diff --git a/tests/script/tsim/query/session.sim b/tests/script/tsim/query/session.sim
new file mode 100644
index 0000000000..43923fc572
--- /dev/null
+++ b/tests/script/tsim/query/session.sim
@@ -0,0 +1,229 @@
+#### session windows
+
+system sh/stop_dnodes.sh
+system sh/deploy.sh -n dnode1 -i 1
+system sh/cfg.sh -n dnode1
+system sh/exec.sh -n dnode1 -s start
+
+$loop_cnt = 0
+check_dnode_ready:
+	$loop_cnt = $loop_cnt + 1
+	sleep 200
+	if $loop_cnt == 10 then
+	  print ====> dnode not ready!
+		return -1
+	endi
+sql show dnodes
+print ===> $rows $data00 $data01 $data02 $data03 $data04 $data05
+if $data00 != 1 then
+  return -1
+endi
+if $data04 != ready then
+  goto check_dnode_ready
+endi
+
+sql connect
+
+$vgroups  = 4
+$dbNamme  = d0
+
+print =============== create database $dbNamme vgroups $vgroups
+sql create database $dbNamme vgroups $vgroups
+sql show databases
+print $data00 $data01 $data02 $data03 $data04 $data05 $data06 $data07 $data08 $data09
+print $data10 $data11 $data12 $data13 $data14 $data15 $data16 $data17 $data18 $data19
+#print $data20 $data21 $data22 $data23 $data24 $data25 $data26 $data27 $data28 $data29
+
+sql use $dbNamme
+
+print =============== create super table, child table and insert data
+sql create table if not exists st (ts timestamp, tagtype int) tags(dev nchar(50), tag2 binary(16))
+sql create table if not exists dev_001 using st tags("dev_01", "tag_01")
+sql create table if not exists dev_002 using st tags("dev_02", "tag_02")
+
+sql INSERT INTO dev_001 VALUES('2020-05-13 10:00:00.000', 1)('2020-05-13 10:00:00.005', 2)('2020-05-13 10:00:00.011', 3)
+sql INSERT INTO dev_001 VALUES('2020-05-13 10:00:01.011', 4)('2020-05-13 10:00:01.611', 5)('2020-05-13 10:00:02.612', 6)
+sql INSERT INTO dev_001 VALUES('2020-05-13 10:01:02.612', 7)('2020-05-13 10:02:02.612', 8)('2020-05-13 10:03:02.613', 9)
+sql INSERT INTO dev_001 VALUES('2020-05-13 11:00:00.000', 10)('2020-05-13 12:00:00.000', 11)('2020-05-13 13:00:00.001', 12)
+sql INSERT INTO dev_001 VALUES('2020-05-14 13:00:00.001', 13)('2020-05-15 14:00:00.000', 14)('2020-05-20 10:00:00.000', 15)
+sql INSERT INTO dev_001 VALUES('2020-05-27 10:00:00.001', 16) 
+           
+sql INSERT INTO dev_002 VALUES('2020-05-13 10:00:00.000', 1)('2020-05-13 10:00:00.005', 2)('2020-05-13 10:00:00.009', 3)
+sql INSERT INTO dev_002 VALUES('2020-05-13 10:00:00.0021', 4)('2020-05-13 10:00:00.031', 5)('2020-05-13 10:00:00.036', 6)('2020-05-13 10:00:00.51', 7)
+
+
+
+# session(ts,5a)
+print ====> select count(*) from dev_001 session(ts,5a)
+sql select count(*) from dev_001 session(ts,5a)
+print ====> rows: $rows
+print ====> $data00 $data01 $data02 $data03 $data04 $data05
+print ====> $data10 $data11 $data12 $data13 $data14 $data15
+print ====> $data20 $data21 $data22 $data23 $data24 $data25
+print ====> $data30 $data31 $data32 $data33 $data34 $data35
+print ====> $data40 $data41 $data42 $data43 $data44 $data45
+print ====> $data50 $data51 $data52 $data53 $data54 $data55
+print ====> $data60 $data61 $data62 $data63 $data64 $data65
+print ====> $data70 $data71 $data72 $data73 $data74 $data75
+print ====> $data80 $data81 $data82 $data83 $data84 $data85
+print ====> $data90 $data91 $data92 $data93 $data94 $data95
+if $rows != 15 then
+  return -1
+endi
+if $data01 != 2 then
+  return -1
+endi
+
+return
+
+#
+#        # session(ts,5a) main query
+#        tdSql.query("select count(*) from (select * from dev_001) session(ts,5a)")
+#        tdSql.checkRows(15)
+#        tdSql.checkData(0, 1, 2)
+#
+#
+#        # session(ts,1s)
+#        tdSql.query("select count(*) from dev_001 session(ts,1s)")
+#        tdSql.checkRows(12)
+#        tdSql.checkData(0, 1, 5)
+#
+#        # session(ts,1s) main query
+#        tdSql.query("select count(*) from (select * from dev_001) session(ts,1s)")
+#        tdSql.checkRows(12)
+#        tdSql.checkData(0, 1, 5)
+#
+#        tdSql.query("select count(*) from dev_001 session(ts,1000a)")
+#        tdSql.checkRows(12)
+#        tdSql.checkData(0, 1, 5)
+#
+#        tdSql.query("select count(*) from  (select * from dev_001) session(ts,1000a)")
+#        tdSql.checkRows(12)
+#        tdSql.checkData(0, 1, 5)
+#
+#        # session(ts,1m)
+#        tdSql.query("select count(*) from dev_001 session(ts,1m)")
+#        tdSql.checkRows(9)
+#        tdSql.checkData(0, 1, 8)
+#
+#        # session(ts,1m)
+#        tdSql.query("select count(*) from (select * from dev_001) session(ts,1m)")
+#        tdSql.checkRows(9)
+#        tdSql.checkData(0, 1, 8)
+#
+#        # session(ts,1h)
+#        tdSql.query("select count(*) from dev_001 session(ts,1h)")
+#        tdSql.checkRows(6)
+#        tdSql.checkData(0, 1, 11)
+#
+#        # session(ts,1h)
+#        tdSql.query("select count(*) from (select * from dev_001) session(ts,1h)")
+#        tdSql.checkRows(6)
+#        tdSql.checkData(0, 1, 11)
+#
+#        # session(ts,1d)
+#        tdSql.query("select count(*) from dev_001 session(ts,1d)")
+#        tdSql.checkRows(4)
+#        tdSql.checkData(0, 1, 13)
+#
+#        # session(ts,1d)
+#        tdSql.query("select count(*) from (select * from dev_001) session(ts,1d)")
+#        tdSql.checkRows(4)
+#        tdSql.checkData(0, 1, 13)
+#
+#        # session(ts,1w)
+#        tdSql.query("select count(*) from dev_001 session(ts,1w)")
+#        tdSql.checkRows(2)
+#        tdSql.checkData(0, 1, 15)
+#
+#        # session(ts,1w)
+#        tdSql.query("select count(*) from (select * from dev_001) session(ts,1w)")
+#        tdSql.checkRows(2)
+#        tdSql.checkData(0, 1, 15)
+#
+#        # session with where 
+#        tdSql.query("select count(*),first(tagtype),last(tagtype),avg(tagtype),sum(tagtype),min(tagtype),max(tagtype),leastsquares(tagtype, 1, 1),spread(tagtype),stddev(tagtype),percentile(tagtype,0)  from dev_001 where ts <'2020-05-20 0:0:0' session(ts,1d)")
+#
+#        tdSql.checkRows(2)
+#        tdSql.checkData(0, 1, 13)
+#        tdSql.checkData(0, 2, 1)
+#        tdSql.checkData(0, 3, 13)
+#        tdSql.checkData(0, 4, 7)
+#        tdSql.checkData(0, 5, 91)
+#        tdSql.checkData(0, 6, 1)
+#        tdSql.checkData(0, 7, 13)
+#        tdSql.checkData(0, 8, '{slop:1.000000, intercept:0.000000}')
+#        tdSql.checkData(0, 9, 12)
+#        tdSql.checkData(0, 10, 3.741657387)
+#        tdSql.checkData(0, 11, 1)
+#        tdSql.checkData(1, 11, 14)
+#
+#        # session with where main
+#
+#        tdSql.query("select count(*),first(tagtype),last(tagtype),avg(tagtype),sum(tagtype),min(tagtype),max(tagtype),leastsquares(tagtype, 1, 1) from (select * from dev_001 where ts <'2020-05-20 0:0:0') session(ts,1d)")
+#
+#        tdSql.checkRows(2)
+#        tdSql.checkData(0, 1, 13)
+#        tdSql.checkData(0, 2, 1)
+#        tdSql.checkData(0, 3, 13)
+#        tdSql.checkData(0, 4, 7)
+#        tdSql.checkData(0, 5, 91)
+#        tdSql.checkData(0, 6, 1)
+#        tdSql.checkData(0, 7, 13)
+#        tdSql.checkData(0, 8, '{slop:1.000000, intercept:0.000000}')
+#
+#        # tdsql err
+#        tdSql.error("select * from dev_001 session(ts,1w)")
+#        tdSql.error("select count(*) from st session(ts,1w)")
+#        tdSql.error("select count(*) from dev_001 group by tagtype session(ts,1w) ")
+#        tdSql.error("select count(*) from dev_001 session(ts,1n)")
+#        tdSql.error("select count(*) from dev_001 session(ts,1y)")
+#        tdSql.error("select count(*) from dev_001 session(ts,0s)")
+#        tdSql.error("select count(*) from dev_001 session(i,1y)")
+#        tdSql.error("select count(*) from dev_001 session(ts,1d) where ts <'2020-05-20 0:0:0'")
+#
+#        #test precision us 
+#        tdSql.execute("create database test precision 'us'")
+#        tdSql.execute("use test")
+#        tdSql.execute("create table dev_001 (ts timestamp ,i timestamp ,j int)")
+#        tdSql.execute("insert into dev_001 values(1623046993681000,now,1)(1623046993681001,now+1s,2)(1623046993681002,now+2s,3)(1623046993681004,now+5s,4)")
+#
+#        # session(ts,1u)
+#        tdSql.query("select count(*) from dev_001 session(ts,1u)")
+#        tdSql.checkRows(2)
+#        tdSql.checkData(0, 1, 3)
+#        tdSql.error("select count(*) from dev_001 session(i,1s)")
+#        # test second timestamp fileds
+#        tdSql.execute("create table secondts(ts timestamp,t2 timestamp,i int)")
+#        tdSql.error("select count(*) from secondts session(t2,2s)")
+#
+#
+
+
+#if $loop_test == 0 then
+#  print =============== stop and restart taosd
+#  system sh/exec.sh -n dnode1 -s stop -x SIGINT
+#  system sh/exec.sh -n dnode1 -s start
+#  
+#  $loop_cnt = 0
+#  check_dnode_ready_0:
+#  	$loop_cnt = $loop_cnt + 1
+#  	sleep 200
+#  	if $loop_cnt == 10 then
+#  	  print ====> dnode not ready!
+#  		return -1
+#  	endi
+#  sql show dnodes
+#  print ===> $rows $data00 $data01 $data02 $data03 $data04 $data05
+#  if $data00 != 1 then
+#    return -1
+#  endi
+#  if $data04 != ready then
+#    goto check_dnode_ready_0
+#  endi
+#
+#  $loop_test = 1  
+#  goto loop_test_pos
+#endi
+#
+#system sh/exec.sh -n dnode1 -s stop -x SIGINT