fix: skip delete msg affects 0 row

source/dnode/vnode/src/sma/smaRollup.c

@@ -1550,13 +1550,17 @@ static int32_t tdRSmaBatchExec(SSma *pSma, SRSmaInfo *pInfo, STaosQall *qall, SA
           taosFreeQitem(msg);
           goto _err;
         }
-        if (!taosArrayPush(pSubmitArr, &packData)) {
+
+        if (packData.pDataBlock && !taosArrayPush(pSubmitArr, &packData)) {
           taosFreeQitem(msg);
           terrno = TSDB_CODE_OUT_OF_MEMORY;
           goto _err;
         }
         taosFreeQitem(msg);
-        ++nDelete;
+        if (packData.pDataBlock) {
+          // packData.pDataBlock is NULL if delete affects 0 row
+          ++nDelete;
+        }
       } else {
         ASSERTS(0, "unknown msg type:%d", inputType);
         break;

source/libs/executor/src/scanoperator.c

@@ -2106,11 +2106,6 @@ FETCH_NEXT_BLOCK:
     SPackedData* pPacked = taosArrayGet(pInfo->pBlockLists, current);
     SSDataBlock* pBlock = pPacked->pDataBlock;
 
-    if(!pBlock) {
-      doClearBufferedBlocks(pInfo);
-      return NULL;
-    }
-
     if (pBlock->info.parTbName[0]) {
       pAPI->stateStore.streamStatePutParName(pStreamInfo->pState, pBlock->info.id.groupId, pBlock->info.parTbName);
     }