diff --git a/include/libs/stream/streamState.h b/include/libs/stream/streamState.h
index ae84299c1c02d6cc7c1f1b30ac07bbf621dc294f..b61faf957f4a219d90a91d699bc97905fb359a37 100644
--- a/include/libs/stream/streamState.h
+++ b/include/libs/stream/streamState.h
@@ -88,6 +88,8 @@ int32_t streamStateGetByPos(SStreamState* pState, void* pos, void** pVal);
 int32_t streamStateDel(SStreamState* pState, const SWinKey* key);
 int32_t streamStateClear(SStreamState* pState);
 void    streamStateSetNumber(SStreamState* pState, int32_t number);
+int32_t streamStateSaveInfo(SStreamState* pState, void* pKey, int32_t keyLen, void* pVal, int32_t vLen);
+int32_t streamStateGetInfo(SStreamState* pState, void* pKey, int32_t keyLen, void** pVal, int32_t* pLen);
 
 int32_t streamStateSessionAddIfNotExist(SStreamState* pState, SSessionKey* key, TSKEY gap, void** pVal, int32_t* pVLen);
 int32_t streamStateSessionPut(SStreamState* pState, const SSessionKey* key, const void* value, int32_t vLen);
diff --git a/source/libs/executor/src/scanoperator.c b/source/libs/executor/src/scanoperator.c
index bc19572394418f67e35f23c4f721a889972f8171..49623dc61979587990071b17ac0539d8ec5dcc62 100644
--- a/source/libs/executor/src/scanoperator.c
+++ b/source/libs/executor/src/scanoperator.c
@@ -36,6 +36,7 @@ int32_t scanDebug = 0;
 #define MULTI_READER_MAX_TABLE_NUM   5000
 #define SET_REVERSE_SCAN_FLAG(_info) ((_info)->scanFlag = REVERSE_SCAN)
 #define SWITCH_ORDER(n)              (((n) = ((n) == TSDB_ORDER_ASC) ? TSDB_ORDER_DESC : TSDB_ORDER_ASC))
+#define STREAM_SCAN_OP_NAME          "StreamScanOperator"
 
 typedef struct STableMergeScanExecInfo {
   SFileBlockLoadRecorder blockRecorder;
@@ -1771,7 +1772,7 @@ int32_t streamScanOperatorEncode(SStreamScanInfo* pInfo, void** pBuff) {
 
 // other properties are recovered from the execution plan
 void streamScanOperatorDeocde(void* pBuff, int32_t len, SStreamScanInfo* pInfo) {
-  if (!pBuff) {
+  if (!pBuff || len == 0) {
     return;
   }
 
@@ -2054,10 +2055,12 @@ FETCH_NEXT_BLOCK:
           updateInfoDestoryColseWinSBF(pInfo->pUpdateInfo);
           doClearBufferedBlocks(pInfo);
           qDebug("stream scan return empty, consume block %d", totBlockNum);
-          // void* buff = NULL;
-          // int32_t len = streamScanOperatorEncode(pInfo, &buff);
-          // todo(liuyao) save buff
-          // taosMemoryFreeClear(buff);
+          void* buff = NULL;
+          int32_t len = streamScanOperatorEncode(pInfo, &buff);
+          if (len > 0) {
+            streamStateSaveInfo(pInfo->pState, STREAM_SCAN_OP_NAME, strlen(STREAM_SCAN_OP_NAME), buff, len);
+          }
+          taosMemoryFreeClear(buff);
           return NULL;
         }
 
@@ -2484,12 +2487,12 @@ SOperatorInfo* createStreamScanOperatorInfo(SReadHandle* pHandle, STableScanPhys
   pInfo->twAggSup.maxTs = INT64_MIN;
   pInfo->pState = NULL;
 
-  // todo(liuyao) get buff from rocks db;
   void*   buff = NULL;
   int32_t len = 0;
+  streamStateGetInfo(pTaskInfo->streamInfo.pState, STREAM_SCAN_OP_NAME, strlen(STREAM_SCAN_OP_NAME), &buff, &len);
   streamScanOperatorDeocde(buff, len, pInfo);
 
-  setOperatorInfo(pOperator, "StreamScanOperator", QUERY_NODE_PHYSICAL_PLAN_STREAM_SCAN, false, OP_NOT_OPENED, pInfo,
+  setOperatorInfo(pOperator, STREAM_SCAN_OP_NAME, QUERY_NODE_PHYSICAL_PLAN_STREAM_SCAN, false, OP_NOT_OPENED, pInfo,
                   pTaskInfo);
   pOperator->exprSupp.numOfExprs = taosArrayGetSize(pInfo->pRes->pDataBlock);
 
diff --git a/source/libs/executor/src/timewindowoperator.c b/source/libs/executor/src/timewindowoperator.c
index 2a0bfe4856c3ea04e487d18d1239f3c96314d9cc..f6f4a75cd97f62c50d89ffef61477f3fe0836e69 100644
--- a/source/libs/executor/src/timewindowoperator.c
+++ b/source/libs/executor/src/timewindowoperator.c
@@ -2846,6 +2846,7 @@ void initDownStream(SOperatorInfo* downstream, SStreamAggSupporter* pAggSup, uin
   }
   SStreamScanInfo* pScanInfo = downstream->info;
   pScanInfo->windowSup = (SWindowSupporter){.pStreamAggSup = pAggSup, .gap = pAggSup->gap, .parentType = type};
+  pScanInfo->pState = pAggSup->pState;
   if (!pScanInfo->igCheckUpdate && !pScanInfo->pUpdateInfo) {
     pScanInfo->pUpdateInfo = updateInfoInit(60000, TSDB_TIME_PRECISION_MILLI, pTwSup->waterMark);
   }
diff --git a/source/libs/stream/src/streamState.c b/source/libs/stream/src/streamState.c
index fee65d6c58e95097f3d6e7614252da97f67934a5..9e49ae9e9784290f98a70c447d76d1136f78c312 100644
--- a/source/libs/stream/src/streamState.c
+++ b/source/libs/stream/src/streamState.c
@@ -395,6 +395,32 @@ int32_t streamStateClear(SStreamState* pState) {
 
 void streamStateSetNumber(SStreamState* pState, int32_t number) { pState->number = number; }
 
+int32_t streamStateSaveInfo(SStreamState* pState, void* pKey, int32_t keyLen, void* pVal, int32_t vLen) {
+#ifdef USE_ROCKSDB
+  int32_t code = 0;
+  void* batch = streamStateCreateBatch();
+  code = streamStatePutBatch(pState, "default", batch, pKey, pVal, vLen);
+  if (code != 0) {
+    return code;
+  }
+  code = streamStatePutBatch_rocksdb(pState, batch);
+  streamStateDestroyBatch(batch);
+  return code;
+#else
+ return 0;
+#endif
+}
+
+int32_t streamStateGetInfo(SStreamState* pState, void* pKey, int32_t keyLen, void** pVal, int32_t* pLen) {
+#ifdef USE_ROCKSDB
+ int32_t code = 0;
+ code = streamDefaultGet_rocksdb(pState, pKey, pVal, pLen);
+ return code;
+#else
+ return 0;
+#endif
+}
+
 int32_t streamStateAddIfNotExist(SStreamState* pState, const SWinKey* key, void** pVal, int32_t* pVLen) {
 #ifdef USE_ROCKSDB
   return streamStateGet(pState, key, pVal, pVLen);
@@ -1066,7 +1092,7 @@ void streamStateDestroy(SStreamState* pState) {
 #ifdef USE_ROCKSDB
   streamFileStateDestroy(pState->pFileState);
   streamStateDestroy_rocksdb(pState);
-  taosMemoryFreeClear(pState->parNameMap);
+  tSimpleHashCleanup(pState->parNameMap);
   // do nothong
 #endif
   taosMemoryFreeClear(pState->pTdbState);
diff --git a/source/libs/stream/src/streamUpdate.c b/source/libs/stream/src/streamUpdate.c
index 70a1c543f648104064c311084b5d634517be4c2e..fff666ec9f3f90bd60d921a011fbd8925c52696f 100644
--- a/source/libs/stream/src/streamUpdate.c
+++ b/source/libs/stream/src/streamUpdate.c
@@ -274,7 +274,10 @@ void updateInfoDestoryColseWinSBF(SUpdateInfo *pInfo) {
 }
 
 int32_t updateInfoSerialize(void *buf, int32_t bufLen, const SUpdateInfo *pInfo) {
-  ASSERT(pInfo);
+  if(!pInfo) {
+    return 0;
+  }
+
   SEncoder encoder = {0};
   tEncoderInit(&encoder, buf, bufLen);
   if (tStartEncode(&encoder) < 0) return -1;
diff --git a/tests/script/tsim/stream/basic2.sim b/tests/script/tsim/stream/basic2.sim
index 20e8c953912e07dd469d6eaf042cb28bdb45d436..8d0df2697be8a2ffceea69701e78c20fae4efff1 100644
--- a/tests/script/tsim/stream/basic2.sim
+++ b/tests/script/tsim/stream/basic2.sim
@@ -48,23 +48,34 @@ sleep 100
 #===================================================================
 print =============== query data from child table
 
+$loop_count = 0
+
+loop0:
+
+sleep 200
+
+$loop_count = $loop_count + 1
+if $loop_count == 10 then
+  return -1
+endi
+
 sql select `_wstart`,`min(k)`,`max(k)`,sum_alias from outstb
 print rows: $rows 
 print $data00  $data01 $data02 $data03
 if $rows != 1 then
-  return -1
+  goto loop0
 endi
 
 if $data01 != 234 then 
-  return -1
+  goto loop0
 endi
 
 if $data02 != 234 then 
-  return -1
+  goto loop0
 endi
 
 if $data03 != 234 then 
-  return -1
+  goto loop0
 endi
 
 #===================================================================
@@ -77,36 +88,47 @@ sleep 100
 #===================================================================
 print =============== query data from child table
 
+$loop_count = 0
+
+loop1:
+
+sleep 200
+
+$loop_count = $loop_count + 1
+if $loop_count == 10 then
+  return -1
+endi
+
 sql select `_wstart`,`min(k)`,`max(k)`,sum_alias from outstb
 print rows: $rows 
 print $data00  $data01 $data02 $data03
 print $data10  $data11 $data12 $data13
 if $rows != 2 then
-  return -1
+  goto loop1
 endi
 
 if $data01 != 234 then 
-  return -1
+  goto loop1
 endi
 
 if $data02 != 234 then 
-  return -1
+  goto loop1
 endi
 
 if $data03 != 234 then 
-  return -1
+  goto loop1
 endi
 
 if $data11 != -111 then 
-  return -1
+  goto loop1
 endi
 
 if $data12 != -111 then 
-  return -1
+  goto loop1
 endi
 
 if $data13 != -111 then 
-  return -1
+  goto loop1
 endi
 
 system sh/exec.sh -n dnode1 -s stop -x SIGINT