diff --git a/source/dnode/vnode/src/tsdb/tsdbRead.c b/source/dnode/vnode/src/tsdb/tsdbRead.c
index 1b162bf4888b9da95884aca01a014157c723bad1..03985654f88bfda5caac87980bea7c53e4f404d7 100644
--- a/source/dnode/vnode/src/tsdb/tsdbRead.c
+++ b/source/dnode/vnode/src/tsdb/tsdbRead.c
@@ -431,6 +431,12 @@ static int32_t tsdbReaderCreate(SVnode* pVnode, SQueryTableDataCond* pCond, STsd
 
   pSup->tsColAgg.colId = PRIMARYKEY_TIMESTAMP_COL_ID;
 
+  code = tBlockDataInit(&pReader->status.fileBlockData);
+  if (code != TSDB_CODE_SUCCESS) {
+    terrno = code;
+    goto _end;
+  }
+
   pReader->pResBlock = createResBlock(pCond, pReader->capacity);
   if (pReader->pResBlock == NULL) {
     code = terrno;
@@ -1200,8 +1206,9 @@ static int32_t buildDataBlockFromBuf(STsdbReader* pReader, STableBlockScanInfo*
 }
 
 static int32_t doMergeBufAndFileRows(STsdbReader* pReader, STableBlockScanInfo* pBlockScanInfo, TSDBROW* pRow,
-                                     STSRow* pTSRow, SIterInfo* pIter, int64_t key) {
+                                     SIterInfo* pIter, int64_t key) {
   SRowMerger          merge = {0};
+  STSRow*             pTSRow = NULL;
   SBlockData*         pBlockData = &pReader->status.fileBlockData;
   SFileBlockDumpInfo* pDumpInfo = &pReader->status.fBlockDumpInfo;
 
@@ -1250,6 +1257,8 @@ static int32_t doMergeBufAndFileRows(STsdbReader* pReader, STableBlockScanInfo*
 
   tRowMergerClear(&merge);
   doAppendOneRow(pReader->pResBlock, pReader, pTSRow);
+
+  taosMemoryFree(pTSRow);
   return TSDB_CODE_SUCCESS;
 }
 
@@ -1411,8 +1420,6 @@ static int32_t buildComposedDataBlockImpl(STsdbReader* pReader, STableBlockScanI
   SFileBlockDumpInfo* pDumpInfo = &pReader->status.fBlockDumpInfo;
   SBlockData*         pBlockData = &pReader->status.fileBlockData;
 
-  STSRow*    pTSRow = NULL;
-
   int64_t  key = pBlockData->aTSKEY[pDumpInfo->rowIndex];
   TSDBROW* pRow = getValidRow(&pBlockScanInfo->iter, pBlockScanInfo->delSkyline, pReader);
   TSDBROW* piRow = getValidRow(&pBlockScanInfo->iiter, pBlockScanInfo->delSkyline, pReader);
@@ -1422,23 +1429,27 @@ static int32_t buildComposedDataBlockImpl(STsdbReader* pReader, STableBlockScanI
   } else {
     // imem + file
     if (pBlockScanInfo->iiter.hasVal) {
-      return doMergeBufAndFileRows(pReader, pBlockScanInfo, piRow, pTSRow, &pBlockScanInfo->iiter, key);
+      return doMergeBufAndFileRows(pReader, pBlockScanInfo, piRow, &pBlockScanInfo->iiter, key);
     }
 
     // mem + file
     if (pBlockScanInfo->iter.hasVal) {
-      return doMergeBufAndFileRows(pReader, pBlockScanInfo, pRow, pTSRow, &pBlockScanInfo->iter, key);
+      return doMergeBufAndFileRows(pReader, pBlockScanInfo, pRow, &pBlockScanInfo->iter, key);
     }
 
     // imem & mem are all empty, only file exist
     TSDBROW fRow = tsdbRowFromBlockData(pBlockData, pDumpInfo->rowIndex);
 
+    STSRow*    pTSRow = NULL;
     SRowMerger merge = {0};
+
     tRowMergerInit(&merge, &fRow, pReader->pSchema);
     doMergeRowsInFileBlocks(pBlockData, pBlockScanInfo, pReader, &merge);
     tRowMergerGetRow(&merge, &pTSRow);
     doAppendOneRow(pReader->pResBlock, pReader, pTSRow);
 
+    taosMemoryFree(pTSRow);
+    tRowMergerClear(&merge);
     return TSDB_CODE_SUCCESS;
   }
 }
@@ -1716,7 +1727,8 @@ static int32_t doBuildDataBlock(STsdbReader* pReader) {
 
   TSDBKEY key = getCurrentKeyInBuf(pBlockIter, pReader);
   if (fileBlockShouldLoad(pReader, pFBlock, pBlock, pScanInfo, key)) {
-    tBlockDataInit(&pStatus->fileBlockData);
+    tBlockDataReset(&pStatus->fileBlockData);
+    tBlockDataClearData(&pStatus->fileBlockData);
     code = doLoadFileBlockData(pReader, pBlockIter, pScanInfo, &pStatus->fileBlockData);
     if (code != TSDB_CODE_SUCCESS) {
       return code;
@@ -2160,6 +2172,8 @@ static int32_t checkForNeighborFileBlock(STsdbReader* pReader, STableBlockScanIn
     setFileBlockActiveInBlockIter(pBlockIter, neighborIndex, step);
 
     // 3. load the neighbor block, and set it to be the currently accessed file data block
+    tBlockDataReset(&pStatus->fileBlockData);
+    tBlockDataClearData(&pStatus->fileBlockData);
     int32_t code = doLoadFileBlockData(pReader, pBlockIter, pScanInfo, &pStatus->fileBlockData);
     if (code != TSDB_CODE_SUCCESS) {
       return code;
@@ -2563,6 +2577,7 @@ void tsdbReaderClose(STsdbReader* pReader) {
     }
   }
   taosMemoryFree(pSupInfo->buildBuf);
+  tBlockDataClear(&pReader->status.fileBlockData, true);
 
   cleanupDataBlockIterator(&pReader->status.blockIter);
 
@@ -2760,13 +2775,9 @@ static SArray* doRetrieveDataBlock(STsdbReader* pReader) {
   SFileDataBlockInfo*  pFBlock = getCurrentBlockInfo(&pStatus->blockIter);
   STableBlockScanInfo* pBlockScanInfo = taosHashGet(pStatus->pTableMap, &pFBlock->uid, sizeof(pFBlock->uid));
 
-  int32_t code = tBlockDataInit(&pStatus->fileBlockData);
-  if (code != TSDB_CODE_SUCCESS) {
-    terrno = code;
-    return NULL;
-  }
-
-  code = doLoadFileBlockData(pReader, &pStatus->blockIter, pBlockScanInfo, &pStatus->fileBlockData);
+  tBlockDataReset(&pStatus->fileBlockData);
+  tBlockDataClearData(&pStatus->fileBlockData);
+  int32_t code = doLoadFileBlockData(pReader, &pStatus->blockIter, pBlockScanInfo, &pStatus->fileBlockData);
   if (code != TSDB_CODE_SUCCESS) {
     tBlockDataClear(&pStatus->fileBlockData, 1);
 
@@ -2775,7 +2786,6 @@ static SArray* doRetrieveDataBlock(STsdbReader* pReader) {
   }
 
   copyBlockDataToSDataBlock(pReader, pBlockScanInfo);
-  tBlockDataClear(&pStatus->fileBlockData, 1);
   return pReader->pResBlock->pDataBlock;
 }
 
@@ -2872,9 +2882,7 @@ int32_t tsdbGetFileBlocksDistInfo(STsdbReader* pReader, STableBlockDistInfo* pTa
 
   while (true) {
     if (hasNext) {
-      SFileDataBlockInfo*  pFBlock = getCurrentBlockInfo(pBlockIter);
-      STableBlockScanInfo* pScanInfo = taosHashGet(pStatus->pTableMap, &pFBlock->uid, sizeof(pFBlock->uid));
-      SBlock*              pBlock = taosArrayGet(pScanInfo->pBlockList, pFBlock->tbBlockIdx);
+      SBlock* pBlock = getCurrentBlock(pBlockIter);
 
       int32_t numOfRows = pBlock->nRow;
       pTableBlockInfo->totalRows += numOfRows;
@@ -2895,7 +2903,6 @@ int32_t tsdbGetFileBlocksDistInfo(STsdbReader* pReader, STableBlockDistInfo* pTa
       pTableBlockInfo->blockRowsHisto[bucketIndex]++;
 
       hasNext = blockIteratorNext(&pStatus->blockIter);
-
     } else {
       code = initForFirstBlockInFile(pReader, pBlockIter);
       if ((code != TSDB_CODE_SUCCESS) || (pReader->status.loadFromFile == false)) {
diff --git a/source/dnode/vnode/src/tsdb/tsdbUtil.c b/source/dnode/vnode/src/tsdb/tsdbUtil.c
index 805e49a705ebaadc4dd8447f2beb31174cad6608..3e05b75dd010ec2336115efa8354e2892c07afa7 100644
--- a/source/dnode/vnode/src/tsdb/tsdbUtil.c
+++ b/source/dnode/vnode/src/tsdb/tsdbUtil.c
@@ -1022,6 +1022,10 @@ void tBlockDataClear(SBlockData *pBlockData, int8_t deepClear) {
   tFree((uint8_t *)pBlockData->aTSKEY);
   taosArrayDestroy(pBlockData->aIdx);
   taosArrayDestroyEx(pBlockData->aColData, deepClear ? tColDataClear : NULL);
+  pBlockData->aColData = NULL;
+  pBlockData->aIdx = NULL;
+  pBlockData->aTSKEY = NULL;
+  pBlockData->aVersion = NULL;
 }
 
 int32_t tBlockDataSetSchema(SBlockData *pBlockData, STSchema *pTSchema) {
diff --git a/source/libs/executor/src/executorimpl.c b/source/libs/executor/src/executorimpl.c
index 962f37a8f7ac339de08809d46d0ae32510f24273..525d7bf33658b906c37159047da31d6b947448c1 100644
--- a/source/libs/executor/src/executorimpl.c
+++ b/source/libs/executor/src/executorimpl.c
@@ -3209,9 +3209,8 @@ static void doHandleRemainBlockFromNewGroup(SFillOperatorInfo* pInfo, SResultInf
   if (taosFillHasMoreResults(pInfo->pFillInfo)) {
     int32_t numOfResultRows = pResultInfo->capacity - pInfo->pRes->info.rows;
     taosFillResultDataBlock(pInfo->pFillInfo, pInfo->pRes, numOfResultRows);
-    if (pInfo->pRes->info.rows > pResultInfo->threshold) {
-      return;
-    }
+    pInfo->pRes->info.groupId = pInfo->curGroupId;
+    return;
   }
 
   // handle the cached new group data block
@@ -3230,7 +3229,7 @@ static SSDataBlock* doFillImpl(SOperatorInfo* pOperator) {
   blockDataCleanup(pResBlock);
 
   doHandleRemainBlockFromNewGroup(pInfo, pResultInfo, pTaskInfo);
-  if (pResBlock->info.rows > pResultInfo->threshold || pResBlock->info.rows > 0) {
+  if (pResBlock->info.rows > 0) {
     pResBlock->info.groupId = pInfo->curGroupId;
     return pResBlock;
   }
diff --git a/source/libs/executor/src/projectoperator.c b/source/libs/executor/src/projectoperator.c
index 1edc08655159749faf63c2bf957019576d4f622c..53e25c7e9731b7bbef92b85647c36fadf13da257 100644
--- a/source/libs/executor/src/projectoperator.c
+++ b/source/libs/executor/src/projectoperator.c
@@ -292,7 +292,9 @@ SSDataBlock* doProjectOperation(SOperatorInfo* pOperator) {
 
       // do apply filter
       doFilter(pProjectInfo->pFilterNode, pFinalRes, NULL);
-      if (pFinalRes->info.rows > 0 || pRes->info.rows == 0) {
+
+      // when apply the limit/offset for each group, pRes->info.rows may be 0, due to limit constraint.
+      if (pFinalRes->info.rows > 0 || (pOperator->status == OP_EXEC_DONE)) {
         break;
       }
     } else {
diff --git a/tests/script/tsim/parser/lastrow_query.sim b/tests/script/tsim/parser/lastrow_query.sim
index 282761d8208367d6df8cf80ba921a17daa5b6591..be8f089a790b3c13e7eee95931b2b6986a62fe07 100644
--- a/tests/script/tsim/parser/lastrow_query.sim
+++ b/tests/script/tsim/parser/lastrow_query.sim
@@ -131,7 +131,7 @@ if $rows != 172798 then
 endi
 
 sql select t1,t1,count(*),tbname,t1,t1,tbname from lr_stb0 where ts>'2018-09-24 00:00:00.000' and ts<'2018-09-25 00:00:00.000' partition by tbname, t1 interval(1s) fill(NULL) slimit 1 soffset 0 limit 250000 offset 1
-if $rows != 85648 then
+if $rows != 86399 then
   return -1
 endi
 
@@ -146,7 +146,7 @@ if $rows != 4 then
 endi
 
 sql select t1,t1,count(*),tbname,t1,t1,tbname from lr_stb0 where ts>'2018-09-24 00:00:00.000' and ts<'2018-09-25 00:00:00.000' partition by tbname, t1 interval(1s) fill(NULL) slimit 1 soffset 1 limit 250000 offset 1
-if $rows != 87150 then
+if $rows != 86399 then
   return -1
 endi