diff --git a/source/libs/executor/inc/executorimpl.h b/source/libs/executor/inc/executorimpl.h
index de4e4dd1f84b6e56c896468b9d6cf6c97c592170..212a4aef54cfd25057a22b96c9b15a0d0b742f8d 100644
--- a/source/libs/executor/inc/executorimpl.h
+++ b/source/libs/executor/inc/executorimpl.h
@@ -818,6 +818,7 @@ typedef struct SStateWindowOperatorInfo {
   // SOptrBasicInfo should be first, SAggSupporter should be second for stream encode
   SOptrBasicInfo binfo;
   SAggSupporter  aggSup;
+  SExprSupp      scalarSup;
 
   SGroupResInfo      groupResInfo;
   SWindowRowsSup     winSup;
diff --git a/source/libs/executor/src/tfill.c b/source/libs/executor/src/tfill.c
index 34997a5dd83aa6612d985acb07c91f1c5655e40a..cf0bc078d7215eed3080d106428b272959382131 100644
--- a/source/libs/executor/src/tfill.c
+++ b/source/libs/executor/src/tfill.c
@@ -366,7 +366,6 @@ static int32_t fillResultImpl(SFillInfo* pFillInfo, SSDataBlock* pBlock, int32_t
       }
 
       // set the tag value for final result
-      //      setTagsValue(pFillInfo, data, pFillInfo->numOfCurrent);
       SInterval* pInterval = &pFillInfo->interval;
       pFillInfo->currentKey =
           taosTimeAdd(pFillInfo->currentKey, pInterval->sliding * step, pInterval->slidingUnit, pInterval->precision);
@@ -523,14 +522,6 @@ void* taosDestroyFillInfo(SFillInfo* pFillInfo) {
   return NULL;
 }
 
-void taosFillSetDataOrderInfo(SFillInfo* pFillInfo, int32_t order) {
-  if (pFillInfo == NULL || (order != TSDB_ORDER_ASC && order != TSDB_ORDER_DESC)) {
-    return;
-  }
-
-  pFillInfo->order = order;
-}
-
 void taosFillSetStartInfo(SFillInfo* pFillInfo, int32_t numOfRows, TSKEY endKey) {
   if (pFillInfo->type == TSDB_FILL_NONE) {
     return;
diff --git a/source/libs/executor/src/timewindowoperator.c b/source/libs/executor/src/timewindowoperator.c
index 69e1b66ecf80988eec1e0657357beacf6474252b..16d0c178e0f531613e7d65bb88e740e37a014a21 100644
--- a/source/libs/executor/src/timewindowoperator.c
+++ b/source/libs/executor/src/timewindowoperator.c
@@ -1218,39 +1218,17 @@ static void doStateWindowAggImpl(SOperatorInfo* pOperator, SStateWindowOperatorI
                    pBlock->info.rows, numOfOutput);
 }
 
-static SSDataBlock* doStateWindowAgg(SOperatorInfo* pOperator) {
-  if (pOperator->status == OP_EXEC_DONE) {
-    return NULL;
+static  int32_t openStateWindowAggOptr(SOperatorInfo* pOperator) {
+  if (OPTR_IS_OPENED(pOperator)) {
+    return TSDB_CODE_SUCCESS;
   }
 
   SStateWindowOperatorInfo* pInfo = pOperator->info;
+  SExecTaskInfo*            pTaskInfo = pOperator->pTaskInfo;
 
-  SExecTaskInfo* pTaskInfo = pOperator->pTaskInfo;
-  SExprSupp*     pSup = &pOperator->exprSupp;
-
-  SOptrBasicInfo* pBInfo = &pInfo->binfo;
-
-  if (pOperator->status == OP_RES_TO_RETURN) {
-    while (1) {
-      doBuildResultDatablock(pOperator, &pInfo->binfo, &pInfo->groupResInfo, pInfo->aggSup.pResultBuf);
-      doFilter(pInfo->pCondition, pBInfo->pRes, NULL);
-
-      bool hasRemain = hasRemainResults(&pInfo->groupResInfo);
-      if (!hasRemain) {
-        doSetOperatorCompleted(pOperator);
-        break;
-      }
-
-      if (pBInfo->pRes->info.rows > 0) {
-        break;
-      }
-    }
-    pOperator->resultInfo.totalRows += pBInfo->pRes->info.rows;
-    return (pBInfo->pRes->info.rows == 0) ? NULL : pBInfo->pRes;
-  }
-
-  int32_t order = TSDB_ORDER_ASC;
-  int64_t st = taosGetTimestampUs();
+  SExprSupp* pSup = &pOperator->exprSupp;
+  int32_t    order = TSDB_ORDER_ASC;
+  int64_t    st = taosGetTimestampUs();
 
   SOperatorInfo* downstream = pOperator->pDownstream[0];
   while (1) {
@@ -1262,13 +1240,40 @@ static SSDataBlock* doStateWindowAgg(SOperatorInfo* pOperator) {
     setInputDataBlock(pOperator, pSup->pCtx, pBlock, order, MAIN_SCAN, true);
     blockDataUpdateTsWindow(pBlock, pInfo->tsSlotId);
 
+    // there is an scalar expression that needs to be calculated right before apply the group aggregation.
+    if (pInfo->scalarSup.pExprInfo != NULL) {
+      pTaskInfo->code = projectApplyFunctions(pInfo->scalarSup.pExprInfo, pBlock, pBlock, pInfo->scalarSup.pCtx,
+                                              pInfo->scalarSup.numOfExprs, NULL);
+      if (pTaskInfo->code != TSDB_CODE_SUCCESS) {
+        T_LONG_JMP(pTaskInfo->env, pTaskInfo->code);
+      }
+    }
+
     doStateWindowAggImpl(pOperator, pInfo, pBlock);
   }
 
   pOperator->cost.openCost = (taosGetTimestampUs() - st) / 1000.0;
+  initGroupedResultInfo(&pInfo->groupResInfo, pInfo->aggSup.pResultRowHashTable, TSDB_ORDER_ASC);
   pOperator->status = OP_RES_TO_RETURN;
 
-  initGroupedResultInfo(&pInfo->groupResInfo, pInfo->aggSup.pResultRowHashTable, TSDB_ORDER_ASC);
+  return TSDB_CODE_SUCCESS;
+}
+
+static SSDataBlock* doStateWindowAgg(SOperatorInfo* pOperator) {
+  if (pOperator->status == OP_EXEC_DONE) {
+    return NULL;
+  }
+
+  SStateWindowOperatorInfo* pInfo = pOperator->info;
+  SExecTaskInfo*            pTaskInfo = pOperator->pTaskInfo;
+  SOptrBasicInfo*           pBInfo = &pInfo->binfo;
+
+  pTaskInfo->code = pOperator->fpSet._openFn(pOperator);
+  if (pTaskInfo->code != TSDB_CODE_SUCCESS) {
+    doSetOperatorCompleted(pOperator);
+    return NULL;
+  }
+
   blockDataEnsureCapacity(pBInfo->pRes, pOperator->resultInfo.capacity);
   while (1) {
     doBuildResultDatablock(pOperator, &pInfo->binfo, &pInfo->groupResInfo, pInfo->aggSup.pResultBuf);
@@ -1284,6 +1289,7 @@ static SSDataBlock* doStateWindowAgg(SOperatorInfo* pOperator) {
       break;
     }
   }
+
   pOperator->resultInfo.totalRows += pBInfo->pRes->info.rows;
   return (pBInfo->pRes->info.rows == 0) ? NULL : pBInfo->pRes;
 }
@@ -1716,6 +1722,7 @@ static void destroyStateWindowOperatorInfo(void* param) {
   SStateWindowOperatorInfo* pInfo = (SStateWindowOperatorInfo*)param;
   cleanupBasicInfo(&pInfo->binfo);
   taosMemoryFreeClear(pInfo->stateKey.pData);
+  cleanupExprSupp(&pInfo->scalarSup);
 
   taosMemoryFreeClear(param);
 }
@@ -2747,6 +2754,15 @@ SOperatorInfo* createStatewindowOperatorInfo(SOperatorInfo* downstream, SStateWi
 
   SColumnNode* pColNode = (SColumnNode*)((STargetNode*)pStateNode->pStateKey)->pExpr;
 
+  if (pStateNode->window.pExprs != NULL) {
+    int32_t    numOfScalarExpr = 0;
+    SExprInfo* pScalarExprInfo = createExprInfo(pStateNode->window.pExprs, NULL, &numOfScalarExpr);
+    int32_t code = initExprSupp(&pInfo->scalarSup, pScalarExprInfo, numOfScalarExpr);
+    if (code != TSDB_CODE_SUCCESS) {
+      goto _error;
+    }
+  }
+
   pInfo->stateCol = extractColumnFromColumnNode(pColNode);
   pInfo->stateKey.type = pInfo->stateCol.type;
   pInfo->stateKey.bytes = pInfo->stateCol.bytes;
@@ -2769,7 +2785,7 @@ SOperatorInfo* createStatewindowOperatorInfo(SOperatorInfo* downstream, SStateWi
 
   pInfo->twAggSup =
       (STimeWindowAggSupp){.waterMark = pStateNode->window.watermark, .calTrigger = pStateNode->window.triggerType};
-  ;
+
   initExecTimeWindowInfo(&pInfo->twAggSup.timeWindowData, &pTaskInfo->window);
 
   pInfo->tsSlotId = tsSlotId;
@@ -2780,7 +2796,7 @@ SOperatorInfo* createStatewindowOperatorInfo(SOperatorInfo* downstream, SStateWi
   pOperator->pTaskInfo = pTaskInfo;
   pOperator->info = pInfo;
 
-  pOperator->fpSet = createOperatorFpSet(operatorDummyOpenFn, doStateWindowAgg, NULL, NULL,
+  pOperator->fpSet = createOperatorFpSet(openStateWindowAggOptr, doStateWindowAgg, NULL, NULL,
                                          destroyStateWindowOperatorInfo, aggEncodeResultRow, aggDecodeResultRow, NULL);
 
   code = appendDownstream(pOperator, &downstream, 1);