diff --git a/source/libs/executor/inc/executorimpl.h b/source/libs/executor/inc/executorimpl.h
index bf9377c83d..ddd4e1e462 100644
--- a/source/libs/executor/inc/executorimpl.h
+++ b/source/libs/executor/inc/executorimpl.h
@@ -480,13 +480,14 @@ typedef struct STableIntervalOperatorInfo {
   SOptrBasicInfo     binfo;                // basic info
   SGroupResInfo      groupResInfo;         // multiple results build supporter
   SInterval          interval;             // interval info
+  int32_t            primaryTsIndex;       // primary time stamp slot id from result of downstream operator.
   STimeWindow        win;                  // query time range
   bool               timeWindowInterpo;    // interpolation needed or not
   char             **pRow;                 // previous row/tuple of already processed datablock
   SAggSupporter      aggSup;               // aggregate supporter
   STableQueryInfo   *pCurrent;             // current tableQueryInfo struct
   int32_t            order;                // current SSDataBlock scan order
-  EOPTR_EXEC_MODEL    execModel;            // operator execution model [batch model|stream model]
+  EOPTR_EXEC_MODEL   execModel;            // operator execution model [batch model|stream model]
   SArray            *pUpdatedWindow;       // updated time window due to the input data block from the downstream operator.
   SColumnInfoData    timeWindowData;       // query time window info for scalar function execution.
 } STableIntervalOperatorInfo;
@@ -667,7 +668,7 @@ SOperatorInfo *createSortOperatorInfo(SOperatorInfo* downstream, SSDataBlock* pR
 SOperatorInfo* createSortedMergeOperatorInfo(SOperatorInfo** downstream, int32_t numOfDownstream, SExprInfo* pExprInfo, int32_t num, SArray* pSortInfo, SArray* pGroupInfo, SExecTaskInfo* pTaskInfo);
 SOperatorInfo* createSysTableScanOperatorInfo(void* pSysTableReadHandle, SSDataBlock* pResBlock, const SName* pName,
                                               SNode* pCondition, SEpSet epset, SArray* colList, SExecTaskInfo* pTaskInfo, bool showRewrite, int32_t accountId);
-SOperatorInfo* createIntervalOperatorInfo(SOperatorInfo* downstream, SExprInfo* pExprInfo, int32_t numOfCols, SSDataBlock* pResBlock, SInterval* pInterval,
+SOperatorInfo* createIntervalOperatorInfo(SOperatorInfo* downstream, SExprInfo* pExprInfo, int32_t numOfCols, SSDataBlock* pResBlock, SInterval* pInterval, int32_t primaryTsSlot,
                                           const STableGroupInfo* pTableGroupInfo, SExecTaskInfo* pTaskInfo);
 SOperatorInfo* createSessionAggOperatorInfo(SOperatorInfo* downstream, SExprInfo* pExprInfo, int32_t numOfCols, SSDataBlock* pResBlock, int64_t gap, SExecTaskInfo* pTaskInfo);
 SOperatorInfo* createGroupOperatorInfo(SOperatorInfo* downstream, SExprInfo* pExprInfo, int32_t numOfCols, SSDataBlock* pResultBlock,
diff --git a/source/libs/executor/src/executorimpl.c b/source/libs/executor/src/executorimpl.c
index 2323291fc1..56b2d79112 100644
--- a/source/libs/executor/src/executorimpl.c
+++ b/source/libs/executor/src/executorimpl.c
@@ -1501,7 +1501,7 @@ static SArray* hashIntervalAgg(SOperatorInfo* pOperatorInfo, SResultRowInfo* pRe
 
   TSKEY* tsCols = NULL;
   if (pSDataBlock->pDataBlock != NULL) {
-    SColumnInfoData* pColDataInfo = taosArrayGet(pSDataBlock->pDataBlock, 0);
+    SColumnInfoData* pColDataInfo = taosArrayGet(pSDataBlock->pDataBlock, pInfo->primaryTsIndex);
     tsCols = (int64_t*)pColDataInfo->pData;
 //    assert(tsCols[0] == pSDataBlock->info.window.skey && tsCols[pSDataBlock->info.rows - 1] ==
 //           pSDataBlock->info.window.ekey);
@@ -6345,7 +6345,7 @@ _error:
 }
 
 SOperatorInfo* createIntervalOperatorInfo(SOperatorInfo* downstream, SExprInfo* pExprInfo, int32_t numOfCols,
-                                          SSDataBlock* pResBlock, SInterval* pInterval,
+                                          SSDataBlock* pResBlock, SInterval* pInterval, int32_t primaryTsSlot,
                                           const STableGroupInfo* pTableGroupInfo, SExecTaskInfo* pTaskInfo) {
   STableIntervalOperatorInfo* pInfo = taosMemoryCalloc(1, sizeof(STableIntervalOperatorInfo));
   SOperatorInfo*              pOperator = taosMemoryCalloc(1, sizeof(SOperatorInfo));
@@ -6361,6 +6361,8 @@ SOperatorInfo* createIntervalOperatorInfo(SOperatorInfo* downstream, SExprInfo*
   pInfo->win.skey  = 0;
   pInfo->win.ekey  = INT64_MAX;
 
+  pInfo->primaryTsIndex = primaryTsSlot;
+
   int32_t numOfRows = 4096;
   int32_t code = initAggInfo(&pInfo->binfo, &pInfo->aggSup, pExprInfo, numOfCols, numOfRows, pResBlock, pTaskInfo->id.str);
   initExecTimeWindowInfo(&pInfo->timeWindowData, &pInfo->win);
@@ -7116,7 +7118,6 @@ SOperatorInfo* createOperatorTree(SPhysiNode* pPhyNode, SExecTaskInfo* pTaskInfo
 
       SIntervalPhysiNode* pIntervalPhyNode = (SIntervalPhysiNode*)pPhyNode;
 
-      // todo: set the correct primary timestamp key column
       int32_t      num = 0;
       SExprInfo*   pExprInfo = createExprInfo(pIntervalPhyNode->window.pFuncs, NULL, &num);
       SSDataBlock* pResBlock = createOutputBuf_rv1(pPhyNode->pOutputDataBlockDesc);
@@ -7126,8 +7127,10 @@ SOperatorInfo* createOperatorTree(SPhysiNode* pPhyNode, SExecTaskInfo* pTaskInfo
                             .intervalUnit = pIntervalPhyNode->intervalUnit,
                             .slidingUnit  = pIntervalPhyNode->slidingUnit,
                             .offset       = pIntervalPhyNode->offset,
-                            .precision    = TSDB_TIME_PRECISION_MILLI};
-      return createIntervalOperatorInfo(op, pExprInfo, num, pResBlock, &interval, pTableGroupInfo, pTaskInfo);
+                            .precision    = pIntervalPhyNode->precision};
+
+      int32_t primaryTsSlotId = ((SColumnNode*) pIntervalPhyNode->pTspk)->slotId;
+      return createIntervalOperatorInfo(op, pExprInfo, num, pResBlock, &interval, primaryTsSlotId, pTableGroupInfo, pTaskInfo);
     }
   } else if (QUERY_NODE_PHYSICAL_PLAN_SORT == nodeType(pPhyNode)) {
     size_t size = LIST_LENGTH(pPhyNode->pChildren);