diff --git a/include/common/tdatablock.h b/include/common/tdatablock.h
index fa203e231a..41e91ce6a6 100644
--- a/include/common/tdatablock.h
+++ b/include/common/tdatablock.h
@@ -238,10 +238,16 @@ static FORCE_INLINE int32_t blockCompressColData(SColumnInfoData* pColRes, int32
 
 static FORCE_INLINE void blockCompressEncode(const SSDataBlock* pBlock, char* data, int32_t* dataLen, int32_t numOfCols,
                                              int8_t needCompress) {
-  int32_t* colSizes = (int32_t*)data;
+  int32_t* actualLen = (int32_t*) data;
+  data += sizeof(int32_t);
 
+  uint64_t* groupId = (uint64_t*) data;
+  data += sizeof(uint64_t);
+
+  int32_t* colSizes = (int32_t*)data;
   data += numOfCols * sizeof(int32_t);
-  *dataLen = (numOfCols * sizeof(int32_t));
+
+  *dataLen = (numOfCols * sizeof(int32_t) + sizeof(uint64_t) + sizeof(int32_t));
 
   int32_t numOfRows = pBlock->info.rows;
   for (int32_t col = 0; col < numOfCols; ++col) {
@@ -273,6 +279,9 @@ static FORCE_INLINE void blockCompressEncode(const SSDataBlock* pBlock, char* da
 
     colSizes[col] = htonl(colSizes[col]);
   }
+
+  *actualLen = *dataLen;
+  *groupId = pBlock->info.groupId;
 }
 
 #ifdef __cplusplus
diff --git a/source/client/src/clientImpl.c b/source/client/src/clientImpl.c
index 8fcd16a622..73b0a0e4dc 100644
--- a/source/client/src/clientImpl.c
+++ b/source/client/src/clientImpl.c
@@ -835,10 +835,21 @@ int32_t setResultDataPtr(SReqResultInfo* pResultInfo, TAOS_FIELD* pFields, int32
     return code;
   }
 
-  int32_t* colLength = (int32_t*)pResultInfo->pData;
-  char*    pStart = ((char*)pResultInfo->pData) + sizeof(int32_t) * numOfCols;
+  char* p = (char*) pResultInfo->pData;
+
+  int32_t dataLen = *(int32_t*) p;
+  p += sizeof(int32_t);
+
+  uint64_t groupId = *(uint64_t*) p;
+  p += sizeof(uint64_t);
+
+  int32_t* colLength = (int32_t*)p;
+  p += sizeof(int32_t) * numOfCols;
+
+  char* pStart = p;
   for (int32_t i = 0; i < numOfCols; ++i) {
     colLength[i] = htonl(colLength[i]);
+    ASSERT(colLength[i] < dataLen);
 
     if (IS_VAR_DATA_TYPE(pResultInfo->fields[i].type)) {
       pResultInfo->pCol[i].offset = (int32_t*)pStart;
diff --git a/source/common/src/tdatablock.c b/source/common/src/tdatablock.c
index 800bcd70ce..09452b584d 100644
--- a/source/common/src/tdatablock.c
+++ b/source/common/src/tdatablock.c
@@ -644,12 +644,12 @@ size_t blockDataGetRowSize(SSDataBlock* pBlock) {
 
 /**
  * @refitem blockDataToBuf for the meta size
- *
  * @param pBlock
  * @return
  */
 size_t blockDataGetSerialMetaSize(const SSDataBlock* pBlock) {
-  return sizeof(int32_t) + pBlock->info.numOfCols * sizeof(int32_t);
+  // | total rows/total length | block group id | each column length |
+  return sizeof(int32_t) + sizeof(uint64_t) + pBlock->info.numOfCols * sizeof(int32_t);
 }
 
 double blockDataGetSerialRowSize(const SSDataBlock* pBlock) {
@@ -1219,7 +1219,6 @@ void colDataDestroy(SColumnInfoData* pColData) {
   taosMemoryFree(pColData->pData);
 }
 
-
 static void doShiftBitmap(char* nullBitmap, size_t n, size_t total) {
   int32_t len = BitmapLen(total);
 
diff --git a/source/dnode/vnode/src/tsdb/tsdbRead.c b/source/dnode/vnode/src/tsdb/tsdbRead.c
index fd640471bd..c73566355d 100644
--- a/source/dnode/vnode/src/tsdb/tsdbRead.c
+++ b/source/dnode/vnode/src/tsdb/tsdbRead.c
@@ -3223,8 +3223,13 @@ void tsdbRetrieveDataBlockInfo(tsdbReaderT* pTsdbReadHandle, SDataBlockInfo* pDa
   tsdbDebug("data block generated, uid:%" PRIu64 " numOfRows:%d, tsrange:%" PRId64 " - %" PRId64 " %s", uid, cur->rows,
             cur->win.skey, cur->win.ekey, pHandle->idStr);
 
-  //  pDataBlockInfo->uid    = uid; // block Id may be over write by assigning uid fro this data block. Do NOT assign
-  //  the table uid
+  pDataBlockInfo->uid    = uid;
+
+#if 0
+  // for multi-group data query processing test purpose
+  pDataBlockInfo->groupId = uid;
+#endif
+
   pDataBlockInfo->rows = cur->rows;
   pDataBlockInfo->window = cur->win;
   pDataBlockInfo->numOfCols = (int32_t)(QH_GET_NUM_OF_COLS(pHandle));
diff --git a/source/libs/command/src/explain.c b/source/libs/command/src/explain.c
index 4853bb4eb3..7af4546ff3 100644
--- a/source/libs/command/src/explain.c
+++ b/source/libs/command/src/explain.c
@@ -304,8 +304,8 @@ int32_t qExplainResAppendRow(SExplainCtx *ctx, char *tbuf, int32_t len, int32_t
 
   memcpy(row.buf, tbuf, len);
   row.level = level;
-  row.len = len;
-  ctx->dataSize += len;
+  row.len   = len;
+  ctx->dataSize += row.len;
 
   if (NULL == taosArrayPush(ctx->rows, &row)) {
     qError("taosArrayPush row to explain res rows failed");
@@ -783,7 +783,7 @@ int32_t qExplainGetRspFromCtx(void *ctx, SRetrieveTableRsp **pRsp) {
   }
   
   int32_t colNum = 1;
-  int32_t rspSize = sizeof(SRetrieveTableRsp) + sizeof(int32_t) * colNum + sizeof(int32_t) * rowNum + pCtx->dataSize;
+  int32_t rspSize = sizeof(SRetrieveTableRsp) + sizeof(int32_t) + sizeof(uint64_t) + sizeof(int32_t) * colNum + sizeof(int32_t) * rowNum + pCtx->dataSize;
   SRetrieveTableRsp *rsp = (SRetrieveTableRsp *)taosMemoryCalloc(1, rspSize);
   if (NULL == rsp) {
     qError("malloc SRetrieveTableRsp failed, size:%d", rspSize);
@@ -793,29 +793,38 @@ int32_t qExplainGetRspFromCtx(void *ctx, SRetrieveTableRsp **pRsp) {
   rsp->completed = 1;
   rsp->numOfRows = htonl(rowNum);
 
-  *(int32_t *)rsp->data = htonl(pCtx->dataSize);
+  // payload length
+  *(int32_t *)rsp->data = sizeof(int32_t) + sizeof(uint64_t) + sizeof(int32_t) * colNum + sizeof(int32_t) * rowNum + pCtx->dataSize;
 
-  int32_t *offset = (int32_t *)((char *)rsp->data + sizeof(int32_t));
+  // group id
+  *(uint64_t*)(rsp->data + sizeof(int32_t)) = 0;
+
+  // column length
+  int32_t* colLength = (int32_t *)(rsp->data + sizeof(int32_t) + sizeof(uint64_t));
+
+  // varchar column offset segment
+  int32_t *offset = (int32_t *)((char *)colLength + sizeof(int32_t));
+
+  // varchar data real payload
   char *data = (char *)(offset + rowNum);
-  int32_t tOffset = 0;
-  
+
+  char* start = data;
   for (int32_t i = 0; i < rowNum; ++i) {
     SQueryExplainRowInfo *row = taosArrayGet(pCtx->rows, i);
-    *offset = tOffset;
-    tOffset += row->len;
+    offset[i] = data - start;
 
-    memcpy(data, row->buf, row->len);
-    
-    ++offset;
+    varDataCopy(data, row->buf);
+    ASSERT(varDataTLen(row->buf) == row->len);
     data += row->len;
   }
 
-  *pRsp = rsp;
+  *colLength = htonl(data - start);
+  rsp->compLen = htonl(rspSize);
 
+  *pRsp = rsp;
   return TSDB_CODE_SUCCESS;
 }
 
-
 int32_t qExplainPrepareCtx(SQueryPlan *pDag, SExplainCtx **pCtx) {
   int32_t code = 0;
   SNodeListNode *plans = NULL;
@@ -922,9 +931,7 @@ int32_t qExplainAppendPlanRows(SExplainCtx *pCtx) {
 
 int32_t qExplainGenerateRsp(SExplainCtx *pCtx, SRetrieveTableRsp **pRsp) {
   QRY_ERR_RET(qExplainAppendGroupResRows(pCtx, pCtx->rootGroupId, 0));
-
   QRY_ERR_RET(qExplainAppendPlanRows(pCtx));
-  
   QRY_ERR_RET(qExplainGetRspFromCtx(pCtx, pRsp));
 
   return TSDB_CODE_SUCCESS;
@@ -994,13 +1001,10 @@ int32_t qExecStaticExplain(SQueryPlan *pDag, SRetrieveTableRsp **pRsp) {
   SExplainCtx *pCtx = NULL;
 
   QRY_ERR_RET(qExplainPrepareCtx(pDag, &pCtx));
-  
   QRY_ERR_JRET(qExplainGenerateRsp(pCtx, pRsp));
   
 _return:
-
   qExplainFreeCtx(pCtx);
-
   QRY_RET(code);
 }
 
diff --git a/source/libs/executor/inc/executil.h b/source/libs/executor/inc/executil.h
index 834d37927a..f0cb1c1107 100644
--- a/source/libs/executor/inc/executil.h
+++ b/source/libs/executor/inc/executil.h
@@ -40,8 +40,6 @@
 
 #define GET_TASKID(_t)  (((SExecTaskInfo*)(_t))->id.str)
 
-#define curTimeWindowIndex(_winres)        ((_winres)->curIndex)
-
 typedef struct SGroupResInfo {
   int32_t totalGroup;
   int32_t currentGroup;
@@ -68,11 +66,16 @@ typedef struct SResultRowPosition {
   int32_t offset;
 } SResultRowPosition;
 
+typedef struct SResKeyPos {
+  SResultRowPosition pos;
+  uint64_t  groupId;
+  char      key[];
+} SResKeyPos;
+
 typedef struct SResultRowInfo {
   SResultRowPosition *pPosition;
   int32_t      size;       // number of result set
   int32_t      capacity;   // max capacity
-//  int32_t      curPos;     // current active result row index of pResult list
   SResultRowPosition cur;
 } SResultRowInfo;
 
@@ -135,7 +138,7 @@ typedef struct {
   int32_t colId;
 } SStddevInterResult;
 
-void    initGroupResInfo(SGroupResInfo* pGroupResInfo, SResultRowInfo* pResultInfo);
+void    initGroupedResultInfo(SGroupResInfo* pGroupResInfo, SHashObj* pHashmap, bool sortGroupResult);
 void    initMultiResInfoFromArrayList(SGroupResInfo* pGroupResInfo, SArray* pArrayList);
 
 void    cleanupGroupResInfo(SGroupResInfo* pGroupResInfo);
diff --git a/source/libs/executor/src/dataDispatcher.c b/source/libs/executor/src/dataDispatcher.c
index e897bc8892..a5ce01dba2 100644
--- a/source/libs/executor/src/dataDispatcher.c
+++ b/source/libs/executor/src/dataDispatcher.c
@@ -64,10 +64,10 @@ static bool needCompress(const SSDataBlock* pData, int32_t numOfCols) {
 }
 
 // data format:
-// +----------------+--------------------------------------+-------------+-----------+-------------+-----------+
-// |SDataCacheEntry | column#1 length, column#2 length ... | col1 bitmap | col1 data | col2 bitmap | col2 data | ....
-// |                |    sizeof(int32_t) * numOfCols       | actual size |           | actual size |           |
-// +----------------+--------------------------------------+-------------+-----------+-------------+-----------+
+// +----------------+--------------+----------+--------------------------------------+-------------+-----------+-------------+-----------+
+// |SDataCacheEntry | total length | group id | column#1 length, column#2 length ... | col1 bitmap | col1 data | col2 bitmap | col2 data | ....
+// |                |  (4 bytes)   |(8 bytes) | sizeof(int32_t) * numOfCols          | actual size |           | actual size |           |
+// +----------------+--------------+----------+--------------------------------------+-------------+-----------+-------------+-----------+
 // The length of bitmap is decided by number of rows of this data block, and the length of each column data is
 // recorded in the first segment, next to the struct header
 static void toDataCacheEntry(const SDataDispatchHandle* pHandle, const SInputData* pInput, SDataDispatchBuf* pBuf) {
diff --git a/source/libs/executor/src/executil.c b/source/libs/executor/src/executil.c
index 98b72cf4c2..c3fa777779 100644
--- a/source/libs/executor/src/executil.c
+++ b/source/libs/executor/src/executil.c
@@ -186,12 +186,50 @@ void cleanupGroupResInfo(SGroupResInfo* pGroupResInfo) {
   pGroupResInfo->index     = 0;
 }
 
-void initGroupResInfo(SGroupResInfo* pGroupResInfo, SResultRowInfo* pResultInfo) {
+static int32_t resultrowCompar1(const void* p1, const void* p2) {
+  SResKeyPos* pp1 = *(SResKeyPos**) p1;
+  SResKeyPos* pp2 = *(SResKeyPos**) p2;
+
+  if (pp1->groupId == pp2->groupId) {
+    int64_t pts1 = *(int64_t*) pp1->key;
+    int64_t pts2 = *(int64_t*) pp2->key;
+
+    if (pts1 == pts2) {
+      return 0;
+    } else {
+      return pts1 < pts2? -1:1;
+    }
+  } else {
+    return pp1->groupId < pp2->groupId? -1:1;
+  }
+}
+
+void initGroupedResultInfo(SGroupResInfo* pGroupResInfo, SHashObj* pHashmap, bool sortGroupResult) {
   if (pGroupResInfo->pRows != NULL) {
     taosArrayDestroy(pGroupResInfo->pRows);
   }
 
-  pGroupResInfo->pRows = taosArrayFromList(pResultInfo->pPosition, pResultInfo->size, sizeof(SResultRowPosition));
+  // extract the result rows information from the hash map
+  void* pData = NULL;
+  pGroupResInfo->pRows = taosArrayInit(10, POINTER_BYTES);
+
+  size_t keyLen = 0;
+  while((pData = taosHashIterate(pHashmap, pData)) != NULL) {
+    void* key = taosHashGetKey(pData, &keyLen);
+
+    SResKeyPos* p = taosMemoryMalloc(keyLen + sizeof(SResultRowPosition));
+
+    p->groupId = *(uint64_t*) key;
+    p->pos = *(SResultRowPosition*) pData;
+    memcpy(p->key, key + sizeof(uint64_t), keyLen - sizeof(uint64_t));
+
+    taosArrayPush(pGroupResInfo->pRows, &p);
+  }
+
+  if (sortGroupResult) {
+    qsort(pGroupResInfo->pRows->pData, taosArrayGetSize(pGroupResInfo->pRows), POINTER_BYTES, resultrowCompar1);
+  }
+
   pGroupResInfo->index = 0;
   assert(pGroupResInfo->index <= getNumOfTotalRes(pGroupResInfo));
 }
diff --git a/source/libs/executor/src/executorimpl.c b/source/libs/executor/src/executorimpl.c
index b28dadb594..be3e95224b 100644
--- a/source/libs/executor/src/executorimpl.c
+++ b/source/libs/executor/src/executorimpl.c
@@ -431,6 +431,13 @@ SResultRow* getNewResultRow_rv(SDiskbasedBuf* pResultBuf, int64_t tableGroupId,
   return pResultRow;
 }
 
+/**
+ * the struct of key in hash table
+ * +----------+---------------+
+ * | group id |   key data    |
+ * | 8 bytes  | actual length |
+ * +----------+---------------+
+ */
 static SResultRow* doSetResultOutBufByKey_rv(SDiskbasedBuf* pResultBuf, SResultRowInfo* pResultRowInfo, int64_t uid,
                                              char* pData, int16_t bytes, bool masterscan, uint64_t groupId,
                                              SExecTaskInfo* pTaskInfo, bool isIntervalQuery, SAggSupporter* pSup) {
@@ -1447,7 +1454,7 @@ static SArray* hashIntervalAgg(SOperatorInfo* pOperatorInfo, SResultRowInfo* pRe
 
   SArray* pUpdated = NULL;
   if (pInfo->execModel == OPTR_EXEC_MODEL_STREAM) {
-    pUpdated = taosArrayInit(4, sizeof(SResultRowPosition));
+    pUpdated = taosArrayInit(4, POINTER_BYTES);
   }
 
   int32_t step = 1;
@@ -1459,8 +1466,6 @@ static SArray* hashIntervalAgg(SOperatorInfo* pOperatorInfo, SResultRowInfo* pRe
   if (pSDataBlock->pDataBlock != NULL) {
     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);
   }
 
   int32_t startPos = ascScan? 0 : (pSDataBlock->info.rows - 1);
@@ -1478,7 +1483,11 @@ static SArray* hashIntervalAgg(SOperatorInfo* pOperatorInfo, SResultRowInfo* pRe
   }
 
   if (pInfo->execModel == OPTR_EXEC_MODEL_STREAM) {
-    SResultRowPosition pos = {.pageId = pResult->pageId, .offset = pResult->offset};
+    SResKeyPos* pos = taosMemoryMalloc(sizeof(SResKeyPos) + sizeof(uint64_t));
+    pos->groupId = tableGroupId;
+    pos->pos     = (SResultRowPosition) {.pageId = pResult->pageId, .offset = pResult->offset};
+    *(int64_t*) pos->key = pResult->win.skey;
+
     taosArrayPush(pUpdated, &pos);
   }
 
@@ -1550,7 +1559,11 @@ static SArray* hashIntervalAgg(SOperatorInfo* pOperatorInfo, SResultRowInfo* pRe
     }
 
     if (pInfo->execModel == OPTR_EXEC_MODEL_STREAM) {
-      SResultRowPosition pos = {.pageId = pResult->pageId, .offset = pResult->offset};
+      SResKeyPos* pos = taosMemoryMalloc(sizeof(SResKeyPos) + sizeof(uint64_t));
+      pos->groupId = tableGroupId;
+      pos->pos     = (SResultRowPosition) {.pageId = pResult->pageId, .offset = pResult->offset};
+      *(int64_t*) pos->key = pResult->win.skey;
+
       taosArrayPush(pUpdated, &pos);
     }
 
@@ -2812,6 +2825,7 @@ void setTaskStatus(SExecTaskInfo* pTaskInfo, int8_t status) {
   }
 }
 
+// todo merged with the build group result.
 void finalizeMultiTupleQueryResult(SqlFunctionCtx* pCtx, int32_t numOfOutput, SDiskbasedBuf* pBuf,
                                    SResultRowInfo* pResultRowInfo, int32_t* rowCellInfoOffset) {
   for (int32_t i = 0; i < pResultRowInfo->size; ++i) {
@@ -2846,40 +2860,36 @@ void finalizeMultiTupleQueryResult(SqlFunctionCtx* pCtx, int32_t numOfOutput, SD
   }
 }
 
+// todo merged with the build group result.
 void finalizeUpdatedResult(SqlFunctionCtx* pCtx, int32_t numOfOutput, SDiskbasedBuf* pBuf, SArray* pUpdateList,
                            int32_t* rowCellInfoOffset) {
   size_t num = taosArrayGetSize(pUpdateList);
 
   for (int32_t i = 0; i < num; ++i) {
-    SResultRowPosition* pPos = taosArrayGet(pUpdateList, i);
-
-    SFilePage*  bufPage = getBufPage(pBuf, pPos->pageId);
-    SResultRow* pRow = (SResultRow*)((char*)bufPage + pPos->offset);
+    SResKeyPos * pPos = taosArrayGetP(pUpdateList, i);
 
+    SFilePage*  bufPage = getBufPage(pBuf, pPos->pos.pageId);
+    SResultRow* pRow = (SResultRow*)((char*)bufPage + pPos->pos.offset);
+//
     for (int32_t j = 0; j < numOfOutput; ++j) {
       pCtx[j].resultInfo = getResultCell(pRow, j, rowCellInfoOffset);
-
+//
       struct SResultRowEntryInfo* pResInfo = pCtx[j].resultInfo;
-      if (isRowEntryCompleted(pResInfo) && isRowEntryInitialized(pResInfo)) {
-        continue;
-      }
-
-      if (pCtx[j].fpSet.process) {  // TODO set the dummy function.
-//        pCtx[j].fpSet.finalize(&pCtx[j]);
-        pResInfo->initialized = true;
-      }
-
+//      if (isRowEntryCompleted(pResInfo) && isRowEntryInitialized(pResInfo)) {
+//        continue;
+//      }
+//
+//      if (pCtx[j].fpSet.process) {  // TODO set the dummy function.
+////        pCtx[j].fpSet.finalize(&pCtx[j]);
+//        pResInfo->initialized = true;
+//      }
+//
       if (pRow->numOfRows < pResInfo->numOfRes) {
         pRow->numOfRows = pResInfo->numOfRes;
       }
     }
 
     releaseBufPage(pBuf, bufPage);
-    /*
-     * set the number of output results for group by normal columns, the number of output rows usually is 1 except
-     * the top and bottom query
-     */
-    //    buf->numOfRows = (uint16_t)getNumOfResult(pCtx, numOfOutput);
   }
 }
 
@@ -3092,7 +3102,6 @@ void setIntervalQueryRange(STableQueryInfo* pTableQueryInfo, TSKEY key, STimeWin
 }
 
 /**
- * copyToOutputBuf support copy data in ascending/descending order
  * For interval query of both super table and table, copy the data in ascending order, since the output results are
  * ordered in SWindowResutl already. While handling the group by query for both table and super table,
  * all group result are completed already.
@@ -3101,7 +3110,7 @@ void setIntervalQueryRange(STableQueryInfo* pTableQueryInfo, TSKEY key, STimeWin
  * @param result
  */
 int32_t doCopyToSDataBlock(SSDataBlock* pBlock, SExprInfo* pExprInfo, SDiskbasedBuf* pBuf, SGroupResInfo* pGroupResInfo,
-    int32_t orderType, int32_t* rowCellOffset, SqlFunctionCtx* pCtx) {
+                           int32_t orderType, int32_t* rowCellOffset, SqlFunctionCtx* pCtx) {
   int32_t numOfRows = getNumOfTotalRes(pGroupResInfo);
   int32_t numOfResult = pBlock->info.rows;  // there are already exists result rows
 
@@ -3120,10 +3129,10 @@ int32_t doCopyToSDataBlock(SSDataBlock* pBlock, SExprInfo* pExprInfo, SDiskbased
   }
 
   for (int32_t i = start; (i < numOfRows) && (i >= 0); i += step) {
-    SResultRowPosition* pPos = taosArrayGet(pGroupResInfo->pRows, i);
-    SFilePage*          page = getBufPage(pBuf, pPos->pageId);
+    SResKeyPos *pPos = taosArrayGetP(pGroupResInfo->pRows, i);
+    SFilePage*          page = getBufPage(pBuf, pPos->pos.pageId);
 
-    SResultRow* pRow = (SResultRow*)((char*)page + pPos->offset);
+    SResultRow* pRow = (SResultRow*)((char*)page + pPos->pos.offset);
     if (pRow->numOfRows == 0) {
       pGroupResInfo->index += 1;
       continue;
@@ -3767,9 +3776,15 @@ int32_t setSDataBlockFromFetchRsp(SSDataBlock* pRes, SLoadRemoteDataInfo* pLoadI
   blockDataEnsureCapacity(pRes, numOfRows);
 
   if (pColList == NULL) {  // data from other sources
-    int32_t* colLen = (int32_t*)pData;
-    char*    pStart = pData + sizeof(int32_t) * numOfOutput;
+    int32_t dataLen = *(int32_t*) pData;
+    pData += sizeof(int32_t);
 
+    pRes->info.groupId = *(uint64_t*) pData;
+    pData += sizeof(uint64_t);
+
+    int32_t* colLen = (int32_t*)pData;
+
+    char* pStart = pData + sizeof(int32_t) * numOfOutput;
     for (int32_t i = 0; i < numOfOutput; ++i) {
       colLen[i] = htonl(colLen[i]);
       ASSERT(colLen[i] > 0);
@@ -3822,7 +3837,11 @@ int32_t setSDataBlockFromFetchRsp(SSDataBlock* pRes, SLoadRemoteDataInfo* pLoadI
 
     blockDataEnsureCapacity(&block, numOfRows);
 
-    int32_t* colLen = (int32_t*) pStart;
+    int32_t dataLen = *(int32_t*) pStart;
+    uint64_t groupId = *(uint64_t*) (pStart + sizeof(int32_t));
+    pStart += sizeof(int32_t) + sizeof(uint64_t);
+
+    int32_t* colLen = (int32_t*) (pStart);
     pStart += sizeof(int32_t) * numOfCols;
 
     for (int32_t i = 0; i < numOfCols; ++i) {
@@ -4277,18 +4296,6 @@ static void assignExprInfo(SExprInfo* dst, const SExprInfo* src) {
   //  }
 }
 
-static SExprInfo* exprArrayDup(SArray* pExprList) {
-  size_t numOfOutput = taosArrayGetSize(pExprList);
-
-  SExprInfo* p = taosMemoryCalloc(numOfOutput, sizeof(SExprInfo));
-  for (int32_t i = 0; i < numOfOutput; ++i) {
-    SExprInfo* pExpr = taosArrayGetP(pExprList, i);
-    assignExprInfo(&p[i], pExpr);
-  }
-
-  return p;
-}
-
 // TODO merge aggregate super table
 static void appendOneRowToDataBlock(SSDataBlock* pBlock, STupleHandle* pTupleHandle) {
   for (int32_t i = 0; i < pBlock->info.numOfCols; ++i) {
@@ -4779,7 +4786,7 @@ static int32_t doOpenAggregateOptr(SOperatorInfo* pOperator) {
   finalizeMultiTupleQueryResult(pAggInfo->binfo.pCtx, pOperator->numOfOutput, pAggInfo->aggSup.pResultBuf,
                                 &pAggInfo->binfo.resultRowInfo, pAggInfo->binfo.rowCellInfoOffset);
 
-  initGroupResInfo(&pAggInfo->groupResInfo, &pAggInfo->binfo.resultRowInfo);
+  initGroupedResultInfo(&pAggInfo->groupResInfo, pAggInfo->aggSup.pResultRowHashTable, false);
   OPTR_SET_OPENED(pOperator);
   return TSDB_CODE_SUCCESS;
 }
@@ -5077,7 +5084,7 @@ static int32_t doOpenIntervalAgg(SOperatorInfo* pOperator) {
     STableQueryInfo* pTableQueryInfo = pInfo->pCurrent;
 
     setIntervalQueryRange(pTableQueryInfo, pBlock->info.window.skey, &pTaskInfo->window);
-    hashIntervalAgg(pOperator, &pInfo->binfo.resultRowInfo, pBlock, 0);
+    hashIntervalAgg(pOperator, &pInfo->binfo.resultRowInfo, pBlock, pBlock->info.groupId);
 
 #if 0   // test for encode/decode result info
     if(pOperator->encodeResultRow){
@@ -5099,7 +5106,7 @@ static int32_t doOpenIntervalAgg(SOperatorInfo* pOperator) {
   finalizeMultiTupleQueryResult(pInfo->binfo.pCtx, pOperator->numOfOutput, pInfo->aggSup.pResultBuf,
                                 &pInfo->binfo.resultRowInfo, pInfo->binfo.rowCellInfoOffset);
 
-  initGroupResInfo(&pInfo->groupResInfo, &pInfo->binfo.resultRowInfo);
+  initGroupedResultInfo(&pInfo->groupResInfo, pInfo->aggSup.pResultRowHashTable, true);
   OPTR_SET_OPENED(pOperator);
   return TSDB_CODE_SUCCESS;
 }
@@ -5224,7 +5231,7 @@ static SSDataBlock* doAllIntervalAgg(SOperatorInfo *pOperator, bool* newgroup) {
   setTaskStatus(pOperator->pTaskInfo, TASK_COMPLETED);
 //  finalizeQueryResult(pSliceInfo->binfo.pCtx, pOperator->numOfOutput);
 
-  initGroupResInfo(&pSliceInfo->groupResInfo, &pSliceInfo->binfo.resultRowInfo);
+//  initGroupedResultInfo(&pSliceInfo->groupResInfo, &pSliceInfo->binfo.resultRowInfo);
   //  doBuildResultDatablock(&pRuntimeEnv->groupResInfo, pRuntimeEnv, pSliceInfo->pRes);
 
   if (pSliceInfo->binfo.pRes->info.rows == 0 || !hasRemainDataInCurrentGroup(&pSliceInfo->groupResInfo)) {
@@ -5275,7 +5282,7 @@ static SSDataBlock* doSTableIntervalAgg(SOperatorInfo* pOperator, bool* newgroup
   finalizeMultiTupleQueryResult(pInfo->binfo.pCtx, pOperator->numOfOutput, pInfo->aggSup.pResultBuf,
                                 &pInfo->binfo.resultRowInfo, pInfo->binfo.rowCellInfoOffset);
 
-  initGroupResInfo(&pInfo->groupResInfo, &pInfo->binfo.resultRowInfo);
+//  initGroupedResultInfo(&pInfo->groupResInfo, &pInfo->binfo.resultRowInfo);
   OPTR_SET_OPENED(pOperator);
 
   blockDataEnsureCapacity(pInfo->binfo.pRes, pOperator->resultInfo.capacity);
@@ -5400,7 +5407,7 @@ static SSDataBlock* doStateWindowAgg(SOperatorInfo* pOperator, bool* newgroup) {
   closeAllResultRows(&pBInfo->resultRowInfo);
   finalizeMultiTupleQueryResult(pBInfo->pCtx, pOperator->numOfOutput, pInfo->aggSup.pResultBuf, &pBInfo->resultRowInfo, pBInfo->rowCellInfoOffset);
 
-  initGroupResInfo(&pInfo->groupResInfo, &pBInfo->resultRowInfo);
+  initGroupedResultInfo(&pInfo->groupResInfo, pInfo->aggSup.pResultRowHashTable, true);
   blockDataEnsureCapacity(pBInfo->pRes, pOperator->resultInfo.capacity);
   doBuildResultDatablock(pBInfo->pRes, &pInfo->groupResInfo, pOperator->pExpr, pInfo->aggSup.pResultBuf, pBInfo->rowCellInfoOffset, pInfo->binfo.pCtx);
   if (pBInfo->pRes->info.rows == 0 || !hasRemainDataInCurrentGroup(&pInfo->groupResInfo)) {
@@ -5449,7 +5456,7 @@ static SSDataBlock* doSessionWindowAgg(SOperatorInfo* pOperator, bool* newgroup)
   closeAllResultRows(&pBInfo->resultRowInfo);
   finalizeMultiTupleQueryResult(pBInfo->pCtx, pOperator->numOfOutput, pInfo->aggSup.pResultBuf, &pBInfo->resultRowInfo, pBInfo->rowCellInfoOffset);
 
-  initGroupResInfo(&pInfo->groupResInfo, &pBInfo->resultRowInfo);
+  initGroupedResultInfo(&pInfo->groupResInfo, pInfo->aggSup.pResultRowHashTable, true);
   blockDataEnsureCapacity(pBInfo->pRes, pOperator->resultInfo.capacity);
   doBuildResultDatablock(pBInfo->pRes, &pInfo->groupResInfo, pOperator->pExpr, pInfo->aggSup.pResultBuf, pBInfo->rowCellInfoOffset, pInfo->binfo.pCtx);
   if (pBInfo->pRes->info.rows == 0 || !hasRemainDataInCurrentGroup(&pInfo->groupResInfo)) {
@@ -5881,7 +5888,8 @@ SOperatorInfo* createIntervalOperatorInfo(SOperatorInfo* downstream, SExprInfo*
 
   pInfo->order          = TSDB_ORDER_ASC;
   pInfo->interval       = *pInterval;
-  pInfo->execModel      = pTaskInfo->execModel;
+  pInfo->execModel      = OPTR_EXEC_MODEL_STREAM;
+//  pInfo->execModel      = pTaskInfo->execModel;
   pInfo->win            = pTaskInfo->window;
   pInfo->twAggSup       = *pTwAggSupp;
   pInfo->primaryTsIndex = primaryTsSlotId;
@@ -6492,7 +6500,8 @@ SOperatorInfo* createOperatorTree(SPhysiNode* pPhyNode, SExecTaskInfo* pTaskInfo
       };
 
       return createTableScanOperatorInfo(pDataReader, pScanPhyNode->order, numOfCols, pTableScanNode->dataRequired,
-          pScanPhyNode->count, pScanPhyNode->reverse, pColList, pResBlock, pScanPhyNode->node.pConditions, &interval, pTableScanNode->ratio, pTaskInfo);
+          pScanPhyNode->count, pScanPhyNode->reverse, pColList, pResBlock, pScanPhyNode->node.pConditions, &interval, pTableScanNode->ratio,
+          pTaskInfo);
     } else if (QUERY_NODE_PHYSICAL_PLAN_EXCHANGE == type) {
       SExchangePhysiNode* pExchange = (SExchangePhysiNode*)pPhyNode;
       SSDataBlock*        pResBlock = createResDataBlock(pExchange->node.pOutputDataBlockDesc);
@@ -6895,8 +6904,7 @@ int32_t createExecTaskInfoImpl(SSubplan* pPlan, SExecTaskInfo** pTaskInfo, SRead
     goto _complete;
   }
 
-  STableGroupInfo group = {0};
-  (*pTaskInfo)->pRoot = createOperatorTree(pPlan->pNode, *pTaskInfo, pHandle, queryId, taskId, &group);
+  (*pTaskInfo)->pRoot = createOperatorTree(pPlan->pNode, *pTaskInfo, pHandle, queryId, taskId, &(*pTaskInfo)->tableqinfoGroupInfo);
   if (NULL == (*pTaskInfo)->pRoot) {
     code = terrno;
     goto _complete;
diff --git a/source/libs/executor/src/groupoperator.c b/source/libs/executor/src/groupoperator.c
index 8a0da52a8e..3ea51b61e8 100644
--- a/source/libs/executor/src/groupoperator.c
+++ b/source/libs/executor/src/groupoperator.c
@@ -308,7 +308,7 @@ static SSDataBlock* hashGroupbyAggregate(SOperatorInfo* pOperator, bool* newgrou
   //  }
 
   blockDataEnsureCapacity(pRes, pOperator->resultInfo.capacity);
-  initGroupResInfo(&pInfo->groupResInfo, &pInfo->binfo.resultRowInfo);
+  initGroupedResultInfo(&pInfo->groupResInfo, pInfo->aggSup.pResultRowHashTable, false);
 
   while(1) {
     doBuildResultDatablock(pRes, &pInfo->groupResInfo, pOperator->pExpr, pInfo->aggSup.pResultBuf, pInfo->binfo.rowCellInfoOffset, pInfo->binfo.pCtx);
diff --git a/source/libs/executor/src/scanoperator.c b/source/libs/executor/src/scanoperator.c
index ce3de02c9f..4d5ea6cc7a 100644
--- a/source/libs/executor/src/scanoperator.c
+++ b/source/libs/executor/src/scanoperator.c
@@ -271,9 +271,7 @@ static void setupEnvForReverseScan(STableScanInfo* pTableScanInfo, SqlFunctionCt
 static SSDataBlock* doTableScanImpl(SOperatorInfo* pOperator, bool* newgroup) {
   STableScanInfo* pTableScanInfo = pOperator->info;
 
-  SSDataBlock*     pBlock = pTableScanInfo->pResBlock;
-  STableGroupInfo* pTableGroupInfo = &pOperator->pTaskInfo->tableqinfoGroupInfo;
-
+  SSDataBlock* pBlock = pTableScanInfo->pResBlock;
   *newgroup = false;
 
   while (tsdbNextDataBlock(pTableScanInfo->dataReader)) {
@@ -284,18 +282,6 @@ static SSDataBlock* doTableScanImpl(SOperatorInfo* pOperator, bool* newgroup) {
     pTableScanInfo->numOfBlocks += 1;
     tsdbRetrieveDataBlockInfo(pTableScanInfo->dataReader, &pBlock->info);
 
-    // todo opt
-    //    if (pTableGroupInfo->numOfTables > 1 || (pRuntimeEnv->current == NULL && pTableGroupInfo->numOfTables == 1)) {
-    //      STableQueryInfo** pTableQueryInfo =
-    //          (STableQueryInfo**)taosHashGet(pTableGroupInfo->map, &pBlock->info.uid, sizeof(pBlock->info.uid));
-    //      if (pTableQueryInfo == NULL) {
-    //        break;
-    //      }
-    //
-    //      doTableQueryInfoTimeWindowCheck(pTaskInfo, *pTableQueryInfo, pTableScanInfo->order);
-    //    }
-
-    // this function never returns error?
     uint32_t status = 0;
     int32_t  code = loadDataBlock(pOperator, pTableScanInfo, pBlock, &status);
     //    int32_t  code = loadDataBlockOnDemand(pOperator->pRuntimeEnv, pTableScanInfo, pBlock, &status);
@@ -308,6 +294,8 @@ static SSDataBlock* doTableScanImpl(SOperatorInfo* pOperator, bool* newgroup) {
       continue;
     }
 
+    // reset the block to be 0 by default, this blockId is assigned by physical plan and is used by direct upstream operator.
+    pBlock->info.blockId = 0;
     return pBlock;
   }
 
@@ -405,11 +393,11 @@ SOperatorInfo* createTableScanOperatorInfo(void* pDataReader, int32_t order, int
   pOperator->name         = "TableScanOperator";
   pOperator->operatorType = QUERY_NODE_PHYSICAL_PLAN_TABLE_SCAN;
   pOperator->blockingOptr = false;
-  pOperator->status = OP_NOT_OPENED;
-  pOperator->info = pInfo;
-  pOperator->numOfOutput = numOfOutput;
-  pOperator->getNextFn = doTableScan;
-  pOperator->pTaskInfo = pTaskInfo;
+  pOperator->status       = OP_NOT_OPENED;
+  pOperator->info         = pInfo;
+  pOperator->numOfOutput  = numOfOutput;
+  pOperator->getNextFn    = doTableScan;
+  pOperator->pTaskInfo    = pTaskInfo;
 
   static int32_t cost = 0;
   pOperator->cost.openCost = ++cost;
@@ -823,12 +811,12 @@ static SSDataBlock* doSysTableScan(SOperatorInfo* pOperator, bool* newgroup) {
     int32_t          tableNameSlotId = 1;
     SColumnInfoData* pTableNameCol = taosArrayGet(pInfo->pRes->pDataBlock, tableNameSlotId);
 
-    char*   name = NULL;
+    char*   tb = NULL;
     int32_t numOfRows = 0;
 
     char n[TSDB_TABLE_NAME_LEN] = {0};
-    while ((name = metaTbCursorNext(pInfo->pCur)) != NULL) {
-      STR_TO_VARSTR(n, name);
+    while ((tb = metaTbCursorNext(pInfo->pCur)) != NULL) {
+      STR_TO_VARSTR(n, tb);
       colDataAppend(pTableNameCol, numOfRows, n, false);
       numOfRows += 1;
       if (numOfRows >= pInfo->capacity) {
diff --git a/source/libs/parser/src/parTranslater.c b/source/libs/parser/src/parTranslater.c
index 8506cfc33d..85cba79510 100644
--- a/source/libs/parser/src/parTranslater.c
+++ b/source/libs/parser/src/parTranslater.c
@@ -3600,7 +3600,9 @@ static int32_t setQuery(STranslateContext* pCxt, SQuery* pQuery) {
       return TSDB_CODE_OUT_OF_MEMORY;
     }
 
-    pQuery->precision = extractResultTsPrecision((SSelectStmt*)pQuery->pRoot);
+    if (nodeType(pQuery->pRoot) == QUERY_NODE_SELECT_STMT) {
+      pQuery->precision = extractResultTsPrecision((SSelectStmt*)pQuery->pRoot);
+    }
   }
 
   if (NULL != pCxt->pDbs) {
diff --git a/source/util/src/tarray.c b/source/util/src/tarray.c
index 1c655fc2bf..2d741b18f6 100644
--- a/source/util/src/tarray.c
+++ b/source/util/src/tarray.c
@@ -476,6 +476,7 @@ void* taosDecodeArray(const void* buf, SArray** pArray, FDecode decode, int32_t
   return (void*)buf;
 }
 
+// todo remove it
 // order array<type *>
 void taosArraySortPWithExt(SArray* pArray, __ext_compar_fn_t fn, const void* param) {
   taosArrayGetSize(pArray) > 8 ? taosArrayQuickSort(pArray, fn, param) : taosArrayInsertSort(pArray, fn, param);