diff --git a/source/dnode/vnode/inc/vnode.h b/source/dnode/vnode/inc/vnode.h
index a4cbfe60f705dda7671351beb6056318d083a362..3b7687359c35b7dd0bc6a190ed735e1c6384fae1 100644
--- a/source/dnode/vnode/inc/vnode.h
+++ b/source/dnode/vnode/inc/vnode.h
@@ -178,7 +178,6 @@ int32_t tsdbReaderOpen(SVnode *pVnode, SQueryTableDataCond *pCond, void *pTableL
 
 void         tsdbReaderClose(STsdbReader *pReader);
 bool         tsdbNextDataBlock(STsdbReader *pReader);
-void         tsdbRetrieveDataBlockInfo(const STsdbReader *pReader, int32_t *rows, uint64_t *uid, STimeWindow *pWindow);
 int32_t      tsdbRetrieveDatablockSMA(STsdbReader *pReader, SSDataBlock *pDataBlock, bool *allHave);
 SSDataBlock *tsdbRetrieveDataBlock(STsdbReader *pTsdbReadHandle, SArray *pColumnIdList);
 int32_t      tsdbReaderReset(STsdbReader *pReader, SQueryTableDataCond *pCond);
diff --git a/source/dnode/vnode/src/tsdb/tsdbMergeTree.c b/source/dnode/vnode/src/tsdb/tsdbMergeTree.c
index af1a42d018919b81dac90a8a27124f5eb9a15b65..132b7c797c432502596ff701aa3dc0d133c5d5dc 100644
--- a/source/dnode/vnode/src/tsdb/tsdbMergeTree.c
+++ b/source/dnode/vnode/src/tsdb/tsdbMergeTree.c
@@ -515,7 +515,7 @@ bool tLDataIterNextRow(SLDataIter *pIter, const char *idStr) {
   pIter->rInfo.row = tsdbRowFromBlockData(pBlockData, pIter->iRow);
 
 _exit:
-  return (terrno == TSDB_CODE_SUCCESS) && (pIter->pSttBlk != NULL);
+  return (terrno == TSDB_CODE_SUCCESS) && (pIter->pSttBlk != NULL) && (pBlockData != NULL);
 }
 
 SRowInfo *tLDataIterGet(SLDataIter *pIter) { return &pIter->rInfo; }
diff --git a/source/dnode/vnode/src/tsdb/tsdbRead.c b/source/dnode/vnode/src/tsdb/tsdbRead.c
index 717b76046a6f79c75c4f6346b185f21510e881e1..0e9b3c9407baea430dd4b388f4d811c2e6ef72c9 100644
--- a/source/dnode/vnode/src/tsdb/tsdbRead.c
+++ b/source/dnode/vnode/src/tsdb/tsdbRead.c
@@ -220,6 +220,8 @@ static bool          hasDataInFileBlock(const SBlockData* pBlockData, const SFil
 static void          initBlockDumpInfo(STsdbReader* pReader, SDataBlockIter* pBlockIter);
 static int32_t       getInitialDelIndex(const SArray* pDelSkyline, int32_t order);
 
+static FORCE_INLINE 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,
@@ -998,7 +1000,7 @@ static void copyNumericCols(const SColData* pData, SFileBlockDumpInfo* pDumpInfo
   }
 }
 
-static int32_t copyBlockDataToSDataBlock(STsdbReader* pReader, STableBlockScanInfo* pBlockScanInfo) {
+static int32_t copyBlockDataToSDataBlock(STsdbReader* pReader) {
   SReaderStatus*      pStatus = &pReader->status;
   SDataBlockIter*     pBlockIter = &pStatus->blockIter;
   SBlockLoadSuppInfo* pSupInfo = &pReader->suppInfo;
@@ -1015,6 +1017,14 @@ static int32_t copyBlockDataToSDataBlock(STsdbReader* pReader, STableBlockScanIn
   bool    asc = ASCENDING_TRAVERSE(pReader->order);
   int32_t step = asc ? 1 : -1;
 
+  // no data exists, return directly.
+  if (pBlockData->nRow == 0 || pBlockData->aTSKEY == 0) {
+    tsdbWarn("%p no need to copy since no data in blockData, table uid:%" PRIu64 " has been dropped, %s", pReader, pBlockInfo->uid,
+              pReader->idStr);
+    pResBlock->info.rows = 0;
+    return 0;
+  }
+
   if ((pDumpInfo->rowIndex == 0 && asc) || (pDumpInfo->rowIndex == pBlock->nRow - 1 && (!asc))) {
     if (asc && pReader->window.skey <= pBlock->minKey.ts) {
       // pDumpInfo->rowIndex = 0;
@@ -1128,12 +1138,19 @@ static int32_t copyBlockDataToSDataBlock(STsdbReader* pReader, STableBlockScanIn
 
 static int32_t doLoadFileBlockData(STsdbReader* pReader, SDataBlockIter* pBlockIter, SBlockData* pBlockData,
                                    uint64_t uid) {
+  int32_t code = 0;
   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;
+  }
+
+  SBlockLoadSuppInfo* pSup = &pReader->suppInfo;
   TABLEID tid = {.suid = pReader->suid, .uid = uid};
-  int32_t code =
-      tBlockDataInit(pBlockData, &tid, pReader->pSchema, &pReader->suppInfo.colId[1], pReader->suppInfo.numOfCols - 1);
+  code = tBlockDataInit(pBlockData, &tid, pSchema, &pSup->colId[1], pSup->numOfCols - 1);
   if (code != TSDB_CODE_SUCCESS) {
     return code;
   }
@@ -1656,6 +1673,19 @@ static bool tryCopyDistinctRowFromSttBlock(TSDBROW* fRow, SLastBlockReader* pLas
   return false;
 }
 
+static FORCE_INLINE STSchema* getLatestTableSchema(STsdbReader* pReader, uint64_t uid) {
+  if (pReader->pSchema != NULL) {
+    return pReader->pSchema;
+  }
+
+  pReader->pSchema = metaGetTbTSchema(pReader->pTsdb->pVnode->pMeta, uid, -1, 1);
+  if (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) {
   // always set the newest schema version in pReader->pSchema
   if (pReader->pSchema == NULL) {
@@ -2459,7 +2489,7 @@ static int32_t buildComposedDataBlock(STsdbReader* pReader) {
     if (isCleanFileDataBlock(pReader, pBlockInfo, pBlock, pBlockScanInfo, keyInBuf, pLastBlockReader) &&
         pBlock->nRow <= pReader->capacity) {
       if (asc || ((!asc) && (!hasDataInLastBlock(pLastBlockReader)))) {
-        copyBlockDataToSDataBlock(pReader, pBlockScanInfo);
+        copyBlockDataToSDataBlock(pReader);
 
         // record the last key value
         pBlockScanInfo->lastKey = asc ? pBlock->maxKey.ts : pBlock->minKey.ts;
@@ -2936,8 +2966,7 @@ static int32_t doBuildDataBlock(STsdbReader* pReader) {
 
       // update the last key for the corresponding table
       pScanInfo->lastKey = ASCENDING_TRAVERSE(pReader->order) ? pInfo->window.ekey : pInfo->window.skey;
-      tsdbDebug("%p uid:%" PRIu64
-                " clean file block retrieved from file, global index:%d, "
+      tsdbDebug("%p uid:%" PRIu64 " clean file block retrieved from file, global index:%d, "
                 "table index:%d, rows:%d, brange:%" PRId64 "-%" PRId64 ", %s",
                 pReader, pScanInfo->uid, pBlockIter->index, pBlockInfo->tbBlockIdx, pBlock->nRow, pBlock->minKey.ts,
                 pBlock->maxKey.ts, pReader->idStr);
@@ -3867,6 +3896,8 @@ int32_t tsdbReaderOpen(SVnode* pVnode, SQueryTableDataCond* pCond, void* pTableL
   //  no valid error code set in metaGetTbTSchema, so let's set the error code here.
   //  we should proceed in case of tmq processing.
   if (pCond->suid != 0) {
+    taosSsleep(20);
+
     pReader->pSchema = metaGetTbTSchema(pReader->pTsdb->pVnode->pMeta, pReader->suid, -1, 1);
     if (pReader->pSchema == NULL) {
       tsdbError("failed to get table schema, suid:%" PRIu64 ", ver:-1, %s", pReader->suid, pReader->idStr);
@@ -4029,9 +4060,11 @@ void tsdbReaderClose(STsdbReader* pReader) {
 
   taosMemoryFree(pReader->idStr);
   taosMemoryFree(pReader->pSchema);
+
   if (pReader->pMemSchema != pReader->pSchema) {
     taosMemoryFree(pReader->pMemSchema);
   }
+
   taosMemoryFreeClear(pReader);
 }
 
@@ -4111,26 +4144,6 @@ bool tsdbNextDataBlock(STsdbReader* pReader) {
   return false;
 }
 
-static void setBlockInfo(const STsdbReader* pReader, int32_t* rows, uint64_t* uid, STimeWindow* pWindow) {
-  *rows = pReader->pResBlock->info.rows;
-  *uid = pReader->pResBlock->info.id.uid;
-  *pWindow = pReader->pResBlock->info.window;
-}
-
-void tsdbRetrieveDataBlockInfo(const STsdbReader* pReader, int32_t* rows, uint64_t* uid, STimeWindow* pWindow) {
-  if (pReader->type == TIMEWINDOW_RANGE_EXTERNAL) {
-    if (pReader->step == EXTERNAL_ROWS_MAIN) {
-      setBlockInfo(pReader, rows, uid, pWindow);
-    } else if (pReader->step == EXTERNAL_ROWS_PREV) {
-      setBlockInfo(pReader->innerReader[0], rows, uid, pWindow);
-    } else {
-      setBlockInfo(pReader->innerReader[1], rows, uid, pWindow);
-    }
-  } else {
-    setBlockInfo(pReader, rows, uid, pWindow);
-  }
-}
-
 static void doFillNullColSMA(SBlockLoadSuppInfo* pSup, int32_t numOfRows, int32_t numOfCols, SColumnDataAgg* pTsAgg) {
   // do fill all null column value SMA info
   int32_t i = 0, j = 0;
@@ -4266,7 +4279,7 @@ static SSDataBlock* doRetrieveDataBlock(STsdbReader* pReader) {
     return NULL;
   }
 
-  copyBlockDataToSDataBlock(pReader, pBlockScanInfo);
+  copyBlockDataToSDataBlock(pReader);
   return pReader->pResBlock;
 }