diff --git a/include/common/tmsg.h b/include/common/tmsg.h
index df76edffc974690057011fd5f32eb39a8e6d442f..dc997221e81d519eb5e0b292c925e546fa8d989f 100644
--- a/include/common/tmsg.h
+++ b/include/common/tmsg.h
@@ -3424,7 +3424,7 @@ typedef struct {
 int32_t tEncodeSSubmitReq2(SEncoder* pCoder, const SSubmitReq2* pReq);
 int32_t tDecodeSSubmitReq2(SDecoder* pCoder, SSubmitReq2* pReq);
 void    tDestroySSubmitTbData(SSubmitTbData* pTbData, int32_t flag);
-void    tDestroySSubmitReq2(SSubmitReq2* pReq, int32_t flag);
+void    tDestroySSubmitReq(SSubmitReq2* pReq, int32_t flag);
 
 typedef struct {
   int32_t affectedRows;
diff --git a/source/common/src/tdatablock.c b/source/common/src/tdatablock.c
index f4d2ed01b079b11ff00c7d021a918f5dbe543240..3558feaa662b18728e50a8755fe25b469d65e4f5 100644
--- a/source/common/src/tdatablock.c
+++ b/source/common/src/tdatablock.c
@@ -2388,7 +2388,7 @@ _end:
   if (terrno != 0) {
     *ppReq = NULL;
     if (pReq) {
-      tDestroySSubmitReq2(pReq, TSDB_MSG_FLG_ENCODE);
+      tDestroySSubmitReq(pReq, TSDB_MSG_FLG_ENCODE);
       taosMemoryFreeClear(pReq);
     }
 
diff --git a/source/common/src/tmsg.c b/source/common/src/tmsg.c
index 189fa1326f1b42943300c176f2e7723147b4c7d4..155ef7a62a6c6c7c058a59526ff345d01e7fbf41 100644
--- a/source/common/src/tmsg.c
+++ b/source/common/src/tmsg.c
@@ -7437,7 +7437,7 @@ void tDestroySSubmitTbData(SSubmitTbData *pTbData, int32_t flag) {
   }
 }
 
-void tDestroySSubmitReq2(SSubmitReq2 *pReq, int32_t flag) {
+void tDestroySSubmitReq(SSubmitReq2 *pReq, int32_t flag) {
   if (pReq->aSubmitTbData == NULL) return;
 
   int32_t        nSubmitTbData = TARRAY_SIZE(pReq->aSubmitTbData);
diff --git a/source/dnode/vnode/inc/vnode.h b/source/dnode/vnode/inc/vnode.h
index aecfb9c3e53b09fac6509478b095babe949249fd..3bcb1c9d2e4f0156619ce064423ae499f007512c 100644
--- a/source/dnode/vnode/inc/vnode.h
+++ b/source/dnode/vnode/inc/vnode.h
@@ -259,17 +259,14 @@ int32_t tqReaderAddTbUidList(STqReader *pReader, const SArray *pTableUidList);
 int32_t tqReaderRemoveTbUidList(STqReader *pReader, const SArray *tbUidList);
 
 int32_t tqSeekVer(STqReader *pReader, int64_t ver, const char *id);
-void    tqNextBlock(STqReader *pReader, SFetchRet *ret);
+int32_t tqNextBlock(STqReader *pReader, SSDataBlock* pBlock);
 int32_t extractSubmitMsgFromWal(SWalReader *pReader, SPackedData *pPackedData);
 
 int32_t tqReaderSetSubmitMsg(STqReader *pReader, void *msgStr, int32_t msgLen, int64_t ver);
-// int32_t tqReaderSetDataMsg(STqReader *pReader, const SSubmitReq *pMsg, int64_t ver);
-bool    tqNextDataBlock(STqReader *pReader);
-bool    tqNextDataBlockFilterOut2(STqReader *pReader, SHashObj *filterOutUids);
-int32_t tqRetrieveDataBlock2(SSDataBlock *pBlock, STqReader *pReader, SSubmitTbData **pSubmitTbDataRet);
+bool    tqNextBlockImpl(STqReader *pReader);
+bool    tqNextDataBlockFilterOut(STqReader *pReader, SHashObj *filterOutUids);
+int32_t tqRetrieveDataBlock(SSDataBlock *pBlock, STqReader *pReader, SSubmitTbData **pSubmitTbDataRet);
 int32_t tqRetrieveTaosxBlock2(STqReader *pReader, SArray *blocks, SArray *schemas, SSubmitTbData **pSubmitTbDataRet);
-// int32_t tqRetrieveDataBlock(SSDataBlock *pBlock, STqReader *pReader);
-// int32_t tqRetrieveTaosxBlock(STqReader *pReader, SArray *blocks, SArray *schemas);
 
 int32_t vnodeEnqueueStreamMsg(SVnode *pVnode, SRpcMsg *pMsg);
 
diff --git a/source/dnode/vnode/src/sma/smaRollup.c b/source/dnode/vnode/src/sma/smaRollup.c
index ce987ca88ec930db76fcb560ff79f758e2bed1a2..69b3f9c3e02f9daa2fe645f751f9986000919700 100644
--- a/source/dnode/vnode/src/sma/smaRollup.c
+++ b/source/dnode/vnode/src/sma/smaRollup.c
@@ -684,7 +684,7 @@ static int32_t tdRSmaExecAndSubmitResult(SSma *pSma, qTaskInfo_t taskInfo, SRSma
       }
 
       if (pReq && tdProcessSubmitReq(sinkTsdb, output->info.version, pReq) < 0) {
-        tDestroySSubmitReq2(pReq, TSDB_MSG_FLG_ENCODE);
+        tDestroySSubmitReq(pReq, TSDB_MSG_FLG_ENCODE);
         taosMemoryFree(pReq);
         smaError("vgId:%d, process submit req for rsma suid:%" PRIu64 ", uid:%" PRIu64 " level %" PRIi8
                  " failed since %s",
@@ -696,7 +696,7 @@ static int32_t tdRSmaExecAndSubmitResult(SSma *pSma, qTaskInfo_t taskInfo, SRSma
                SMA_VID(pSma), suid, output->info.id.groupId, pItem->level, output->info.version);
 
       if (pReq) {
-        tDestroySSubmitReq2(pReq, TSDB_MSG_FLG_ENCODE);
+        tDestroySSubmitReq(pReq, TSDB_MSG_FLG_ENCODE);
         taosMemoryFree(pReq);
       }
     }
diff --git a/source/dnode/vnode/src/sma/smaTimeRange.c b/source/dnode/vnode/src/sma/smaTimeRange.c
index 5058a7fc76e16c85881a2f7fad30ca8109888263..2a26f65bf99db548532a20c86a2739d3f14eb8e5 100644
--- a/source/dnode/vnode/src/sma/smaTimeRange.c
+++ b/source/dnode/vnode/src/sma/smaTimeRange.c
@@ -332,7 +332,7 @@ _end:
   taosArrayDestroy(tagArray);
   taosArrayDestroy(pVals);
   if (pReq) {
-    tDestroySSubmitReq2(pReq, TSDB_MSG_FLG_ENCODE);
+    tDestroySSubmitReq(pReq, TSDB_MSG_FLG_ENCODE);
     taosMemoryFree(pReq);
   }
 
diff --git a/source/dnode/vnode/src/tq/tqRead.c b/source/dnode/vnode/src/tq/tqRead.c
index 2cda12c0e10fb02bd5928b4f349f75b7d1fad12b..0e9caf24ae4ed6b61de84e6a1c82dbb00f79e152 100644
--- a/source/dnode/vnode/src/tq/tqRead.c
+++ b/source/dnode/vnode/src/tq/tqRead.c
@@ -288,7 +288,7 @@ void tqCloseReader(STqReader* pReader) {
   }
   // free hash
   taosHashCleanup(pReader->tbIdHash);
-  tDestroySSubmitReq2(&pReader->submit, TSDB_MSG_FLG_DECODE);
+  tDestroySSubmitReq(&pReader->submit, TSDB_MSG_FLG_DECODE);
   taosMemoryFree(pReader);
 }
 
@@ -322,12 +322,11 @@ int32_t extractSubmitMsgFromWal(SWalReader* pReader, SPackedData* pPackedData) {
   return 0;
 }
 
-void tqNextBlock(STqReader* pReader, SFetchRet* ret) {
+int32_t tqNextBlock(STqReader* pReader, SSDataBlock* pBlock) {
   while (1) {
     if (pReader->msg2.msgStr == NULL) {
       if (walNextValidMsg(pReader->pWalReader) < 0) {
-        ret->fetchType = FETCH_TYPE__NONE;
-        return;
+        return FETCH_TYPE__NONE;
       }
 
       void*   pBody = POINTER_SHIFT(pReader->pWalReader->pHead->head.body, sizeof(SSubmitReq2Msg));
@@ -337,15 +336,14 @@ void tqNextBlock(STqReader* pReader, SFetchRet* ret) {
       tqReaderSetSubmitMsg(pReader, pBody, bodyLen, ver);
     }
 
-    while (tqNextDataBlock(pReader)) {
-      memset(&ret->data, 0, sizeof(SSDataBlock));
-      int32_t code = tqRetrieveDataBlock2(&ret->data, pReader, NULL);
-      if (code != 0 || ret->data.info.rows == 0) {
+    while (tqNextBlockImpl(pReader)) {
+      memset(pBlock, 0, sizeof(SSDataBlock));
+      int32_t code = tqRetrieveDataBlock(pBlock, pReader, NULL);
+      if (code != TSDB_CODE_SUCCESS || pBlock->info.rows == 0) {
         continue;
       }
 
-      ret->fetchType = FETCH_TYPE__DATA;
-      return;
+      return FETCH_TYPE__DATA;
     }
   }
 }
@@ -367,7 +365,7 @@ int32_t tqReaderSetSubmitMsg(STqReader* pReader, void* msgStr, int32_t msgLen, i
   return 0;
 }
 
-bool tqNextDataBlock(STqReader* pReader) {
+bool tqNextBlockImpl(STqReader* pReader) {
   if (pReader->msg2.msgStr == NULL) {
     return false;
   }
@@ -387,20 +385,20 @@ bool tqNextDataBlock(STqReader* pReader) {
       tqDebug("tq reader block found, ver:%"PRId64", uid:%"PRId64, pReader->msg2.ver, pSubmitTbData->uid);
       return true;
     } else {
-      tqDebug("tq reader discard block, uid:%"PRId64", continue", pSubmitTbData->uid);
+      tqDebug("tq reader discard submit block, uid:%"PRId64", continue", pSubmitTbData->uid);
     }
 
     pReader->nextBlk++;
   }
 
-  tDestroySSubmitReq2(&pReader->submit, TSDB_MSG_FLG_DECODE);
+  tDestroySSubmitReq(&pReader->submit, TSDB_MSG_FLG_DECODE);
   pReader->nextBlk = 0;
   pReader->msg2.msgStr = NULL;
 
   return false;
 }
 
-bool tqNextDataBlockFilterOut2(STqReader* pReader, SHashObj* filterOutUids) {
+bool tqNextDataBlockFilterOut(STqReader* pReader, SHashObj* filterOutUids) {
   if (pReader->msg2.msgStr == NULL) return false;
 
   int32_t blockSz = taosArrayGetSize(pReader->submit.aSubmitTbData);
@@ -415,7 +413,7 @@ bool tqNextDataBlockFilterOut2(STqReader* pReader, SHashObj* filterOutUids) {
     pReader->nextBlk++;
   }
 
-  tDestroySSubmitReq2(&pReader->submit, TSDB_MSG_FLG_DECODE);
+  tDestroySSubmitReq(&pReader->submit, TSDB_MSG_FLG_DECODE);
   pReader->nextBlk = 0;
   pReader->msg2.msgStr = NULL;
 
@@ -451,7 +449,7 @@ int32_t tqMaskBlock(SSchemaWrapper* pDst, SSDataBlock* pBlock, const SSchemaWrap
   return 0;
 }
 
-int32_t tqRetrieveDataBlock2(SSDataBlock* pBlock, STqReader* pReader, SSubmitTbData** pSubmitTbDataRet) {
+int32_t tqRetrieveDataBlock(SSDataBlock* pBlock, STqReader* pReader, SSubmitTbData** pSubmitTbDataRet) {
   tqDebug("tq reader retrieve data block %p, index:%d", pReader->msg2.msgStr, pReader->nextBlk);
   SSubmitTbData* pSubmitTbData = taosArrayGet(pReader->submit.aSubmitTbData, pReader->nextBlk);
   pReader->nextBlk++;
@@ -560,7 +558,7 @@ int32_t tqRetrieveDataBlock2(SSDataBlock* pBlock, STqReader* pReader, SSubmitTbD
       int32_t sourceIdx = 0;
       while (targetIdx < colActual) {
         if(sourceIdx >= numOfCols){
-          tqError("tqRetrieveDataBlock2 sourceIdx:%d >= numOfCols:%d", sourceIdx, numOfCols);
+          tqError("tqRetrieveDataBlock sourceIdx:%d >= numOfCols:%d", sourceIdx, numOfCols);
           goto FAIL;
         }
         SColData*        pCol = taosArrayGet(pCols, sourceIdx);
@@ -568,7 +566,7 @@ int32_t tqRetrieveDataBlock2(SSDataBlock* pBlock, STqReader* pReader, SSubmitTbD
         SColVal          colVal;
 
         if(pCol->nVal != numOfRows){
-          tqError("tqRetrieveDataBlock2 pCol->nVal:%d != numOfRows:%d", pCol->nVal, numOfRows);
+          tqError("tqRetrieveDataBlock pCol->nVal:%d != numOfRows:%d", pCol->nVal, numOfRows);
           goto FAIL;
         }
 
diff --git a/source/dnode/vnode/src/tq/tqScan.c b/source/dnode/vnode/src/tq/tqScan.c
index 1c916d9adb2c6ef7a89d5020d5bf899e1e33857c..e049e2d390c05d017ddbc44819be58f82f427fdd 100644
--- a/source/dnode/vnode/src/tq/tqScan.c
+++ b/source/dnode/vnode/src/tq/tqScan.c
@@ -203,7 +203,7 @@ int32_t tqTaosxScanLog(STQ* pTq, STqHandle* pHandle, SPackedData submit, STaosxR
   if (pExec->subType == TOPIC_SUB_TYPE__TABLE) {
     STqReader* pReader = pExec->pTqReader;
     tqReaderSetSubmitMsg(pReader, submit.msgStr, submit.msgLen, submit.ver);
-    while (tqNextDataBlock(pReader)) {
+    while (tqNextBlockImpl(pReader)) {
       taosArrayClear(pBlocks);
       taosArrayClear(pSchemas);
       SSubmitTbData* pSubmitTbDataRet = NULL;
@@ -262,7 +262,7 @@ int32_t tqTaosxScanLog(STQ* pTq, STqHandle* pHandle, SPackedData submit, STaosxR
   } else if (pExec->subType == TOPIC_SUB_TYPE__DB) {
     STqReader* pReader = pExec->pTqReader;
     tqReaderSetSubmitMsg(pReader, submit.msgStr, submit.msgLen, submit.ver);
-    while (tqNextDataBlockFilterOut2(pReader, pExec->execDb.pFilterOutTbUid)) {
+    while (tqNextDataBlockFilterOut(pReader, pExec->execDb.pFilterOutTbUid)) {
       taosArrayClear(pBlocks);
       taosArrayClear(pSchemas);
       SSubmitTbData* pSubmitTbDataRet = NULL;
diff --git a/source/dnode/vnode/src/tq/tqSink.c b/source/dnode/vnode/src/tq/tqSink.c
index 62b81305b7233edd48e7dab796975b1ab69a7ad3..c2e6946b04ce9627f6c62beab3c833a57d001d44 100644
--- a/source/dnode/vnode/src/tq/tqSink.c
+++ b/source/dnode/vnode/src/tq/tqSink.c
@@ -695,7 +695,7 @@ void tqSinkToTablePipeline2(SStreamTask* pTask, void* vnode, int64_t ver, void*
       len += sizeof(SSubmitReq2Msg);
       pBuf = rpcMallocCont(len);
       if (NULL == pBuf) {
-        tDestroySSubmitReq2(&submitReq, TSDB_MSG_FLG_ENCODE);
+        tDestroySSubmitReq(&submitReq, TSDB_MSG_FLG_ENCODE);
         goto _end;
       }
       ((SSubmitReq2Msg*)pBuf)->header.vgId = TD_VID(pVnode);
@@ -707,11 +707,11 @@ void tqSinkToTablePipeline2(SStreamTask* pTask, void* vnode, int64_t ver, void*
         tqError("failed to encode submit req since %s", terrstr());
         tEncoderClear(&encoder);
         rpcFreeCont(pBuf);
-        tDestroySSubmitReq2(&submitReq, TSDB_MSG_FLG_ENCODE);
+        tDestroySSubmitReq(&submitReq, TSDB_MSG_FLG_ENCODE);
         continue;
       }
       tEncoderClear(&encoder);
-      tDestroySSubmitReq2(&submitReq, TSDB_MSG_FLG_ENCODE);
+      tDestroySSubmitReq(&submitReq, TSDB_MSG_FLG_ENCODE);
 
       SRpcMsg msg = {
           .msgType = TDMT_VND_SUBMIT,
diff --git a/source/dnode/vnode/src/tsdb/tsdbRead.c b/source/dnode/vnode/src/tsdb/tsdbRead.c
index fad2e883aa01e3d80d87b8c43a7eb7b7f3fdc382..a46f7a7924c446b1f21daf2d45a390c9ee63b43a 100644
--- a/source/dnode/vnode/src/tsdb/tsdbRead.c
+++ b/source/dnode/vnode/src/tsdb/tsdbRead.c
@@ -246,8 +246,6 @@ static int32_t       getInitialDelIndex(const SArray* pDelSkyline, int32_t order
 
 static STableBlockScanInfo* getTableBlockScanInfo(SSHashObj* pTableMap, uint64_t uid, const char* id);
 
-static STSchema* getLatestTableSchema(STsdbReader* pReader, uint64_t uid);
-
 static bool outOfTimeWindow(int64_t ts, STimeWindow* pWindow) { return (ts > pWindow->ekey) || (ts < pWindow->skey); }
 
 static int32_t setColumnIdSlotList(SBlockLoadSuppInfo* pSupInfo, SColumnInfo* pCols, const int32_t* pSlotIdList,
@@ -1354,16 +1352,40 @@ static int32_t copyBlockDataToSDataBlock(STsdbReader* pReader) {
   return TSDB_CODE_SUCCESS;
 }
 
+static FORCE_INLINE STSchema* getTableSchemaImpl(STsdbReader* pReader, uint64_t uid) {
+  ASSERT(pReader->pSchema == NULL);
+
+  int32_t code = metaGetTbTSchemaEx(pReader->pTsdb->pVnode->pMeta, pReader->suid, uid, -1, &pReader->pSchema);
+  if (code != TSDB_CODE_SUCCESS || pReader->pSchema == NULL) {
+    terrno = code;
+    tsdbError("failed to get table schema, uid:%" PRIu64 ", it may have been dropped, ver:-1, %s", uid, pReader->idStr);
+    return NULL;
+  }
+
+  code = tsdbRowMergerInit(&pReader->status.merger, pReader->pSchema);
+  if (code != TSDB_CODE_SUCCESS) {
+    terrno = code;
+    tsdbError("failed to init merger, code:%s, %s", tstrerror(code), pReader->idStr);
+    return NULL;
+  }
+
+  return pReader->pSchema;
+}
+
 static int32_t doLoadFileBlockData(STsdbReader* pReader, SDataBlockIter* pBlockIter, SBlockData* pBlockData,
                                    uint64_t uid) {
-  int32_t code = 0;
-  int64_t st = taosGetTimestampUs();
+  int32_t   code = 0;
+  STSchema* pSchema = pReader->pSchema;
+  int64_t   st = taosGetTimestampUs();
 
   tBlockDataReset(pBlockData);
-  STSchema* pSchema = getLatestTableSchema(pReader, uid);
-  if (pSchema == NULL) {
-    tsdbDebug("%p table uid:%" PRIu64 " has been dropped, no data existed, %s", pReader, uid, pReader->idStr);
-    return code;
+
+  if (pReader->pSchema == NULL) {
+    pSchema = getTableSchemaImpl(pReader, uid);
+    if (pSchema == NULL) {
+      tsdbDebug("%p table uid:%" PRIu64 " has been dropped, no data existed, %s", pReader, uid, pReader->idStr);
+      return code;
+    }
   }
 
   SBlockLoadSuppInfo* pSup = &pReader->suppInfo;
@@ -1912,33 +1934,11 @@ static bool tryCopyDistinctRowFromSttBlock(TSDBROW* fRow, SLastBlockReader* pLas
   return code;
 }
 
-STSchema* getLatestTableSchema(STsdbReader* pReader, uint64_t uid) {
-  if (pReader->pSchema != NULL) {
-    return pReader->pSchema;
-  }
-
-  int32_t code = metaGetTbTSchemaEx(pReader->pTsdb->pVnode->pMeta, pReader->suid, uid, -1, &pReader->pSchema);
-  if (code != TSDB_CODE_SUCCESS || pReader->pSchema == NULL) {
-    tsdbError("failed to get table schema, uid:%" PRIu64 ", it may have been dropped, ver:-1, %s", uid, pReader->idStr);
-  }
-
-  return pReader->pSchema;
-}
-
 static FORCE_INLINE STSchema* doGetSchemaForTSRow(int32_t sversion, STsdbReader* pReader, uint64_t uid) {
-  int32_t code = 0;
-
   // always set the newest schema version in pReader->pSchema
   if (pReader->pSchema == NULL) {
-    code = metaGetTbTSchemaEx(pReader->pTsdb->pVnode->pMeta, pReader->suid, uid, -1, &pReader->pSchema);
-    if (code != TSDB_CODE_SUCCESS) {
-      terrno = code;
-      return NULL;
-    }
-
-    code = tsdbRowMergerInit(&pReader->status.merger, pReader->pSchema);
-    if (code != 0) {
-      terrno = code;
+    STSchema* ps = getTableSchemaImpl(pReader, uid);
+    if (ps == NULL) {
       return NULL;
     }
   }
@@ -1953,7 +1953,7 @@ static FORCE_INLINE STSchema* doGetSchemaForTSRow(int32_t sversion, STsdbReader*
   }
 
   STSchema* ptr = NULL;
-  code = metaGetTbTSchemaEx(pReader->pTsdb->pVnode->pMeta, pReader->suid, uid, sversion, &ptr);
+  int32_t code = metaGetTbTSchemaEx(pReader->pTsdb->pVnode->pMeta, pReader->suid, uid, sversion, &ptr);
   if (code != TSDB_CODE_SUCCESS) {
     terrno = code;
     return NULL;
@@ -1982,6 +1982,15 @@ static int32_t doMergeBufAndFileRows(STsdbReader* pReader, STableBlockScanInfo*
   TSDBKEY k = TSDBROW_KEY(pRow);
   TSDBROW fRow = tsdbRowFromBlockData(pBlockData, pDumpInfo->rowIndex);
 
+  // merge is not initialized yet, due to the fact that the pReader->pSchema is not initialized
+  if (pMerger->pArray == NULL) {
+    ASSERT(pReader->pSchema == NULL);
+    STSchema* ps = getTableSchemaImpl(pReader, pBlockScanInfo->uid);
+    if (ps == NULL) {
+      return terrno;
+    }
+  }
+
   int64_t minKey = 0;
   if (pReader->order == TSDB_ORDER_ASC) {
     minKey = INT64_MAX;  // chosen the minimum value
@@ -2011,13 +2020,14 @@ static int32_t doMergeBufAndFileRows(STsdbReader* pReader, STableBlockScanInfo*
     }
   }
 
+  // todo remove init
   bool init = false;
 
   // ASC: file block ---> last block -----> imem -----> mem
   // DESC: mem -----> imem -----> last block -----> file block
   if (pReader->order == TSDB_ORDER_ASC) {
     if (minKey == key) {
-      init = true;  // todo check if pReader->pSchema is null or not
+      init = true;
       int32_t code = tsdbRowMergerAdd(pMerger, &fRow, pReader->pSchema);
       if (code != TSDB_CODE_SUCCESS) {
         return code;
@@ -2203,6 +2213,16 @@ static int32_t doMergeFileBlockAndLastBlock(SLastBlockReader* pLastBlockReader,
 static int32_t mergeFileBlockAndLastBlock(STsdbReader* pReader, SLastBlockReader* pLastBlockReader, int64_t key,
                                           STableBlockScanInfo* pBlockScanInfo, SBlockData* pBlockData) {
   SFileBlockDumpInfo* pDumpInfo = &pReader->status.fBlockDumpInfo;
+  SRowMerger* pMerger = &pReader->status.merger;
+
+  // merge is not initialized yet, due to the fact that the pReader->pSchema is not initialized
+  if (pMerger->pArray == NULL) {
+    ASSERT(pReader->pSchema == NULL);
+    STSchema* ps = getTableSchemaImpl(pReader, pBlockScanInfo->uid);
+    if (ps == NULL) {
+      return terrno;
+    }
+  }
 
   if (hasDataInFileBlock(pBlockData, pDumpInfo)) {
     // no last block available, only data block exists
@@ -2220,8 +2240,6 @@ static int32_t mergeFileBlockAndLastBlock(STsdbReader* pReader, SLastBlockReader
         return mergeRowsInFileBlocks(pBlockData, pBlockScanInfo, key, pReader);
       } else if (key == ts) {
         SRow*       pTSRow = NULL;
-        SRowMerger* pMerger = &pReader->status.merger;
-
         int32_t code = tsdbRowMergerAdd(pMerger, &fRow, pReader->pSchema);
         if (code != TSDB_CODE_SUCCESS) {
           return code;
@@ -2285,6 +2303,15 @@ static int32_t doMergeMultiLevelRows(STsdbReader* pReader, STableBlockScanInfo*
     return code;
   }
 
+  // merge is not initialized yet, due to the fact that the pReader->pSchema is not initialized
+  if (pMerger->pArray == NULL) {
+    ASSERT(pReader->pSchema == NULL);
+    STSchema* ps = getTableSchemaImpl(pReader, pBlockScanInfo->uid);
+    if (ps == NULL) {
+      return terrno;
+    }
+  }
+
   int64_t minKey = 0;
   if (ASCENDING_TRAVERSE(pReader->order)) {
     minKey = INT64_MAX;  // let's find the minimum
@@ -2596,6 +2623,7 @@ bool hasDataInFileBlock(const SBlockData* pBlockData, const SFileBlockDumpInfo*
 
 int32_t mergeRowsInFileBlocks(SBlockData* pBlockData, STableBlockScanInfo* pBlockScanInfo, int64_t key,
                               STsdbReader* pReader) {
+  SRowMerger*         pMerger = &pReader->status.merger;
   SFileBlockDumpInfo* pDumpInfo = &pReader->status.fBlockDumpInfo;
   bool                copied = false;
   int32_t             code = tryCopyDistinctRowFromFileBlock(pReader, pBlockData, key, pDumpInfo, &copied);
@@ -2603,6 +2631,15 @@ int32_t mergeRowsInFileBlocks(SBlockData* pBlockData, STableBlockScanInfo* pBloc
     return code;
   }
 
+  // merge is not initialized yet, due to the fact that the pReader->pSchema is not initialized
+  if (pMerger->pArray == NULL) {
+    ASSERT(pReader->pSchema == NULL);
+    STSchema* ps = getTableSchemaImpl(pReader, pBlockScanInfo->uid);
+    if (ps == NULL) {
+      return terrno;
+    }
+  }
+
   if (copied) {
     pBlockScanInfo->lastKey = key;
     return TSDB_CODE_SUCCESS;
@@ -2610,13 +2647,13 @@ int32_t mergeRowsInFileBlocks(SBlockData* pBlockData, STableBlockScanInfo* pBloc
     TSDBROW fRow = tsdbRowFromBlockData(pBlockData, pDumpInfo->rowIndex);
 
     SRow*      pTSRow = NULL;
-    code = tsdbRowMergerAdd(&pReader->status.merger, &fRow, pReader->pSchema);
+    code = tsdbRowMergerAdd(pMerger, &fRow, pReader->pSchema);
     if (code != TSDB_CODE_SUCCESS) {
       return code;
     }
 
     doMergeRowsInFileBlocks(pBlockData, pBlockScanInfo, pReader);
-    code = tsdbRowMergerGetRow(&pReader->status.merger, &pTSRow);
+    code = tsdbRowMergerGetRow(pMerger, &pTSRow);
     if (code != TSDB_CODE_SUCCESS) {
       return code;
     }
@@ -2624,7 +2661,7 @@ int32_t mergeRowsInFileBlocks(SBlockData* pBlockData, STableBlockScanInfo* pBloc
     code = doAppendRowFromTSRow(pReader->pResBlock, pReader, pTSRow, pBlockScanInfo);
 
     taosMemoryFree(pTSRow);
-    tsdbRowMergerClear(&pReader->status.merger);
+    tsdbRowMergerClear(pMerger);
     return code;
   }
 }
@@ -4412,6 +4449,10 @@ static void setSharedPtr(STsdbReader* pDst, const STsdbReader* pSrc) {
   pDst->pSchema = pSrc->pSchema;
   pDst->pSchemaMap = pSrc->pSchemaMap;
   pDst->pReadSnap = pSrc->pReadSnap;
+
+  if (pDst->pSchema) {
+    tsdbRowMergerInit(&pDst->status.merger, pDst->pSchema);
+  }
 }
 
 void tsdbReaderClose(STsdbReader* pReader) {
diff --git a/source/dnode/vnode/src/vnd/vnodeSvr.c b/source/dnode/vnode/src/vnd/vnodeSvr.c
index 0dfde8f579cb97af21843eea13a9f0d18cd557a5..2e6d452e95335bd6e3cefb230fe22c03947ce153 100644
--- a/source/dnode/vnode/src/vnd/vnodeSvr.c
+++ b/source/dnode/vnode/src/vnd/vnodeSvr.c
@@ -1388,7 +1388,7 @@ _exit:
 
   // clear
   taosArrayDestroy(newTbUids);
-  tDestroySSubmitReq2(pSubmitReq, 0 == pMsg->version ? TSDB_MSG_FLG_CMPT : TSDB_MSG_FLG_DECODE);
+  tDestroySSubmitReq(pSubmitReq, 0 == pMsg->version ? TSDB_MSG_FLG_CMPT : TSDB_MSG_FLG_DECODE);
   tDestroySSubmitRsp2(pSubmitRsp, TSDB_MSG_FLG_ENCODE);
 
   if (code) terrno = code;
diff --git a/source/libs/executor/src/dataInserter.c b/source/libs/executor/src/dataInserter.c
index 90d740bebd8658ced2346292f527e9ecf1ade2cf..22f388d40675243348a52d5d548d6d0ee2dc3ddd 100644
--- a/source/libs/executor/src/dataInserter.c
+++ b/source/libs/executor/src/dataInserter.c
@@ -301,7 +301,7 @@ _end:
   if (terrno != 0) {
     *ppReq = NULL;
     if (pReq) {
-      tDestroySSubmitReq2(pReq, TSDB_MSG_FLG_ENCODE);
+      tDestroySSubmitReq(pReq, TSDB_MSG_FLG_ENCODE);
       taosMemoryFree(pReq);
     }
     return terrno;
@@ -326,7 +326,7 @@ int32_t dataBlocksToSubmitReq(SDataInserterHandle* pInserter, void** pMsg, int32
     code = buildSubmitReqFromBlock(pInserter, &pReq, pDataBlock, pTSchema, uid, vgId, suid);
     if (code) {
       if (pReq) {
-        tDestroySSubmitReq2(pReq, TSDB_MSG_FLG_ENCODE);
+        tDestroySSubmitReq(pReq, TSDB_MSG_FLG_ENCODE);
         taosMemoryFree(pReq);
       }
 
@@ -335,7 +335,7 @@ int32_t dataBlocksToSubmitReq(SDataInserterHandle* pInserter, void** pMsg, int32
   }
 
   code = submitReqToMsg(vgId, pReq, pMsg, msgLen);
-  tDestroySSubmitReq2(pReq, TSDB_MSG_FLG_ENCODE);
+  tDestroySSubmitReq(pReq, TSDB_MSG_FLG_ENCODE);
   taosMemoryFree(pReq);
 
   return code;
diff --git a/source/libs/executor/src/scanoperator.c b/source/libs/executor/src/scanoperator.c
index 2389c7252ef56265f0e695a97fd025b4a4a09675..8542481419d5dcbb4e4c6ebd638947396f48e378 100644
--- a/source/libs/executor/src/scanoperator.c
+++ b/source/libs/executor/src/scanoperator.c
@@ -1646,10 +1646,10 @@ static SSDataBlock* doQueueScan(SOperatorInfo* pOperator) {
     blockDataCleanup(pInfo->pRes);
     SDataBlockInfo* pBlockInfo = &pInfo->pRes->info;
 
-    while (tqNextDataBlock(pInfo->tqReader)) {
+    while (tqNextBlockImpl(pInfo->tqReader)) {
       SSDataBlock block = {0};
 
-      int32_t code = tqRetrieveDataBlock2(&block, pInfo->tqReader, NULL);
+      int32_t code = tqRetrieveDataBlock(&block, pInfo->tqReader, NULL);
       if (code != TSDB_CODE_SUCCESS || block.info.rows == 0) {
         continue;
       }
@@ -1687,23 +1687,23 @@ static SSDataBlock* doQueueScan(SOperatorInfo* pOperator) {
 
   if (pTaskInfo->streamInfo.currentOffset.type == TMQ_OFFSET__LOG) {
     while (1) {
-      SFetchRet ret = {0};
-      tqNextBlock(pInfo->tqReader, &ret);
-      tqOffsetResetToLog(
-          &pTaskInfo->streamInfo.currentOffset,
-          pInfo->tqReader->pWalReader->curVersion - 1);  // curVersion move to next, so currentOffset = curVersion - 1
-
-      if (ret.fetchType == FETCH_TYPE__DATA) {
-        qDebug("doQueueScan get data from log %" PRId64 " rows, version:%" PRId64, ret.data.info.rows,
+      SSDataBlock block = {0};
+      int32_t type = tqNextBlock(pInfo->tqReader, &block);
+
+      // curVersion move to next, so currentOffset = curVersion - 1
+      tqOffsetResetToLog(&pTaskInfo->streamInfo.currentOffset, pInfo->tqReader->pWalReader->curVersion - 1);
+
+      if (type == FETCH_TYPE__DATA) {
+        qDebug("doQueueScan get data from log %" PRId64 " rows, version:%" PRId64, block.info.rows,
                pTaskInfo->streamInfo.currentOffset.version);
         blockDataCleanup(pInfo->pRes);
-        setBlockIntoRes(pInfo, &ret.data, true);
+        setBlockIntoRes(pInfo, &block, true);
         if (pInfo->pRes->info.rows > 0) {
           qDebug("doQueueScan get data from log %" PRId64 " rows, return, version:%" PRId64, pInfo->pRes->info.rows,
                  pTaskInfo->streamInfo.currentOffset.version);
           return pInfo->pRes;
         }
-      } else if (ret.fetchType == FETCH_TYPE__NONE) {
+      } else if (type == FETCH_TYPE__NONE) {
         qDebug("doQueueScan get none from log, return, version:%" PRId64, pTaskInfo->streamInfo.currentOffset.version);
         return NULL;
       }
@@ -2072,11 +2072,10 @@ FETCH_NEXT_BLOCK:
 
       blockDataCleanup(pInfo->pRes);
 
-      while (tqNextDataBlock(pInfo->tqReader)) {
+      while (tqNextBlockImpl(pInfo->tqReader)) {
         SSDataBlock block = {0};
 
-        int32_t code = tqRetrieveDataBlock2(&block, pInfo->tqReader, NULL);
-
+        int32_t code = tqRetrieveDataBlock(&block, pInfo->tqReader, NULL);
         if (code != TSDB_CODE_SUCCESS || block.info.rows == 0) {
           continue;
         }
diff --git a/source/libs/parser/src/parInsertUtil.c b/source/libs/parser/src/parInsertUtil.c
index ac504b9809ad495175d54025d881853d0f443ca9..a3b067b94dab042ef3707027b38135275071cf8b 100644
--- a/source/libs/parser/src/parInsertUtil.c
+++ b/source/libs/parser/src/parInsertUtil.c
@@ -324,7 +324,7 @@ void insDestroyVgroupDataCxt(SVgroupDataCxt* pVgCxt) {
     return;
   }
 
-  tDestroySSubmitReq2(pVgCxt->pData, TSDB_MSG_FLG_ENCODE);
+  tDestroySSubmitReq(pVgCxt->pData, TSDB_MSG_FLG_ENCODE);
   taosMemoryFree(pVgCxt->pData);
   taosMemoryFree(pVgCxt);
 }