fix compile err on windows

source/libs/executor/src/scanoperator.c

@@ -1786,7 +1786,7 @@ void streamScanOperatorDecode(void* pBuff, int32_t len, SStreamScanInfo* pInfo)
   }
   void* buf = pBuff;
   buf = decodeSTimeWindowAggSupp(buf, &pInfo->twAggSup);
-  int32_t tlen = len - (pBuff - buf);
+  int32_t tlen = len - ((char *)pBuff - (char *)buf); // fix windows compile error
 
   void* pUpInfo = taosMemoryCalloc(1, sizeof(SUpdateInfo));
   int32_t code = pInfo->stateStore.updateInfoDeserialize(buf, tlen, pUpInfo);