Implement initcap/concat functions

src/function/base_lower_upper_operation.cpp

@@ -39,22 +39,27 @@ uint32_t BaseLowerUpperFunction::getResultLen(char* inputStr, uint32_t inputLen,
     return outputLength;
 }
 
+uint64_t BaseLowerUpperFunction::convertCharCase(
+    char* result, const char* input, int32_t charPos, bool toUpper) {
+    if (input[charPos] & 0x80) {
+        int size = 0u, newSize = 0u;
+        auto codepoint = utf8proc_codepoint(input + charPos, size);
+        KU_ASSERT(codepoint >= 0); // Validity ensured by getResultLen.
+        int convertedCodepoint =
+            toUpper ? utf8proc_toupper(codepoint) : utf8proc_tolower(codepoint);
+        utf8proc_codepoint_to_utf8(convertedCodepoint, newSize, result);
+        return size;
+    } else {
+        *result = toUpper ? toupper(input[charPos]) : tolower(input[charPos]);
+        return 1;
+    }
+}
+
 void BaseLowerUpperFunction::convertCase(char* result, uint32_t len, char* input, bool toUpper) {
     for (auto i = 0u; i < len;) {
-        if (input[i] & 0x80) {
-            int size = 0, newSize = 0;
-            int codepoint = utf8proc_codepoint(input + i, size);
-            KU_ASSERT(codepoint >= 0); // Validity ensured by getResultLen.
-            int convertedCodepoint =
-                toUpper ? utf8proc_toupper(codepoint) : utf8proc_tolower(codepoint);
-            utf8proc_codepoint_to_utf8(convertedCodepoint, newSize, result);
-            result += newSize;
-            i += size;
-        } else {
-            *result = toUpper ? toupper(input[i]) : tolower(input[i]);
-            i++;
-            result++;
-        }
+        auto charWidth = convertCharCase(result, input, i, toUpper);
+        i += charWidth;
+        result += charWidth;
     }
 }
 

src/function/function_collection.cpp

@@ -74,6 +74,7 @@ FunctionCollection* FunctionCollection::getFunctions() {
         SCALAR_FUNCTION(RegexpFullMatchFunction), SCALAR_FUNCTION(RegexpMatchesFunction),
         SCALAR_FUNCTION(RegexpReplaceFunction), SCALAR_FUNCTION(RegexpExtractFunction),
         SCALAR_FUNCTION(RegexpExtractAllFunction), SCALAR_FUNCTION(LevenshteinFunction),
+        SCALAR_FUNCTION(InitcapFunction),
 
         // Array Functions
         SCALAR_FUNCTION(ArrayValueFunction), SCALAR_FUNCTION(ArrayCrossProductFunction),

src/function/vector_arithmetic_functions.cpp

@@ -15,7 +15,7 @@
 #include "function/list/functions/list_concat_function.h"
 #include "function/list/vector_list_functions.h"
 #include "function/scalar_function.h"
-#include "function/string/functions/concat_function.h"
+#include "function/string/vector_string_functions.h"
 
 using namespace kuzu::common;
 
@@ -155,8 +155,7 @@ function_set AddFunction::getFunctionSet() {
     // string + string -> string
     result.push_back(std::make_unique<ScalarFunction>(name,
         std::vector<LogicalTypeID>{LogicalTypeID::STRING, LogicalTypeID::STRING},
-        LogicalTypeID::STRING,
-        ScalarFunction::BinaryStringExecFunction<ku_string_t, ku_string_t, ku_string_t, Concat>));
+        LogicalTypeID::STRING, ConcatFunction::execFunc));
     // interval + interval → interval
     result.push_back(getBinaryFunction<Add, interval_t, interval_t>(
         name, LogicalTypeID::INTERVAL, LogicalTypeID::INTERVAL));

src/function/vector_string_functions.cpp

@@ -1,9 +1,9 @@
 #include "function/string/vector_string_functions.h"
 
 #include "function/string/functions/array_extract_function.h"
-#include "function/string/functions/concat_function.h"
 #include "function/string/functions/contains_function.h"
 #include "function/string/functions/ends_with_function.h"
+#include "function/string/functions/initcap_function.h"
 #include "function/string/functions/left_operation.h"
 #include "function/string/functions/levenshtein_function.h"
 #include "function/string/functions/lpad_function.h"
@@ -52,22 +52,6 @@
     }
 }
 
-void Concat::concat(const char* left, uint32_t leftLen, const char* right, uint32_t rightLen,
-    ku_string_t& result, ValueVector& resultValueVector) {
-    auto len = leftLen + rightLen;
-    if (len <= ku_string_t::SHORT_STR_LENGTH /* concat result is short */) {
-        memcpy(result.prefix, left, leftLen);
-        memcpy(result.prefix + leftLen, right, rightLen);
-    } else {
-        StringVector::reserveString(&resultValueVector, result, len);
-        auto buffer = reinterpret_cast<char*>(result.overflowPtr);
-        memcpy(buffer, left, leftLen);
-        memcpy(buffer + leftLen, right, rightLen);
-        memcpy(result.prefix, buffer, ku_string_t::PREFIX_LENGTH);
-    }
-    result.len = len;
-}
-
 void Repeat::operation(
     ku_string_t& left, int64_t& right, ku_string_t& result, ValueVector& resultValueVector) {
     result.len = left.len * right;
@@ -121,13 +105,45 @@
     return functionSet;
 }
 
+void ConcatFunction::execFunc(const std::vector<std::shared_ptr<ValueVector>>& parameters,
+    ValueVector& result, void* /*dataPtr*/) {
+    result.resetAuxiliaryBuffer();
+    for (auto selectedPos = 0u; selectedPos < result.state->selVector->selectedSize;
+         ++selectedPos) {
+        auto pos = result.state->selVector->selectedPositions[selectedPos];
+        auto strLen = 0u;
+        for (auto i = 0u; i < parameters.size(); i++) {
+            const auto& parameter = parameters[i];
+            auto paramPos = parameter->state->isFlat() ?
+                                parameter->state->selVector->selectedPositions[0] :
+                                pos;
+            strLen += parameter->getValue<ku_string_t>(paramPos).len;
+        }
+        auto& resultStr = result.getValue<ku_string_t>(pos);
+        StringVector::reserveString(&result, resultStr, strLen);
+        auto dstData = strLen <= ku_string_t::SHORT_STR_LENGTH ?
+                           resultStr.prefix :
+                           reinterpret_cast<uint8_t*>(resultStr.overflowPtr);
+        for (auto i = 0u; i < parameters.size(); i++) {
+            const auto& parameter = parameters[i];
+            auto paramPos = parameter->state->isFlat() ?
+                                parameter->state->selVector->selectedPositions[0] :
+                                pos;
+            auto srcStr = parameter->getValue<ku_string_t>(paramPos);
+            memcpy(dstData, srcStr.getData(), srcStr.len);
+            dstData += srcStr.len;
+        }
+        if (strLen > ku_string_t::SHORT_STR_LENGTH) {
+            memcpy(resultStr.prefix, resultStr.getData(), ku_string_t::PREFIX_LENGTH);
+        }
+    }
+}
+
 function_set ConcatFunction::getFunctionSet() {
     function_set functionSet;
-    functionSet.emplace_back(make_unique<ScalarFunction>(name,
-        std::vector<LogicalTypeID>{LogicalTypeID::STRING, LogicalTypeID::STRING},
-        LogicalTypeID::STRING,
-        ScalarFunction::BinaryStringExecFunction<ku_string_t, ku_string_t, ku_string_t, Concat>,
-        false /* isVarLength */));
+    functionSet.emplace_back(
+        make_unique<ScalarFunction>(name, std::vector<LogicalTypeID>{LogicalTypeID::STRING},
+            LogicalTypeID::STRING, execFunc, true /* isVarLength */));
     return functionSet;
 }
 
@@ -317,5 +333,14 @@
     return functionSet;
 }
 
+function_set InitcapFunction::getFunctionSet() {
+    function_set functionSet;
+    functionSet.emplace_back(make_unique<ScalarFunction>(name,
+        std::vector<LogicalTypeID>{LogicalTypeID::STRING}, LogicalTypeID::STRING,
+        ScalarFunction::UnaryStringExecFunction<ku_string_t, ku_string_t, Initcap>, nullptr,
+        nullptr, false /* isVarLength */));
+    return functionSet;
+}
+
 } // namespace function
 } // namespace kuzu

src/include/common/types/ku_string.h

@@ -31,6 +31,10 @@ struct KUZU_API ku_string_t {
         return isShortString(len) ? prefix : reinterpret_cast<uint8_t*>(overflowPtr);
     }
 
+    uint8_t* getDataUnsafe() {
+        return isShortString(len) ? prefix : reinterpret_cast<uint8_t*>(overflowPtr);
+    }
+
     // These functions do *NOT* allocate/resize the overflow buffer, it only copies the content and
     // set the length.
     void set(const std::string& value);

src/include/function/string/functions/base_lower_upper_function.h

@@ -12,6 +12,8 @@ struct BaseLowerUpperFunction {
     KUZU_API static void operation(common::ku_string_t& input, common::ku_string_t& result,
         common::ValueVector& resultValueVector, bool isUpper);
 
+    static uint64_t convertCharCase(char* result, const char* input, int32_t charPos, bool toUpper);
+
 private:
     static uint32_t getResultLen(char* inputStr, uint32_t inputLen, bool isUpper);
     static void convertCase(char* result, uint32_t len, char* input, bool toUpper);

src/include/function/string/functions/initcap_function.h

@@ -0,0 +1,19 @@
+#pragma once
+
+#include "base_lower_upper_function.h"
+#include "lower_function.h"
+
+namespace kuzu {
+namespace function {
+
+struct Initcap {
+    static void operation(common::ku_string_t& operand, common::ku_string_t& result,
+        common::ValueVector& resultVector) {
+        Lower::operation(operand, result, resultVector);
+        BaseLowerUpperFunction::convertCharCase(reinterpret_cast<char*>(result.getDataUnsafe()),
+            reinterpret_cast<const char*>(result.getData()), 0 /* charPos */, true /* toUpper */);
+    }
+};
+
+} // namespace function
+} // namespace kuzu

src/include/function/string/vector_string_functions.h

@@ -34,6 +34,9 @@ struct ArrayExtractFunction {
 struct ConcatFunction : public VectorStringFunction {
     static constexpr const char* name = "CONCAT";
 
+    static void execFunc(const std::vector<std::shared_ptr<common::ValueVector>>& parameters,
+        common::ValueVector& result, void* /*dataPtr*/);
+
     static function_set getFunctionSet();
 };
 
@@ -175,5 +178,11 @@ struct LevenshteinFunction : public VectorStringFunction {
     static function_set getFunctionSet();
 };
 
+struct InitcapFunction : public VectorStringFunction {
+    static constexpr const char* name = "INITCAP";
+
+    static function_set getFunctionSet();
+};
+
 } // namespace function
 } // namespace kuzu

test/main/udf_test.cpp

@@ -1,4 +1,3 @@
-#include "function/string/functions/concat_function.h"
 #include "main_test_helper/main_test_helper.h"
 
 using namespace kuzu::common;
@@ -294,14 +293,29 @@ TEST_F(ApiTest, vectorizedBinaryAddDate) {
     sortAndCheckTestResults(actualResult, expectedResult);
 }
 
+static void concat(const ku_string_t& left, const ku_string_t& right, ku_string_t& result,
+    ValueVector& resultValueVector) {
+    result.len = left.len + right.len;
+    if (result.len <= ku_string_t::SHORT_STR_LENGTH /* concat result is short */) {
+        memcpy(result.prefix, left.getData(), left.len);
+        memcpy(result.prefix + left.len, right.getData(), right.len);
+    } else {
+        StringVector::reserveString(&resultValueVector, result, result.len);
+        auto buffer = reinterpret_cast<char*>(result.overflowPtr);
+        memcpy(buffer, left.getData(), left.len);
+        memcpy(buffer + left.len, right.getData(), right.len);
+        memcpy(result.prefix, buffer, ku_string_t::PREFIX_LENGTH);
+    }
+}
+
 struct ConditionalConcat {
     static inline void operation(
         ku_string_t& a, bool& b, ku_string_t& c, ku_string_t& result, ValueVector& resultVector) {
         // Concat a,c if b is true, otherwise concat c,a.
         if (b) {
-            function::Concat::operation(a, c, result, resultVector);
+            concat(a, c, result, resultVector);
         } else {
-            function::Concat::operation(c, a, result, resultVector);
+            concat(c, a, result, resultVector);
         }
     }
 };

test/test_files/tinysnb/function/string.test

@@ -627,3 +627,45 @@ hellolongstringtest
 -STATEMENT return levenshtein('horse', 'ros');
 ---- 1
 3
+
+-LOG ConcatMultipleStrings
+-STATEMENT match (p:person) return concat("name: ", p.fName, ' ,age: ', "5");
+---- 8
+name: Alice ,age: 5
+name: Bob ,age: 5
+name: Carol ,age: 5
+name: Dan ,age: 5
+name: Elizabeth ,age: 5
+name: Farooq ,age: 5
+name: Greg ,age: 5
+name: Hubert Blaine Wolfeschlegelsteinhausenbergerdorff ,age: 5
+-STATEMENT match (p:person)-[:knows]->(p1:person) return concat("From: ", p.fName, ', To: ', p1.fName);
+---- 14
+From: Alice, To: Bob
+From: Alice, To: Carol
+From: Alice, To: Dan
+From: Bob, To: Alice
+From: Bob, To: Carol
+From: Bob, To: Dan
+From: Carol, To: Alice
+From: Carol, To: Bob
+From: Carol, To: Dan
+From: Dan, To: Alice
+From: Dan, To: Bob
+From: Dan, To: Carol
+From: Elizabeth, To: Farooq
+From: Elizabeth, To: Greg
+
+-LOG InitCapStrings
+-STATEMENT match (o:organisation) return initcap(o.name);
+---- 3
+Abfsuni
+Cswork
+Deswork
+
+-LOG InitCapUTF8String
+-STATEMENT match (m:movies) return initcap(m.name);
+---- 3
+Sóló cón tu párejâ
+The 😂😃🧘🏻‍♂️🌍🌦️🍞🚗 movie
+Roma