diff --git a/source/dnode/vnode/src/vnd/vnodeSvr.c b/source/dnode/vnode/src/vnd/vnodeSvr.c
index d170931e7e..da1a126a76 100644
--- a/source/dnode/vnode/src/vnd/vnodeSvr.c
+++ b/source/dnode/vnode/src/vnd/vnodeSvr.c
@@ -466,10 +466,10 @@ static int32_t vnodeProcessDropStbReq(SVnode *pVnode, int64_t version, void *pRe
   }
 
   // process request
-  // if (metaDropSTable(pVnode->pMeta, version, &req) < 0) {
-  //   rcode = terrno;
-  //   goto _exit;
-  // }
+  if (metaDropSTable(pVnode->pMeta, version, &req) < 0) {
+    rcode = terrno;
+    goto _exit;
+  }
 
   // return rsp
 _exit:
diff --git a/source/libs/executor/src/executorimpl.c b/source/libs/executor/src/executorimpl.c
index 66849e49b8..40b019eb5d 100644
--- a/source/libs/executor/src/executorimpl.c
+++ b/source/libs/executor/src/executorimpl.c
@@ -3507,8 +3507,7 @@ static int32_t handleLimitOffset(SOperatorInfo* pOperator, SSDataBlock* pBlock)
   // check for the limitation in each group
   if (pProjectInfo->limit.limit > 0 && pProjectInfo->curOutput + pRes->info.rows >= pProjectInfo->limit.limit) {
     pRes->info.rows = (int32_t)(pProjectInfo->limit.limit - pProjectInfo->curOutput);
-
-    if (pProjectInfo->slimit.limit != -1 && pProjectInfo->slimit.limit <= pProjectInfo->curGroupOutput) {
+    if (pProjectInfo->slimit.limit > 0 && pProjectInfo->slimit.limit <= pProjectInfo->curGroupOutput) {
       pOperator->status = OP_EXEC_DONE;
     }
 
diff --git a/source/libs/executor/src/groupoperator.c b/source/libs/executor/src/groupoperator.c
index 23226a0134..4fc25688c4 100644
--- a/source/libs/executor/src/groupoperator.c
+++ b/source/libs/executor/src/groupoperator.c
@@ -331,7 +331,6 @@ static SSDataBlock* hashGroupbyAggregate(SOperatorInfo* pOperator) {
   }
 
   pOperator->status = OP_RES_TO_RETURN;
-  closeAllResultRows(&pInfo->binfo.resultRowInfo);
 
 #if 0
   if(pOperator->fpSet.encodeResultRow){
diff --git a/source/libs/executor/src/scanoperator.c b/source/libs/executor/src/scanoperator.c
index ddebba1c9e..a8aad8fe68 100644
--- a/source/libs/executor/src/scanoperator.c
+++ b/source/libs/executor/src/scanoperator.c
@@ -2310,14 +2310,14 @@ SOperatorInfo* createTableMergeScanOperatorInfo(STableScanPhysiNode* pTableScanN
   pInfo->pSortInfo = generateSortByTsInfo(pInfo->cond.order);
   pInfo->pSortInputBlock = createOneDataBlock(pInfo->pResBlock, false);
   int32_t rowSize = pInfo->pResBlock->info.rowSize;
-  pInfo->bufPageSize = rowSize < 1024 ? 1024 : rowSize * 2;
+  int32_t blockMetaSize = (int32_t)blockDataGetSerialMetaSize(pInfo->pResBlock->info.numOfCols);
+  pInfo->bufPageSize = (rowSize * 2 + blockMetaSize) < 1024 ? 1024 : (rowSize * 2 + blockMetaSize);
   pInfo->sortBufSize = pInfo->bufPageSize * 16;
   pInfo->hasGroupId = false;
   pInfo->prefetchedTuple = NULL;
 
   pOperator->name = "TableMergeScanOperator";
-  // TODO : change it
-  pOperator->operatorType = QUERY_NODE_PHYSICAL_PLAN_TABLE_SCAN;
+  pOperator->operatorType = QUERY_NODE_PHYSICAL_PLAN_TABLE_MERGE_SCAN;
   pOperator->blocking = false;
   pOperator->status = OP_NOT_OPENED;
   pOperator->info = pInfo;
diff --git a/source/libs/function/src/builtinsimpl.c b/source/libs/function/src/builtinsimpl.c
index 90700580bd..55900c7c7e 100644
--- a/source/libs/function/src/builtinsimpl.c
+++ b/source/libs/function/src/builtinsimpl.c
@@ -1384,8 +1384,9 @@ int32_t maxFunction(SqlFunctionCtx* pCtx) {
   return TSDB_CODE_SUCCESS;
 }
 
-static void setSelectivityValue(SqlFunctionCtx* pCtx, SSDataBlock* pBlock, const STuplePos* pTuplePos,
-                                int32_t rowIndex);
+static void setNullSelectivityValue(SqlFunctionCtx* pCtx, SSDataBlock* pBlock, int32_t rowIndex);
+
+static void setSelectivityValue(SqlFunctionCtx* pCtx, SSDataBlock* pBlock, const STuplePos* pTuplePos, int32_t rIndex);
 
 int32_t minmaxFunctionFinalize(SqlFunctionCtx* pCtx, SSDataBlock* pBlock) {
   SResultRowEntryInfo* pEntryInfo = GET_RES_INFO(pCtx);
@@ -1407,11 +1408,23 @@ int32_t minmaxFunctionFinalize(SqlFunctionCtx* pCtx, SSDataBlock* pBlock) {
 
   if (pEntryInfo->numOfRes > 0) {
     setSelectivityValue(pCtx, pBlock, &pRes->tuplePos, currentRow);
+  } else {
+    setNullSelectivityValue(pCtx, pBlock, currentRow);
   }
 
   return pEntryInfo->numOfRes;
 }
 
+void setNullSelectivityValue(SqlFunctionCtx* pCtx, SSDataBlock* pBlock, int32_t rowIndex) {
+  for (int32_t j = 0; j < pCtx->subsidiaries.num; ++j) {
+    SqlFunctionCtx* pc = pCtx->subsidiaries.pCtx[j];
+    int32_t      dstSlotId = pc->pExpr->base.resSchema.slotId;
+
+    SColumnInfoData* pDstCol = taosArrayGet(pBlock->pDataBlock, dstSlotId);
+    colDataAppendNULL(pDstCol, rowIndex);
+  }
+}
+
 void setSelectivityValue(SqlFunctionCtx* pCtx, SSDataBlock* pBlock, const STuplePos* pTuplePos, int32_t rowIndex) {
   int32_t pageId = pTuplePos->pageId;
   int32_t offset = pTuplePos->offset;
@@ -4627,8 +4640,6 @@ int32_t tailFinalize(SqlFunctionCtx* pCtx, SSDataBlock* pBlock) {
   for (int32_t i = 0; i < pEntryInfo->numOfRes; ++i) {
     STailItem* pItem = pInfo->pItems[i];
     colDataAppend(pCol, currentRow, pItem->data, false);
-
-    // setSelectivityValue(pCtx, pBlock, &pInfo->pItems[i].tuplePos, currentRow);
     currentRow += 1;
   }