Fix issue 938

src/function/list/operations/include/list_extract_operation.h

@@ -36,8 +36,12 @@ struct ListExtract {
     }
 
     static inline void operation(ku_string_t& str, int64_t& idx, ku_string_t& result) {
-        auto pos = idx > 0 ? min(idx, (int64_t)str.len) : max(str.len + idx, (int64_t)0) + 1;
-        result.set((char*)(str.getData() + pos - 1), 1 /* length */);
+        if (str.len < idx) {
+            result.set("", 0);
+        } else {
+            auto pos = idx > 0 ? min(idx, (int64_t)str.len) : max(str.len + idx, (int64_t)0) + 1;
+            result.set((char*)(str.getData() + pos - 1), 1 /* length */);
+        }
     }
 
     static inline void operation(Value& item, int64_t& pos, Value& result) {

src/function/string/operations/include/left_operation.h

@@ -18,8 +18,8 @@ struct Left {
 public:
     static inline void operation(
         ku_string_t& left, int64_t& right, ku_string_t& result, ValueVector& resultValueVector) {
-        auto len = right > 0 ? min(left.len, (uint32_t)right) :
-                               max(left.len + (uint32_t)right, (uint32_t)0u);
+        auto len = right >= 0 ? min(left.len, (uint32_t)right) :
+                                ((uint32_t)max(left.len + right, (int64_t)0));
         SubStr::operation(left, 1, len, result, resultValueVector);
     }
 };

src/function/string/operations/include/pad_operation.h

@@ -17,6 +17,10 @@ struct PadOperation {
     static inline void operation(ku_string_t& src, int64_t count, ku_string_t& characterToPad,
         ku_string_t& result, ValueVector& resultValueVector,
         void (*padOperation)(ku_string_t& result, ku_string_t& src, ku_string_t& characterToPad)) {
+        if (count <= 0) {
+            result.set("", 0);
+            return;
+        }
         assert(characterToPad.len == 1);
         result.len = count;
         if (!ku_string_t::isShortString(result.len)) {

src/function/string/operations/include/right_operation.h

@@ -18,8 +18,8 @@ struct Right {
 public:
     static inline void operation(
         ku_string_t& left, int64_t& right, ku_string_t& result, ValueVector& resultValueVector) {
-        auto len = right > 0 ? min(left.len, (uint32_t)right) :
-                               max((uint32_t)0u, left.len + (uint32_t)right);
+        auto len = right >= 0 ? min(left.len, (uint32_t)right) :
+                                ((uint32_t)max((int64_t)0, left.len + right));
         SubStr::operation(left, left.len - len + 1, len, result, resultValueVector);
     }
 };

test/test_files/tinySNB/function/string.test

@@ -343,6 +343,18 @@ Huber
 #
 #
 
+-NAME LpadOutOfRange
+-QUERY MATCH (p:person) RETURN lpad(p.fName, -10, "t")
+---- 8
+
+
+
+
+
+
+
+
+
 -NAME RpadStructuredStrAndLiteralInt
 -QUERY MATCH (p:person) RETURN rpad(p.fName, 15, ">")
 ---- 8
@@ -380,6 +392,13 @@ Hubert Bla
 #
 #
 
+-NAME RpadOutOfRange
+-QUERY MATCH (o:organisation) RETURN rpad(o.name, -8, "y")
+---- 3
+
+
+
+
 -NAME SubStrStructuredStrAndLiteralInt
 -QUERY MATCH (p:person) RETURN substr(p.fName, 2, 12)
 ---- 8
@@ -424,16 +443,16 @@ CsWo
 DEsWor
 
 -NAME LeftNegativeIdxStructuredStrAndLiteralInt
--QUERY MATCH (p:person) RETURN left(p.fName, -3)
+-QUERY MATCH (p:person) RETURN left(p.fName, -4)
 ---- 8
-Al
+A
+
+C
 
-Ca
+Eliza
+Fa
 
-Elizab
-Far
-G
-Hubert Blaine Wolfeschlegelsteinhausenbergerdo
+Hubert Blaine Wolfeschlegelsteinhausenbergerd
 
 # TODO(Semih): Uncomment when enabling ad-hoc properties
 #-NAME LeftUnstructuredStrAndLiteralInt
@@ -468,16 +487,16 @@ Work
 EsWork
 
 -NAME RightNegativeIdxStructuredStrAndLiteralInt
--QUERY MATCH (p:person) RETURN right(p.fName, -2)
+-QUERY MATCH (p:person) RETURN right(p.fName, -4)
 ---- 8
-ice
-b
-rol
-n
-izabeth
-rooq
-eg
-bert Blaine Wolfeschlegelsteinhausenbergerdorff
+e
+
+l
+
+abeth
+oq
+
+rt Blaine Wolfeschlegelsteinhausenbergerdorff
 
 # TODO(Semih): Uncomment when enabling ad-hoc properties
 #-NAME RightUnstructuredStrAndLiteralInt
@@ -513,6 +532,25 @@ B
 s
 E
 
+-NAME ListExtractOutOfRange
+-QUERY MATCH (a:person) RETURN a.fName[8]
+---- 8
+
+
+
+
+t
+
+
+B
+
+-NAME ListExtractNegativeIndex
+-QUERY MATCH (o:organisation) RETURN o.name[-2]
+---- 3
+n
+r
+r
+
 # TODO(Semih): Uncomment when enabling ad-hoc properties
 #-NAME ListExtractUnstructuredString
 #-QUERY MATCH (o:organisation) RETURN o.unstrStr[4]