diff --git a/source/dnode/vnode/src/tsdb/tsdbRead.c b/source/dnode/vnode/src/tsdb/tsdbRead.c
index 07d8a2e6a7aac383aa89c346173546341125771b..f65fa1cf2799736f9b440079e2c6c31f078d67cd 100644
--- a/source/dnode/vnode/src/tsdb/tsdbRead.c
+++ b/source/dnode/vnode/src/tsdb/tsdbRead.c
@@ -193,6 +193,8 @@ static int64_t       getCurrentKeyInLastBlock(SLastBlockReader* pLastBlockReader
 static bool          hasDataInLastBlock(SLastBlockReader* pLastBlockReader);
 static int32_t       doBuildDataBlock(STsdbReader* pReader);
 static TSDBKEY       getCurrentKeyInBuf(STableBlockScanInfo* pScanInfo, STsdbReader* pReader);
+static bool          hasDataInFileBlock(const SBlockData* pBlockData, const SFileBlockDumpInfo* pDumpInfo);
+static bool          hasDataInLastBlock(SLastBlockReader* pLastBlockReader);
 
 static bool outOfTimeWindow(int64_t ts, STimeWindow* pWindow) { return (ts > pWindow->ekey) || (ts < pWindow->skey); }
 
@@ -1537,7 +1539,7 @@ static int32_t doMergeBufAndFileRows(STsdbReader* pReader, STableBlockScanInfo*
       minKey = k.ts;
     }
 
-    if (minKey > key && pBlockData->nRow > 0) {
+    if (minKey > key && hasDataInFileBlock(pBlockData, pDumpInfo)) {
       minKey = key;
     }
   } else {
@@ -1550,7 +1552,7 @@ static int32_t doMergeBufAndFileRows(STsdbReader* pReader, STableBlockScanInfo*
       minKey = k.ts;
     }
 
-    if (minKey < key && pBlockData->nRow > 0) {
+    if (minKey < key && hasDataInFileBlock(pBlockData, pDumpInfo)) {
       minKey = key;
     }
   }
@@ -1688,7 +1690,7 @@ static int32_t mergeFileBlockAndLastBlock(STsdbReader* pReader, SLastBlockReader
                                           STableBlockScanInfo* pBlockScanInfo, SBlockData* pBlockData) {
   SFileBlockDumpInfo* pDumpInfo = &pReader->status.fBlockDumpInfo;
 
-  if (pBlockData->nRow > 0) {
+  if (hasDataInFileBlock(pBlockData, pDumpInfo)) {
     // no last block available, only data block exists
     if (!hasDataInLastBlock(pLastBlockReader)) {
       return mergeRowsInFileBlocks(pBlockData, pBlockScanInfo, key, pReader);
@@ -1753,7 +1755,7 @@ static int32_t doMergeMultiLevelRows(STsdbReader* pReader, STableBlockScanInfo*
     tsLast = getCurrentKeyInLastBlock(pLastBlockReader);
   }
 
-  int64_t key = pBlockData->aTSKEY[pDumpInfo->rowIndex];
+  int64_t key = hasDataInFileBlock(pBlockData, pDumpInfo)? pBlockData->aTSKEY[pDumpInfo->rowIndex]:INT64_MIN;
 
   TSDBKEY k = TSDBROW_KEY(pRow);
   TSDBKEY ik = TSDBROW_KEY(piRow);
@@ -1769,7 +1771,7 @@ static int32_t doMergeMultiLevelRows(STsdbReader* pReader, STableBlockScanInfo*
       minKey = ik.ts;
     }
 
-    if (minKey > key && pBlockData->nRow > 0) {
+    if (minKey > key && hasDataInFileBlock(pBlockData, pDumpInfo)) {
       minKey = key;
     }
 
@@ -1786,7 +1788,7 @@ static int32_t doMergeMultiLevelRows(STsdbReader* pReader, STableBlockScanInfo*
       minKey = ik.ts;
     }
 
-    if (minKey < key && pBlockData->nRow > 0) {
+    if (minKey < key && hasDataInFileBlock(pBlockData, pDumpInfo)) {
       minKey = key;
     }
 
@@ -2021,6 +2023,13 @@ static int64_t getCurrentKeyInLastBlock(SLastBlockReader* pLastBlockReader) {
 }
 
 static bool hasDataInLastBlock(SLastBlockReader* pLastBlockReader) { return pLastBlockReader->mergeTree.pIter != NULL; }
+bool hasDataInFileBlock(const SBlockData* pBlockData, const SFileBlockDumpInfo* pDumpInfo) {
+  if (pBlockData->nRow > 0) {
+    ASSERT(pBlockData->nRow == pDumpInfo->totalRows);
+  }
+
+  return pBlockData->nRow > 0 && (!pDumpInfo->allDumped);
+}
 
 int32_t mergeRowsInFileBlocks(SBlockData* pBlockData, STableBlockScanInfo* pBlockScanInfo, int64_t key,
                               STsdbReader* pReader) {
@@ -2052,7 +2061,7 @@ static int32_t buildComposedDataBlockImpl(STsdbReader* pReader, STableBlockScanI
                                           SBlockData* pBlockData, SLastBlockReader* pLastBlockReader) {
   SFileBlockDumpInfo* pDumpInfo = &pReader->status.fBlockDumpInfo;
 
-  int64_t key = (pBlockData->nRow > 0) ? pBlockData->aTSKEY[pDumpInfo->rowIndex] : INT64_MIN;
+  int64_t key = (pBlockData->nRow > 0 && (!pDumpInfo->allDumped)) ? pBlockData->aTSKEY[pDumpInfo->rowIndex] : INT64_MIN;
   if (pBlockScanInfo->iter.hasVal && pBlockScanInfo->iiter.hasVal) {
     return doMergeMultiLevelRows(pReader, pBlockScanInfo, pBlockData, pLastBlockReader);
   } else {