diff --git a/docs/zh/12-taos-sql/14-stream.md b/docs/zh/12-taos-sql/14-stream.md
index a967299e40..28f52be59a 100644
--- a/docs/zh/12-taos-sql/14-stream.md
+++ b/docs/zh/12-taos-sql/14-stream.md
@@ -18,7 +18,7 @@ stream_options: {
 其中 subquery 是 select 普通查询语法的子集:
 
 ```sql
-subquery: SELECT [DISTINCT] select_list
+subquery: SELECT select_list
     from_clause
     [WHERE condition]
     [PARTITION BY tag_list]
@@ -37,7 +37,7 @@ window_clause: {
 
 其中，SESSION 是会话窗口，tol_val 是时间间隔的最大范围。在 tol_val 时间间隔范围内的数据都属于同一个窗口，如果连续的两条数据的时间超过 tol_val，则自动开启下一个窗口。
 
-窗口的定义与时序数据特色查询中的定义完全相同。
+窗口的定义与时序数据特色查询中的定义完全相同，详见 [TDengine 特色查询](../distinguished)
 
 例如，如下语句创建流式计算，同时自动创建名为 avg_vol 的超级表，此流计算以一分钟为时间窗口、30 秒为前向增量统计这些电表的平均电压，并将来自 meters 表的数据的计算结果写入 avg_vol 表，不同 partition 的数据会分别创建子表并写入不同子表。
 
diff --git a/docs/zh/28-releases/01-tdengine.md b/docs/zh/28-releases/01-tdengine.md
index a64798caa0..1e97572ca4 100644
--- a/docs/zh/28-releases/01-tdengine.md
+++ b/docs/zh/28-releases/01-tdengine.md
@@ -9,7 +9,7 @@ import Release from "/components/ReleaseV3";
 
 <Release type="tdengine" version="3.0.0.1" />
 
-## 3.0.0.0
+<!-- ## 3.0.0.0
 
-<Release type="tdengine" version="3.0.0.0" />
+<Release type="tdengine" version="3.0.0.0" /> -->
 
diff --git a/examples/c/stream_demo.c b/examples/c/stream_demo.c
index 2fcf4dd62c..1c9d11b755 100644
--- a/examples/c/stream_demo.c
+++ b/examples/c/stream_demo.c
@@ -13,6 +13,7 @@
  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  */
 
+// clang-format off
 #include <assert.h>
 #include <stdio.h>
 #include <string.h>
@@ -94,13 +95,8 @@ int32_t create_stream() {
   }
   taos_free_result(pRes);
 
-  /*const char* sql = "select min(k), max(k), sum(k) from tu1";*/
-  /*const char* sql = "select min(k), max(k), sum(k) as sum_of_k from st1";*/
-  /*const char* sql = "select sum(k) from tu1 interval(10m)";*/
-  /*pRes = tmq_create_stream(pConn, "stream1", "out1", sql);*/
   pRes = taos_query(pConn,
-                    "create stream stream1 trigger max_delay 10s watermark 10s into outstb as select _wstart start, "
-                    "count(k) from st1 partition by tbname interval(20s) ");
+                    "create stream stream1 trigger at_once watermark 10s into outstb as select _wstart start, avg(k) from st1 partition by tbname interval(10s)");
   if (taos_errno(pRes) != 0) {
     printf("failed to create stream stream1, reason:%s\n", taos_errstr(pRes));
     return -1;
diff --git a/include/common/tcommon.h b/include/common/tcommon.h
index dbe020f7ec..fb59d8b9a0 100644
--- a/include/common/tcommon.h
+++ b/include/common/tcommon.h
@@ -44,6 +44,30 @@ enum {
 )
 // clang-format on
 
+typedef struct {
+  TSKEY    ts;
+  uint64_t groupId;
+} SWinKey;
+
+static inline int SWinKeyCmpr(const void* pKey1, int kLen1, const void* pKey2, int kLen2) {
+  SWinKey* pWin1 = (SWinKey*)pKey1;
+  SWinKey* pWin2 = (SWinKey*)pKey2;
+
+  if (pWin1->groupId > pWin2->groupId) {
+    return 1;
+  } else if (pWin1->groupId < pWin2->groupId) {
+    return -1;
+  }
+
+  if (pWin1->ts > pWin2->ts) {
+    return 1;
+  } else if (pWin1->ts < pWin2->ts) {
+    return -1;
+  }
+
+  return 0;
+}
+
 enum {
   TMQ_MSG_TYPE__DUMMY = 0,
   TMQ_MSG_TYPE__POLL_RSP,
diff --git a/include/libs/executor/executor.h b/include/libs/executor/executor.h
index a64815f14f..1ce88905c2 100644
--- a/include/libs/executor/executor.h
+++ b/include/libs/executor/executor.h
@@ -29,7 +29,7 @@ typedef void* DataSinkHandle;
 struct SRpcMsg;
 struct SSubplan;
 
-typedef struct SReadHandle {
+typedef struct {
   void*   tqReader;
   void*   meta;
   void*   config;
@@ -41,6 +41,7 @@ typedef struct SReadHandle {
   bool    initTableReader;
   bool    initTqReader;
   int32_t numOfVgroups;
+  void*   pStateBackend;
 } SReadHandle;
 
 // in queue mode, data streams are seperated by msg
@@ -78,8 +79,8 @@ int32_t qSetMultiStreamInput(qTaskInfo_t tinfo, const void* pBlocks, size_t numO
 
 /**
  * @brief Cleanup SSDataBlock for StreamScanInfo
- * 
- * @param tinfo 
+ *
+ * @param tinfo
  */
 void tdCleanupStreamInputDataBlock(qTaskInfo_t tinfo);
 
@@ -163,7 +164,7 @@ int32_t qGetQualifiedTableIdList(void* pTableList, const char* tagCond, int32_t
 
 void qProcessRspMsg(void* parent, struct SRpcMsg* pMsg, struct SEpSet* pEpSet);
 
-int32_t qGetExplainExecInfo(qTaskInfo_t tinfo, SArray* pExecInfoList/*,int32_t* resNum, SExplainExecInfo** pRes*/);
+int32_t qGetExplainExecInfo(qTaskInfo_t tinfo, SArray* pExecInfoList /*,int32_t* resNum, SExplainExecInfo** pRes*/);
 
 int32_t qSerializeTaskStatus(qTaskInfo_t tinfo, char** pOutput, int32_t* len);
 
diff --git a/include/libs/stream/tstream.h b/include/libs/stream/tstream.h
index 384c6a289f..2c27509008 100644
--- a/include/libs/stream/tstream.h
+++ b/include/libs/stream/tstream.h
@@ -263,6 +263,14 @@ typedef struct {
   SArray* checkpointVer;
 } SStreamRecoveringState;
 
+// incremental state storage
+typedef struct {
+  SStreamTask* pOwner;
+  TDB*         db;
+  TTB*         pStateDb;
+  TXN          txn;
+} SStreamState;
+
 typedef struct SStreamTask {
   int64_t streamId;
   int32_t taskId;
@@ -312,6 +320,10 @@ typedef struct SStreamTask {
 
   // msg handle
   SMsgCb* pMsgCb;
+
+  // state backend
+  SStreamState* pState;
+
 } SStreamTask;
 
 int32_t tEncodeStreamEpInfo(SEncoder* pEncoder, const SStreamChildEpInfo* pInfo);
@@ -507,7 +519,7 @@ typedef struct SStreamMeta {
   char*        path;
   TDB*         db;
   TTB*         pTaskDb;
-  TTB*         pStateDb;
+  TTB*         pCheckpointDb;
   SHashObj*    pTasks;
   SHashObj*    pRecoverStatus;
   void*        ahandle;
@@ -528,6 +540,37 @@ int32_t streamMetaCommit(SStreamMeta* pMeta);
 int32_t streamMetaRollBack(SStreamMeta* pMeta);
 int32_t streamLoadTasks(SStreamMeta* pMeta);
 
+SStreamState* streamStateOpen(char* path, SStreamTask* pTask);
+void          streamStateClose(SStreamState* pState);
+int32_t       streamStateBegin(SStreamState* pState);
+int32_t       streamStateCommit(SStreamState* pState);
+int32_t       streamStateAbort(SStreamState* pState);
+
+typedef struct {
+  TBC* pCur;
+} SStreamStateCur;
+
+#if 1
+int32_t streamStatePut(SStreamState* pState, const SWinKey* key, const void* value, int32_t vLen);
+int32_t streamStateGet(SStreamState* pState, const SWinKey* key, void** pVal, int32_t* pVLen);
+int32_t streamStateDel(SStreamState* pState, const SWinKey* key);
+void    streamFreeVal(void* val);
+
+SStreamStateCur* streamStateGetCur(SStreamState* pState, const SWinKey* key);
+SStreamStateCur* streamStateSeekKeyNext(SStreamState* pState, const SWinKey* key);
+SStreamStateCur* streamStateSeekKeyPrev(SStreamState* pState, const SWinKey* key);
+void             streamStateFreeCur(SStreamStateCur* pCur);
+
+int32_t streamStateGetKVByCur(SStreamStateCur* pCur, SWinKey* pKey, const void** pVal, int32_t* pVLen);
+
+int32_t streamStateSeekFirst(SStreamState* pState, SStreamStateCur* pCur);
+int32_t streamStateSeekLast(SStreamState* pState, SStreamStateCur* pCur);
+
+int32_t streamStateCurNext(SStreamState* pState, SStreamStateCur* pCur);
+int32_t streamStateCurPrev(SStreamState* pState, SStreamStateCur* pCur);
+
+#endif
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/source/common/src/tglobal.c b/source/common/src/tglobal.c
index a628f551f4..3bbbb8b463 100644
--- a/source/common/src/tglobal.c
+++ b/source/common/src/tglobal.c
@@ -76,7 +76,7 @@ bool     tsMonitorComp = false;
 
 // telem
 bool     tsEnableTelem = true;
-int32_t  tsTelemInterval = 86400;
+int32_t  tsTelemInterval = 43200;
 char     tsTelemServer[TSDB_FQDN_LEN] = "telemetry.taosdata.com";
 uint16_t tsTelemPort = 80;
 
diff --git a/source/dnode/mnode/impl/src/mndTelem.c b/source/dnode/mnode/impl/src/mndTelem.c
index 27814fe5be..93f7531a27 100644
--- a/source/dnode/mnode/impl/src/mndTelem.c
+++ b/source/dnode/mnode/impl/src/mndTelem.c
@@ -131,7 +131,9 @@ static int32_t mndProcessTelemTimer(SRpcMsg* pReq) {
   char* pCont = mndBuildTelemetryReport(pMnode);
   if (pCont != NULL) {
     if (taosSendHttpReport(tsTelemServer, tsTelemPort, pCont, strlen(pCont), HTTP_FLAT) != 0) {
-      mError("failed to send telemetry msg");
+      mError("failed to send telemetry report");
+    } else {
+      mTrace("succeed to send telemetry report");
     }
     taosMemoryFree(pCont);
   }
diff --git a/source/dnode/mnode/impl/src/mndTrans.c b/source/dnode/mnode/impl/src/mndTrans.c
index 17b4336465..c77a80cc82 100644
--- a/source/dnode/mnode/impl/src/mndTrans.c
+++ b/source/dnode/mnode/impl/src/mndTrans.c
@@ -1308,7 +1308,7 @@ static bool mndTransPerformRedoActionStage(SMnode *pMnode, STrans *pTrans) {
     if (pTrans->policy == TRN_POLICY_ROLLBACK) {
       if (pTrans->lastAction != 0) {
         STransAction *pAction = taosArrayGet(pTrans->redoActions, pTrans->lastAction);
-        if (pAction->retryCode != 0 && pAction->retryCode != pAction->errCode) {
+        if (pAction->retryCode != 0 && pAction->retryCode == pAction->errCode) {
           if (pTrans->failedTimes < 6) {
             mError("trans:%d, stage keep on redoAction since action:%d code:0x%x not 0x%x, failedTimes:%d", pTrans->id,
                    pTrans->lastAction, pTrans->code, pAction->retryCode, pTrans->failedTimes);
diff --git a/source/dnode/mnode/impl/test/sma/CMakeLists.txt b/source/dnode/mnode/impl/test/sma/CMakeLists.txt
index 3f9ec123a8..a55b45ca11 100644
--- a/source/dnode/mnode/impl/test/sma/CMakeLists.txt
+++ b/source/dnode/mnode/impl/test/sma/CMakeLists.txt
@@ -5,7 +5,9 @@ target_link_libraries(
     PUBLIC sut
 )
 
-add_test(
-    NAME smaTest
-    COMMAND smaTest
-)
+if(NOT ${TD_WINDOWS})
+    add_test(
+        NAME smaTest
+        COMMAND smaTest
+    )
+endif(NOT ${TD_WINDOWS})
diff --git a/source/dnode/mnode/impl/test/stb/CMakeLists.txt b/source/dnode/mnode/impl/test/stb/CMakeLists.txt
index dcfbe658fc..e3a3fc2e79 100644
--- a/source/dnode/mnode/impl/test/stb/CMakeLists.txt
+++ b/source/dnode/mnode/impl/test/stb/CMakeLists.txt
@@ -5,7 +5,9 @@ target_link_libraries(
     PUBLIC sut
 )
 
-add_test(
-    NAME stbTest
-    COMMAND stbTest
-)
\ No newline at end of file
+if(NOT ${TD_WINDOWS})
+    add_test(
+        NAME stbTest
+        COMMAND stbTest
+    )
+endif(NOT ${TD_WINDOWS})
\ No newline at end of file
diff --git a/source/dnode/vnode/src/tq/tq.c b/source/dnode/vnode/src/tq/tq.c
index c6bc8e6e59..3ff59ac2c0 100644
--- a/source/dnode/vnode/src/tq/tq.c
+++ b/source/dnode/vnode/src/tq/tq.c
@@ -79,6 +79,10 @@ STQ* tqOpen(const char* path, SVnode* pVnode) {
     ASSERT(0);
   }
 
+  if (streamLoadTasks(pTq->pStreamMeta) < 0) {
+    ASSERT(0);
+  }
+
   return pTq;
 }
 
@@ -648,17 +652,28 @@ int32_t tqExpandTask(STQ* pTq, SStreamTask* pTask) {
 
   // expand executor
   if (pTask->taskLevel == TASK_LEVEL__SOURCE) {
+    pTask->pState = streamStateOpen(pTq->pStreamMeta->path, pTask);
+    if (pTask->pState == NULL) {
+      return -1;
+    }
+
     SReadHandle handle = {
         .meta = pTq->pVnode->pMeta,
         .vnode = pTq->pVnode,
         .initTqReader = 1,
+        .pStateBackend = pTask->pState,
     };
     pTask->exec.executor = qCreateStreamExecTaskInfo(pTask->exec.qmsg, &handle);
     ASSERT(pTask->exec.executor);
   } else if (pTask->taskLevel == TASK_LEVEL__AGG) {
+    pTask->pState = streamStateOpen(pTq->pStreamMeta->path, pTask);
+    if (pTask->pState == NULL) {
+      return -1;
+    }
     SReadHandle mgHandle = {
         .vnode = NULL,
         .numOfVgroups = (int32_t)taosArrayGetSize(pTask->childEpInfo),
+        .pStateBackend = pTask->pState,
     };
     pTask->exec.executor = qCreateStreamExecTaskInfo(pTask->exec.qmsg, &mgHandle);
     ASSERT(pTask->exec.executor);
diff --git a/source/libs/executor/inc/executorimpl.h b/source/libs/executor/inc/executorimpl.h
index 601c22a3ba..67f7cb2f6f 100644
--- a/source/libs/executor/inc/executorimpl.h
+++ b/source/libs/executor/inc/executorimpl.h
@@ -150,6 +150,7 @@ typedef struct {
   SQueryTableDataCond tableCond;
   int64_t recoverStartVer;
   int64_t recoverEndVer;
+  SStreamState* pState;
 } SStreamTaskInfo;
 
 typedef struct {
diff --git a/source/libs/executor/src/executorimpl.c b/source/libs/executor/src/executorimpl.c
index 1836ca6d9b..98c7c56d72 100644
--- a/source/libs/executor/src/executorimpl.c
+++ b/source/libs/executor/src/executorimpl.c
@@ -392,7 +392,7 @@ static void functionCtxSave(SqlFunctionCtx* pCtx, SFunctionCtxStatus* pStatus) {
 
 static void functionCtxRestore(SqlFunctionCtx* pCtx, SFunctionCtxStatus* pStatus) {
   pCtx->input.colDataAggIsSet = pStatus->hasAgg;
-  pCtx->input.numOfRows  = pStatus->numOfRows;
+  pCtx->input.numOfRows = pStatus->numOfRows;
   pCtx->input.startRowIndex = pStatus->startOffset;
 }
 
@@ -3715,7 +3715,7 @@ static int32_t initFillInfo(SFillOperatorInfo* pInfo, SExprInfo* pExpr, int32_t
                             const char* id, SInterval* pInterval, int32_t fillType, int32_t order) {
   SFillColInfo* pColInfo = createFillColInfo(pExpr, numOfCols, pNotFillExpr, numOfNotFillCols, pValNode);
 
-  int64_t startKey = (order == TSDB_ORDER_ASC) ? win.skey : win.ekey;
+  int64_t     startKey = (order == TSDB_ORDER_ASC) ? win.skey : win.ekey;
   STimeWindow w = getAlignQueryTimeWindow(pInterval, pInterval->precision, startKey);
   w = getFirstQualifiedTimeWindow(startKey, &w, pInterval, order);
 
@@ -3988,15 +3988,15 @@ int32_t generateGroupIdMap(STableListInfo* pTableListInfo, SReadHandle* pHandle,
 
   bool assignUid = groupbyTbname(group);
 
-  size_t  numOfTables = taosArrayGetSize(pTableListInfo->pTableList);
+  size_t numOfTables = taosArrayGetSize(pTableListInfo->pTableList);
 
-  if(assignUid){
+  if (assignUid) {
     for (int32_t i = 0; i < numOfTables; i++) {
       STableKeyInfo* info = taosArrayGet(pTableListInfo->pTableList, i);
       info->groupId = info->uid;
       taosHashPut(pTableListInfo->map, &(info->uid), sizeof(uint64_t), &info->groupId, sizeof(uint64_t));
     }
-  }else{
+  } else {
     int32_t code = getColInfoResultForGroupby(pHandle->meta, group, pTableListInfo);
     if (code != TSDB_CODE_SUCCESS) {
       return code;
@@ -4615,6 +4615,10 @@ int32_t createExecTaskInfoImpl(SSubplan* pPlan, SExecTaskInfo** pTaskInfo, SRead
     goto _complete;
   }
 
+  if (pHandle && pHandle->pStateBackend) {
+    (*pTaskInfo)->streamInfo.pState = pHandle->pStateBackend;
+  }
+
   (*pTaskInfo)->sql = sql;
   sql = NULL;
   (*pTaskInfo)->pSubplan = pPlan;
diff --git a/source/libs/executor/src/scanoperator.c b/source/libs/executor/src/scanoperator.c
index 599f86f4fa..3eb382522a 100644
--- a/source/libs/executor/src/scanoperator.c
+++ b/source/libs/executor/src/scanoperator.c
@@ -1281,6 +1281,42 @@ static SSDataBlock* doStreamScan(SOperatorInfo* pOperator) {
   SExecTaskInfo*   pTaskInfo = pOperator->pTaskInfo;
   SStreamScanInfo* pInfo = pOperator->info;
 
+#if 0
+  SStreamState* pState = pTaskInfo->streamInfo.pState;
+  if (pState) {
+    printf(">>>>>>>> stream write backend\n");
+    SWinKey key = {
+        .ts = 1,
+        .groupId = 2,
+    };
+    char tmp[100] = "abcdefg1";
+    if (streamStatePut(pState, &key, &tmp, strlen(tmp) + 1) < 0) {
+      ASSERT(0);
+    }
+
+    key.ts = 2;
+    char tmp2[100] = "abcdefg2";
+    if (streamStatePut(pState, &key, &tmp2, strlen(tmp2) + 1) < 0) {
+      ASSERT(0);
+    }
+
+    key.groupId = 5;
+    key.ts = 1;
+    char tmp3[100] = "abcdefg3";
+    if (streamStatePut(pState, &key, &tmp3, strlen(tmp3) + 1) < 0) {
+      ASSERT(0);
+    }
+
+    char*   val2 = NULL;
+    int32_t sz;
+    if (streamStateGet(pState, &key, (void**)&val2, &sz) < 0) {
+      ASSERT(0);
+    }
+    printf("stream read %s %d\n", val2, sz);
+    streamFreeVal(val2);
+  }
+#endif
+
   qDebug("stream scan called");
   if (pTaskInfo->streamInfo.prepareStatus.type == TMQ_OFFSET__LOG) {
     while (1) {
diff --git a/source/libs/executor/src/timewindowoperator.c b/source/libs/executor/src/timewindowoperator.c
index 551180f639..ba0e534cc6 100644
--- a/source/libs/executor/src/timewindowoperator.c
+++ b/source/libs/executor/src/timewindowoperator.c
@@ -15,6 +15,7 @@
 #include "executorimpl.h"
 #include "function.h"
 #include "functionMgt.h"
+#include "tcommon.h"
 #include "tcompare.h"
 #include "tdatablock.h"
 #include "tfill.h"
@@ -27,11 +28,6 @@ typedef enum SResultTsInterpType {
 
 #define IS_FINAL_OP(op) ((op)->isFinal)
 
-typedef struct SWinRes {
-  TSKEY    ts;
-  uint64_t groupId;
-} SWinRes;
-
 typedef struct SPullWindowInfo {
   STimeWindow window;
   uint64_t    groupId;
@@ -641,7 +637,8 @@ static void doInterpUnclosedTimeWindow(SOperatorInfo* pOperatorInfo, int32_t num
     setResultRowInterpo(pResult, RESULT_ROW_END_INTERP);
     setNotInterpoWindowKey(pSup->pCtx, numOfExprs, RESULT_ROW_START_INTERP);
 
-    doApplyFunctions(pTaskInfo, pSup->pCtx, &pInfo->twAggSup.timeWindowData, startPos, 0, pBlock->info.rows, numOfExprs);
+    doApplyFunctions(pTaskInfo, pSup->pCtx, &pInfo->twAggSup.timeWindowData, startPos, 0, pBlock->info.rows,
+                     numOfExprs);
 
     if (isResultRowInterpolated(pResult, RESULT_ROW_END_INTERP)) {
       closeResultRow(pr);
@@ -812,7 +809,7 @@ static int32_t savePullWindow(SPullWindowInfo* pPullInfo, SArray* pPullWins) {
 int32_t compareResKey(void* pKey, void* data, int32_t index) {
   SArray*     res = (SArray*)data;
   SResKeyPos* pos = taosArrayGetP(res, index);
-  SWinRes*    pData = (SWinRes*)pKey;
+  SWinKey*    pData = (SWinKey*)pKey;
   if (pData->ts == *(int64_t*)pos->key) {
     if (pData->groupId > pos->groupId) {
       return 1;
@@ -828,7 +825,7 @@ int32_t compareResKey(void* pKey, void* data, int32_t index) {
 
 static int32_t saveResult(int64_t ts, int32_t pageId, int32_t offset, uint64_t groupId, SArray* pUpdated) {
   int32_t size = taosArrayGetSize(pUpdated);
-  SWinRes data = {.ts = ts, .groupId = groupId};
+  SWinKey data = {.ts = ts, .groupId = groupId};
   int32_t index = binarySearchCom(pUpdated, size, &data, TSDB_ORDER_DESC, compareResKey);
   if (index == -1) {
     index = 0;
@@ -861,8 +858,8 @@ static int32_t saveWinResult(int64_t ts, int32_t pageId, int32_t offset, uint64_
   newPos->groupId = groupId;
   newPos->pos = (SResultRowPosition){.pageId = pageId, .offset = offset};
   *(int64_t*)newPos->key = ts;
-  SWinRes key = {.ts = ts, .groupId = groupId};
-  if (taosHashPut(pUpdatedMap, &key, sizeof(SWinRes), &newPos, sizeof(void*)) != TSDB_CODE_SUCCESS) {
+  SWinKey key = {.ts = ts, .groupId = groupId};
+  if (taosHashPut(pUpdatedMap, &key, sizeof(SWinKey), &newPos, sizeof(void*)) != TSDB_CODE_SUCCESS) {
     taosMemoryFree(newPos);
   }
   return TSDB_CODE_SUCCESS;
@@ -879,20 +876,20 @@ static int32_t saveResultRow(SResultRow* result, uint64_t groupId, SArray* pUpda
 static void removeResults(SArray* pWins, SHashObj* pUpdatedMap) {
   int32_t size = taosArrayGetSize(pWins);
   for (int32_t i = 0; i < size; i++) {
-    SWinRes* pW = taosArrayGet(pWins, i);
-    taosHashRemove(pUpdatedMap, pW, sizeof(SWinRes));
+    SWinKey* pW = taosArrayGet(pWins, i);
+    taosHashRemove(pUpdatedMap, pW, sizeof(SWinKey));
   }
 }
 
 int64_t getWinReskey(void* data, int32_t index) {
   SArray*  res = (SArray*)data;
-  SWinRes* pos = taosArrayGet(res, index);
+  SWinKey* pos = taosArrayGet(res, index);
   return pos->ts;
 }
 
 int32_t compareWinRes(void* pKey, void* data, int32_t index) {
   SArray*     res = (SArray*)data;
-  SWinRes*    pos = taosArrayGetP(res, index);
+  SWinKey*    pos = taosArrayGetP(res, index);
   SResKeyPos* pData = (SResKeyPos*)pKey;
   if (*(int64_t*)pData->key == pos->ts) {
     if (pData->groupId > pos->groupId) {
@@ -985,8 +982,8 @@ static void hashIntervalAgg(SOperatorInfo* pOperatorInfo, SResultRowInfo* pResul
   if ((!pInfo->ignoreExpiredData || !isCloseWindow(&win, &pInfo->twAggSup)) &&
       inSlidingWindow(&pInfo->interval, &win, &pBlock->info)) {
     updateTimeWindowInfo(&pInfo->twAggSup.timeWindowData, &win, true);
-    doApplyFunctions(pTaskInfo, pSup->pCtx, &pInfo->twAggSup.timeWindowData, startPos, forwardRows,
-                     pBlock->info.rows, numOfOutput);
+    doApplyFunctions(pTaskInfo, pSup->pCtx, &pInfo->twAggSup.timeWindowData, startPos, forwardRows, pBlock->info.rows,
+                     numOfOutput);
   }
 
   doCloseWindow(pResultRowInfo, pInfo, pResult);
@@ -1025,8 +1022,8 @@ static void hashIntervalAgg(SOperatorInfo* pOperatorInfo, SResultRowInfo* pResul
     doWindowBorderInterpolation(pInfo, pBlock, pResult, &nextWin, startPos, forwardRows, pSup);
 
     updateTimeWindowInfo(&pInfo->twAggSup.timeWindowData, &nextWin, true);
-    doApplyFunctions(pTaskInfo, pSup->pCtx, &pInfo->twAggSup.timeWindowData, startPos, forwardRows,
-                     pBlock->info.rows, numOfOutput);
+    doApplyFunctions(pTaskInfo, pSup->pCtx, &pInfo->twAggSup.timeWindowData, startPos, forwardRows, pBlock->info.rows,
+                     numOfOutput);
     doCloseWindow(pResultRowInfo, pInfo, pResult);
   }
 
@@ -1214,8 +1211,8 @@ static void doStateWindowAggImpl(SOperatorInfo* pOperator, SStateWindowOperatorI
   }
 
   updateTimeWindowInfo(&pInfo->twAggSup.timeWindowData, &pRowSup->win, false);
-  doApplyFunctions(pTaskInfo, pSup->pCtx, &pInfo->twAggSup.timeWindowData, pRowSup->startRowIndex,
-                   pRowSup->numOfRows, pBlock->info.rows, numOfOutput);
+  doApplyFunctions(pTaskInfo, pSup->pCtx, &pInfo->twAggSup.timeWindowData, pRowSup->startRowIndex, pRowSup->numOfRows,
+                   pBlock->info.rows, numOfOutput);
 }
 
 static SSDataBlock* doStateWindowAgg(SOperatorInfo* pOperator) {
@@ -1418,7 +1415,7 @@ void doDeleteSpecifyIntervalWindow(SAggSupporter* pAggSup, SSDataBlock* pBlock,
     STimeWindow win = getActiveTimeWindow(NULL, &dumyInfo, tsStarts[i], pInterval, TSDB_ORDER_ASC);
     doDeleteIntervalWindow(pAggSup, win.skey, groupIds[i]);
     if (pUpWins) {
-      SWinRes winRes = {.ts = win.skey, .groupId = groupIds[i]};
+      SWinKey winRes = {.ts = win.skey, .groupId = groupIds[i]};
       taosArrayPush(pUpWins, &winRes);
     }
   }
@@ -1445,7 +1442,7 @@ static void doClearWindows(SAggSupporter* pAggSup, SExprSupp* pSup1, SInterval*
       uint64_t winGpId = pGpDatas ? pGpDatas[startPos] : pBlock->info.groupId;
       bool     res = doClearWindow(pAggSup, pSup1, (char*)&win.skey, sizeof(TSKEY), winGpId, numOfOutput);
       if (pUpWins && res) {
-        SWinRes winRes = {.ts = win.skey, .groupId = winGpId};
+        SWinKey winRes = {.ts = win.skey, .groupId = winGpId};
         taosArrayPush(pUpWins, &winRes);
       }
       getNextTimeWindow(pInterval, pInterval->precision, TSDB_ORDER_ASC, &win);
@@ -1484,11 +1481,11 @@ static int32_t closeIntervalWindow(SHashObj* pHashMap, STimeWindowAggSupp* pSup,
     STimeWindow win;
     win.skey = ts;
     win.ekey = taosTimeAdd(win.skey, pInterval->interval, pInterval->intervalUnit, pInterval->precision) - 1;
-    SWinRes winRe = {
+    SWinKey winRe = {
         .ts = win.skey,
         .groupId = groupId,
     };
-    void* chIds = taosHashGet(pPullDataMap, &winRe, sizeof(SWinRes));
+    void* chIds = taosHashGet(pPullDataMap, &winRe, sizeof(SWinKey));
     if (isCloseWindow(&win, pSup)) {
       if (chIds && pPullDataMap) {
         SArray* chAy = *(SArray**)chIds;
@@ -1555,7 +1552,7 @@ static void doBuildDeleteResult(SArray* pWins, int32_t* index, SSDataBlock* pBlo
   SColumnInfoData* pTsCol = taosArrayGet(pBlock->pDataBlock, START_TS_COLUMN_INDEX);
   SColumnInfoData* pGroupCol = taosArrayGet(pBlock->pDataBlock, GROUPID_COLUMN_INDEX);
   for (int32_t i = *index; i < size; i++) {
-    SWinRes* pWin = taosArrayGet(pWins, i);
+    SWinKey* pWin = taosArrayGet(pWins, i);
     colDataAppend(pTsCol, pBlock->info.rows, (const char*)&pWin->ts, false);
     colDataAppend(pGroupCol, pBlock->info.rows, (const char*)&pWin->groupId, false);
     pBlock->info.rows++;
@@ -1595,6 +1592,9 @@ static SSDataBlock* doStreamIntervalAgg(SOperatorInfo* pOperator) {
   SArray*    pUpdated = taosArrayInit(4, POINTER_BYTES);  // SResKeyPos
   _hash_fn_t hashFn = taosGetDefaultHashFunction(TSDB_DATA_TYPE_BINARY);
   SHashObj*  pUpdatedMap = taosHashInit(1024, hashFn, false, HASH_NO_LOCK);
+
+  SStreamState* pState = pTaskInfo->streamInfo.pState;
+
   while (1) {
     SSDataBlock* pBlock = downstream->fpSet.getNextFn(downstream);
     if (pBlock == NULL) {
@@ -1639,6 +1639,35 @@ static SSDataBlock* doStreamIntervalAgg(SOperatorInfo* pOperator) {
     hashIntervalAgg(pOperator, &pInfo->binfo.resultRowInfo, pBlock, MAIN_SCAN, pUpdatedMap);
   }
 
+#if 0
+  if (pState) {
+    printf(">>>>>>>> stream read backend\n");
+    SWinKey key = {
+        .ts = 1,
+        .groupId = 2,
+    };
+    char*   val = NULL;
+    int32_t sz;
+    if (streamStateGet(pState, &key, (void**)&val, &sz) < 0) {
+      ASSERT(0);
+    }
+    printf("stream read %s %d\n", val, sz);
+    streamFreeVal(val);
+
+    SStreamStateCur* pCur = streamStateGetCur(pState, &key);
+    ASSERT(pCur);
+    while (streamStateCurNext(pState, pCur) == 0) {
+      SWinKey     key1;
+      const void* val1;
+      if (streamStateGetKVByCur(pCur, &key1, &val1, &sz) < 0) {
+        break;
+      }
+      printf("stream iter key groupId:%d ts:%d, value %s %d\n", key1.groupId, key1.ts, val1, sz);
+    }
+    streamStateFreeCur(pCur);
+  }
+#endif
+
   pOperator->status = OP_RES_TO_RETURN;
   closeIntervalWindow(pInfo->aggSup.pResultRowHashTable, &pInfo->twAggSup, &pInfo->interval, NULL, pUpdatedMap,
                       pInfo->pRecycledPages, pInfo->aggSup.pResultBuf);
@@ -1857,7 +1886,7 @@ SOperatorInfo* createIntervalOperatorInfo(SOperatorInfo* downstream, SExprInfo*
     }
   }
   pInfo->pRecycledPages = taosArrayInit(4, sizeof(int32_t));
-  pInfo->pDelWins = taosArrayInit(4, sizeof(SWinRes));
+  pInfo->pDelWins = taosArrayInit(4, sizeof(SWinKey));
   pInfo->delIndex = 0;
   pInfo->pDelRes = createSpecialDataBlock(STREAM_DELETE_RESULT);
   initResultRowInfo(&pInfo->binfo.resultRowInfo);
@@ -1958,8 +1987,8 @@ static void doSessionWindowAggImpl(SOperatorInfo* pOperator, SSessionAggOperator
   }
 
   updateTimeWindowInfo(&pInfo->twAggSup.timeWindowData, &pRowSup->win, false);
-  doApplyFunctions(pTaskInfo, pSup->pCtx, &pInfo->twAggSup.timeWindowData, pRowSup->startRowIndex,
-                   pRowSup->numOfRows, pBlock->info.rows, numOfOutput);
+  doApplyFunctions(pTaskInfo, pSup->pCtx, &pInfo->twAggSup.timeWindowData, pRowSup->startRowIndex, pRowSup->numOfRows,
+                   pBlock->info.rows, numOfOutput);
 }
 
 static SSDataBlock* doSessionWindowAgg(SOperatorInfo* pOperator) {
@@ -2811,7 +2840,7 @@ static void rebuildIntervalWindow(SStreamFinalIntervalOperatorInfo* pInfo, SExpr
     return;
   }
   for (int32_t i = 0; i < size; i++) {
-    SWinRes*    pWinRes = taosArrayGet(pWinArray, i);
+    SWinKey*    pWinRes = taosArrayGet(pWinArray, i);
     SResultRow* pCurResult = NULL;
     STimeWindow ParentWin = {.skey = pWinRes->ts, .ekey = pWinRes->ts + 1};
     setTimeWindowOutputBuf(&pInfo->binfo.resultRowInfo, &ParentWin, true, &pCurResult, pWinRes->groupId, pSup->pCtx,
@@ -2854,12 +2883,12 @@ int32_t getNexWindowPos(SInterval* pInterval, SDataBlockInfo* pBlockInfo, TSKEY*
   return getNextQualifiedWindow(pInterval, pNextWin, pBlockInfo, tsCols, prevEndPos, TSDB_ORDER_ASC);
 }
 
-void addPullWindow(SHashObj* pMap, SWinRes* pWinRes, int32_t size) {
+void addPullWindow(SHashObj* pMap, SWinKey* pWinRes, int32_t size) {
   SArray* childIds = taosArrayInit(8, sizeof(int32_t));
   for (int32_t i = 0; i < size; i++) {
     taosArrayPush(childIds, &i);
   }
-  taosHashPut(pMap, pWinRes, sizeof(SWinRes), &childIds, sizeof(void*));
+  taosHashPut(pMap, pWinRes, sizeof(SWinKey), &childIds, sizeof(void*));
 }
 
 static int32_t getChildIndex(SSDataBlock* pBlock) { return pBlock->info.childId; }
@@ -2906,11 +2935,11 @@ static void doHashInterval(SOperatorInfo* pOperatorInfo, SSDataBlock* pSDataBloc
     }
     if (IS_FINAL_OP(pInfo) && isClosed && pInfo->pChildren) {
       bool    ignore = true;
-      SWinRes winRes = {
+      SWinKey winRes = {
           .ts = nextWin.skey,
           .groupId = tableGroupId,
       };
-      void* chIds = taosHashGet(pInfo->pPullDataMap, &winRes, sizeof(SWinRes));
+      void* chIds = taosHashGet(pInfo->pPullDataMap, &winRes, sizeof(SWinKey));
       if (isDeletedWindow(&nextWin, tableGroupId, &pInfo->aggSup) && !chIds) {
         SPullWindowInfo pull = {.window = nextWin, .groupId = tableGroupId};
         // add pull data request
@@ -3038,8 +3067,8 @@ void processPullOver(SSDataBlock* pBlock, SHashObj* pMap) {
   uint64_t*        groupIdData = (uint64_t*)pGroupCol->pData;
   int32_t          chId = getChildIndex(pBlock);
   for (int32_t i = 0; i < pBlock->info.rows; i++) {
-    SWinRes winRes = {.ts = tsData[i], .groupId = groupIdData[i]};
-    void*   chIds = taosHashGet(pMap, &winRes, sizeof(SWinRes));
+    SWinKey winRes = {.ts = tsData[i], .groupId = groupIdData[i]};
+    void*   chIds = taosHashGet(pMap, &winRes, sizeof(SWinKey));
     if (chIds) {
       SArray* chArray = *(SArray**)chIds;
       int32_t index = taosArraySearchIdx(chArray, &chId, compareInt32Val, TD_EQ);
@@ -3048,7 +3077,7 @@ void processPullOver(SSDataBlock* pBlock, SHashObj* pMap) {
         taosArrayRemove(chArray, index);
         if (taosArrayGetSize(chArray) == 0) {
           // pull data is over
-          taosHashRemove(pMap, &winRes, sizeof(SWinRes));
+          taosHashRemove(pMap, &winRes, sizeof(SWinKey));
         }
       }
     }
@@ -3128,11 +3157,11 @@ static SSDataBlock* doStreamFinalIntervalAgg(SOperatorInfo* pOperator) {
     maxTs = TMAX(maxTs, pBlock->info.window.ekey);
     maxTs = TMAX(maxTs, pBlock->info.watermark);
 
-    if (pBlock->info.type == STREAM_NORMAL || pBlock->info.type == STREAM_PULL_DATA ||
-        pBlock->info.type == STREAM_INVALID) {
+    ASSERT(pBlock->info.type != STREAM_INVERT);
+    if (pBlock->info.type == STREAM_NORMAL || pBlock->info.type == STREAM_PULL_DATA) {
       pInfo->binfo.pRes->info.type = pBlock->info.type;
     } else if (pBlock->info.type == STREAM_CLEAR) {
-      SArray* pUpWins = taosArrayInit(8, sizeof(SWinRes));
+      SArray* pUpWins = taosArrayInit(8, sizeof(SWinKey));
       doClearWindows(&pInfo->aggSup, pSup, &pInfo->interval, pOperator->exprSupp.numOfExprs, pBlock, pUpWins);
       if (IS_FINAL_OP(pInfo)) {
         int32_t                           childIndex = getChildIndex(pBlock);
@@ -3170,7 +3199,7 @@ static SSDataBlock* doStreamFinalIntervalAgg(SOperatorInfo* pOperator) {
       getAllIntervalWindow(pInfo->aggSup.pResultRowHashTable, pUpdatedMap);
       continue;
     } else if (pBlock->info.type == STREAM_RETRIEVE && !IS_FINAL_OP(pInfo)) {
-      SArray* pUpWins = taosArrayInit(8, sizeof(SWinRes));
+      SArray* pUpWins = taosArrayInit(8, sizeof(SWinKey));
       doClearWindows(&pInfo->aggSup, pSup, &pInfo->interval, pOperator->exprSupp.numOfExprs, pBlock, pUpWins);
       removeResults(pUpWins, pUpdatedMap);
       taosArrayDestroy(pUpWins);
@@ -3385,7 +3414,7 @@ SOperatorInfo* createStreamFinalIntervalOperatorInfo(SOperatorInfo* downstream,
   pInfo->ignoreExpiredData = pIntervalPhyNode->window.igExpired;
   pInfo->pDelRes = createSpecialDataBlock(STREAM_DELETE_RESULT);
   pInfo->delIndex = 0;
-  pInfo->pDelWins = taosArrayInit(4, sizeof(SWinRes));
+  pInfo->pDelWins = taosArrayInit(4, sizeof(SWinKey));
   pInfo->pRecycledPages = taosArrayInit(4, sizeof(int32_t));
 
   pOperator->operatorType = pPhyNode->type;
@@ -3720,8 +3749,8 @@ int32_t updateSessionWindowInfo(SResultWindowInfo* pWinInfo, TSKEY* pStartTs, TS
     }
     if (pWinInfo->win.skey > pStartTs[i]) {
       if (pStDeleted && pWinInfo->isOutput) {
-        SWinRes res = {.ts = pWinInfo->win.skey, .groupId = groupId};
-        taosHashPut(pStDeleted, &pWinInfo->pos, sizeof(SResultRowPosition), &res, sizeof(SWinRes));
+        SWinKey res = {.ts = pWinInfo->win.skey, .groupId = groupId};
+        taosHashPut(pStDeleted, &pWinInfo->pos, sizeof(SResultRowPosition), &res, sizeof(SWinKey));
         pWinInfo->isOutput = false;
       }
       pWinInfo->win.skey = pStartTs[i];
@@ -3839,8 +3868,8 @@ void compactTimeWindow(SStreamSessionAggOperatorInfo* pInfo, int32_t startIndex,
     compactFunctions(pSup->pCtx, pInfo->pDummyCtx, numOfOutput, pTaskInfo);
     taosHashRemove(pStUpdated, &pWinInfo->pos, sizeof(SResultRowPosition));
     if (pWinInfo->isOutput) {
-      SWinRes res = {.ts = pWinInfo->win.skey, .groupId = groupId};
-      taosHashPut(pStDeleted, &pWinInfo->pos, sizeof(SResultRowPosition), &res, sizeof(SWinRes));
+      SWinKey res = {.ts = pWinInfo->win.skey, .groupId = groupId};
+      taosHashPut(pStDeleted, &pWinInfo->pos, sizeof(SResultRowPosition), &res, sizeof(SWinKey));
       pWinInfo->isOutput = false;
     }
     taosArrayRemove(pInfo->streamAggSup.pCurWins, i);
@@ -3902,8 +3931,8 @@ static void doStreamSessionAggImpl(SOperatorInfo* pOperator, SSDataBlock* pSData
     }
     pCurWin->isClosed = false;
     if (pInfo->twAggSup.calTrigger == STREAM_TRIGGER_AT_ONCE && pStUpdated) {
-      SWinRes value = {.ts = pCurWin->win.skey, .groupId = groupId};
-      code = taosHashPut(pStUpdated, &pCurWin->pos, sizeof(SResultRowPosition), &value, sizeof(SWinRes));
+      SWinKey value = {.ts = pCurWin->win.skey, .groupId = groupId};
+      code = taosHashPut(pStUpdated, &pCurWin->pos, sizeof(SResultRowPosition), &value, sizeof(SWinKey));
       if (code != TSDB_CODE_SUCCESS) {
         longjmp(pTaskInfo->env, TSDB_CODE_QRY_OUT_OF_MEMORY);
       }
@@ -3955,8 +3984,7 @@ static void doClearSessionWindows(SStreamAggSupporter* pAggSup, SExprSupp* pSup,
   int32_t          step = 0;
   for (int32_t i = 0; i < pBlock->info.rows; i += step) {
     int32_t            winIndex = 0;
-    SResultWindowInfo* pCurWin =
-        getCurSessionWindow(pAggSup, tsCols[i], INT64_MIN, gpCols[i], gap, &winIndex);
+    SResultWindowInfo* pCurWin = getCurSessionWindow(pAggSup, tsCols[i], INT64_MIN, gpCols[i], gap, &winIndex);
     if (!pCurWin || pCurWin->pos.pageId == -1) {
       // window has been closed.
       step = 1;
@@ -3981,9 +4009,9 @@ static int32_t copyUpdateResult(SHashObj* pStUpdated, SArray* pUpdated) {
     if (pos == NULL) {
       return TSDB_CODE_QRY_OUT_OF_MEMORY;
     }
-    pos->groupId = ((SWinRes*)pData)->groupId;
+    pos->groupId = ((SWinKey*)pData)->groupId;
     pos->pos = *(SResultRowPosition*)key;
-    *(int64_t*)pos->key = ((SWinRes*)pData)->ts;
+    *(int64_t*)pos->key = ((SWinKey*)pData)->ts;
     taosArrayPush(pUpdated, &pos);
   }
   taosArraySort(pUpdated, resultrowComparAsc);
@@ -3999,7 +4027,7 @@ void doBuildDeleteDataBlock(SHashObj* pStDeleted, SSDataBlock* pBlock, void** It
   blockDataEnsureCapacity(pBlock, size);
   size_t keyLen = 0;
   while (((*Ite) = taosHashIterate(pStDeleted, *Ite)) != NULL) {
-    SWinRes*         res = *Ite;
+    SWinKey*         res = *Ite;
     SColumnInfoData* pTsCol = taosArrayGet(pBlock->pDataBlock, START_TS_COLUMN_INDEX);
     colDataAppend(pTsCol, pBlock->info.rows, (const char*)&res->ts, false);
     SColumnInfoData* pGpCol = taosArrayGet(pBlock->pDataBlock, GROUPID_COLUMN_INDEX);
@@ -4130,8 +4158,8 @@ static void copyDeleteWindowInfo(SArray* pResWins, SHashObj* pStDeleted) {
   int32_t size = taosArrayGetSize(pResWins);
   for (int32_t i = 0; i < size; i++) {
     SResultWindowInfo* pWinInfo = taosArrayGet(pResWins, i);
-    SWinRes            res = {.ts = pWinInfo->win.skey, .groupId = pWinInfo->groupId};
-    taosHashPut(pStDeleted, &pWinInfo->pos, sizeof(SResultRowPosition), &res, sizeof(SWinRes));
+    SWinKey            res = {.ts = pWinInfo->win.skey, .groupId = pWinInfo->groupId};
+    taosHashPut(pStDeleted, &pWinInfo->pos, sizeof(SResultRowPosition), &res, sizeof(SWinKey));
   }
 }
 
@@ -4169,14 +4197,14 @@ static SSDataBlock* doStreamSessionAgg(SOperatorInfo* pOperator) {
 
     if (pBlock->info.type == STREAM_CLEAR) {
       SArray* pWins = taosArrayInit(16, sizeof(SResultWindowInfo));
-      doClearSessionWindows(&pInfo->streamAggSup, &pOperator->exprSupp, pBlock, START_TS_COLUMN_INDEX, pOperator->exprSupp.numOfExprs, 0,
-                            pWins);
+      doClearSessionWindows(&pInfo->streamAggSup, &pOperator->exprSupp, pBlock, START_TS_COLUMN_INDEX,
+                            pOperator->exprSupp.numOfExprs, 0, pWins);
       if (IS_FINAL_OP(pInfo)) {
         int32_t                        childIndex = getChildIndex(pBlock);
         SOperatorInfo*                 pChildOp = taosArrayGetP(pInfo->pChildren, childIndex);
         SStreamSessionAggOperatorInfo* pChildInfo = pChildOp->info;
-        doClearSessionWindows(&pChildInfo->streamAggSup, &pChildOp->exprSupp, pBlock, START_TS_COLUMN_INDEX, pChildOp->exprSupp.numOfExprs,
-                              0, NULL);
+        doClearSessionWindows(&pChildInfo->streamAggSup, &pChildOp->exprSupp, pBlock, START_TS_COLUMN_INDEX,
+                              pChildOp->exprSupp.numOfExprs, 0, NULL);
         rebuildTimeWindow(pInfo, pWins, pBlock->info.groupId, pOperator->exprSupp.numOfExprs, pOperator);
       }
       taosArrayDestroy(pWins);
@@ -4578,7 +4606,8 @@ SStateWindowInfo* getStateWindow(SStreamAggSupporter* pAggSup, TSKEY ts, uint64_
 }
 
 int32_t updateStateWindowInfo(SArray* pWinInfos, int32_t winIndex, TSKEY* pTs, uint64_t groupId,
-    SColumnInfoData* pKeyCol, int32_t rows, int32_t start, bool* allEqual, SHashObj* pSeDeleted) {
+                              SColumnInfoData* pKeyCol, int32_t rows, int32_t start, bool* allEqual,
+                              SHashObj* pSeDeleted) {
   *allEqual = true;
   SStateWindowInfo* pWinInfo = taosArrayGet(pWinInfos, winIndex);
   for (int32_t i = start; i < rows; ++i) {
@@ -4599,9 +4628,8 @@ int32_t updateStateWindowInfo(SArray* pWinInfos, int32_t winIndex, TSKEY* pTs, u
     }
     if (pWinInfo->winInfo.win.skey > pTs[i]) {
       if (pSeDeleted && pWinInfo->winInfo.isOutput) {
-        SWinRes res = {.ts = pWinInfo->winInfo.win.skey, .groupId = groupId};
-        taosHashPut(pSeDeleted, &pWinInfo->winInfo.pos, sizeof(SResultRowPosition), &res,
-                    sizeof(SWinRes));
+        SWinKey res = {.ts = pWinInfo->winInfo.win.skey, .groupId = groupId};
+        taosHashPut(pSeDeleted, &pWinInfo->winInfo.pos, sizeof(SResultRowPosition), &res, sizeof(SWinKey));
         pWinInfo->winInfo.isOutput = false;
       }
       pWinInfo->winInfo.win.skey = pTs[i];
@@ -4614,14 +4642,14 @@ int32_t updateStateWindowInfo(SArray* pWinInfos, int32_t winIndex, TSKEY* pTs, u
   return rows - start;
 }
 
-static void doClearStateWindows(SStreamAggSupporter* pAggSup, SSDataBlock* pBlock,
-    SHashObj* pSeUpdated, SHashObj* pSeDeleted) {
+static void doClearStateWindows(SStreamAggSupporter* pAggSup, SSDataBlock* pBlock, SHashObj* pSeUpdated,
+                                SHashObj* pSeDeleted) {
   SColumnInfoData* pTsColInfo = taosArrayGet(pBlock->pDataBlock, START_TS_COLUMN_INDEX);
   SColumnInfoData* pGroupColInfo = taosArrayGet(pBlock->pDataBlock, GROUPID_COLUMN_INDEX);
   TSKEY*           tsCol = (TSKEY*)pTsColInfo->pData;
   bool             allEqual = false;
   int32_t          step = 1;
-  uint64_t*        gpCol = (uint64_t*) pGroupColInfo->pData;
+  uint64_t*        gpCol = (uint64_t*)pGroupColInfo->pData;
   for (int32_t i = 0; i < pBlock->info.rows; i += step) {
     int32_t           winIndex = 0;
     SStateWindowInfo* pCurWin = getStateWindowByTs(pAggSup, tsCol[i], gpCol[i], &winIndex);
@@ -4665,13 +4693,12 @@ static void doStreamStateAggImpl(SOperatorInfo* pOperator, SSDataBlock* pSDataBl
     char*             pKeyData = colDataGetData(pKeyColInfo, i);
     int32_t           winIndex = 0;
     bool              allEqual = true;
-    SStateWindowInfo* pCurWin =
-        getStateWindow(pAggSup, tsCols[i], groupId, pKeyData, &pInfo->stateCol, &winIndex);
-    winRows = updateStateWindowInfo(pAggSup->pCurWins, winIndex, tsCols, groupId, pKeyColInfo,
-        pSDataBlock->info.rows, i, &allEqual, pStDeleted);
+    SStateWindowInfo* pCurWin = getStateWindow(pAggSup, tsCols[i], groupId, pKeyData, &pInfo->stateCol, &winIndex);
+    winRows = updateStateWindowInfo(pAggSup->pCurWins, winIndex, tsCols, groupId, pKeyColInfo, pSDataBlock->info.rows,
+                                    i, &allEqual, pStDeleted);
     if (!allEqual) {
-      appendOneRow(pAggSup->pScanBlock, &pCurWin->winInfo.win.skey, &pCurWin->winInfo.win.ekey,
-                   GROUPID_COLUMN_INDEX, &groupId);
+      appendOneRow(pAggSup->pScanBlock, &pCurWin->winInfo.win.skey, &pCurWin->winInfo.win.ekey, GROUPID_COLUMN_INDEX,
+                   &groupId);
       taosHashRemove(pSeUpdated, &pCurWin->winInfo.pos, sizeof(SResultRowPosition));
       deleteWindow(pAggSup->pCurWins, winIndex, destroyStateWinInfo);
       continue;
@@ -4682,8 +4709,8 @@ static void doStreamStateAggImpl(SOperatorInfo* pOperator, SSDataBlock* pSDataBl
     }
     pCurWin->winInfo.isClosed = false;
     if (pInfo->twAggSup.calTrigger == STREAM_TRIGGER_AT_ONCE) {
-      SWinRes value = {.ts = pCurWin->winInfo.win.skey, .groupId = groupId};
-      code = taosHashPut(pSeUpdated, &pCurWin->winInfo.pos, sizeof(SResultRowPosition), &value, sizeof(SWinRes));
+      SWinKey value = {.ts = pCurWin->winInfo.win.skey, .groupId = groupId};
+      code = taosHashPut(pSeUpdated, &pCurWin->winInfo.pos, sizeof(SResultRowPosition), &value, sizeof(SWinKey));
       if (code != TSDB_CODE_SUCCESS) {
         longjmp(pTaskInfo->env, TSDB_CODE_QRY_OUT_OF_MEMORY);
       }
diff --git a/source/libs/stream/src/streamDispatch.c b/source/libs/stream/src/streamDispatch.c
index c78ff0756f..9d4010f60e 100644
--- a/source/libs/stream/src/streamDispatch.c
+++ b/source/libs/stream/src/streamDispatch.c
@@ -358,7 +358,7 @@ int32_t streamDispatchAllBlocks(SStreamTask* pTask, const SStreamDataBlock* pDat
   FAIL_SHUFFLE_DISPATCH:
     if (pReqs) {
       for (int32_t i = 0; i < vgSz; i++) {
-        taosArrayDestroy(pReqs[i].data);
+        taosArrayDestroyP(pReqs[i].data, taosMemoryFree);
         taosArrayDestroy(pReqs[i].dataLen);
       }
       taosMemoryFree(pReqs);
diff --git a/source/libs/stream/src/streamExec.c b/source/libs/stream/src/streamExec.c
index 06ca26f029..102bad7426 100644
--- a/source/libs/stream/src/streamExec.c
+++ b/source/libs/stream/src/streamExec.c
@@ -140,7 +140,6 @@ int32_t streamPipelineExec(SStreamTask* pTask, int32_t batchNum, bool dispatch)
   return 0;
 }
 
-// TODO: handle version
 int32_t streamExecForAll(SStreamTask* pTask) {
   while (1) {
     int32_t batchCnt = 1;
diff --git a/source/libs/stream/src/streamMeta.c b/source/libs/stream/src/streamMeta.c
index 5ff700546c..20a2f7d332 100644
--- a/source/libs/stream/src/streamMeta.c
+++ b/source/libs/stream/src/streamMeta.c
@@ -14,7 +14,7 @@
  */
 
 #include "executor.h"
-#include "tstream.h"
+#include "streamInc.h"
 #include "ttimer.h"
 
 SStreamMeta* streamMetaOpen(const char* path, void* ahandle, FTaskExpand expandFunc) {
@@ -23,17 +23,23 @@ SStreamMeta* streamMetaOpen(const char* path, void* ahandle, FTaskExpand expandF
     terrno = TSDB_CODE_OUT_OF_MEMORY;
     return NULL;
   }
-  pMeta->path = strdup(path);
+  int32_t len = strlen(path) + 20;
+  char*   streamPath = taosMemoryCalloc(1, len);
+  sprintf(streamPath, "%s/%s", path, "stream");
+  pMeta->path = strdup(streamPath);
   if (tdbOpen(pMeta->path, 16 * 1024, 1, &pMeta->db) < 0) {
     goto _err;
   }
 
+  sprintf(streamPath, "%s/%s", pMeta->path, "checkpoints");
+  mkdir(streamPath, 0755);
+  taosMemoryFree(streamPath);
+
   if (tdbTbOpen("task.db", sizeof(int32_t), -1, NULL, pMeta->db, &pMeta->pTaskDb) < 0) {
     goto _err;
   }
 
-  // open state storage backend
-  if (tdbTbOpen("state.db", sizeof(int32_t), -1, NULL, pMeta->db, &pMeta->pStateDb) < 0) {
+  if (tdbTbOpen("checkpoint.db", sizeof(int32_t), -1, NULL, pMeta->db, &pMeta->pCheckpointDb) < 0) {
     goto _err;
   }
 
@@ -49,16 +55,13 @@ SStreamMeta* streamMetaOpen(const char* path, void* ahandle, FTaskExpand expandF
   pMeta->ahandle = ahandle;
   pMeta->expandFunc = expandFunc;
 
-  if (streamLoadTasks(pMeta) < 0) {
-    goto _err;
-  }
   return pMeta;
 
 _err:
   if (pMeta->path) taosMemoryFree(pMeta->path);
   if (pMeta->pTasks) taosHashCleanup(pMeta->pTasks);
-  if (pMeta->pStateDb) tdbTbClose(pMeta->pStateDb);
   if (pMeta->pTaskDb) tdbTbClose(pMeta->pTaskDb);
+  if (pMeta->pCheckpointDb) tdbTbClose(pMeta->pCheckpointDb);
   if (pMeta->db) tdbClose(pMeta->db);
   taosMemoryFree(pMeta);
   return NULL;
@@ -67,7 +70,7 @@ _err:
 void streamMetaClose(SStreamMeta* pMeta) {
   tdbCommit(pMeta->db, &pMeta->txn);
   tdbTbClose(pMeta->pTaskDb);
-  tdbTbClose(pMeta->pStateDb);
+  tdbTbClose(pMeta->pCheckpointDb);
   tdbClose(pMeta->db);
 
   void* pIter = NULL;
diff --git a/source/libs/stream/src/streamRecover.c b/source/libs/stream/src/streamRecover.c
index 263053778b..0505c3edd6 100644
--- a/source/libs/stream/src/streamRecover.c
+++ b/source/libs/stream/src/streamRecover.c
@@ -176,6 +176,7 @@ int32_t tDecodeSStreamTaskRecoverRsp(SDecoder* pDecoder, SStreamRecoverDownstrea
 }
 
 int32_t streamSaveStateInfo(SStreamMeta* pMeta, SStreamTask* pTask) {
+#if 0
   void* buf = NULL;
 
   ASSERT(pTask->taskLevel == TASK_LEVEL__SINK);
@@ -224,10 +225,12 @@ int32_t streamSaveStateInfo(SStreamMeta* pMeta, SStreamTask* pTask) {
 FAIL:
   if (buf) taosMemoryFree(buf);
   return -1;
+#endif
   return 0;
 }
 
 int32_t streamLoadStateInfo(SStreamMeta* pMeta, SStreamTask* pTask) {
+#if 0
   void*   pVal = NULL;
   int32_t vLen = 0;
   if (tdbTbGet(pMeta->pStateDb, &pTask->taskId, sizeof(void*), &pVal, &vLen) < 0) {
@@ -241,7 +244,7 @@ int32_t streamLoadStateInfo(SStreamMeta* pMeta, SStreamTask* pTask) {
 
   pTask->nextCheckId = aggCheckpoint.checkpointId + 1;
   pTask->checkpointInfo = aggCheckpoint.checkpointVer;
-
+#endif
   return 0;
 }
 
diff --git a/source/libs/stream/src/streamState.c b/source/libs/stream/src/streamState.c
new file mode 100644
index 0000000000..dfd6f012cc
--- /dev/null
+++ b/source/libs/stream/src/streamState.c
@@ -0,0 +1,205 @@
+/*
+ * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
+ *
+ * This program is free software: you can use, redistribute, and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3
+ * or later ("AGPL"), as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "executor.h"
+#include "streamInc.h"
+#include "tcommon.h"
+#include "ttimer.h"
+
+SStreamState* streamStateOpen(char* path, SStreamTask* pTask) {
+  SStreamState* pState = taosMemoryCalloc(1, sizeof(SStreamState));
+  if (pState == NULL) {
+    terrno = TSDB_CODE_OUT_OF_MEMORY;
+    return NULL;
+  }
+  char statePath[300];
+  sprintf(statePath, "%s/%d", path, pTask->taskId);
+  if (tdbOpen(statePath, 4096, 256, &pState->db) < 0) {
+    goto _err;
+  }
+
+  // open state storage backend
+  if (tdbTbOpen("state.db", sizeof(SWinKey), -1, SWinKeyCmpr, pState->db, &pState->pStateDb) < 0) {
+    goto _err;
+  }
+
+  if (streamStateBegin(pState) < 0) {
+    goto _err;
+  }
+
+  pState->pOwner = pTask;
+
+  return pState;
+
+_err:
+  if (pState->pStateDb) tdbTbClose(pState->pStateDb);
+  if (pState->db) tdbClose(pState->db);
+  taosMemoryFree(pState);
+  return NULL;
+}
+
+void streamStateClose(SStreamState* pState) {
+  tdbCommit(pState->db, &pState->txn);
+  tdbTbClose(pState->pStateDb);
+  tdbClose(pState->db);
+
+  taosMemoryFree(pState);
+}
+
+int32_t streamStateBegin(SStreamState* pState) {
+  if (tdbTxnOpen(&pState->txn, 0, tdbDefaultMalloc, tdbDefaultFree, NULL, TDB_TXN_WRITE | TDB_TXN_READ_UNCOMMITTED) <
+      0) {
+    return -1;
+  }
+
+  if (tdbBegin(pState->db, &pState->txn) < 0) {
+    tdbTxnClose(&pState->txn);
+    return -1;
+  }
+  return 0;
+}
+
+int32_t streamStateCommit(SStreamState* pState) {
+  if (tdbCommit(pState->db, &pState->txn) < 0) {
+    return -1;
+  }
+  memset(&pState->txn, 0, sizeof(TXN));
+  if (tdbTxnOpen(&pState->txn, 0, tdbDefaultMalloc, tdbDefaultFree, NULL, TDB_TXN_WRITE | TDB_TXN_READ_UNCOMMITTED) <
+      0) {
+    return -1;
+  }
+  if (tdbBegin(pState->db, &pState->txn) < 0) {
+    return -1;
+  }
+  return 0;
+}
+
+int32_t streamStateAbort(SStreamState* pState) {
+  if (tdbAbort(pState->db, &pState->txn) < 0) {
+    return -1;
+  }
+  memset(&pState->txn, 0, sizeof(TXN));
+  if (tdbTxnOpen(&pState->txn, 0, tdbDefaultMalloc, tdbDefaultFree, NULL, TDB_TXN_WRITE | TDB_TXN_READ_UNCOMMITTED) <
+      0) {
+    return -1;
+  }
+  if (tdbBegin(pState->db, &pState->txn) < 0) {
+    return -1;
+  }
+  return 0;
+}
+
+int32_t streamStatePut(SStreamState* pState, const SWinKey* key, const void* value, int32_t vLen) {
+  return tdbTbUpsert(pState->pStateDb, key, sizeof(SWinKey), value, vLen, &pState->txn);
+}
+int32_t streamStateGet(SStreamState* pState, const SWinKey* key, void** pVal, int32_t* pVLen) {
+  return tdbTbGet(pState->pStateDb, key, sizeof(SWinKey), pVal, pVLen);
+}
+
+int32_t streamStateDel(SStreamState* pState, const SWinKey* key) {
+  return tdbTbDelete(pState->pStateDb, key, sizeof(SWinKey), &pState->txn);
+}
+
+SStreamStateCur* streamStateGetCur(SStreamState* pState, const SWinKey* key) {
+  SStreamStateCur* pCur = taosMemoryCalloc(1, sizeof(SStreamStateCur));
+  if (pCur == NULL) return NULL;
+  tdbTbcOpen(pState->pStateDb, &pCur->pCur, NULL);
+
+  int32_t c;
+  tdbTbcMoveTo(pCur->pCur, key, sizeof(SWinKey), &c);
+  if (c != 0) {
+    taosMemoryFree(pCur);
+    return NULL;
+  }
+  return pCur;
+}
+
+int32_t streamStateGetKVByCur(SStreamStateCur* pCur, SWinKey* pKey, const void** pVal, int32_t* pVLen) {
+  const SWinKey* pKTmp = NULL;
+  int32_t        kLen;
+  if (tdbTbcGet(pCur->pCur, (const void**)&pKTmp, &kLen, pVal, pVLen) < 0) {
+    return -1;
+  }
+  *pKey = *pKTmp;
+  return 0;
+}
+
+int32_t streamStateSeekFirst(SStreamState* pState, SStreamStateCur* pCur) {
+  //
+  return tdbTbcMoveToFirst(pCur->pCur);
+}
+
+int32_t streamStateSeekLast(SStreamState* pState, SStreamStateCur* pCur) {
+  //
+  return tdbTbcMoveToLast(pCur->pCur);
+}
+
+SStreamStateCur* streamStateSeekKeyNext(SStreamState* pState, const SWinKey* key) {
+  SStreamStateCur* pCur = taosMemoryCalloc(1, sizeof(SStreamStateCur));
+  if (pCur == NULL) {
+    return NULL;
+  }
+
+  int32_t c;
+  if (tdbTbcMoveTo(pCur->pCur, key, sizeof(SWinKey), &c) < 0) {
+    taosMemoryFree(pCur);
+    return NULL;
+  }
+  if (c > 0) return pCur;
+
+  if (tdbTbcMoveToNext(pCur->pCur) < 0) {
+    taosMemoryFree(pCur);
+    return NULL;
+  }
+
+  return pCur;
+}
+
+SStreamStateCur* streamStateSeekKeyPrev(SStreamState* pState, const SWinKey* key) {
+  SStreamStateCur* pCur = taosMemoryCalloc(1, sizeof(SStreamStateCur));
+  if (pCur == NULL) {
+    return NULL;
+  }
+
+  int32_t c;
+  if (tdbTbcMoveTo(pCur->pCur, key, sizeof(SWinKey), &c) < 0) {
+    taosMemoryFree(pCur);
+    return NULL;
+  }
+  if (c < 0) return pCur;
+
+  if (tdbTbcMoveToPrev(pCur->pCur) < 0) {
+    taosMemoryFree(pCur);
+    return NULL;
+  }
+
+  return pCur;
+}
+
+int32_t streamStateCurNext(SStreamState* pState, SStreamStateCur* pCur) {
+  //
+  return tdbTbcMoveToNext(pCur->pCur);
+}
+
+int32_t streamStateCurPrev(SStreamState* pState, SStreamStateCur* pCur) {
+  //
+  return tdbTbcMoveToPrev(pCur->pCur);
+}
+void streamStateFreeCur(SStreamStateCur* pCur) {
+  tdbTbcClose(pCur->pCur);
+  taosMemoryFree(pCur);
+}
+
+void streamFreeVal(void* val) { tdbFree(val); }
diff --git a/source/libs/stream/src/streamTask.c b/source/libs/stream/src/streamTask.c
index 4009a47c65..ce5917de29 100644
--- a/source/libs/stream/src/streamTask.c
+++ b/source/libs/stream/src/streamTask.c
@@ -165,5 +165,8 @@ void tFreeSStreamTask(SStreamTask* pTask) {
   if (pTask->outputType == TASK_OUTPUT__SHUFFLE_DISPATCH) {
     taosArrayDestroy(pTask->shuffleDispatcher.dbInfo.pVgroupInfos);
   }
+
+  if (pTask->pState) streamStateClose(pTask->pState);
+
   taosMemoryFree(pTask);
 }
diff --git a/source/libs/transport/src/transSvr.c b/source/libs/transport/src/transSvr.c
index 447db76136..6dd9481b95 100644
--- a/source/libs/transport/src/transSvr.c
+++ b/source/libs/transport/src/transSvr.c
@@ -276,7 +276,7 @@ void uvOnRecvCb(uv_stream_t* cli, ssize_t nread, const uv_buf_t* buf) {
       while (transReadComplete(pBuf)) {
         tTrace("%s conn %p alread read complete packet", transLabel(pTransInst), conn);
         if (true == pBuf->invalid || false == uvHandleReq(conn)) {
-          tError("%s conn %p read invalid packet", transLabel(pTransInst), conn);
+          tError("%s conn %p read invalid packet, dst: %s, srv: %s", transLabel(pTransInst), conn, conn->dst, conn->src);
           destroyConn(conn, true);
           return;
         }
diff --git a/source/libs/wal/src/walMeta.c b/source/libs/wal/src/walMeta.c
index a8da680910..93ced912f8 100644
--- a/source/libs/wal/src/walMeta.c
+++ b/source/libs/wal/src/walMeta.c
@@ -121,7 +121,7 @@ static FORCE_INLINE int64_t walScanLogGetLastVer(SWal* pWal) {
   if (found == NULL) {
     // file corrupted, no complete log
     // TODO delete and search in previous files
-    ASSERT(0);
+    /*ASSERT(0);*/
     terrno = TSDB_CODE_WAL_FILE_CORRUPTED;
     return -1;
   }
@@ -221,7 +221,6 @@ int walCheckAndRepairMeta(SWal* pWal) {
 
       int code = walSaveMeta(pWal);
       if (code < 0) {
-        taosArrayDestroy(actualLog);
         return -1;
       }
     }
diff --git a/tests/script/tsim/db/basic2.sim b/tests/script/tsim/db/basic2.sim
index b7ac0b5edd..4f0ba4a13c 100644
--- a/tests/script/tsim/db/basic2.sim
+++ b/tests/script/tsim/db/basic2.sim
@@ -4,7 +4,7 @@ system sh/exec.sh -n dnode1 -s start
 sql connect
 
 print =============== conflict stb
-sql create database db vgroups 1;
+sql create database db vgroups 4;
 sql use db;
 sql create table stb (ts timestamp, i int) tags (j int);
 sql_error create table stb using stb tags (1);
@@ -16,6 +16,9 @@ sql_error create table ctb (ts timestamp, i int) tags (j int);
 sql create table ntb (ts timestamp, i int);
 sql_error create table ntb (ts timestamp, i int) tags (j int);
 
+sql drop table ntb
+sql create table ntb (ts timestamp, i int) tags (j int);
+
 sql drop database db
 
 print =============== create database d1