diff --git a/source/dnode/vnode/src/tsdb/tsdbMergeTree.c b/source/dnode/vnode/src/tsdb/tsdbMergeTree.c
index 0f78fbfbfb..0b86cae1be 100644
--- a/source/dnode/vnode/src/tsdb/tsdbMergeTree.c
+++ b/source/dnode/vnode/src/tsdb/tsdbMergeTree.c
@@ -166,7 +166,7 @@ static SBlockData *loadLastBlock(SLDataIter *pIter, const char *idStr) {
   pInfo->cost.blockElapsedTime += el;
   pInfo->cost.loadBlocks += 1;
 
-  tsdbDebug("read last block, total load:%" PRId64 ", trigger by uid:%" PRIu64 ", stt-fileVer:%" PRId64
+  tsdbDebug("read stt block, total load:%" PRId64 ", trigger by uid:%" PRIu64 ", stt-fileVer:%" PRId64
             ", last block index:%d, entry:%d, rows:%d, uidRange:%" PRId64 "-%" PRId64 " tsRange:%" PRId64 "-%" PRId64
             " %p, elapsed time:%.2f ms, %s",
             pInfo->cost.loadBlocks, pIter->uid, pIter->cid, pIter->iSttBlk, pInfo->currentLoadBlockIndex, pBlock->nRow,
diff --git a/source/dnode/vnode/src/tsdb/tsdbRead2.c b/source/dnode/vnode/src/tsdb/tsdbRead2.c
index 8a3da23649..1ca42f4578 100644
--- a/source/dnode/vnode/src/tsdb/tsdbRead2.c
+++ b/source/dnode/vnode/src/tsdb/tsdbRead2.c
@@ -631,7 +631,7 @@ static int32_t doLoadFileBlock(STsdbReader* pReader, SArray* pIndexList, SBlockN
 
   double el = (taosGetTimestampUs() - st) / 1000.0;
   tsdbDebug(
-      "load block of %d tables completed, blocks:%d in %d tables, last-files:%d, block-info-size:%.2f Kb, elapsed "
+      "load block of %d tables completed, blocks:%d in %d tables, stt-files:%d, block-info-size:%.2f Kb, elapsed "
       "time:%.2f ms %s",
       numOfTables, pBlockNum->numOfBlocks, (int32_t)taosArrayGetSize(pTableScanInfoList), pBlockNum->numOfSttFiles,
       sizeInDisk / 1000.0, el, pReader->idStr);
@@ -2712,6 +2712,8 @@ static int32_t doLoadSttBlockSequentially(STsdbReader* pReader) {
       pInfo->id.uid = pScanInfo->uid;
       pInfo->dataLoad = 1;
       pInfo->window = pScanInfo->sttWindow;
+      blockDataEnsureCapacity(pResBlock, pInfo->rows);
+
       setComposedBlockFlag(pReader, true);
       pScanInfo->sttKeyInfo.nextProcKey = asc ? pScanInfo->sttWindow.ekey + 1 : pScanInfo->sttWindow.skey - 1;
       pScanInfo->sttKeyInfo.status = STT_FILE_NO_DATA;