fix: plan problem with interval fill statement

source/libs/planner/src/planLogicCreater.c

@@ -719,7 +719,7 @@ static int32_t createWindowLogicNodeByInterval(SLogicPlanContext* pCxt, SInterva
   pWindow->slidingUnit =
       (NULL != pInterval->pSliding ? ((SValueNode*)pInterval->pSliding)->unit : pWindow->intervalUnit);
   pWindow->windowAlgo = pCxt->pPlanCxt->streamQuery ? INTERVAL_ALGO_STREAM_SINGLE : INTERVAL_ALGO_HASH;
-  pWindow->node.groupAction = getGroupAction(pCxt, pSelect);
+  pWindow->node.groupAction = (NULL != pInterval->pFill ? GROUP_ACTION_KEEP : getGroupAction(pCxt, pSelect));
   pWindow->node.requireDataOrder = pSelect->hasTimeLineFunc ? DATA_ORDER_LEVEL_IN_GROUP : DATA_ORDER_LEVEL_IN_BLOCK;
   pWindow->node.resultDataOrder = DATA_ORDER_LEVEL_IN_GROUP;