diff --git a/src/query/inc/qExecutor.h b/src/query/inc/qExecutor.h
index 4ec6ed30babb3d22c2cb1d050edb2c217c41b8eb..aa018e75d44e0c470122504abd666687e1cf62eb 100644
--- a/src/query/inc/qExecutor.h
+++ b/src/query/inc/qExecutor.h
@@ -84,14 +84,13 @@ typedef struct SResultRec {
 } SResultRec;
 
 typedef struct SWindowResInfo {
-  SResultRow**   pResult;    // result list
-  int16_t        type:8;     // data type for hash key
-  int32_t        size:24;    // number of result set
-  int32_t        threshold;  // threshold to halt query and return the generated results.
-  int32_t        capacity;   // max capacity
-  int32_t        curIndex;   // current start active index
-  int64_t        startTime;  // start time of the first time window for sliding query
-  int64_t        prevSKey;   // previous (not completed) sliding window start key
+  SResultRow** pResult;    // result list
+  int16_t      type:8;     // data type for hash key
+  int32_t      size:24;    // number of result set
+  int32_t      capacity;   // max capacity
+  int32_t      curIndex;   // current start active index
+  int64_t      startTime;  // start time of the first time window for sliding query
+  int64_t      prevSKey;   // previous (not completed) sliding window start key
 } SWindowResInfo;
 
 typedef struct SColumnFilterElem {
diff --git a/src/query/inc/qUtil.h b/src/query/inc/qUtil.h
index 8b84ac018250486a8df506ea440be724c9659887..f15f1f33ebff7861929271eb3678fa4d918eb0b4 100644
--- a/src/query/inc/qUtil.h
+++ b/src/query/inc/qUtil.h
@@ -30,7 +30,7 @@ void clearResultRow(SQueryRuntimeEnv* pRuntimeEnv, SResultRow* pRow, int16_t typ
 void copyResultRow(SQueryRuntimeEnv* pRuntimeEnv, SResultRow* dst, const SResultRow* src, int16_t type);
 SResultRowCellInfo* getResultCell(SQueryRuntimeEnv* pRuntimeEnv, const SResultRow* pRow, int32_t index);
 
-int32_t initWindowResInfo(SWindowResInfo* pWindowResInfo, int32_t size, int32_t threshold, int16_t type);
+int32_t initWindowResInfo(SWindowResInfo* pWindowResInfo, int32_t size, int16_t type);
 
 void    cleanupTimeWindowInfo(SWindowResInfo* pWindowResInfo);
 void    resetTimeWindowInfo(SQueryRuntimeEnv* pRuntimeEnv, SWindowResInfo* pWindowResInfo);
diff --git a/src/query/src/qExecutor.c b/src/query/src/qExecutor.c
index cda9455d6f96d95f9b07362fc567645c18a0c6e3..bfdcd6d28aa38f10d9150a5386abdd45a71a1346 100644
--- a/src/query/src/qExecutor.c
+++ b/src/query/src/qExecutor.c
@@ -761,7 +761,7 @@ static int32_t doCheckQueryCompleted(SQueryRuntimeEnv *pRuntimeEnv, TSKEY lastKe
     pWindowResInfo->prevSKey = pWindowResInfo->pResult[pWindowResInfo->curIndex]->win.skey;
 
     // the number of completed slots are larger than the threshold, return current generated results to client.
-    if (numOfClosed > pWindowResInfo->threshold) {
+    if (numOfClosed > pQuery->rec.threshold) {
       qDebug("QInfo:%p total result window:%d closed:%d, reached the output threshold %d, return",
           GET_QINFO_ADDR(pRuntimeEnv), pWindowResInfo->size, numOfClosed, pQuery->rec.threshold);
 
@@ -3587,17 +3587,9 @@ static void updateTableQueryInfoForReverseScan(SQuery *pQuery, STableQueryInfo *
 
   // order has changed already
   int32_t step = GET_FORWARD_DIRECTION_FACTOR(pQuery->order.order);
-
-  // TODO validate the assertion
-//  if (!QUERY_IS_ASC_QUERY(pQuery)) {
-//    assert(pTableQueryInfo->win.ekey >= pTableQueryInfo->lastKey + step);
-//  } else {
-//    assert(pTableQueryInfo->win.ekey <= pTableQueryInfo->lastKey + step);
-//  }
-
   if (pTableQueryInfo->lastKey == pTableQueryInfo->win.skey) {
     // do nothing, no results
-  } else {// even win.skey != lastKey, the results may not generated.
+  } else {// NOTE: even win.skey != lastKey, the results may not generated.
     pTableQueryInfo->win.ekey = pTableQueryInfo->lastKey + step;
   }
 
@@ -4102,9 +4094,8 @@ static STableQueryInfo *createTableQueryInfo(SQueryRuntimeEnv *pRuntimeEnv, void
 
   // set more initial size of interval/groupby query
   if (QUERY_IS_INTERVAL_QUERY(pQuery) || pRuntimeEnv->groupbyNormalCol) {
-    int32_t initialSize = 16;
-    int32_t initialThreshold = 100;
-    int32_t code = initWindowResInfo(&pTableQueryInfo->windowResInfo, initialSize, initialThreshold, TSDB_DATA_TYPE_INT);
+    int32_t initialSize = 128;
+    int32_t code = initWindowResInfo(&pTableQueryInfo->windowResInfo, initialSize, TSDB_DATA_TYPE_INT);
     if (code != TSDB_CODE_SUCCESS) {
       return NULL;
     }
@@ -4989,20 +4980,13 @@ int32_t doInitQInfo(SQInfo *pQInfo, STSBuf *pTsBuf, void *tsdb, int32_t vgId, bo
 
     if (!QUERY_IS_INTERVAL_QUERY(pQuery)) {
       int16_t type = TSDB_DATA_TYPE_NULL;
-      int32_t threshold = 0;
-
       if (pRuntimeEnv->groupbyNormalCol) {  // group by columns not tags;
         type = getGroupbyColumnType(pQuery, pQuery->pGroupbyExpr);
-        threshold = 4000;
       } else {
         type = TSDB_DATA_TYPE_INT;  // group id
-        threshold = (int32_t)(GET_NUM_OF_TABLEGROUP(pQInfo));
-        if (threshold < 8) {
-          threshold = 8;
-        }
       }
 
-      code = initWindowResInfo(&pRuntimeEnv->windowResInfo, 8, threshold, type);
+      code = initWindowResInfo(&pRuntimeEnv->windowResInfo, 8, type);
       if (code != TSDB_CODE_SUCCESS) {
         return code;
       }
@@ -5022,7 +5006,7 @@ int32_t doInitQInfo(SQInfo *pQInfo, STSBuf *pTsBuf, void *tsdb, int32_t vgId, bo
       type = TSDB_DATA_TYPE_TIMESTAMP;
     }
 
-    code = initWindowResInfo(&pRuntimeEnv->windowResInfo, numOfResultRows, 1024, type);
+    code = initWindowResInfo(&pRuntimeEnv->windowResInfo, numOfResultRows, type);
     if (code != TSDB_CODE_SUCCESS) {
       return code;
     }
diff --git a/src/query/src/qUtil.c b/src/query/src/qUtil.c
index f5f2da9f2533dbc98391450db00125afc1c7bcc3..3f010a579d4b555f4094ce4dad4c645a42b24810 100644
--- a/src/query/src/qUtil.c
+++ b/src/query/src/qUtil.c
@@ -43,10 +43,9 @@ int32_t getOutputInterResultBufSize(SQuery* pQuery) {
   return size;
 }
 
-int32_t initWindowResInfo(SWindowResInfo *pWindowResInfo, int32_t size, int32_t threshold, int16_t type) {
+int32_t initWindowResInfo(SWindowResInfo *pWindowResInfo, int32_t size, int16_t type) {
   pWindowResInfo->capacity = size;
-  pWindowResInfo->threshold = threshold;
-  
+
   pWindowResInfo->type = type;
   pWindowResInfo->curIndex = -1;
   pWindowResInfo->size     = 0;