diff --git a/source/libs/executor/inc/executorimpl.h b/source/libs/executor/inc/executorimpl.h
index 80f956d3dd5dbc29bccc0207dc48d7c261d13b4f..34b7fce33cbccc11a6699636f160d44bd0ee4665 100644
--- a/source/libs/executor/inc/executorimpl.h
+++ b/source/libs/executor/inc/executorimpl.h
@@ -658,6 +658,7 @@ void    initExecTimeWindowInfo(SColumnInfoData* pColData, STimeWindow* pQueryWin
 void    cleanupAggSup(SAggSupporter* pAggSup);
 void    destroyBasicOperatorInfo(void* param, int32_t numOfOutput);
 void    appendOneRowToDataBlock(SSDataBlock* pBlock, STupleHandle* pTupleHandle);
+SInterval extractIntervalInfo(const STableScanPhysiNode* pTableScanNode);
 
 SSDataBlock* getSortedBlockData(SSortHandle* pHandle, SSDataBlock* pDataBlock, int32_t capacity, SArray* pColMatchInfo);
 SSDataBlock* loadNextDataBlock(void* param);
diff --git a/source/libs/executor/src/executorimpl.c b/source/libs/executor/src/executorimpl.c
index 593089f28abcd033b175273df88b31d3611cd9f5..fe5066a06585ec76fcb27cd221436224c23a12ce 100644
--- a/source/libs/executor/src/executorimpl.c
+++ b/source/libs/executor/src/executorimpl.c
@@ -4603,7 +4603,7 @@ static SResSchema createResSchema(int32_t type, int32_t bytes, int32_t slotId, i
   return s;
 }
 
-static SColumn* createColumn(int32_t blockId, int32_t slotId, SDataType* pType) {
+static SColumn* createColumn(int32_t blockId, int32_t slotId, int32_t colId, SDataType* pType) {
   SColumn* pCol = taosMemoryCalloc(1, sizeof(SColumn));
   if (pCol == NULL) {
     terrno = TSDB_CODE_OUT_OF_MEMORY;
@@ -4611,9 +4611,10 @@ static SColumn* createColumn(int32_t blockId, int32_t slotId, SDataType* pType)
   }
 
   pCol->slotId = slotId;
-  pCol->bytes = pType->bytes;
-  pCol->type = pType->type;
-  pCol->scale = pType->scale;
+  pCol->colId  = colId;
+  pCol->bytes  = pType->bytes;
+  pCol->type   = pType->type;
+  pCol->scale  = pType->scale;
   pCol->precision = pType->precision;
   pCol->dataBlockId = blockId;
 
@@ -4656,7 +4657,7 @@ SExprInfo* createExprInfo(SNodeList* pNodeList, SNodeList* pGroupKeys, int32_t*
       SDataType* pType = &pColNode->node.resType;
       pExp->base.resSchema = createResSchema(pType->type, pType->bytes, pTargetNode->slotId, pType->scale,
                                              pType->precision, pColNode->colName);
-      pExp->base.pParam[0].pCol = createColumn(pColNode->dataBlockId, pColNode->slotId, pType);
+      pExp->base.pParam[0].pCol = createColumn(pColNode->dataBlockId, pColNode->slotId, pColNode->colId, pType);
       pExp->base.pParam[0].type = FUNC_PARAM_TYPE_COLUMN;
     } else if (type == QUERY_NODE_VALUE) {
       pExp->pExpr->nodeType = QUERY_NODE_VALUE;
@@ -4708,7 +4709,7 @@ SExprInfo* createExprInfo(SNodeList* pNodeList, SNodeList* pGroupKeys, int32_t*
           SColumnNode* pcn = (SColumnNode*)p1;
 
           pExp->base.pParam[j].type = FUNC_PARAM_TYPE_COLUMN;
-          pExp->base.pParam[j].pCol = createColumn(pcn->dataBlockId, pcn->slotId, &pcn->node.resType);
+          pExp->base.pParam[j].pCol = createColumn(pcn->dataBlockId, pcn->slotId, pcn->colId, &pcn->node.resType);
         } else if (p1->type == QUERY_NODE_VALUE) {
           SValueNode* pvn = (SValueNode*)p1;
           pExp->base.pParam[j].type = FUNC_PARAM_TYPE_VALUE;
@@ -4788,7 +4789,7 @@ SOperatorInfo* createOperatorTree(SPhysiNode* pPhyNode, SExecTaskInfo* pTaskInfo
       SScanPhysiNode* pScanPhyNode = (SScanPhysiNode*)pPhyNode;  // simple child table.
       STableScanPhysiNode* pTableScanNode = (STableScanPhysiNode*)pPhyNode;
 
-      int32_t     numOfCols = 0;
+      int32_t numOfCols = 0;
 
       tsdbReaderT pDataReader = NULL;
       if (pHandle->vnode) {
@@ -4797,6 +4798,7 @@ SOperatorInfo* createOperatorTree(SPhysiNode* pPhyNode, SExecTaskInfo* pTaskInfo
         doCreateTableGroup(pHandle->meta, pScanPhyNode->tableType, pScanPhyNode->uid, pTableGroupInfo, 
             queryId, taskId);
       }
+
       if (pDataReader == NULL && terrno != 0) {
         qDebug("pDataReader is     NULL");
         // return NULL;
@@ -4816,12 +4818,8 @@ SOperatorInfo* createOperatorTree(SPhysiNode* pPhyNode, SExecTaskInfo* pTaskInfo
       }
 
       SInterval      interval = extractIntervalInfo(pTableScanNode);
-      SOperatorInfo* pOperatorDumy = createTableScanOperatorInfo(
-          pDataReader, &cond, numOfCols, pTableScanNode->dataRequired, pTableScanNode->scanSeq, pColList,
-          pResBlockDumy, pScanPhyNode->node.pConditions, &interval, pTableScanNode->ratio, pTaskInfo);
+      SOperatorInfo* pOperatorDumy = createTableScanOperatorInfo(pTableScanNode, pDataReader, pHandle, pTaskInfo);
 
-      // int32_t code = doCreateTableGroup(pHandle->meta, pScanPhyNode->tableType, pScanPhyNode->uid, pTableGroupInfo,
-      //                                   queryId, taskId);
       SArray* tableIdList = extractTableIdList(pTableGroupInfo);
       SSDataBlock*        pResBlock = createResDataBlock(pDescNode);
 
diff --git a/source/libs/executor/src/scanoperator.c b/source/libs/executor/src/scanoperator.c
index 96e5d7d1f2166438c315aa82c275116ef992a44c..1483b6b042e44c858bb01a4d3f8d636f776cd474 100644
--- a/source/libs/executor/src/scanoperator.c
+++ b/source/libs/executor/src/scanoperator.c
@@ -13,8 +13,8 @@
  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include "filter.h"
 #include "function.h"
+#include "filter.h"
 #include "functionMgt.h"
 #include "os.h"
 #include "querynodes.h"
@@ -1408,35 +1408,33 @@ static SSDataBlock* doTagScan(SOperatorInfo* pOperator) {
   char        str[512] = {0};
   int32_t     count = 0;
   SMetaReader mr = {0};
+  metaReaderInit(&mr, pInfo->readHandle.meta, 0);
 
   while (pInfo->curPos < pInfo->pTableGroups->numOfTables && count < pOperator->resultInfo.capacity) {
     STableKeyInfo* item = taosArrayGet(pa, pInfo->curPos);
+    metaGetTableEntryByUid(&mr, item->uid);
 
     for (int32_t j = 0; j < pOperator->numOfExprs; ++j) {
       SColumnInfoData* pDst = taosArrayGet(pRes->pDataBlock, pExprInfo[j].base.resSchema.slotId);
 
       // refactor later
       if (fmIsScanPseudoColumnFunc(pExprInfo[j].pExpr->_function.functionId)) {
-        metaReaderInit(&mr, pInfo->readHandle.meta, 0);
-        metaGetTableEntryByUid(&mr, item->uid);
-
         STR_TO_VARSTR(str, mr.me.name);
-        metaReaderClear(&mr);
-
         colDataAppend(pDst, count, str, false);
-        //        data = tsdbGetTableTagVal(item->pTable, pExprInfo[j].base.pColumns->info.colId, type, bytes);
-        //        dst  = pColInfo->pData + count * pExprInfo[j].base.resSchema.bytes;
-        //        doSetTagValueToResultBuf(dst, data, type, bytes);
+      } else { // it is a tag value
+        const char* p = metaGetTableTagVal(&mr.me, pExprInfo[j].base.pParam[0].pCol->colId);
+        colDataAppend(pDst, count, p, (p == NULL));
       }
-
-      count += 1;
     }
 
+    count += 1;
     if (++pInfo->curPos >= pInfo->pTableGroups->numOfTables) {
       pOperator->status = OP_EXEC_DONE;
     }
   }
 
+  metaReaderClear(&mr);
+
   // qDebug("QInfo:0x%"PRIx64" create tag values results completed, rows:%d", GET_TASKID(pRuntimeEnv), count);
   if (pOperator->status == OP_EXEC_DONE) {
     setTaskStatus(pTaskInfo, TASK_COMPLETED);
diff --git a/source/libs/function/test/udf2.c b/source/libs/function/test/udf2.c
index b3b60f93a4f418acfcd78ed8819342ee4df1d93a..ba39b09f56302964923cdfc5d073936bf46da3ee 100644
--- a/source/libs/function/test/udf2.c
+++ b/source/libs/function/test/udf2.c
@@ -19,17 +19,18 @@ int32_t udf2_destroy() {
 
 int32_t udf2_start(SUdfInterBuf *buf) {
   *(int64_t*)(buf->buf) = 0;
-  buf->bufLen = sizeof(int64_t);
+  buf->bufLen = sizeof(double);
   buf->numOfResult = 0;
   return 0;
 }
 
 int32_t udf2(SUdfDataBlock* block, SUdfInterBuf *interBuf, SUdfInterBuf *newInterBuf) {
-  int64_t sumSquares = *(int64_t*)interBuf->buf;
+  double sumSquares = *(double*)interBuf->buf;
   int8_t numOutput = 0;
   for (int32_t i = 0; i < block->numOfCols; ++i) {
     SUdfColumn* col = block->udfCols[i];
-    if (col->colMeta.type != TSDB_DATA_TYPE_INT) {
+    if (!(col->colMeta.type == TSDB_DATA_TYPE_INT || 
+          col->colMeta.type == TSDB_DATA_TYPE_DOUBLE)) {
       return TSDB_CODE_UDF_INVALID_INPUT;
     }
   }
@@ -39,17 +40,29 @@ int32_t udf2(SUdfDataBlock* block, SUdfInterBuf *interBuf, SUdfInterBuf *newInte
       if (udfColDataIsNull(col, j)) {
         continue;
       }
-
-      char* cell = udfColDataGetData(col, j);
-      int32_t num = *(int32_t*)cell;
-      sumSquares += num * num;
+      switch (col->colMeta.type) {
+        case TSDB_DATA_TYPE_INT: {
+          char* cell = udfColDataGetData(col, j);
+          int32_t num = *(int32_t*)cell;
+          sumSquares += num * num;
+          break;
+        }
+        case TSDB_DATA_TYPE_DOUBLE: {
+          char* cell = udfColDataGetData(col, j);
+          double num = *(double*)cell;
+          sumSquares += num * num;
+          break;
+        }
+        default: 
+          break;
+      }
       numOutput = 1;
     }
   }
 
   if (numOutput == 1) {
-    *(int64_t*)(newInterBuf->buf) = sumSquares;
-    newInterBuf->bufLen = sizeof(int64_t);
+    *(double*)(newInterBuf->buf) = sumSquares;
+    newInterBuf->bufLen = sizeof(double);
   }
   newInterBuf->numOfResult = numOutput;
   return 0;
@@ -60,7 +73,7 @@ int32_t udf2_finish(SUdfInterBuf* buf, SUdfInterBuf *resultData) {
     resultData->numOfResult = 0;
     return 0;
   }
-  int64_t sumSquares = *(int64_t*)(buf->buf);
+  double sumSquares = *(double*)(buf->buf);
   *(double*)(resultData->buf) = sqrt(sumSquares);
   resultData->bufLen = sizeof(double);
   resultData->numOfResult = 1;
diff --git a/tests/script/tsim/query/udf.sim b/tests/script/tsim/query/udf.sim
index 62904032148da25d6aa1e71cc281c4306832ec88..19e133e9496ea6161656d830432049eebe407e8c 100644
--- a/tests/script/tsim/query/udf.sim
+++ b/tests/script/tsim/query/udf.sim
@@ -3,7 +3,7 @@ system sh/stop_dnodes.sh
 system sh/deploy.sh -n dnode1 -i 1
 system sh/cfg.sh -n dnode1 -c wallevel -v 2
 system sh/cfg.sh -n dnode1 -c numOfMnodes -v 1
-system sh/cfg.sh -n dnode1 -c startUdfd -v 1
+system sh/cfg.sh -n dnode1 -c udf -v 1
 
 print ========= start dnode1 as LEADER
 system sh/exec.sh -n dnode1 -s start