fix:reset measuretag pointer if it is the same child table

source/client/src/clientSml.c

@@ -1371,7 +1371,7 @@ static int32_t smlParseLine(SSmlHandle *info, char *lines[], char *rawLine, char
       if (info->dataFormat) {
         SSmlLineInfo element = {0};
         code = smlParseTelnetString(info, (char *)tmp, (char *)tmp + len, &element);
-        taosMemoryFree(element.measureTag);
+        if(element.measureTagsLen != 0) taosMemoryFree(element.measureTag);
       } else {
         code = smlParseTelnetString(info, (char *)tmp, (char *)tmp + len, info->lines + i);
       }

source/client/src/clientSmlJson.c

@@ -1271,7 +1271,7 @@ int32_t smlParseJSON(SSmlHandle *info, char *payload) {
     if(info->dataFormat) {
       SSmlLineInfo element = {0};
       ret = smlParseJSONString(info, &dataPointStart, &element);
-      taosMemoryFree(element.measureTag);
+      if(element.measureTagsLen != 0) taosMemoryFree(element.measureTag);
     }else{
       if(cnt >= payloadNum){
         payloadNum = payloadNum << 1;