Merge pull request #71441 from bigo-sg/translate

translate support second arg longer than the third

docs/en/sql-reference/functions/string-replace-functions.md

@@ -253,7 +253,7 @@ SELECT format('{} {}', 'Hello', 'World')
 
 ## translate
 
-Replaces characters in the string `s` using a one-to-one character mapping defined by `from` and `to` strings. `from` and `to` must be constant ASCII strings of the same size. Non-ASCII characters in the original string are not modified.
+Replaces characters in the string `s` using a one-to-one character mapping defined by `from` and `to` strings. `from` and `to` must be constant ASCII strings. Non-ASCII characters in the original string are not modified. If the number of characters in `from` list is larger than the `to` list, non overlapping characters will be deleted from the input string.
 
 **Syntax**
 

src/Functions/translate.cpp

@@ -32,17 +32,31 @@ struct TranslateImpl
         const std::string & map_from,
         const std::string & map_to)
     {
-        if (map_from.size() != map_to.size())
-            throw Exception(ErrorCodes::BAD_ARGUMENTS, "Second and third arguments must be the same length");
-
         iota(map.data(), map.size(), UInt8(0));
 
-        for (size_t i = 0; i < map_from.size(); ++i)
+        size_t min_size = std::min(map_from.size(), map_to.size());
+
+        // Map characters from map_from to map_to for the overlapping range
+        for (size_t i = 0; i < min_size; ++i)
         {
             if (!isASCII(map_from[i]) || !isASCII(map_to[i]))
                 throw Exception(ErrorCodes::BAD_ARGUMENTS, "Second and third arguments must be ASCII strings");
+            map[static_cast<unsigned char>(map_from[i])] = static_cast<UInt8>(map_to[i]);
+        }
 
-            map[map_from[i]] = map_to[i];
+        // Handle any remaining characters in map_from by assigning a default value
+        for (size_t i = min_size; i < map_from.size(); ++i)
+        {
+            if (!isASCII(map_from[i]))
+                throw Exception(ErrorCodes::BAD_ARGUMENTS, "Second argument must be ASCII strings");
+            map[static_cast<unsigned char>(map_from[i])] = ascii_upper_bound + 1;
+        }
+
+        // Validate any extra characters in map_to to ensure they are ASCII
+        for (size_t i = min_size; i < map_to.size(); ++i)
+        {
+            if (!isASCII(map_to[i]))
+                throw Exception(ErrorCodes::BAD_ARGUMENTS, "Third argument must be ASCII strings");
         }
     }
 
@@ -59,10 +73,11 @@ struct TranslateImpl
         fillMapWithValues(map, map_from, map_to);
 
         res_data.resize(data.size());
-        res_offsets.assign(offsets);
+        res_offsets.resize(input_rows_count);
 
         UInt8 * dst = res_data.data();
 
+        UInt64 data_size = 0;
         for (UInt64 i = 0; i < input_rows_count; ++i)
         {
             const UInt8 * src = data.data() + offsets[i - 1];
@@ -70,18 +85,24 @@ struct TranslateImpl
 
             while (src < src_end)
             {
-                if (*src <= ascii_upper_bound)
-                    *dst = map[*src];
-                else
-                    *dst = *src;
+                if (*src <= ascii_upper_bound && map[*src] != ascii_upper_bound + 1)
+                {
+                    *dst++ = map[*src];
+                    ++data_size;
+                }
+                else if (*src > ascii_upper_bound)
+                {
+                    *dst++ = *src;
+                    ++data_size;
+                }
 
                 ++src;
-                ++dst;
             }
 
             /// Technically '\0' can be mapped into other character,
             ///  so we need to process '\0' delimiter separately
             *dst++ = 0;
+            res_offsets[i] = ++data_size;
         }
     }
 
@@ -92,6 +113,9 @@ struct TranslateImpl
         const std::string & map_to,
         ColumnString::Chars & res_data)
     {
+        if (map_from.size() != map_to.size())
+            throw Exception(ErrorCodes::BAD_ARGUMENTS, "Second and third arguments must be the same length");
+
         std::array<UInt8, 128> map;
         fillMapWithValues(map, map_from, map_to);
 
@@ -128,12 +152,6 @@ struct TranslateUTF8Impl
         const std::string & map_from,
         const std::string & map_to)
     {
-        auto map_from_size = UTF8::countCodePoints(reinterpret_cast<const UInt8 *>(map_from.data()), map_from.size());
-        auto map_to_size = UTF8::countCodePoints(reinterpret_cast<const UInt8 *>(map_to.data()), map_to.size());
-
-        if (map_from_size != map_to_size)
-            throw Exception(ErrorCodes::BAD_ARGUMENTS, "Second and third arguments must be the same length");
-
         iota(map_ascii.data(), map_ascii.size(), UInt32(0));
 
         const UInt8 * map_from_ptr = reinterpret_cast<const UInt8 *>(map_from.data());
@@ -141,32 +159,44 @@ struct TranslateUTF8Impl
         const UInt8 * map_to_ptr = reinterpret_cast<const UInt8 *>(map_to.data());
         const UInt8 * map_to_end = map_to_ptr + map_to.size();
 
-        while (map_from_ptr < map_from_end && map_to_ptr < map_to_end)
+        while (map_from_ptr < map_from_end)
         {
             size_t len_from = UTF8::seqLength(*map_from_ptr);
-            size_t len_to = UTF8::seqLength(*map_to_ptr);
 
             std::optional<UInt32> res_from, res_to;
 
             if (map_from_ptr + len_from <= map_from_end)
                 res_from = UTF8::convertUTF8ToCodePoint(map_from_ptr, len_from);
 
-            if (map_to_ptr + len_to <= map_to_end)
-                res_to = UTF8::convertUTF8ToCodePoint(map_to_ptr, len_to);
-
             if (!res_from)
                 throw Exception(ErrorCodes::BAD_ARGUMENTS, "Second argument must be a valid UTF-8 string");
 
-            if (!res_to)
-                throw Exception(ErrorCodes::BAD_ARGUMENTS, "Third argument must be a valid UTF-8 string");
+            if (map_to_ptr < map_to_end)
+            {
+                size_t len_to = UTF8::seqLength(*map_to_ptr);
 
-            if (*map_from_ptr <= ascii_upper_bound)
-                map_ascii[*map_from_ptr] = *res_to;
+                if (map_to_ptr + len_to <= map_to_end)
+                    res_to = UTF8::convertUTF8ToCodePoint(map_to_ptr, len_to);
+
+                if (!res_to)
+                    throw Exception(ErrorCodes::BAD_ARGUMENTS, "Third argument must be a valid UTF-8 string");
+
+                if (*map_from_ptr <= ascii_upper_bound)
+                    map_ascii[*map_from_ptr] = *res_to;
+                else
+                    map[*res_from] = *res_to;
+
+                map_to_ptr += len_to;
+            }
             else
-                map[*res_from] = *res_to;
+            {
+                if (*map_from_ptr <= ascii_upper_bound)
+                    map_ascii[*map_from_ptr] = max_uint32;
+                else
+                    map[*res_from] = max_uint32;
+            }
 
             map_from_ptr += len_from;
-            map_to_ptr += len_to;
         }
     }
 
@@ -205,6 +235,12 @@ struct TranslateUTF8Impl
 
                 if (*src <= ascii_upper_bound)
                 {
+                    if (map_ascii[*src] == max_uint32)
+                    {
+                        src += 1;
+                        continue;
+                    }
+
                     size_t dst_len = UTF8::convertCodePointToUTF8(map_ascii[*src], dst, 4);
                     assert(0 < dst_len && dst_len <= 4);
 
@@ -226,10 +262,13 @@ struct TranslateUTF8Impl
                         auto * it = map.find(*src_code_point);
                         if (it != map.end())
                         {
+                            src += src_len;
+                            if (it->getMapped() == max_uint32)
+                                continue;
+
                             size_t dst_len = UTF8::convertCodePointToUTF8(it->getMapped(), dst, 4);
                             assert(0 < dst_len && dst_len <= 4);
 
-                            src += src_len;
                             dst += dst_len;
                             data_size += dst_len;
                             continue;
@@ -270,6 +309,7 @@ struct TranslateUTF8Impl
 
 private:
     static constexpr auto ascii_upper_bound = '\x7f';
+    static constexpr auto max_uint32 = 0xffffffff;
 };
 
 

tests/queries/0_stateless/02353_translate.reference

@@ -14,3 +14,9 @@ HotelGenev
 ¿йðՅনй
 abc
 abc
+abc
+内码
+1A2BC
+1A2B3C
+ABC
+

tests/queries/0_stateless/02353_translate.sql

@@ -10,4 +10,12 @@ SELECT translate('abc', '', '');
 SELECT translateUTF8('abc', '', '');
 
 SELECT translate('abc', 'Ááéíóúôè', 'aaeiouoe'); -- { serverError BAD_ARGUMENTS }
-SELECT translateUTF8('abc', 'efg', ''); -- { serverError BAD_ARGUMENTS }
+SELECT translateUTF8('abc', 'efg', '');
+
+SELECT translateUTF8('中文内码', '中文', '');
+SELECT translate('aAbBcC', 'abc', '12');
+
+SELECT translate('aAbBcC', 'abc', '1235');
+SELECT translate('aAbBcC', 'abc', '');
+SELECT translate('abc', 'abc', '');
+SELECT translate('aAbBcC', '中文内码', '12'); -- { serverError BAD_ARGUMENTS }