diff --git a/src/util/src/tcompare.c b/src/util/src/tcompare.c
index 921da82d448eca639f5e832c0fd3b606d22c4d82..1b980a4a1dc864da142f8ccdeb4104b5d06fde46 100644
--- a/src/util/src/tcompare.c
+++ b/src/util/src/tcompare.c
@@ -199,16 +199,7 @@ int32_t compareLenPrefixedWStr(const void *pLeft, const void *pRight) {
   if (len1 != len2) {
     return len1 > len2? 1:-1;
   } else {
-    char *pLeftTerm = (char *)tcalloc(len1 + 1, sizeof(char));
-    char *pRightTerm = (char *)tcalloc(len1 + 1, sizeof(char));
-    memcpy(pLeftTerm, varDataVal(pLeft), len1);
-    memcpy(pRightTerm, varDataVal(pRight), len2);
-
-    int32_t ret = wcsncmp((wchar_t*) pLeftTerm, (wchar_t*) pRightTerm, len1/TSDB_NCHAR_SIZE);
-
-    tfree(pLeftTerm);
-    tfree(pRightTerm);
-
+    int32_t ret = memcmp((wchar_t*) pLeft, (wchar_t*) pRight, len1);
     if (ret == 0) {
       return 0;
     } else {
@@ -518,17 +509,7 @@ int32_t doCompare(const char* f1, const char* f2, int32_t type, size_t size) {
       if (t1->len != t2->len) {
         return t1->len > t2->len? 1:-1;
       }
-
-      char *t1_term = (char *)tcalloc(t1->len + 1, sizeof(char));
-      char *t2_term = (char *)tcalloc(t2->len + 1, sizeof(char));
-      memcpy(t1_term, t1->data, t1->len);
-      memcpy(t2_term, t2->data, t2->len);
-
-      int32_t ret = wcsncmp((wchar_t*) t1_term, (wchar_t*) t2_term, t2->len/TSDB_NCHAR_SIZE);
-
-      tfree(t1_term);
-      tfree(t2_term);
-
+      int32_t ret = memcmp((wchar_t*) t1, (wchar_t*) t2, t2->len);
       if (ret == 0) {
         return ret;
       }