diff --git a/src/client/src/tscServer.c b/src/client/src/tscServer.c
index 788574a837f5c7f61da1c72576943a5c283a3ff1..3a57d333ad7490db89ca4c19060a0ac1af5e6cfc 100644
--- a/src/client/src/tscServer.c
+++ b/src/client/src/tscServer.c
@@ -1097,6 +1097,9 @@ int tscBuildQueryMsg(SSqlObj *pSql, SSqlInfo *pInfo) {
     pQueryMsg->tsBuf.tsOrder = htonl(pQueryInfo->tsBuf->tsOrder);
     pQueryMsg->tsBuf.tsLen   = htonl(pQueryMsg->tsBuf.tsLen);
     pQueryMsg->tsBuf.tsNumOfBlocks = htonl(pQueryMsg->tsBuf.tsNumOfBlocks);
+  } else {
+    pQueryMsg->tsBuf.tsLen = 0;
+    pQueryMsg->tsBuf.tsNumOfBlocks = 0;
   }
 
   int32_t numOfOperator = (int32_t) taosArrayGetSize(queryOperator);
@@ -1134,6 +1137,8 @@ int tscBuildQueryMsg(SSqlObj *pSql, SSqlInfo *pInfo) {
 
       pMsg += pUdfInfo->contLen;
     }
+  } else {
+    pQueryMsg->udfContentOffset = 0;
   }
 
   memcpy(pMsg, pSql->sqlstr, sqlLen);
diff --git a/src/query/inc/qExecutor.h b/src/query/inc/qExecutor.h
index 31db6492f69c35904970cc5f48cc4a10c9fecd39..19ca8e7ed8867f32c9625fe66ad4c04d64bc98e7 100644
--- a/src/query/inc/qExecutor.h
+++ b/src/query/inc/qExecutor.h
@@ -86,11 +86,18 @@ typedef struct SResultRow {
   char         *key;               // start key of current result row
 } SResultRow;
 
+typedef struct SResultRowCell {
+  uint64_t     groupId;
+  SResultRow  *pRow;
+} SResultRowCell;
+
 typedef struct SGroupResInfo {
   int32_t totalGroup;
   int32_t currentGroup;
   int32_t index;
   SArray* pRows;      // SArray<SResultRow*>
+  bool    ordered;
+  int32_t position;
 } SGroupResInfo;
 
 /**
@@ -284,8 +291,9 @@ typedef struct SQueryRuntimeEnv {
   SDiskbasedResultBuf*  pResultBuf;       // query result buffer based on blocked-wised disk file
   SHashObj*             pResultRowHashTable; // quick locate the window object for each result
   SHashObj*             pResultRowListSet;   // used to check if current ResultRowInfo has ResultRow object or not
+  SArray*               pResultRowArrayList; // The array list that contains the Result rows
   char*                 keyBuf;           // window key buffer
-  SResultRowPool*       pool;             // window result object pool
+  SResultRowPool*       pool;             // The window result objects pool, all the resultRow Objects are allocated and managed by this object.
   char**                prevRow;
 
   SArray*               prevResult;       // intermediate result, SArray<SInterResult>
diff --git a/src/query/src/qExecutor.c b/src/query/src/qExecutor.c
index ddc14f4cef3fa26553f29c8a9d3e2711f80a746f..5ca2e58cc92d20f84551a5779d0d5fa638b7aabc 100644
--- a/src/query/src/qExecutor.c
+++ b/src/query/src/qExecutor.c
@@ -544,6 +544,8 @@ static SResultRow* doSetResultOutBufByKey(SQueryRuntimeEnv* pRuntimeEnv, SResult
 
       // add a new result set for a new group
       taosHashPut(pRuntimeEnv->pResultRowHashTable, pRuntimeEnv->keyBuf, GET_RES_WINDOW_KEY_LEN(bytes), &pResult, POINTER_BYTES);
+      SResultRowCell cell = {.groupId = tableGroupId, .pRow = pResult};
+      taosArrayPush(pRuntimeEnv->pResultRowArrayList, &cell);
     } else {
       pResult = *p1;
     }
@@ -2110,6 +2112,7 @@ static int32_t setupQueryRuntimeEnv(SQueryRuntimeEnv *pRuntimeEnv, int32_t numOf
   pRuntimeEnv->pResultRowListSet = taosHashInit(numOfTables * 10, taosGetDefaultHashFunction(TSDB_DATA_TYPE_BINARY), false, HASH_NO_LOCK);
   pRuntimeEnv->keyBuf  = malloc(pQueryAttr->maxTableColumnWidth + sizeof(int64_t) + POINTER_BYTES);
   pRuntimeEnv->pool    = initResultRowPool(getResultRowSize(pRuntimeEnv));
+  pRuntimeEnv->pResultRowArrayList = taosArrayInit(numOfTables, sizeof(SResultRowCell));
 
   pRuntimeEnv->prevRow = malloc(POINTER_BYTES * pQueryAttr->numOfCols + pQueryAttr->srcRowSize);
   pRuntimeEnv->tagVal  = malloc(pQueryAttr->tagLen);
@@ -6379,6 +6382,7 @@ static SSDataBlock* hashGroupbyAggregate(void* param, bool* newgroup) {
   if (!pRuntimeEnv->pQueryAttr->stableQuery) {
     sortGroupResByOrderList(&pRuntimeEnv->groupResInfo, pRuntimeEnv, pInfo->binfo.pRes);
   }
+
   toSSDataBlock(&pRuntimeEnv->groupResInfo, pRuntimeEnv, pInfo->binfo.pRes);
 
   if (pInfo->binfo.pRes->info.rows == 0 || !hasRemainDataInCurrentGroup(&pRuntimeEnv->groupResInfo)) {
@@ -8647,7 +8651,6 @@ int32_t initQInfo(STsBufInfo* pTsBufInfo, void* tsdb, void* sourceOptr, SQInfo*
   SArray* prevResult = NULL;
   if (prevResultLen > 0) {
     prevResult = interResFromBinary(param->prevResult, prevResultLen);
-
     pRuntimeEnv->prevResult = prevResult;
   }
 
diff --git a/src/query/src/qUtil.c b/src/query/src/qUtil.c
index 539c292bb3adb81890ea0735d598f049260526a2..961b388c39847e96a0dd8b6f5d60605c29e8d524 100644
--- a/src/query/src/qUtil.c
+++ b/src/query/src/qUtil.c
@@ -456,7 +456,79 @@ static int32_t tableResultComparFn(const void *pLeft, const void *pRight, void *
   }
 }
 
-static int32_t mergeIntoGroupResultImpl(SQueryRuntimeEnv *pRuntimeEnv, SGroupResInfo* pGroupResInfo, SArray *pTableList,
+int32_t tsAscOrder(const void* p1, const void* p2) {
+  SResultRowCell* pc1 = (SResultRowCell*) p1;
+  SResultRowCell* pc2 = (SResultRowCell*) p2;
+
+  if (pc1->groupId == pc2->groupId) {
+    if (pc1->pRow->win.skey == pc2->pRow->win.skey) {
+      return 0;
+    } else {
+      return (pc1->pRow->win.skey < pc2->pRow->win.skey)? -1:1;
+    }
+  } else {
+    return (pc1->groupId < pc2->groupId)? -1:1;
+  }
+}
+
+int32_t tsDescOrder(const void* p1, const void* p2) {
+  SResultRowCell* pc1 = (SResultRowCell*) p1;
+  SResultRowCell* pc2 = (SResultRowCell*) p2;
+
+  if (pc1->groupId == pc2->groupId) {
+    if (pc1->pRow->win.skey == pc2->pRow->win.skey) {
+      return 0;
+    } else {
+      return (pc1->pRow->win.skey < pc2->pRow->win.skey)? 1:-1;
+    }
+  } else {
+    return (pc1->groupId < pc2->groupId)? -1:1;
+  }
+}
+
+void orderTheResultRows(SQueryRuntimeEnv* pRuntimeEnv) {
+  __compar_fn_t  fn = NULL;
+  if (pRuntimeEnv->pQueryAttr->order.order == TSDB_ORDER_ASC) {
+    fn = tsAscOrder;
+  } else {
+    fn = tsDescOrder;
+  }
+
+  taosArraySort(pRuntimeEnv->pResultRowArrayList, fn);
+}
+
+static int32_t mergeIntoGroupResultImplRv(SQueryRuntimeEnv *pRuntimeEnv, SGroupResInfo* pGroupResInfo, uint64_t groupId, int32_t* rowCellInfoOffset) {
+  if (!pGroupResInfo->ordered) {
+    orderTheResultRows(pRuntimeEnv);
+    pGroupResInfo->ordered = true;
+  }
+
+  if (pGroupResInfo->pRows == NULL) {
+    pGroupResInfo->pRows = taosArrayInit(100, POINTER_BYTES);
+  }
+
+  size_t len = taosArrayGetSize(pRuntimeEnv->pResultRowArrayList);
+  for(; pGroupResInfo->position < len; ++pGroupResInfo->position) {
+
+    SResultRowCell* pResultRowCell = taosArrayGet(pRuntimeEnv->pResultRowArrayList, pGroupResInfo->position);
+    if (pResultRowCell->groupId != groupId) {
+      break;
+    }
+
+    int64_t num = getNumOfResultWindowRes(pRuntimeEnv, pResultRowCell->pRow, rowCellInfoOffset);
+    if (num <= 0) {
+      continue;
+    }
+
+    taosArrayPush(pGroupResInfo->pRows, &pResultRowCell->pRow);
+    pResultRowCell->pRow->numOfRows = (uint32_t) num;
+
+  }
+
+  return TSDB_CODE_SUCCESS;
+}
+
+static UNUSED_FUNC int32_t mergeIntoGroupResultImpl(SQueryRuntimeEnv *pRuntimeEnv, SGroupResInfo* pGroupResInfo, SArray *pTableList,
     int32_t* rowCellInfoOffset) {
   bool ascQuery = QUERY_IS_ASC_QUERY(pRuntimeEnv->pQueryAttr);
 
@@ -562,12 +634,13 @@ int32_t mergeIntoGroupResult(SGroupResInfo* pGroupResInfo, SQueryRuntimeEnv* pRu
   int64_t st = taosGetTimestampUs();
 
   while (pGroupResInfo->currentGroup < pGroupResInfo->totalGroup) {
-    SArray *group = GET_TABLEGROUP(pRuntimeEnv, pGroupResInfo->currentGroup);
+//    SArray *group = GET_TABLEGROUP(pRuntimeEnv, pGroupResInfo->currentGroup);
 
-    int32_t ret = mergeIntoGroupResultImpl(pRuntimeEnv, pGroupResInfo, group, offset);
-    if (ret != TSDB_CODE_SUCCESS) {
-      return ret;
-    }
+    mergeIntoGroupResultImplRv(pRuntimeEnv, pGroupResInfo, pGroupResInfo->currentGroup, offset);
+//    int32_t ret = mergeIntoGroupResultImpl(pRuntimeEnv, pGroupResInfo, group, offset);
+//    if (ret != TSDB_CODE_SUCCESS) {
+//      return ret;
+//    }
 
     // this group generates at least one result, return results
     if (taosArrayGetSize(pGroupResInfo->pRows) > 0) {