diff --git a/include/common/tcommon.h b/include/common/tcommon.h
index d8264ac5b50a0eee45454231538df06a96cf2207..005a4e9f573cd420dab01dfd8ba4088fd2403a87 100644
--- a/include/common/tcommon.h
+++ b/include/common/tcommon.h
@@ -162,7 +162,6 @@ typedef struct SQueryTableDataCond {
   int64_t      endVersion;
 } SQueryTableDataCond;
 
-void*   blockDataDestroy(SSDataBlock* pBlock);
 int32_t tEncodeDataBlock(void** buf, const SSDataBlock* pBlock);
 void*   tDecodeDataBlock(const void* buf, SSDataBlock* pBlock);
 
@@ -170,19 +169,6 @@ int32_t tEncodeDataBlocks(void** buf, const SArray* blocks);
 void*   tDecodeDataBlocks(const void* buf, SArray** blocks);
 void    colDataDestroy(SColumnInfoData* pColData);
 
-static FORCE_INLINE void blockDestroyInner(SSDataBlock* pBlock) {
-  int32_t numOfOutput = taosArrayGetSize(pBlock->pDataBlock);
-  for (int32_t i = 0; i < numOfOutput; ++i) {
-    SColumnInfoData* pColInfoData = (SColumnInfoData*)taosArrayGet(pBlock->pDataBlock, i);
-    colDataDestroy(pColInfoData);
-  }
-
-  taosArrayDestroy(pBlock->pDataBlock);
-  taosMemoryFreeClear(pBlock->pBlockAgg);
-}
-
-static FORCE_INLINE void tDeleteSSDataBlock(SSDataBlock* pBlock) { blockDestroyInner(pBlock); }
-
 //======================================================================================================================
 // the following structure shared by parser and executor
 typedef struct SColumn {
diff --git a/include/common/tdatablock.h b/include/common/tdatablock.h
index af333f72aad03a882a336a6a41df0c11b3211507..a4f59040184221db85ac41a68e3e62f9e21398e9 100644
--- a/include/common/tdatablock.h
+++ b/include/common/tdatablock.h
@@ -226,8 +226,12 @@ int32_t blockDataKeepFirstNRows(SSDataBlock* pBlock, size_t n);
 
 int32_t      assignOneDataBlock(SSDataBlock* dst, const SSDataBlock* src);
 int32_t      copyDataBlock(SSDataBlock* dst, const SSDataBlock* src);
-SSDataBlock* createOneDataBlock(const SSDataBlock* pDataBlock, bool copyData);
+
 SSDataBlock* createDataBlock();
+void*        blockDataDestroy(SSDataBlock* pBlock);
+void         blockDataFreeRes(SSDataBlock* pBlock);
+SSDataBlock* createOneDataBlock(const SSDataBlock* pDataBlock, bool copyData);
+
 int32_t      blockDataAppendColInfo(SSDataBlock* pBlock, SColumnInfoData* pColInfoData);
 
 SColumnInfoData  createColumnInfoData(int16_t type, int32_t bytes, int16_t colId);
diff --git a/include/libs/stream/tstream.h b/include/libs/stream/tstream.h
index a08db7b8f899b302cd2a58dc857fbd0dc84f53d1..071c539ff32c3a47b996c0b3a15a168fe0e87490 100644
--- a/include/libs/stream/tstream.h
+++ b/include/libs/stream/tstream.h
@@ -340,12 +340,12 @@ static FORCE_INLINE int32_t streamTaskOutput(SStreamTask* pTask, SStreamDataBloc
   if (pTask->sinkType == TASK_SINK__TABLE) {
     ASSERT(pTask->dispatchType == TASK_DISPATCH__NONE);
     pTask->tbSink.tbSinkFunc(pTask, pTask->tbSink.vnode, 0, pBlock->blocks);
-    taosArrayDestroyEx(pBlock->blocks, (FDelete)tDeleteSSDataBlock);
+    taosArrayDestroyEx(pBlock->blocks, (FDelete)blockDataFreeRes);
     taosFreeQitem(pBlock);
   } else if (pTask->sinkType == TASK_SINK__SMA) {
     ASSERT(pTask->dispatchType == TASK_DISPATCH__NONE);
     pTask->smaSink.smaSink(pTask->smaSink.vnode, pTask->smaSink.smaId, pBlock->blocks);
-    taosArrayDestroyEx(pBlock->blocks, (FDelete)tDeleteSSDataBlock);
+    taosArrayDestroyEx(pBlock->blocks, (FDelete)blockDataFreeRes);
     taosFreeQitem(pBlock);
   } else {
     ASSERT(pTask->dispatchType != TASK_DISPATCH__NONE);
diff --git a/source/common/src/tdatablock.c b/source/common/src/tdatablock.c
index 9f5a247d76e1ae26668597602eec8391cb0ad6bd..47cfa5d4106c5368105abe18d2970a05203e4d8d 100644
--- a/source/common/src/tdatablock.c
+++ b/source/common/src/tdatablock.c
@@ -1197,15 +1197,28 @@ int32_t blockDataEnsureCapacity(SSDataBlock* pDataBlock, uint32_t numOfRows) {
   return TSDB_CODE_SUCCESS;
 }
 
+void blockDataFreeRes(SSDataBlock* pBlock) {
+  int32_t numOfOutput = taosArrayGetSize(pBlock->pDataBlock);
+  for (int32_t i = 0; i < numOfOutput; ++i) {
+    SColumnInfoData* pColInfoData = (SColumnInfoData*)taosArrayGet(pBlock->pDataBlock, i);
+    colDataDestroy(pColInfoData);
+  }
+
+  taosArrayDestroy(pBlock->pDataBlock);
+  taosMemoryFreeClear(pBlock->pBlockAgg);
+  memset(&pBlock->info, 0, sizeof(SDataBlockInfo));
+}
+
 void* blockDataDestroy(SSDataBlock* pBlock) {
   if (pBlock == NULL) {
     return NULL;
   }
 
-  blockDestroyInner(pBlock);
+  blockDataFreeRes(pBlock);
   taosMemoryFreeClear(pBlock);
   return NULL;
 }
+
 int32_t assignOneDataBlock(SSDataBlock* dst, const SSDataBlock* src) {
   ASSERT(src != NULL);
 
diff --git a/source/dnode/vnode/src/tq/tqRead.c b/source/dnode/vnode/src/tq/tqRead.c
index 8753ecc47c04f1d5d4e151c502436225cc49e806..a7ad935caa12c5ee794784c48bfc09bcd3a59dbc 100644
--- a/source/dnode/vnode/src/tq/tqRead.c
+++ b/source/dnode/vnode/src/tq/tqRead.c
@@ -319,7 +319,7 @@ int32_t tqRetrieveDataBlock(SSDataBlock* pBlock, STqReader* pReader) {
   return 0;
 
 FAIL:
-  tDeleteSSDataBlock(pBlock);
+  blockDataFreeRes(pBlock);
   return -1;
 }
 
diff --git a/source/dnode/vnode/src/tsdb/tsdbRead.c b/source/dnode/vnode/src/tsdb/tsdbRead.c
index 4aaa80d3aead8f95d75e02730ca179fabe888f1a..5e30fcd5b2efbae26232e5340cf00f1617ad90c1 100644
--- a/source/dnode/vnode/src/tsdb/tsdbRead.c
+++ b/source/dnode/vnode/src/tsdb/tsdbRead.c
@@ -209,10 +209,10 @@ static void resetDataBlockScanInfo(SHashObj* pTableMap) {
     p->iterInit = false;
     p->iiter.hasVal = false;
     if (p->iter.iter != NULL) {
-      tsdbTbDataIterDestroy(p->iter.iter);
+      p->iter.iter = tsdbTbDataIterDestroy(p->iter.iter);
     }
 
-    taosArrayDestroy(p->delSkyline);
+    p->delSkyline = taosArrayDestroy(p->delSkyline);
   }
 }
 
@@ -224,18 +224,15 @@ static void destroyBlockScanInfo(SHashObj* pTableMap) {
     p->iiter.hasVal = false;
 
     if (p->iter.iter != NULL) {
-      tsdbTbDataIterDestroy(p->iter.iter);
-      p->iter.iter = NULL;
+      p->iter.iter = tsdbTbDataIterDestroy(p->iter.iter);
     }
 
     if (p->iiter.iter != NULL) {
-      tsdbTbDataIterDestroy(p->iiter.iter);
-      p->iiter.iter = NULL;
+      p->iiter.iter = tsdbTbDataIterDestroy(p->iiter.iter);
     }
 
-    taosArrayDestroy(p->delSkyline);
-    taosArrayDestroy(p->pBlockList);
-    p->delSkyline = NULL;
+    p->delSkyline = taosArrayDestroy(p->delSkyline);
+    p->pBlockList = taosArrayDestroy(p->pBlockList);
   }
 
   taosHashCleanup(pTableMap);
diff --git a/source/libs/executor/src/scanoperator.c b/source/libs/executor/src/scanoperator.c
index 701002d0e793dd33a87ca8e4a647712df9a992bf..1d309931d6b7ddf0a78a3f7ab58b4e1f826606dd 100644
--- a/source/libs/executor/src/scanoperator.c
+++ b/source/libs/executor/src/scanoperator.c
@@ -1193,8 +1193,6 @@ static int32_t setBlockIntoRes(SStreamScanInfo* pInfo, const SSDataBlock* pBlock
     }
   }
 
-  taosArrayDestroy(pBlock->pDataBlock);
-
   ASSERT(pInfo->pRes->pDataBlock != NULL);
 
   // currently only the tbname pseudo column
@@ -1202,12 +1200,14 @@ static int32_t setBlockIntoRes(SStreamScanInfo* pInfo, const SSDataBlock* pBlock
     int32_t code = addTagPseudoColumnData(&pInfo->readHandle, pInfo->pPseudoExpr, pInfo->numOfPseudoExpr, pInfo->pRes,
                                           GET_TASKID(pTaskInfo));
     if (code != TSDB_CODE_SUCCESS) {
+      blockDataFreeRes((SSDataBlock*) pBlock);
       longjmp(pTaskInfo->env, code);
     }
   }
 
   doFilter(pInfo->pCondition, pInfo->pRes);
   blockDataUpdateTsWindow(pInfo->pRes, pInfo->primaryTsIndex);
+  blockDataFreeRes((SSDataBlock*) pBlock);
   return 0;
 }
 
diff --git a/source/libs/executor/src/tfill.c b/source/libs/executor/src/tfill.c
index 959c03a3b1464dc7e6f6fb42ba098d3e7e2b609b..e0bdcfdc3a6a744c9f67e1d466e05be8bd30c4f5 100644
--- a/source/libs/executor/src/tfill.c
+++ b/source/libs/executor/src/tfill.c
@@ -71,13 +71,8 @@ static void doFillOneRow(SFillInfo* pFillInfo, SSDataBlock* pBlock, SSDataBlock*
   SPoint  point1, point2, point;
   int32_t step = GET_FORWARD_DIRECTION_FACTOR(pFillInfo->order);
 
-  // set the primary timestamp column value
-  int32_t          index = pFillInfo->numOfCurrent;
-  SColumnInfoData* pCol0 = taosArrayGet(pBlock->pDataBlock, pFillInfo->tsSlotId);
-  char*            val = colDataGetData(pCol0, index);
-
-  // set the primary timestamp value
-  *(TSKEY*)val = pFillInfo->currentKey;
+//   set the primary timestamp column value
+  int32_t index = pFillInfo->numOfCurrent;
 
   // set the other values
   if (pFillInfo->type == TSDB_FILL_PREV) {
@@ -92,7 +87,7 @@ static void doFillOneRow(SFillInfo* pFillInfo, SSDataBlock* pBlock, SSDataBlock*
       SColumnInfoData* pDstColInfoData = taosArrayGet(pBlock->pDataBlock, GET_DEST_SLOT_ID(pCol));
 
       if (pDstColInfoData->info.type == TSDB_DATA_TYPE_TIMESTAMP) {
-        colDataAppend(pDstColInfoData, index, (const char*)&ts, false);
+        colDataAppend(pDstColInfoData, index, (const char*)&pFillInfo->currentKey, false);
       } else {
         SGroupKeys* pKey = taosArrayGet(p, i);
         doSetVal(pDstColInfoData, index, pKey);
@@ -101,41 +96,51 @@ static void doFillOneRow(SFillInfo* pFillInfo, SSDataBlock* pBlock, SSDataBlock*
   } else if (pFillInfo->type == TSDB_FILL_NEXT) {
     SArray* p = FILL_IS_ASC_FILL(pFillInfo) ? pFillInfo->next : pFillInfo->prev;
     // todo  refactor: start from 0 not 1
-    for (int32_t i = 1; i < pFillInfo->numOfCols; ++i) {
+    for (int32_t i = 0; i < pFillInfo->numOfCols; ++i) {
       SFillColInfo* pCol = &pFillInfo->pFillCol[i];
       if (TSDB_COL_IS_TAG(pCol->flag)) {
         continue;
       }
 
-      SGroupKeys*      pKey = taosArrayGet(p, i);
       SColumnInfoData* pDstColInfoData = taosArrayGet(pBlock->pDataBlock, GET_DEST_SLOT_ID(pCol));
-      doSetVal(pDstColInfoData, index, pKey);
+
+      if (pDstColInfoData->info.type == TSDB_DATA_TYPE_TIMESTAMP) {
+        colDataAppend(pDstColInfoData, index, (const char*)&pFillInfo->currentKey, false);
+      } else {
+        SGroupKeys* pKey = taosArrayGet(p, i);
+        doSetVal(pDstColInfoData, index, pKey);
+      }
     }
   } else if (pFillInfo->type == TSDB_FILL_LINEAR) {
     // TODO : linear interpolation supports NULL value
     if (outOfBound) {
       setNullRow(pBlock, pFillInfo->currentKey, index);
     } else {
-      for (int32_t i = 1; i < pFillInfo->numOfCols; ++i) {
+      for (int32_t i = 0; i < pFillInfo->numOfCols; ++i) {
         SFillColInfo* pCol = &pFillInfo->pFillCol[i];
         if (TSDB_COL_IS_TAG(pCol->flag)) {
           continue;
         }
 
-        int32_t srcSlotId = GET_SRC_SLOT_ID(pCol);
-
         int32_t          dstSlotId = GET_DEST_SLOT_ID(pCol);
         SColumnInfoData* pDstCol = taosArrayGet(pBlock->pDataBlock, dstSlotId);
 
-        int16_t     type = pCol->pExpr->base.resSchema.type;
+        int16_t type = pDstCol->info.type;
+        if (type == TSDB_DATA_TYPE_TIMESTAMP) {
+          colDataAppend(pDstCol, index, (const char*)&pFillInfo->currentKey, false);
+          continue;
+        }
+
         SGroupKeys* pKey = taosArrayGet(pFillInfo->prev, i);
         if (IS_VAR_DATA_TYPE(type) || type == TSDB_DATA_TYPE_BOOL || pKey->isNull) {
           colDataAppendNULL(pDstCol, index);
           continue;
         }
 
-        SGroupKeys* pKey1 = taosArrayGet(pFillInfo->prev, 0);
-        int64_t     prevTs = *(int64_t*)pKey1->pData;
+        SGroupKeys* pKey1 = taosArrayGet(pFillInfo->prev, pFillInfo->tsSlotId);
+
+        int64_t prevTs = *(int64_t*)pKey1->pData;
+        int32_t srcSlotId = GET_SRC_SLOT_ID(pCol);
 
         SColumnInfoData* pSrcCol = taosArrayGet(pSrcBlock->pDataBlock, srcSlotId);
         char*            data = colDataGetData(pSrcCol, pFillInfo->index);
@@ -153,7 +158,7 @@ static void doFillOneRow(SFillInfo* pFillInfo, SSDataBlock* pBlock, SSDataBlock*
   } else if (pFillInfo->type == TSDB_FILL_NULL) {  // fill with NULL
     setNullRow(pBlock, pFillInfo->currentKey, index);
   } else {  // fill with user specified value for each column
-    for (int32_t i = 1; i < pFillInfo->numOfCols; ++i) {
+    for (int32_t i = 0; i < pFillInfo->numOfCols; ++i) {
       SFillColInfo* pCol = &pFillInfo->pFillCol[i];
       if (TSDB_COL_IS_TAG(pCol->flag) /* || IS_VAR_DATA_TYPE(pCol->schema.type)*/) {
         continue;
@@ -176,6 +181,8 @@ static void doFillOneRow(SFillInfo* pFillInfo, SSDataBlock* pBlock, SSDataBlock*
         colDataAppend(pDst, index, (char*)&v, false);
       } else if (pDst->info.type == TSDB_DATA_TYPE_TIMESTAMP) {
         colDataAppend(pDst, index, (const char*)&pFillInfo->currentKey, false);
+      } else {  // varchar/nchar data
+        colDataAppendNULL(pDst, index);
       }
     }
   }
@@ -234,8 +241,7 @@ static void copyCurrentRowIntoBuf(SFillInfo* pFillInfo, int32_t rowIndex, SArray
 static int32_t fillResultImpl(SFillInfo* pFillInfo, SSDataBlock* pBlock, int32_t outputRows) {
   pFillInfo->numOfCurrent = 0;
 
-  // todo make sure the first column is always the primary timestamp column?
-  SColumnInfoData* pTsCol = taosArrayGet(pFillInfo->pSrcBlock->pDataBlock, 0);
+  SColumnInfoData* pTsCol = taosArrayGet(pFillInfo->pSrcBlock->pDataBlock, pFillInfo->tsSlotId);
 
   int32_t step = GET_FORWARD_DIRECTION_FACTOR(pFillInfo->order);
   bool    ascFill = FILL_IS_ASC_FILL(pFillInfo);
diff --git a/source/libs/function/src/udfd.c b/source/libs/function/src/udfd.c
index a412b589a9eb1163c80bb0677838b4d39070e25f..fd9b588d46d182742cfd7b8568257d375ee42942 100644
--- a/source/libs/function/src/udfd.c
+++ b/source/libs/function/src/udfd.c
@@ -296,8 +296,8 @@ void udfdProcessCallRequest(SUvUdfWork *uvUdf, SUdfRequest *request) {
 
   switch (call->callType) {
     case TSDB_UDF_CALL_SCALA_PROC: {
-      tDeleteSSDataBlock(&call->block);
-      tDeleteSSDataBlock(&subRsp->resultData);
+      blockDataFreeRes(&call->block);
+      blockDataFreeRes(&subRsp->resultData);
       break;
     }
     case TSDB_UDF_CALL_AGG_INIT: {
@@ -305,7 +305,7 @@ void udfdProcessCallRequest(SUvUdfWork *uvUdf, SUdfRequest *request) {
       break;
     }
     case TSDB_UDF_CALL_AGG_PROC: {
-      tDeleteSSDataBlock(&call->block);
+      blockDataFreeRes(&call->block);
       freeUdfInterBuf(&subRsp->resultBuf);
       break;
     }
diff --git a/source/libs/stream/src/streamData.c b/source/libs/stream/src/streamData.c
index 2b3307b7f5e65e8d2765252415f504dd62049829..8e16b23e56e9506c1110afcbee0dfb251c7e4cc8 100644
--- a/source/libs/stream/src/streamData.c
+++ b/source/libs/stream/src/streamData.c
@@ -116,7 +116,7 @@ void streamFreeQitem(SStreamQueueItem* data) {
     blockDataDestroy(((SStreamTrigger*)data)->pBlock);
     taosFreeQitem(data);
   } else if (type == STREAM_INPUT__DATA_BLOCK || type == STREAM_INPUT__DATA_RETRIEVE) {
-    taosArrayDestroyEx(((SStreamDataBlock*)data)->blocks, (FDelete)tDeleteSSDataBlock);
+    taosArrayDestroyEx(((SStreamDataBlock*)data)->blocks, (FDelete)blockDataFreeRes);
     taosFreeQitem(data);
   } else if (type == STREAM_INPUT__DATA_SUBMIT) {
     streamDataSubmitRefDec((SStreamDataSubmit*)data);
diff --git a/source/libs/stream/src/streamDispatch.c b/source/libs/stream/src/streamDispatch.c
index 05efce8bc264a38c79269e2190fb240e602c3540..e2faf28abe2e0e6fa2e61abe7fbd9b1f00a8ff9e 100644
--- a/source/libs/stream/src/streamDispatch.c
+++ b/source/libs/stream/src/streamDispatch.c
@@ -313,7 +313,7 @@ int32_t streamDispatch(SStreamTask* pTask, SMsgCb* pMsgCb) {
     atomic_store_8(&pTask->outputStatus, TASK_OUTPUT_STATUS__NORMAL);
     return -1;
   }
-  taosArrayDestroyEx(pBlock->blocks, (FDelete)tDeleteSSDataBlock);
+  taosArrayDestroyEx(pBlock->blocks, (FDelete)blockDataFreeRes);
   taosFreeQitem(pBlock);
 
   tmsgSendReq(pEpSet, &dispatchMsg);
diff --git a/source/libs/stream/src/streamExec.c b/source/libs/stream/src/streamExec.c
index d0d81e3343af3e6933986e376bbd1a66cdc0fb73..023c092028bf4ec22196844bb3d42c2c7ad45409 100644
--- a/source/libs/stream/src/streamExec.c
+++ b/source/libs/stream/src/streamExec.c
@@ -106,7 +106,7 @@ static SArray* streamExecForQall(SStreamTask* pTask, SArray* pRes) {
     qDebug("stream task %d exec end", pTask->taskId);
 
     if (pTask->taskStatus == TASK_STATUS__DROPPING) {
-      taosArrayDestroyEx(pRes, (FDelete)tDeleteSSDataBlock);
+      taosArrayDestroyEx(pRes, (FDelete)blockDataFreeRes);
       return NULL;
     }
 
@@ -121,7 +121,7 @@ static SArray* streamExecForQall(SStreamTask* pTask, SArray* pRes) {
       qRes->blocks = pRes;
       if (streamTaskOutput(pTask, qRes) < 0) {
         /*streamQueueProcessFail(pTask->inputQueue);*/
-        taosArrayDestroyEx(pRes, (FDelete)tDeleteSSDataBlock);
+        taosArrayDestroyEx(pRes, (FDelete)blockDataFreeRes);
         taosFreeQitem(qRes);
         return NULL;
       }
@@ -155,7 +155,7 @@ int32_t streamExec(SStreamTask* pTask, SMsgCb* pMsgCb) {
       pRes = streamExecForQall(pTask, pRes);
       if (pRes == NULL) goto FAIL;
 
-      taosArrayDestroyEx(pRes, (FDelete)tDeleteSSDataBlock);
+      taosArrayDestroyEx(pRes, (FDelete)blockDataFreeRes);
       atomic_store_8(&pTask->execStatus, TASK_EXEC_STATUS__IDLE);
       qDebug("stream exec, return result");
       return 0;
@@ -163,7 +163,7 @@ int32_t streamExec(SStreamTask* pTask, SMsgCb* pMsgCb) {
       continue;
     } else if (execStatus == TASK_EXEC_STATUS__EXECUTING) {
       ASSERT(taosArrayGetSize(pRes) == 0);
-      taosArrayDestroyEx(pRes, (FDelete)tDeleteSSDataBlock);
+      taosArrayDestroyEx(pRes, (FDelete)blockDataFreeRes);
       return 0;
     } else {
       ASSERT(0);