diff --git a/source/dnode/vnode/src/inc/vnodeInt.h b/source/dnode/vnode/src/inc/vnodeInt.h
index 40215bb68e..b58248d091 100644
--- a/source/dnode/vnode/src/inc/vnodeInt.h
+++ b/source/dnode/vnode/src/inc/vnodeInt.h
@@ -96,7 +96,7 @@ int32_t      tsdbUpdateSmaWindow(STsdb* pTsdb, SSubmitReq* pMsg, int64_t version
 int32_t      tsdbCreateTSma(STsdb* pTsdb, char* pMsg);
 int32_t      tsdbInsertTSmaData(STsdb* pTsdb, int64_t indexUid, const char* msg);
 int          tsdbInsertData(STsdb* pTsdb, int64_t version, SSubmitReq* pMsg, SSubmitRsp* pRsp);
-tsdbReaderT* tsdbQueryTablesT(STsdb* tsdb, SQueryTableDataCond* pCond, STableGroupInfo* groupList, uint64_t qId,
+tsdbReaderT* tsdbQueryTables(SVnode* pVnode, SQueryTableDataCond* pCond, STableGroupInfo* groupList, uint64_t qId,
                               uint64_t taskId);
 tsdbReaderT  tsdbQueryCacheLastT(STsdb* tsdb, SQueryTableDataCond* pCond, STableGroupInfo* groupList, uint64_t qId,
                                  void* pMemRef);
diff --git a/source/dnode/vnode/src/tsdb/tsdbRead.c b/source/dnode/vnode/src/tsdb/tsdbRead.c
index cb91596cb4..19512c95f3 100644
--- a/source/dnode/vnode/src/tsdb/tsdbRead.c
+++ b/source/dnode/vnode/src/tsdb/tsdbRead.c
@@ -130,6 +130,7 @@ typedef struct STsdbReadHandle {
   SArray*        prev;  // previous row which is before than time window
   SArray*        next;  // next row which is after the query time window
   SIOCostSummary cost;
+  STSchema*      pSchema;
 } STsdbReadHandle;
 
 typedef struct STableGroupSupporter {
@@ -343,14 +344,14 @@ static void setQueryTimewindow(STsdbReadHandle* pTsdbReadHandle, SQueryTableData
   }
 }
 
-static STsdbReadHandle* tsdbQueryTablesImpl(STsdb* tsdb, SQueryTableDataCond* pCond, uint64_t qId, uint64_t taskId) {
+static STsdbReadHandle* tsdbQueryTablesImpl(SVnode* pVnode, SQueryTableDataCond* pCond, uint64_t qId, uint64_t taskId) {
   STsdbReadHandle* pReadHandle = taosMemoryCalloc(1, sizeof(STsdbReadHandle));
   if (pReadHandle == NULL) {
     goto _end;
   }
 
   pReadHandle->order = pCond->order;
-  pReadHandle->pTsdb = tsdb;
+  pReadHandle->pTsdb = pVnode->pTsdb;
   pReadHandle->type = TSDB_QUERY_TYPE_ALL;
   pReadHandle->cur.fid = INT32_MIN;
   pReadHandle->cur.win = TSWINDOW_INITIALIZER;
@@ -368,7 +369,7 @@ static STsdbReadHandle* tsdbQueryTablesImpl(STsdb* tsdb, SQueryTableDataCond* pC
   snprintf(buf, tListLen(buf), "TID:0x%" PRIx64 " QID:0x%" PRIx64, taskId, qId);
   pReadHandle->idStr = strdup(buf);
 
-  if (tsdbInitReadH(&pReadHandle->rhelper, (STsdb*)tsdb) != 0) {
+  if (tsdbInitReadH(&pReadHandle->rhelper, (STsdb*)pVnode->pTsdb) != 0) {
     goto _end;
   }
 
@@ -422,9 +423,10 @@ _end:
   return NULL;
 }
 
-tsdbReaderT* tsdbQueryTablesT(STsdb* tsdb, SQueryTableDataCond* pCond, STableGroupInfo* groupList, uint64_t qId,
+tsdbReaderT* tsdbQueryTables(SVnode* pVnode, SQueryTableDataCond* pCond, STableGroupInfo* groupList, uint64_t qId,
                              uint64_t taskId) {
-  STsdbReadHandle* pTsdbReadHandle = tsdbQueryTablesImpl(tsdb, pCond, qId, taskId);
+
+  STsdbReadHandle* pTsdbReadHandle = tsdbQueryTablesImpl(pVnode, pCond, qId, taskId);
   if (pTsdbReadHandle == NULL) {
     return NULL;
   }
@@ -441,6 +443,9 @@ tsdbReaderT* tsdbQueryTablesT(STsdb* tsdb, SQueryTableDataCond* pCond, STableGro
     return NULL;
   }
 
+  STableCheckInfo *pCheckInfo = taosArrayGet(pTsdbReadHandle->pTableCheckInfo, 0);
+  pTsdbReadHandle->pSchema = metaGetTbTSchema(pVnode->pMeta, pCheckInfo->tableId, 0);
+
   tsdbDebug("%p total numOfTable:%" PRIzu " in this query, group %" PRIzu " %s", pTsdbReadHandle,
             taosArrayGetSize(pTsdbReadHandle->pTableCheckInfo), taosArrayGetSize(groupList->pGroupList),
             pTsdbReadHandle->idStr);
@@ -526,7 +531,7 @@ void tsdbResetQueryHandleForNewTable(tsdbReaderT queryHandle, SQueryTableDataCon
   //  pTsdbReadHandle->next = doFreeColumnInfoData(pTsdbReadHandle->next);
 }
 
-tsdbReaderT tsdbQueryLastRow(STsdb* tsdb, SQueryTableDataCond* pCond, STableGroupInfo* groupList, uint64_t qId,
+tsdbReaderT tsdbQueryLastRow(SVnode* pVnode, SQueryTableDataCond* pCond, STableGroupInfo* groupList, uint64_t qId,
                              uint64_t taskId) {
   pCond->twindow = updateLastrowForEachGroup(groupList);
 
@@ -535,7 +540,7 @@ tsdbReaderT tsdbQueryLastRow(STsdb* tsdb, SQueryTableDataCond* pCond, STableGrou
     return NULL;
   }
 
-  STsdbReadHandle* pTsdbReadHandle = (STsdbReadHandle*)tsdbQueryTablesT(tsdb, pCond, groupList, qId, taskId);
+  STsdbReadHandle* pTsdbReadHandle = (STsdbReadHandle*)tsdbQueryTables(pVnode, pCond, groupList, qId, taskId);
   if (pTsdbReadHandle == NULL) {
     return NULL;
   }
@@ -618,7 +623,7 @@ static STableGroupInfo* trimTableGroup(STimeWindow* window, STableGroupInfo* pGr
   return pNew;
 }
 
-tsdbReaderT tsdbQueryRowsInExternalWindow(STsdb* tsdb, SQueryTableDataCond* pCond, STableGroupInfo* groupList,
+tsdbReaderT tsdbQueryRowsInExternalWindow(SVnode* pVnode, SQueryTableDataCond* pCond, STableGroupInfo* groupList,
                                           uint64_t qId, uint64_t taskId) {
   STableGroupInfo* pNew = trimTableGroup(&pCond->twindow, groupList);
 
@@ -634,7 +639,7 @@ tsdbReaderT tsdbQueryRowsInExternalWindow(STsdb* tsdb, SQueryTableDataCond* pCon
     }
   }
 
-  STsdbReadHandle* pTsdbReadHandle = (STsdbReadHandle*)tsdbQueryTablesT(tsdb, pCond, pNew, qId, taskId);
+  STsdbReadHandle* pTsdbReadHandle = (STsdbReadHandle*)tsdbQueryTables(pVnode, pCond, pNew, qId, taskId);
   pTsdbReadHandle->loadExternalRow = true;
   pTsdbReadHandle->currentLoadExternalRows = true;
 
@@ -986,7 +991,7 @@ static int32_t loadBlockInfo(STsdbReadHandle* pTsdbReadHandle, int32_t index, in
   pCheckInfo->numOfBlocks = 0;
 
   STable table = {.uid = pCheckInfo->tableId, .tid = pCheckInfo->tableId};
-  table.pSchema = metaGetTbTSchema(REPO_META(pTsdbReadHandle->pTsdb), pCheckInfo->tableId, 0);
+  table.pSchema = pTsdbReadHandle->pSchema;
 
   if (tsdbSetReadTable(&pTsdbReadHandle->rhelper, &table) != TSDB_CODE_SUCCESS) {
     code = terrno;
@@ -1091,22 +1096,21 @@ static int32_t doLoadFileDataBlock(STsdbReadHandle* pTsdbReadHandle, SBlock* pBl
                                    int32_t slotIndex) {
   int64_t st = taosGetTimestampUs();
 
-  STSchema* pSchema = metaGetTbTSchema(REPO_META(pTsdbReadHandle->pTsdb), pCheckInfo->tableId, 0);
-  int32_t   code = tdInitDataCols(pTsdbReadHandle->pDataCols, pSchema);
+  int32_t   code = tdInitDataCols(pTsdbReadHandle->pDataCols, pTsdbReadHandle->pSchema);
   if (code != TSDB_CODE_SUCCESS) {
     tsdbError("%p failed to malloc buf for pDataCols, %s", pTsdbReadHandle, pTsdbReadHandle->idStr);
     terrno = TSDB_CODE_TDB_OUT_OF_MEMORY;
     goto _error;
   }
 
-  code = tdInitDataCols(pTsdbReadHandle->rhelper.pDCols[0], pSchema);
+  code = tdInitDataCols(pTsdbReadHandle->rhelper.pDCols[0], pTsdbReadHandle->pSchema);
   if (code != TSDB_CODE_SUCCESS) {
     tsdbError("%p failed to malloc buf for rhelper.pDataCols[0], %s", pTsdbReadHandle, pTsdbReadHandle->idStr);
     terrno = TSDB_CODE_TDB_OUT_OF_MEMORY;
     goto _error;
   }
 
-  code = tdInitDataCols(pTsdbReadHandle->rhelper.pDCols[1], pSchema);
+  code = tdInitDataCols(pTsdbReadHandle->rhelper.pDCols[1], pTsdbReadHandle->pSchema);
   if (code != TSDB_CODE_SUCCESS) {
     tsdbError("%p failed to malloc buf for rhelper.pDataCols[1], %s", pTsdbReadHandle, pTsdbReadHandle->idStr);
     terrno = TSDB_CODE_TDB_OUT_OF_MEMORY;
@@ -3292,6 +3296,7 @@ int32_t tsdbRetrieveDataBlockStatisInfo(tsdbReaderT* pTsdbReadHandle, SColumnDat
     if (pHandle->statis[i].numOfNull == -1) {  // set the column data are all NULL
       pHandle->statis[i].numOfNull = pBlockInfo->compBlock->numOfRows;
     }
+
   }
 
   int64_t elapsed = taosGetTimestampUs() - stime;
diff --git a/source/dnode/vnode/src/vnd/vnodeQuery.c b/source/dnode/vnode/src/vnd/vnodeQuery.c
index 0995029385..7e80eacf8f 100644
--- a/source/dnode/vnode/src/vnd/vnodeQuery.c
+++ b/source/dnode/vnode/src/vnd/vnodeQuery.c
@@ -150,11 +150,6 @@ void vnodeGetInfo(SVnode *pVnode, const char **dbname, int32_t *vgId) {
 }
 
 // wrapper of tsdb read interface
-// TODO: use FORCE_INLINE if possible later
-tsdbReaderT *tsdbQueryTables(SVnode *pVnode, SQueryTableDataCond *pCond, STableGroupInfo *tableInfoGroup, uint64_t qId,
-                             uint64_t taskId) {
-  return tsdbQueryTablesT(pVnode->pTsdb, pCond, tableInfoGroup, qId, taskId);
-}
 tsdbReaderT tsdbQueryCacheLast(SVnode *pVnode, SQueryTableDataCond *pCond, STableGroupInfo *groupList, uint64_t qId,
                                void *pMemRef) {
 #if 0
diff --git a/source/libs/command/inc/commandInt.h b/source/libs/command/inc/commandInt.h
index 452804ac91..775dee28a4 100644
--- a/source/libs/command/inc/commandInt.h
+++ b/source/libs/command/inc/commandInt.h
@@ -56,10 +56,9 @@ extern "C" {
 #define EXPLAIN_ROWS_FORMAT "rows=%" PRIu64
 #define EXPLAIN_COLUMNS_FORMAT "columns=%d"
 #define EXPLAIN_WIDTH_FORMAT "width=%d"
+#define EXPLAIN_TABLE_SCAN_FORMAT "order=[asc|%d desc|%d]"
 #define EXPLAIN_GROUPS_FORMAT "groups=%d"
 #define EXPLAIN_WIDTH_FORMAT "width=%d"
-#define EXPLAIN_LOOPS_FORMAT "loops=%d"
-#define EXPLAIN_REVERSE_FORMAT "reverse=%d"
 #define EXPLAIN_FUNCTIONS_FORMAT "functions=%d"
 #define EXPLAIN_EXECINFO_FORMAT "cost=%" PRIu64 "..%" PRIu64 " rows=%" PRIu64
 
diff --git a/source/libs/command/src/explain.c b/source/libs/command/src/explain.c
index d17a5a59a4..2aae4303eb 100644
--- a/source/libs/command/src/explain.c
+++ b/source/libs/command/src/explain.c
@@ -379,6 +379,7 @@ int32_t qExplainResNodeToRowsImpl(SExplainResNode *pResNode, SExplainCtx *ctx, i
       EXPLAIN_ROW_APPEND(EXPLAIN_BLANK_FORMAT);
       EXPLAIN_ROW_APPEND(EXPLAIN_WIDTH_FORMAT, pTblScanNode->scan.node.pOutputDataBlockDesc->totalRowSize);
       EXPLAIN_ROW_APPEND(EXPLAIN_BLANK_FORMAT);
+      EXPLAIN_ROW_APPEND(EXPLAIN_TABLE_SCAN_FORMAT, pTblScanNode->scanSeq[0], pTblScanNode->scanSeq[1]);
       EXPLAIN_ROW_APPEND(EXPLAIN_RIGHT_PARENTHESIS_FORMAT);      
       EXPLAIN_ROW_END();
       QRY_ERR_RET(qExplainResAppendRow(ctx, tbuf, tlen, level));
diff --git a/source/libs/executor/src/executorimpl.c b/source/libs/executor/src/executorimpl.c
index 9ff02369c5..11d770a22d 100644
--- a/source/libs/executor/src/executorimpl.c
+++ b/source/libs/executor/src/executorimpl.c
@@ -6924,7 +6924,7 @@ tsdbReaderT doCreateDataReader(STableScanPhysiNode* pTableScanNode, SReadHandle*
   code = initQueryTableDataCond(&cond, pTableScanNode);
   if (code != TSDB_CODE_SUCCESS) {
     goto _error;
-  }
+   }
 #if 0
   return tsdbQueryTables(pHandle->reader, &cond, pTableGroupInfo, queryId, taskId);
 #endif
diff --git a/source/libs/parser/src/parCalcConst.c b/source/libs/parser/src/parCalcConst.c
index 0aa4a3e6cb..9c2bd10686 100644
--- a/source/libs/parser/src/parCalcConst.c
+++ b/source/libs/parser/src/parCalcConst.c
@@ -240,7 +240,7 @@ static int32_t calcConstSelect(SCalcConstContext* pCxt, SSelectStmt* pSelect, bo
     code = calcConstNode(&pSelect->pWindow);
   }
   if (TSDB_CODE_SUCCESS == code) {
-    code = calcConstList(pSelect->pGroupByList);
+    code = calcConstGroupBy(pCxt, pSelect);
   }
   if (TSDB_CODE_SUCCESS == code) {
     code = calcConstSelectCondition(pCxt, pSelect, &pSelect->pHaving);