],
+    "test.test[ReverseBytes]": [
+        {
+            "uri": "file://test.test_ReverseBytes_/results.txt"
+        }
+    ],
+    "test.test[ReverseBytes_2025_01]": [
+        {
+            "uri": "file://test.test_ReverseBytes_2025_01_/extracted"
+        }
+    ],
     "test.test[Reverse_2025.02]": [
         {
             "uri": "file://test.test_Reverse_2025.02_/extracted"
diff --git a/yql/essentials/udfs/common/string/test/canondata/test.test_BlockReverseBits_/results.txt b/yql/essentials/udfs/common/string/test/canondata/test.test_BlockReverseBits_/results.txt
new file mode 100644
index 00000000000..51574f08ed4
--- /dev/null
+++ b/yql/essentials/udfs/common/string/test/canondata/test.test_BlockReverseBits_/results.txt
@@ -0,0 +1,56 @@
+[
+    {
+        "Write" = [
+            {
+                "Type" = [
+                    "ListType";
+                    [
+                        "StructType";
+                        [
+                            [
+                                "key";
+                                [
+                                    "DataType";
+                                    "String"
+                                ]
+                            ];
+                            [
+                                "column1";
+                                [
+                                    "DataType";
+                                    "Bool"
+                                ]
+                            ]
+                        ]
+                    ]
+                ];
+                "Data" = [
+                    [
+                        "MixAsciiAndUnicode";
+                        %true
+                    ];
+                    [
+                        "Empty";
+                        %true
+                    ];
+                    [
+                        "Ascii";
+                        %true
+                    ];
+                    [
+                        "Unicode";
+                        %true
+                    ];
+                    [
+                        "Hex";
+                        %true
+                    ];
+                    [
+                        "SingleChar";
+                        %true
+                    ]
+                ]
+            }
+        ]
+    }
+]
\ No newline at end of file
diff --git a/yql/essentials/udfs/common/string/test/canondata/test.test_BlockReverseBytes_/results.txt b/yql/essentials/udfs/common/string/test/canondata/test.test_BlockReverseBytes_/results.txt
new file mode 100644
index 00000000000..d9750f7e437
--- /dev/null
+++ b/yql/essentials/udfs/common/string/test/canondata/test.test_BlockReverseBytes_/results.txt
@@ -0,0 +1,60 @@
+[
+    {
+        "Write" = [
+            {
+                "Type" = [
+                    "ListType";
+                    [
+                        "StructType";
+                        [
+                            [
+                                "key";
+                                [
+                                    "DataType";
+                                    "String"
+                                ]
+                            ];
+                            [
+                                "column1";
+                                [
+                                    "DataType";
+                                    "Bool"
+                                ]
+                            ]
+                        ]
+                    ]
+                ];
+                "Data" = [
+                    [
+                        "MixAsciiAndUnicode";
+                        %true
+                    ];
+                    [
+                        "Empty";
+                        %true
+                    ];
+                    [
+                        "Ascii";
+                        %true
+                    ];
+                    [
+                        "Unicode";
+                        %true
+                    ];
+                    [
+                        "Hex";
+                        %true
+                    ];
+                    [
+                        "Polindrome";
+                        %true
+                    ];
+                    [
+                        "SingleChar";
+                        %true
+                    ]
+                ]
+            }
+        ]
+    }
+]
\ No newline at end of file
diff --git a/yql/essentials/udfs/common/string/test/canondata/test.test_ReverseBits_/results.txt b/yql/essentials/udfs/common/string/test/canondata/test.test_ReverseBits_/results.txt
new file mode 100644
index 00000000000..51574f08ed4
--- /dev/null
+++ b/yql/essentials/udfs/common/string/test/canondata/test.test_ReverseBits_/results.txt
@@ -0,0 +1,56 @@
+[
+    {
+        "Write" = [
+            {
+                "Type" = [
+                    "ListType";
+                    [
+                        "StructType";
+                        [
+                            [
+                                "key";
+                                [
+                                    "DataType";
+                                    "String"
+                                ]
+                            ];
+                            [
+                                "column1";
+                                [
+                                    "DataType";
+                                    "Bool"
+                                ]
+                            ]
+                        ]
+                    ]
+                ];
+                "Data" = [
+                    [
+                        "MixAsciiAndUnicode";
+                        %true
+                    ];
+                    [
+                        "Empty";
+                        %true
+                    ];
+                    [
+                        "Ascii";
+                        %true
+                    ];
+                    [
+                        "Unicode";
+                        %true
+                    ];
+                    [
+                        "Hex";
+                        %true
+                    ];
+                    [
+                        "SingleChar";
+                        %true
+                    ]
+                ]
+            }
+        ]
+    }
+]
\ No newline at end of file
diff --git a/yql/essentials/udfs/common/string/test/canondata/test.test_ReverseBits_2025_01_/extracted b/yql/essentials/udfs/common/string/test/canondata/test.test_ReverseBits_2025_01_/extracted
new file mode 100644
index 00000000000..a783318ac04
--- /dev/null
+++ b/yql/essentials/udfs/common/string/test/canondata/test.test_ReverseBits_2025_01_/extracted
@@ -0,0 +1,11 @@
+<tmp_path>/program.sql:<main>: Error: Type annotation
+
+    <tmp_path>/program.sql:<main>:2:1: Error: At function: RemovePrefixMembers, At function: Unordered, At function: PersistableRepr, At function: OrderedSqlProject, At tuple, At function: SqlProjectItem, At lambda
+    	select 
+	^
+        <tmp_path>/program.sql:<main>:4:13: Error: At function: Apply, At function: Udf
+        	    String::ReverseBits("Simple строка long enough\xfe\xff");
+	            ^
+            <tmp_path>/program.sql:<main>:4:13: Error: UDF 'String.ReverseBits' is not available before version 2025.02
+            	    String::ReverseBits("Simple строка long enough\xfe\xff");
+	            ^
\ No newline at end of file
diff --git a/yql/essentials/udfs/common/string/test/canondata/test.test_ReverseBytes_/results.txt b/yql/essentials/udfs/common/string/test/canondata/test.test_ReverseBytes_/results.txt
new file mode 100644
index 00000000000..d9750f7e437
--- /dev/null
+++ b/yql/essentials/udfs/common/string/test/canondata/test.test_ReverseBytes_/results.txt
@@ -0,0 +1,60 @@
+[
+    {
+        "Write" = [
+            {
+                "Type" = [
+                    "ListType";
+                    [
+                        "StructType";
+                        [
+                            [
+                                "key";
+                                [
+                                    "DataType";
+                                    "String"
+                                ]
+                            ];
+                            [
+                                "column1";
+                                [
+                                    "DataType";
+                                    "Bool"
+                                ]
+                            ]
+                        ]
+                    ]
+                ];
+                "Data" = [
+                    [
+                        "MixAsciiAndUnicode";
+                        %true
+                    ];
+                    [
+                        "Empty";
+                        %true
+                    ];
+                    [
+                        "Ascii";
+                        %true
+                    ];
+                    [
+                        "Unicode";
+                        %true
+                    ];
+                    [
+                        "Hex";
+                        %true
+                    ];
+                    [
+                        "Polindrome";
+                        %true
+                    ];
+                    [
+                        "SingleChar";
+                        %true
+                    ]
+                ]
+            }
+        ]
+    }
+]
\ No newline at end of file
diff --git a/yql/essentials/udfs/common/string/test/canondata/test.test_ReverseBytes_2025_01_/extracted b/yql/essentials/udfs/common/string/test/canondata/test.test_ReverseBytes_2025_01_/extracted
new file mode 100644
index 00000000000..16b624bccb9
--- /dev/null
+++ b/yql/essentials/udfs/common/string/test/canondata/test.test_ReverseBytes_2025_01_/extracted
@@ -0,0 +1,11 @@
+<tmp_path>/program.sql:<main>: Error: Type annotation
+
+    <tmp_path>/program.sql:<main>:2:1: Error: At function: RemovePrefixMembers, At function: Unordered, At function: PersistableRepr, At function: OrderedSqlProject, At tuple, At function: SqlProjectItem, At lambda
+    	select 
+	^
+        <tmp_path>/program.sql:<main>:4:13: Error: At function: Apply, At function: Udf
+        	    String::ReverseBytes("Simple строка long enough\xfe\xff");
+	            ^
+            <tmp_path>/program.sql:<main>:4:13: Error: UDF 'String.ReverseBytes' is not available before version 2025.02
+            	    String::ReverseBytes("Simple строка long enough\xfe\xff");
+	            ^
\ No newline at end of file
diff --git a/yql/essentials/udfs/common/string/test/cases/BlockReverseBits.in b/yql/essentials/udfs/common/string/test/cases/BlockReverseBits.in
new file mode 100644
index 00000000000..a427e1c1c10
--- /dev/null
+++ b/yql/essentials/udfs/common/string/test/cases/BlockReverseBits.in
@@ -0,0 +1,6 @@
+{"key"="MixAsciiAndUnicode";"subkey"="Simple строка long enough";"value"="\x16\xe6\xae\xf6v\xa6\x04\xe6v\xf66\x04\r\x0b\x5D\x0b\x7D\x0b\x01\x8bA\x8b\x81\x8b\x04\xa66\x0e\xb6\x96\xca"};
+{"key"="Empty";"subkey"="";"value"=""};
+{"key"="Ascii";"subkey"="ABCDEFG";"value"="\xe2b\xa2\x22\xc2B\x82"};
+{"key"="Unicode";"subkey"="строка";"value"="\r\x0b\x5D\x0b\x7D\x0b\x01\x8bA\x8b\x81\x8b"};
+{"key"="Hex";"subkey"="\x00\x01\x02\x03\x04\x05\x06\x07\x11\x22\x33\x53\xac\xfe\xfc";"value"="?\x7f5\xca\xccD\x88\xe0`\xa0 \xc0@\x80\x00"};
+{"key"="SingleChar";"subkey"="A";"value"="\x82"};
diff --git a/yql/essentials/udfs/common/string/test/cases/BlockReverseBits.sql b/yql/essentials/udfs/common/string/test/cases/BlockReverseBits.sql
new file mode 100644
index 00000000000..b89064681ae
--- /dev/null
+++ b/yql/essentials/udfs/common/string/test/cases/BlockReverseBits.sql
@@ -0,0 +1,7 @@
+PRAGMA UseBlocks;
+
+SELECT
+    -- Use explicit comparasion instead of canonization to produce more human readable test input data.
+    -- Canonization of binary data produces encoded bytes.
+    key,
+    String::ReverseBits(subkey) == value FROM Input;
diff --git a/yql/essentials/udfs/common/string/test/cases/BlockReverseBytes.in b/yql/essentials/udfs/common/string/test/cases/BlockReverseBytes.in
new file mode 100644
index 00000000000..9ffc4ea3d05
--- /dev/null
+++ b/yql/essentials/udfs/common/string/test/cases/BlockReverseBytes.in
@@ -0,0 +1,7 @@
+{"key"="MixAsciiAndUnicode";"subkey"="Simple строка long enough";"value"="hguone gnol \xb0\xd0\xba\xd0\xbe\xd0\x80\xd1\x82\xd1\x81\xd1 elpmiS"};
+{"key"="Empty";"subkey"="";"value"=""};
+{"key"="Ascii";"subkey"="ABCDEFG";"value"="GFEDCBA"};
+{"key"="Unicode";"subkey"="строка";"value"="\xb0\xd0\xba\xd0\xbe\xd0\x80\xd1\x82\xd1\x81\xd1"};
+{"key"="Hex";"subkey"="\xff\xae\x00\x01\x02\x03\x04\x05\x06\x07";"value"="\x07\x06\x05\x04\x03\x02\x01\x00\xae\xff"};
+{"key"="Polindrome";"subkey"="radar";"value"="radar"};
+{"key"="SingleChar";"subkey"="A";"value"="A"};
diff --git a/yql/essentials/udfs/common/string/test/cases/BlockReverseBytes.sql b/yql/essentials/udfs/common/string/test/cases/BlockReverseBytes.sql
new file mode 100644
index 00000000000..0263ad3eec2
--- /dev/null
+++ b/yql/essentials/udfs/common/string/test/cases/BlockReverseBytes.sql
@@ -0,0 +1,7 @@
+PRAGMA UseBlocks;
+
+SELECT
+    -- Use explicit comparasion instead of canonization to produce more human readable test input data.
+    -- Canonization of binary data produces encoded bytes.
+    key,
+    String::ReverseBytes(subkey) == value FROM Input;
diff --git a/yql/essentials/udfs/common/string/test/cases/ReverseBits.in b/yql/essentials/udfs/common/string/test/cases/ReverseBits.in
new file mode 100644
index 00000000000..a427e1c1c10
--- /dev/null
+++ b/yql/essentials/udfs/common/string/test/cases/ReverseBits.in
@@ -0,0 +1,6 @@
+{"key"="MixAsciiAndUnicode";"subkey"="Simple строка long enough";"value"="\x16\xe6\xae\xf6v\xa6\x04\xe6v\xf66\x04\r\x0b\x5D\x0b\x7D\x0b\x01\x8bA\x8b\x81\x8b\x04\xa66\x0e\xb6\x96\xca"};
+{"key"="Empty";"subkey"="";"value"=""};
+{"key"="Ascii";"subkey"="ABCDEFG";"value"="\xe2b\xa2\x22\xc2B\x82"};
+{"key"="Unicode";"subkey"="строка";"value"="\r\x0b\x5D\x0b\x7D\x0b\x01\x8bA\x8b\x81\x8b"};
+{"key"="Hex";"subkey"="\x00\x01\x02\x03\x04\x05\x06\x07\x11\x22\x33\x53\xac\xfe\xfc";"value"="?\x7f5\xca\xccD\x88\xe0`\xa0 \xc0@\x80\x00"};
+{"key"="SingleChar";"subkey"="A";"value"="\x82"};
diff --git a/yql/essentials/udfs/common/string/test/cases/ReverseBits.sql b/yql/essentials/udfs/common/string/test/cases/ReverseBits.sql
new file mode 100644
index 00000000000..2b970eba8aa
--- /dev/null
+++ b/yql/essentials/udfs/common/string/test/cases/ReverseBits.sql
@@ -0,0 +1,5 @@
+SELECT
+    -- Use explicit comparasion instead of canonization to produce more human readable test input data.
+    -- Canonization of binary data produces encoded bytes.
+    key,
+    String::ReverseBits(subkey) == value FROM Input;
diff --git a/yql/essentials/udfs/common/string/test/cases/ReverseBits_2025_01.cfg b/yql/essentials/udfs/common/string/test/cases/ReverseBits_2025_01.cfg
new file mode 100644
index 00000000000..b92b7c1caef
--- /dev/null
+++ b/yql/essentials/udfs/common/string/test/cases/ReverseBits_2025_01.cfg
@@ -0,0 +1,2 @@
+xfail
+langver 2025.01
diff --git a/yql/essentials/udfs/common/string/test/cases/ReverseBits_2025_01.sql b/yql/essentials/udfs/common/string/test/cases/ReverseBits_2025_01.sql
new file mode 100644
index 00000000000..8c9a8cca58b
--- /dev/null
+++ b/yql/essentials/udfs/common/string/test/cases/ReverseBits_2025_01.sql
@@ -0,0 +1,2 @@
+select 
+    String::ReverseBits("Simple строка long enough\xfe\xff");
diff --git a/yql/essentials/udfs/common/string/test/cases/ReverseBytes.in b/yql/essentials/udfs/common/string/test/cases/ReverseBytes.in
new file mode 100644
index 00000000000..9ffc4ea3d05
--- /dev/null
+++ b/yql/essentials/udfs/common/string/test/cases/ReverseBytes.in
@@ -0,0 +1,7 @@
+{"key"="MixAsciiAndUnicode";"subkey"="Simple строка long enough";"value"="hguone gnol \xb0\xd0\xba\xd0\xbe\xd0\x80\xd1\x82\xd1\x81\xd1 elpmiS"};
+{"key"="Empty";"subkey"="";"value"=""};
+{"key"="Ascii";"subkey"="ABCDEFG";"value"="GFEDCBA"};
+{"key"="Unicode";"subkey"="строка";"value"="\xb0\xd0\xba\xd0\xbe\xd0\x80\xd1\x82\xd1\x81\xd1"};
+{"key"="Hex";"subkey"="\xff\xae\x00\x01\x02\x03\x04\x05\x06\x07";"value"="\x07\x06\x05\x04\x03\x02\x01\x00\xae\xff"};
+{"key"="Polindrome";"subkey"="radar";"value"="radar"};
+{"key"="SingleChar";"subkey"="A";"value"="A"};
diff --git a/yql/essentials/udfs/common/string/test/cases/ReverseBytes.sql b/yql/essentials/udfs/common/string/test/cases/ReverseBytes.sql
new file mode 100644
index 00000000000..81922fbaea6
--- /dev/null
+++ b/yql/essentials/udfs/common/string/test/cases/ReverseBytes.sql
@@ -0,0 +1,5 @@
+SELECT
+    -- Use explicit comparasion instead of canonization to produce more human readable test input data.
+    -- Canonization of binary data produces encoded bytes.
+    key,
+    String::ReverseBytes(subkey) == value FROM Input;
diff --git a/yql/essentials/udfs/common/string/test/cases/ReverseBytes_2025_01.cfg b/yql/essentials/udfs/common/string/test/cases/ReverseBytes_2025_01.cfg
new file mode 100644
index 00000000000..b92b7c1caef
--- /dev/null
+++ b/yql/essentials/udfs/common/string/test/cases/ReverseBytes_2025_01.cfg
@@ -0,0 +1,2 @@
+xfail
+langver 2025.01
diff --git a/yql/essentials/udfs/common/string/test/cases/ReverseBytes_2025_01.sql b/yql/essentials/udfs/common/string/test/cases/ReverseBytes_2025_01.sql
new file mode 100644
index 00000000000..55efba8c2d6
--- /dev/null
+++ b/yql/essentials/udfs/common/string/test/cases/ReverseBytes_2025_01.sql
@@ -0,0 +1,2 @@
+select 
+    String::ReverseBytes("Simple строка long enough\xfe\xff");