diff --git a/src/query/src/queryExecutor.c b/src/query/src/queryExecutor.c
index 50e749c927edcc32d518632c540093fea7e3d4e7..71b1b0fc68895358b7f411d730cebde3f15f42a5 100644
--- a/src/query/src/queryExecutor.c
+++ b/src/query/src/queryExecutor.c
@@ -1225,9 +1225,9 @@ static void rowwiseApplyFunctions(SQueryRuntimeEnv *pRuntimeEnv, SDataStatis *pS
     } else {  // other queries
       // decide which group this rows belongs to according to current state value
       if (groupbyStateValue) {
-        char *stateVal = groupbyColumnData + bytes * offset;
+        char *val = groupbyColumnData + bytes * offset;
 
-        int32_t ret = setGroupResultOutputBuf(pRuntimeEnv, stateVal, type, bytes);
+        int32_t ret = setGroupResultOutputBuf(pRuntimeEnv, val, type, bytes);
         if (ret != TSDB_CODE_SUCCESS) {  // null data, too many state code
           continue;
         }
@@ -1268,10 +1268,10 @@ static void rowwiseApplyFunctions(SQueryRuntimeEnv *pRuntimeEnv, SDataStatis *pS
 }
 
 static int32_t tableApplyFunctionsOnBlock(SQueryRuntimeEnv *pRuntimeEnv, SDataBlockInfo *pDataBlockInfo,
-                                          SDataStatis *pStatis, __block_search_fn_t searchFn,
-                                          SWindowResInfo *pWindowResInfo, SArray *pDataBlock) {
+                                          SDataStatis *pStatis, __block_search_fn_t searchFn, SArray *pDataBlock) {
   SQuery *pQuery = pRuntimeEnv->pQuery;
-
+  SWindowResInfo *pWindowResInfo = &pRuntimeEnv->windowResInfo;
+  
   if (pQuery->numOfFilterCols > 0 || pRuntimeEnv->pTSBuf != NULL || isGroupbyNormalCol(pQuery->pGroupbyExpr)) {
     rowwiseApplyFunctions(pRuntimeEnv, pStatis, pDataBlockInfo, pWindowResInfo, pDataBlock);
   } else {
@@ -2446,6 +2446,7 @@ int32_t binarySearchForKey(char *pValue, int num, TSKEY key, int order) {
 
 static int64_t doScanAllDataBlocks(SQueryRuntimeEnv *pRuntimeEnv) {
   SQuery *pQuery = pRuntimeEnv->pQuery;
+  
   qTrace("QInfo:%p query start, qrange:%" PRId64 "-%" PRId64 ", lastkey:%" PRId64 ", order:%d",
          GET_QINFO_ADDR(pRuntimeEnv), pQuery->window.skey, pQuery->window.ekey, pQuery->lastKey, pQuery->order.order);
 
@@ -2478,7 +2479,7 @@ static int64_t doScanAllDataBlocks(SQueryRuntimeEnv *pRuntimeEnv) {
       }
     }
 
-    // in case of prj/diff query, ensure the output buffer is sufficient to accomodate the results of current block
+    // in case of prj/diff query, ensure the output buffer is sufficient to accommodate the results of current block
     if (!isIntervalQuery(pQuery) && !isGroupbyNormalCol(pQuery->pGroupbyExpr) && !isFixedOutputQuery(pQuery)) {
       SResultRec *pRec = &pQuery->rec;
 
@@ -2507,8 +2508,7 @@ static int64_t doScanAllDataBlocks(SQueryRuntimeEnv *pRuntimeEnv) {
     SArray *     pDataBlock = loadDataBlockOnDemand(pRuntimeEnv, pQueryHandle, &blockInfo, &pStatis);
 
     pQuery->pos = QUERY_IS_ASC_QUERY(pQuery) ? 0 : blockInfo.rows - 1;
-    int32_t numOfRes = tableApplyFunctionsOnBlock(pRuntimeEnv, &blockInfo, pStatis, binarySearchForKey,
-                                                  &pRuntimeEnv->windowResInfo, pDataBlock);
+    int32_t numOfRes = tableApplyFunctionsOnBlock(pRuntimeEnv, &blockInfo, pStatis, binarySearchForKey, pDataBlock);
 
     qTrace("QInfo:%p check data block, brange:%" PRId64 "-%" PRId64 ", rows:%d, res:%d", GET_QINFO_ADDR(pRuntimeEnv),
            blockInfo.window.skey, blockInfo.window.ekey, blockInfo.rows, numOfRes);
@@ -2519,7 +2519,7 @@ static int64_t doScanAllDataBlocks(SQueryRuntimeEnv *pRuntimeEnv) {
     }
   }
 
-  // if the result buffer is not full, set the query completed flag
+  // if the result buffer is not full, set the query complete
   if (!Q_STATUS_EQUAL(pQuery->status, QUERY_RESBUF_FULL)) {
     setQueryStatus(pQuery, QUERY_COMPLETED);
   }
@@ -2530,7 +2530,7 @@ static int64_t doScanAllDataBlocks(SQueryRuntimeEnv *pRuntimeEnv) {
 
       closeAllTimeWindow(&pRuntimeEnv->windowResInfo);
       removeRedundantWindow(&pRuntimeEnv->windowResInfo, pQuery->lastKey - step, step);
-      pRuntimeEnv->windowResInfo.curIndex = pRuntimeEnv->windowResInfo.size - 1;
+      pRuntimeEnv->windowResInfo.curIndex = pRuntimeEnv->windowResInfo.size - 1;  // point to the last time window
     } else {
       assert(Q_STATUS_EQUAL(pQuery->status, QUERY_RESBUF_FULL));
     }
@@ -3436,7 +3436,7 @@ void scanAllDataBlocks(SQueryRuntimeEnv *pRuntimeEnv) {
 
     STsdbQueryCond cond = {
         .twindow = qstatus.curWindow,
-        .order = pQuery->order.order,
+        .order   = pQuery->order.order,
         .colList = pQuery->colList,
         .numOfCols = pQuery->numOfCols,
     };
@@ -3457,7 +3457,7 @@ void scanAllDataBlocks(SQueryRuntimeEnv *pRuntimeEnv) {
     }
   }
 
-  if (!needReverseScan(pQuery)) {
+  if (pRuntimeEnv->stableQuery || !needReverseScan(pQuery)) {
     return;
   }
 
@@ -4060,8 +4060,7 @@ static void updateOffsetVal(SQueryRuntimeEnv *pRuntimeEnv, SDataBlockInfo *pBloc
   pQuery->lastKey = keys[pQuery->pos];
   pQuery->limit.offset = 0;
 
-  int32_t numOfRes = tableApplyFunctionsOnBlock(pRuntimeEnv, pBlockInfo, NULL, binarySearchForKey,
-                                                &pRuntimeEnv->windowResInfo, pDataBlock);
+  int32_t numOfRes = tableApplyFunctionsOnBlock(pRuntimeEnv, pBlockInfo, NULL, binarySearchForKey, pDataBlock);
 
   qTrace("QInfo:%p check data block, brange:%" PRId64 "-%" PRId64 ", rows:%d, res:%d", GET_QINFO_ADDR(pRuntimeEnv),
          pBlockInfo->window.skey, pBlockInfo->window.ekey, pBlockInfo->rows, numOfRes);
@@ -4166,8 +4165,7 @@ static bool skipTimeInterval(SQueryRuntimeEnv *pRuntimeEnv) {
           pQuery->lastKey = ((TSKEY *)pColInfoData->pData)[startPos];
           pWindowResInfo->prevSKey = tw.skey;
 
-          int32_t numOfRes = tableApplyFunctionsOnBlock(pRuntimeEnv, &blockInfo, NULL, binarySearchForKey,
-                                                        &pRuntimeEnv->windowResInfo, pDataBlock);
+          int32_t numOfRes = tableApplyFunctionsOnBlock(pRuntimeEnv, &blockInfo, NULL, binarySearchForKey, pDataBlock);
 
           qTrace("QInfo:%p check data block, brange:%" PRId64 "-%" PRId64 ", rows:%d, res:%d",
                  GET_QINFO_ADDR(pRuntimeEnv), blockInfo.window.skey, blockInfo.window.ekey, blockInfo.rows, numOfRes);
@@ -4454,6 +4452,7 @@ static bool multiTableMultioutputHelper(SQInfo *pQInfo, int32_t index) {
       .numOfCols = pQuery->numOfCols,
   };
 
+  // todo refactor
   SArray *g1 = taosArrayInit(1, POINTER_BYTES);
   SArray *tx = taosArrayInit(1, sizeof(STableId));
 
@@ -4624,10 +4623,6 @@ static void sequentialTableProcess(SQInfo *pQInfo) {
       SGroupItem *item = taosArrayGet(group, pQInfo->tableIndex);
       
       STableQueryInfo *pInfo = item->info;
-      if (pInfo->lastKey > 0) {
-        pQuery->window.skey = pInfo->lastKey;
-      }
-
       if (!multiTableMultioutputHelper(pQInfo, pQInfo->tableIndex)) {
         pQInfo->tableIndex++;
         continue;
@@ -4635,7 +4630,7 @@ static void sequentialTableProcess(SQInfo *pQInfo) {
 
       //      SPointInterpoSupporter pointInterpSupporter = {0};
 
-      // TODO handle the limit problem
+      // TODO handle the limit offset problem
       if (pQuery->numOfFilterCols == 0 && pQuery->limit.offset > 0) {
         //        skipBlocks(pRuntimeEnv);