use size_t instead of int32_t to avoid possible loss of data

src/common/inc/tname.h

@@ -25,7 +25,7 @@ void extractTableName(const char *tableId, char *name);
 
 char* extractDBName(const char *tableId, char *name);
 
-int32_t tableIdPrefix(const char* pDb, char* prefix, int32_t len);
+size_t tableIdPrefix(const char* pDb, char* prefix, int32_t len);
 
 void extractTableNameFromToken(SStrToken *pToken, SStrToken* pTable);
 

src/common/src/tname.c

@@ -39,7 +39,7 @@ char* extractDBName(const char* tableId, char* name) {
   return strncpy(name, &tableId[offset1 + 1], len);
 }
 
-int32_t tableIdPrefix(const char* name, char* prefix, int32_t len) {
+size_t tableIdPrefix(const char* name, char* prefix, int32_t len) {
   tstrncpy(prefix, name, len);
   strcat(prefix, TS_PATH_DELIMITER);
 

src/mnode/src/mnodeTable.c

@@ -1736,7 +1736,7 @@ static int32_t mnodeDoCreateChildTable(SMnodeMsg *pMsg, int32_t tid) {
     STagData *pTagData = (STagData *)pCreate->schema;  // it is a tag key
 
     char prefix[64] = {0};
-    int32_t prefixLen = tableIdPrefix(pMsg->pDb->name, prefix, 64);
+    size_t prefixLen = tableIdPrefix(pMsg->pDb->name, prefix, 64);
     if (0 != strncasecmp(prefix, pTagData->name, prefixLen)) {
       mError("msg:%p, app:%p table:%s, corresponding super table:%s not in this db", pMsg, pMsg->rpcMsg.ahandle,
              pCreate->tableId, pTagData->name);