diff --git a/source/dnode/vnode/src/tsdb/tsdbRead.c b/source/dnode/vnode/src/tsdb/tsdbRead.c
index e0e2272081ac2baa254476aed683a06cce93fce9..f5d55b5bdaedb4318f1d82d881775f0e6aa9c4d3 100644
--- a/source/dnode/vnode/src/tsdb/tsdbRead.c
+++ b/source/dnode/vnode/src/tsdb/tsdbRead.c
@@ -229,10 +229,10 @@ static SHashObj* createDataBlockScanInfo(STsdbReader* pTsdbReader, const STableK
   for (int32_t j = 0; j < numOfTables; ++j) {
     STableBlockScanInfo info = {.lastKey = 0, .uid = idList[j].uid};
     if (ASCENDING_TRAVERSE(pTsdbReader->order)) {
-      if (info.lastKey == INT64_MIN || info.lastKey < pTsdbReader->window.skey) {
-        info.lastKey = pTsdbReader->window.skey;
-      }
-
+      info.lastKey = pTsdbReader->window.skey;
+//      if (info.lastKey == INT64_MIN || info.lastKey < pTsdbReader->window.skey) {
+//        info.lastKey = pTsdbReader->window.skey - step;
+//      }
       ASSERT(info.lastKey >= pTsdbReader->window.skey && info.lastKey <= pTsdbReader->window.ekey);
     } else {
       info.lastKey = pTsdbReader->window.ekey;
@@ -1854,8 +1854,6 @@ static bool isValidFileBlockRow(SBlockData* pBlockData, SFileBlockDumpInfo* pDum
 static bool outOfTimeWindow(int64_t ts, STimeWindow* pWindow) { return (ts > pWindow->ekey) || (ts < pWindow->skey); }
 
 static bool nextRowFromLastBlocks(SLastBlockReader* pLastBlockReader, STableBlockScanInfo* pBlockScanInfo) {
-  int32_t step = ASCENDING_TRAVERSE(pLastBlockReader->order)? 1:-1;
-
   while (1) {
     bool hasVal = tMergeTreeNext(&pLastBlockReader->mergeTree);
     if (!hasVal) {
@@ -1865,65 +1863,9 @@ static bool nextRowFromLastBlocks(SLastBlockReader* pLastBlockReader, STableBloc
     TSDBROW row = tMergeTreeGetRow(&pLastBlockReader->mergeTree);
     TSDBKEY k = TSDBROW_KEY(&row);
     if (!hasBeenDropped(pBlockScanInfo->delSkyline, &pBlockScanInfo->lastBlockDelIndex, &k, pLastBlockReader->order)) {
-      pBlockScanInfo->lastKey = k.ts + step;
       return true;
     }
   }
-
-#if 0
-  *(pLastBlockReader->rowIndex) += step;
-
-  SBlockData* pBlockData = &pLastBlockReader->lastBlockData;
-  for (int32_t i = *(pLastBlockReader->rowIndex); i < pBlockData->nRow && i >= 0; i += step) {
-    if (pBlockData->aUid != NULL) {
-      if (asc) {
-        if (pBlockData->aUid[i] < pLastBlockReader->uid) {
-          continue;
-        } else if (pBlockData->aUid[i] > pLastBlockReader->uid) {
-          break;
-        }
-      } else {
-        if (pBlockData->aUid[i] > pLastBlockReader->uid) {
-          continue;
-        } else if (pBlockData->aUid[i] < pLastBlockReader->uid) {
-          break;
-        }
-      }
-    }
-
-    int64_t ts = pBlockData->aTSKEY[i];
-    if (ts < pLastBlockReader->window.skey) {
-      continue;
-    }
-
-    int64_t ver = pBlockData->aVersion[i];
-    if (ver < pLastBlockReader->verRange.minVer) {
-      continue;
-    }
-
-    // no data any more, todo opt handle desc case
-    if (ts > pLastBlockReader->window.ekey) {
-      continue;
-    }
-
-    // todo opt handle desc case
-    if (ver > pLastBlockReader->verRange.maxVer) {
-      continue;
-    }
-
-    TSDBKEY k = {.ts = ts, .version = ver};
-    if (hasBeenDropped(pBlockScanInfo->delSkyline, &pBlockScanInfo->lastBlockDelIndex, &k, pLastBlockReader->order)) {
-      continue;
-    }
-
-    *(pLastBlockReader->rowIndex) = i;
-    return true;
-  }
-
-  // set all data is consumed in last block
-  setAllRowsChecked(pLastBlockReader);
-  return false;
-#endif
 }
 
 static bool initLastBlockReader(SLastBlockReader* pLastBlockReader, STableBlockScanInfo* pBlockScanInfo,
@@ -1940,11 +1882,12 @@ static bool initLastBlockReader(SLastBlockReader* pLastBlockReader, STableBlockS
   initMemDataIterator(pBlockScanInfo, pReader);
   pLastBlockReader->uid = pBlockScanInfo->uid;
 
+  int32_t step = ASCENDING_TRAVERSE(pLastBlockReader->order)? 1:-1;
   STimeWindow w = pLastBlockReader->window;
   if (ASCENDING_TRAVERSE(pLastBlockReader->order)) {
-    w.skey = pBlockScanInfo->lastKey;
+    w.skey = pBlockScanInfo->lastKey + step;
   } else {
-    w.ekey = pBlockScanInfo->lastKey;
+    w.ekey = pBlockScanInfo->lastKey + step;
   }
 
   int32_t code =
@@ -2915,6 +2858,7 @@ int32_t doMergeRowsInFileBlocks(SBlockData* pBlockData, STableBlockScanInfo* pSc
 
 int32_t doMergeRowsInLastBlock(SLastBlockReader* pLastBlockReader, STableBlockScanInfo* pScanInfo, int64_t ts,
                                SRowMerger* pMerger) {
+  pScanInfo->lastKey = ts;
   while (nextRowFromLastBlocks(pLastBlockReader, pScanInfo)) {
     int64_t next1 = getCurrentKeyInLastBlock(pLastBlockReader);
     if (next1 == ts) {