Merge pull request #5019 from taosdata/hotfix/TD-2781

[TD-2781]taosd crashes when query tag is nchar

src/common/src/tvariant.c

@@ -775,7 +775,7 @@ int32_t tVariantDump(tVariant *pVariant, char *payload, int16_t type, bool inclu
               return -1;
             }
           } else {
-            wcsncpy((wchar_t *)p, pVariant->wpz, pVariant->nLen);
+            memcpy(p, pVariant->wpz, pVariant->nLen);
             newlen = pVariant->nLen;
           }
 
@@ -867,4 +867,4 @@ int32_t tVariantTypeSetType(tVariant *pVariant, char type) {
   }
   
   return 0;
-}
\ No newline at end of file
+}