diff --git a/src/client/src/tscUtil.c b/src/client/src/tscUtil.c
index 36b8363f94ba6bc0a7ca87b0e70b46c539316af5..585865fb23adb9b5c8c6c7f5f1367a4532f12d41 100644
--- a/src/client/src/tscUtil.c
+++ b/src/client/src/tscUtil.c
@@ -5186,7 +5186,8 @@ int32_t tscCreateQueryFromQueryInfo(SQueryInfo* pQueryInfo, SQueryAttr* pQueryAt
   }
 
   // global aggregate query
-  if (pQueryAttr->stableQuery && (pQueryAttr->simpleAgg || pQueryAttr->interval.interval > 0) && tscIsTwoStageSTableQuery(pQueryInfo, 0)) {
+  if (pQueryAttr->stableQuery && (pQueryAttr->simpleAgg || pQueryAttr->interval.interval > 0 || pQueryAttr->sw.gap > 0)
+      && tscIsTwoStageSTableQuery(pQueryInfo, 0)) {
     createGlobalAggregateExpr(pQueryAttr, pQueryInfo);
   }
 
diff --git a/tests/develop-test/fulltest-query.sh b/tests/develop-test/fulltest-query.sh
index f87dbdbb65a5f2a09273bffa2c6f1b759a04e997..ed8a4fcd9d92ca631395a233c07095eb983df5fe 100755
--- a/tests/develop-test/fulltest-query.sh
+++ b/tests/develop-test/fulltest-query.sh
@@ -1,2 +1,3 @@
-python3 ./test.py -f 2-query/ts_hidden_column.py
-python3 ./test.py -f 2-query/union-order.py
+python3 ./test.py -f 2-query/ts_hidden_column.py
+python3 ./test.py -f 2-query/union-order.py
+python3 ./test.py -f 2-query/session_two_stage.py
diff --git a/tests/develop-test/session_two_stage.py b/tests/develop-test/session_two_stage.py
new file mode 100644
index 0000000000000000000000000000000000000000..ca17814c8e31a2f7e9aca3712655cb50f6a0f0b8
--- /dev/null
+++ b/tests/develop-test/session_two_stage.py
@@ -0,0 +1,109 @@
+###################################################################
+#           Copyright (c) 2020 by TAOS Technologies, Inc.
+#                     All rights reserved.
+#
+#  This file is proprietary and confidential to TAOS Technologies.
+#  No part of this file may be reproduced, stored, transmitted,
+#  disclosed or used in any form or by any means other than as
+#  expressly provided by the written permission from Jianhui Tao
+#
+###################################################################
+
+# -*- coding: utf-8 -*-
+
+from posixpath import split
+import sys
+import os 
+
+from util.log import *
+from util.cases import *
+from util.sql import *
+from util.dnodes import *
+
+class TDTestCase:
+    def init(self, conn, logSql):
+        tdLog.debug("start to execute %s" % __file__)
+        tdSql.init(conn.cursor(), logSql)
+        
+        self.ts = 1420041600000 # 2015-01-01 00:00:00  this is begin time for first record
+        self.num = 10
+
+    def getBuildPath(self):
+        selfPath = os.path.dirname(os.path.realpath(__file__))
+
+        if ("community" in selfPath):
+            projPath = selfPath[:selfPath.find("community")]
+        else:
+            projPath = selfPath[:selfPath.find("tests")]
+
+        for root, dirs, files in os.walk(projPath):
+            if ("taosd" in files):
+                rootRealPath = os.path.dirname(os.path.realpath(root))
+                if ("packaging" not in rootRealPath):
+                    buildPath = root[:len(root) - len("/build/bin")]
+                    break
+        return buildPath
+
+
+    def caseDescription(self):
+
+        '''
+        case1 <shenglian zhou>: [TD-12344] : fix session window for super table two stage query
+        ''' 
+        return 
+
+    def getBuildPath(self):
+        selfPath = os.path.dirname(os.path.realpath(__file__))
+
+        if ("community" in selfPath):
+            projPath = selfPath[:selfPath.find("community")]
+        else:
+            projPath = selfPath[:selfPath.find("tests")]
+
+        for root, dirs, files in os.walk(projPath):
+            if ("taosd" in files):
+                rootRealPath = os.path.dirname(os.path.realpath(root))
+                if ("packaging" not in rootRealPath):
+                    buildPath = root[:len(root)-len("/build/bin")]
+                    break
+        return buildPath
+
+    def getcfgPath(self):
+        selfPath = os.path.dirname(os.path.realpath(__file__))
+        print(selfPath)
+        if ("community" in selfPath):
+            projPath = selfPath[:selfPath.find("community")]
+        else:
+            projPath = selfPath[:selfPath.find("tests")]
+        
+        cfgPath = projPath + "/sim/dnode1/cfg  "
+        return cfgPath
+
+        
+
+   
+    def run(self):
+        tdSql.prepare()
+        tdSql.execute("create database if not exists testdb keep 36500;")
+        tdSql.execute("use testdb;")
+        tdSql.execute("create stable st (ts timestamp , id int , value double) tags(hostname binary(10) ,ind int);")
+        for i in range(self.num):
+            tdSql.execute("insert into sub_%s using st tags('host_%s' , %d) values (%d , %d , %f );"%(str(i),str(i),i*10,self.ts+10000*i,i*2,i+10.00))
+
+        tdSql.query('select elapsed(ts,10s) from sub_1  where ts>="2015-01-01 00:00:00.000"  and ts < "2015-01-01 00:10:00.000" session(ts,1d) ;')
+
+        cfg_path = self.getcfgPath()
+        print(cfg_path)
+        tdSql.query('select elapsed(ts,10s) from st   where ts>="2015-01-01 00:00:00.000"  and ts < "2015-01-01 00:10:00.000" session(ts,1d) group by tbname;')  # session not support super table
+        tdSql.checkRows(10) 
+         
+    
+
+    def stop(self):
+        tdSql.close()
+        tdLog.success("%s successfully executed" % __file__)
+
+tdCases.addWindows(__file__, TDTestCase())
+tdCases.addLinux(__file__, TDTestCase())
+
+