diff --git a/src/client/inc/tscUtil.h b/src/client/inc/tscUtil.h
index 9ef13cccbf08da5a300bdf53f4a26cb165f065a1..0eda49b1f40876f695594e80874c60407e1ca45c 100644
--- a/src/client/inc/tscUtil.h
+++ b/src/client/inc/tscUtil.h
@@ -129,6 +129,8 @@ bool tscIsPointInterpQuery(SQueryInfo* pQueryInfo);
 bool tscIsTWAQuery(SQueryInfo* pQueryInfo);
 bool tscIsSecondStageQuery(SQueryInfo* pQueryInfo);
 bool tscGroupbyColumn(SQueryInfo* pQueryInfo);
+bool tscIsTopbotQuery(SQueryInfo* pQueryInfo);
+int32_t tscGetTopbotQueryParam(SQueryInfo* pQueryInfo);
 
 bool tscNonOrderedProjectionQueryOnSTable(SQueryInfo *pQueryInfo, int32_t tableIndex);
 bool tscOrderedProjectionQueryOnSTable(SQueryInfo* pQueryInfo, int32_t tableIndex);
diff --git a/src/client/src/tscLocalMerge.c b/src/client/src/tscLocalMerge.c
index 8a301d1820d4fc88406c4fe5fa5fe708a3ee92d1..89642a067d46d8742ed060292f64e7ca9e8c9cc3 100644
--- a/src/client/src/tscLocalMerge.c
+++ b/src/client/src/tscLocalMerge.c
@@ -338,11 +338,20 @@ void tscCreateLocalMerger(tExtMemBuffer **pMemBuffer, int32_t numOfBuffer, tOrde
   pReducer->resColModel->capacity = pReducer->nResultBufSize;
   pReducer->finalModel = pFFModel;
 
+  int32_t expandFactor = 1;
   if (finalmodel->rowSize > 0) {
-    pReducer->resColModel->capacity /= finalmodel->rowSize;
+    bool topBotQuery = tscIsTopbotQuery(pQueryInfo);
+    if (topBotQuery) {
+      expandFactor = tscGetTopbotQueryParam(pQueryInfo);
+      pReducer->resColModel->capacity /= (finalmodel->rowSize * expandFactor);
+      pReducer->resColModel->capacity *= expandFactor;
+    } else {
+      pReducer->resColModel->capacity /= finalmodel->rowSize;
+    }
   }
 
   assert(finalmodel->rowSize > 0 && finalmodel->rowSize <= pReducer->rowSize);
+
   pReducer->pFinalRes = calloc(1, pReducer->rowSize * pReducer->resColModel->capacity);
 
   if (pReducer->pTempBuffer == NULL || pReducer->discardData == NULL || pReducer->pResultBuf == NULL ||
@@ -1440,6 +1449,11 @@ int32_t tscDoLocalMerge(SSqlObj *pSql) {
   SQueryInfo    *pQueryInfo = tscGetQueryInfoDetail(pCmd, pCmd->clauseIndex);
   tFilePage     *tmpBuffer = pLocalMerge->pTempBuffer;
 
+  int32_t remain = 1;
+  if (tscIsTopbotQuery(pQueryInfo)) {
+    remain = tscGetTopbotQueryParam(pQueryInfo);
+  }
+
   if (doHandleLastRemainData(pSql)) {
     return TSDB_CODE_SUCCESS;
   }
@@ -1528,7 +1542,7 @@ int32_t tscDoLocalMerge(SSqlObj *pSql) {
          * if the previous group does NOT generate any result (pResBuf->num == 0),
          * continue to process results instead of return results.
          */
-        if ((!sameGroup && pResBuf->num > 0) || (pResBuf->num == pLocalMerge->resColModel->capacity)) {
+        if ((!sameGroup && pResBuf->num > 0) || (pResBuf->num + remain >= pLocalMerge->resColModel->capacity)) {
           // does not belong to the same group
           bool notSkipped = genFinalResults(pSql, pLocalMerge, !sameGroup);
 
diff --git a/src/client/src/tscUtil.c b/src/client/src/tscUtil.c
index 386352bdc741035168aa0158ef41dcea6c7a7a90..438e5618df8e3ee56da72673fdb7c8c71fe936a3 100644
--- a/src/client/src/tscUtil.c
+++ b/src/client/src/tscUtil.c
@@ -271,6 +271,41 @@ bool tscIsTWAQuery(SQueryInfo* pQueryInfo) {
   return false;
 }
 
+bool tscIsTopbotQuery(SQueryInfo* pQueryInfo) {
+  size_t numOfExprs = tscSqlExprNumOfExprs(pQueryInfo);
+  for (int32_t i = 0; i < numOfExprs; ++i) {
+    SSqlExpr* pExpr = tscSqlExprGet(pQueryInfo, i);
+    if (pExpr == NULL) {
+      continue;
+    }
+
+    int32_t functionId = pExpr->functionId;
+    if (functionId == TSDB_FUNC_TOP || functionId == TSDB_FUNC_BOTTOM) {
+      return true;
+    }
+  }
+
+  return false;
+}
+
+int32_t tscGetTopbotQueryParam(SQueryInfo* pQueryInfo) {
+  size_t numOfExprs = tscSqlExprNumOfExprs(pQueryInfo);
+  for (int32_t i = 0; i < numOfExprs; ++i) {
+    SSqlExpr* pExpr = tscSqlExprGet(pQueryInfo, i);
+    if (pExpr == NULL) {
+      continue;
+    }
+
+    int32_t functionId = pExpr->functionId;
+    if (functionId == TSDB_FUNC_TOP || functionId == TSDB_FUNC_BOTTOM) {
+      return (int32_t) pExpr->param[0].i64;
+    }
+  }
+
+  return 0;
+}
+
+
 void tscClearInterpInfo(SQueryInfo* pQueryInfo) {
   if (!tscIsPointInterpQuery(pQueryInfo)) {
     return;
diff --git a/src/query/src/qExecutor.c b/src/query/src/qExecutor.c
index ea117ed47b3a43267e891a49eff79ac759c44511..bd5fdda0f9e0a5a4e7038ed496e2d00a16939884 100644
--- a/src/query/src/qExecutor.c
+++ b/src/query/src/qExecutor.c
@@ -2631,6 +2631,21 @@ int32_t loadDataBlockOnDemand(SQueryRuntimeEnv* pRuntimeEnv, STableScanInfo* pTa
     tsdbRetrieveDataBlockStatisInfo(pTableScanInfo->pQueryHandle, &pBlock->pBlockStatis);
 
     if (pQuery->topBotQuery && pBlock->pBlockStatis != NULL) {
+      { // set previous window
+        if (QUERY_IS_INTERVAL_QUERY(pQuery)) {
+          SResultRow* pResult = NULL;
+
+          bool  masterScan = IS_MASTER_SCAN(pRuntimeEnv);
+          TSKEY k = ascQuery? pBlock->info.window.skey : pBlock->info.window.ekey;
+
+          STimeWindow win = getActiveTimeWindow(pTableScanInfo->pResultRowInfo, k, pQuery);
+          if (setWindowOutputBufByKey(pRuntimeEnv, pTableScanInfo->pResultRowInfo, &win, masterScan, &pResult, groupId,
+                                      pTableScanInfo->pCtx, pTableScanInfo->numOfOutput,
+                                      pTableScanInfo->rowCellInfoOffset) != TSDB_CODE_SUCCESS) {
+            longjmp(pRuntimeEnv->env, TSDB_CODE_QRY_OUT_OF_MEMORY);
+          }
+        }
+      }
       bool load = false;
       for (int32_t i = 0; i < pQuery->numOfOutput; ++i) {
         int32_t functionId = pTableScanInfo->pCtx[i].functionId;
diff --git a/tests/script/general/parser/select_with_tags.sim b/tests/script/general/parser/select_with_tags.sim
index 38a514a51b0fce41e003a1040bf264eeca3bf29a..ab34713d901faabe9e247c7a7d07a33efaf778b5 100644
--- a/tests/script/general/parser/select_with_tags.sim
+++ b/tests/script/general/parser/select_with_tags.sim
@@ -159,6 +159,14 @@ if $data03 != @abc15@ then
    return -1
 endi
 
+#sql select top(c6, 3) from select_tags_mt0 interval(10a)
+#sql select top(c6, 3) from select_tags_mt0 interval(10a) group by tbname;
+
+sql select top(c6, 10) from select_tags_mt0 interval(10a);
+if $rows != 12800 then
+  return -1
+endi
+
 sql select top(c1, 100), tbname, t1, t2 from select_tags_mt0;
 if $rows != 100 then
    return -1