diff --git a/tests/pytest/fulltest.sh b/tests/pytest/fulltest.sh
index 146c47c51da1a3eb9e3277417e76eb97053159a9..b9b7bbcaf6bd056329ae04b0b2fb91ff56f3ce45 100755
--- a/tests/pytest/fulltest.sh
+++ b/tests/pytest/fulltest.sh
@@ -25,6 +25,8 @@ python3 ./test.py -f insert/special_character_show.py
 python3 bug2265.py
 python3 ./test.py -f insert/bug3654.py
 python3 ./test.py -f insert/insertDynamicColBeforeVal.py
+python3 ./test.py -f insert/in_function.py
+python3 ./test.py -f insert/modify_column.py
 
 #table
 python3 ./test.py -f table/alter_wal0.py
diff --git a/tests/pytest/insert/in_function.py b/tests/pytest/insert/in_function.py
new file mode 100644
index 0000000000000000000000000000000000000000..d1fbfd702a857ab6d966aff46e04a32ac933c384
--- /dev/null
+++ b/tests/pytest/insert/in_function.py
@@ -0,0 +1,726 @@
+###################################################################
+#           Copyright (c) 2016 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 -*-
+
+import sys
+import datetime
+
+from util.log import *
+from util.cases import *
+from util.sql import *
+
+
+class TDTestCase:
+    def init(self, conn, logSql):
+        tdLog.debug("start to execute %s" % __file__)
+        tdSql.init(conn.cursor(), logSql)
+
+    def run(self):
+        tdSql.prepare()
+        # test case for https://jira.taosdata.com:18080/browse/TD-4568
+
+        tdLog.info("=============== step1,check bool and tinyint data type")    
+
+        tdLog.info("=============== step1.1,drop table && create table")    
+        cmd1 = 'drop table if exists in_bool_tinyint_1 ;'
+        cmd2 = 'drop table if exists in_bool_tinyint_2 ;'
+        cmd3 = 'drop table if exists in_bool_tinyint_3 ;'
+        cmd10 = 'drop table if exists in_stable_1 ;'
+        cmd11 = 'create stable in_stable_1(ts timestamp,in_bool bool,in_tinyint tinyint) tags (tin_bool bool,tin_tinyint tinyint) ;'
+        cmd12 = 'create table in_bool_tinyint_1 using in_stable_1 tags(\'true\',\'127\') ; '
+        cmd13 = 'create table in_bool_tinyint_2 using in_stable_1 tags(\'false\',\'-127\') ; '
+        cmd14 = 'create table in_bool_tinyint_3 using in_stable_1 tags(\'false\',\'0\') ; '
+        tdLog.info(cmd1)
+        tdSql.execute(cmd1)
+        tdLog.info(cmd2)
+        tdSql.execute(cmd2)
+        tdLog.info(cmd3)
+        tdSql.execute(cmd3)
+        tdLog.info(cmd10)
+        tdSql.execute(cmd10)        
+        tdLog.info(cmd11)
+        tdSql.execute(cmd11)
+        tdLog.info(cmd12)
+        tdSql.execute(cmd12)
+        tdLog.info(cmd13)
+        tdSql.execute(cmd13)
+        tdLog.info(cmd14)
+        tdSql.execute(cmd14)        
+
+        tdLog.info("=============== step1.2,insert stable right data and check in function") 
+        cmd1 = 'insert into in_bool_tinyint_1 values(now,\'true\',\'-127\') ;'
+        tdLog.info(cmd1)
+        tdSql.execute(cmd1)         
+        tdSql.query('select * from in_stable_1 where in_bool in (true) order by ts desc')
+        tdSql.checkData(0,1,'True') 
+        tdSql.checkData(0,2,'-127')
+        tdSql.checkData(0,3,'True') 
+        tdSql.checkData(0,4,'127')  
+        tdSql.query('select * from in_stable_1 where in_tinyint in (-127) order by ts desc')
+        tdSql.checkData(0,1,'True') 
+        tdSql.checkData(0,2,'-127')
+        tdSql.checkData(0,3,'True') 
+        tdSql.checkData(0,4,'127')     
+        tdSql.query('select * from in_stable_1 where tin_bool in (true) order by ts desc')
+        tdSql.checkData(0,1,'True') 
+        tdSql.checkData(0,2,'-127')
+        tdSql.checkData(0,3,'True') 
+        tdSql.checkData(0,4,'127')  
+        tdSql.query('select * from in_stable_1 where tin_tinyint in (127) order by ts desc')
+        tdSql.checkData(0,1,'True') 
+        tdSql.checkData(0,2,'-127')
+        tdSql.checkData(0,3,'True') 
+        tdSql.checkData(0,4,'127')  
+        tdSql.query('select * from in_bool_tinyint_1 where in_bool in (true) order by ts desc')
+        tdSql.checkData(0,1,'True') 
+        tdSql.checkData(0,2,'-127')
+        tdSql.query('select * from in_bool_tinyint_1 where in_tinyint in (-127) order by ts desc')
+        tdSql.checkData(0,1,'True') 
+        tdSql.checkData(0,2,'-127')                
+
+        cmd2 = 'insert into in_bool_tinyint_2 values(now,\'false\',\'127\') ;'
+        tdLog.info(cmd2)
+        tdSql.execute(cmd2)         
+        tdSql.query('select * from in_stable_1 where in_bool in (false) order by ts desc')
+        tdSql.checkData(0,1,'False') 
+        tdSql.checkData(0,2,'127')
+        tdSql.checkData(0,3,'False') 
+        tdSql.checkData(0,4,'-127') 
+        tdSql.query('select * from in_stable_1 where in_tinyint in (127) order by ts desc')
+        tdSql.checkData(0,1,'False') 
+        tdSql.checkData(0,2,'127')
+        tdSql.checkData(0,3,'False') 
+        tdSql.checkData(0,4,'-127')   
+        tdSql.query('select * from in_stable_1 where tin_bool in (false) order by ts desc')
+        tdSql.checkData(0,1,'False') 
+        tdSql.checkData(0,2,'127')
+        tdSql.checkData(0,3,'False') 
+        tdSql.checkData(0,4,'-127') 
+        tdSql.query('select * from in_stable_1 where tin_tinyint in (-127) order by ts desc')
+        tdSql.checkData(0,1,'False') 
+        tdSql.checkData(0,2,'127')
+        tdSql.checkData(0,3,'False') 
+        tdSql.checkData(0,4,'-127') 
+        tdSql.query('select * from in_bool_tinyint_2 where in_bool in (false) order by ts desc')
+        tdSql.checkData(0,1,'False') 
+        tdSql.checkData(0,2,'127')
+        tdSql.query('select * from in_bool_tinyint_2 where in_tinyint in (127) order by ts desc')
+        tdSql.checkData(0,1,'False') 
+        tdSql.checkData(0,2,'127')         
+
+        cmd3 = 'insert into in_bool_tinyint_3 values(now,\'true\',\'0\') ;'
+        tdLog.info(cmd3)
+        tdSql.execute(cmd3)         
+        tdSql.query('select * from in_stable_1 where in_tinyint in (0) order by ts desc')
+        tdSql.checkData(0,1,'True') 
+        tdSql.checkData(0,2,'0')
+        tdSql.checkData(0,3,'False') 
+        tdSql.checkData(0,4,'0')  
+        tdSql.query('select * from in_stable_1 where tin_tinyint in (0) order by ts desc')
+        tdSql.checkData(0,1,'True') 
+        tdSql.checkData(0,2,'0')
+        tdSql.checkData(0,3,'False') 
+        tdSql.checkData(0,4,'0')  
+        tdSql.query('select * from in_bool_tinyint_3 where in_bool in (true) order by ts desc')
+        tdSql.checkData(0,1,'True') 
+        tdSql.checkData(0,2,'0')
+        tdSql.query('select * from in_bool_tinyint_3 where in_tinyint in (0) order by ts desc')
+        tdSql.checkData(0,1,'True') 
+        tdSql.checkData(0,2,'0')
+
+
+        tdLog.info("=============== step1.3,drop normal table && create table") 
+        cmd1 = 'drop table if exists normal_in_bool_tinyint_1 ;'
+        cmd2 = 'create table normal_in_bool_tinyint_1 (ts timestamp,in_bool bool,in_tinyint tinyint) ; '
+        tdLog.info(cmd1)
+        tdSql.execute(cmd1)
+        tdLog.info(cmd2)
+        tdSql.execute(cmd2)
+      
+
+        tdLog.info("=============== step1.4,insert normal table right data and check in function") 
+        cmd1 = 'insert into normal_in_bool_tinyint_1 values(now,\'true\',\'-127\') ;'
+        tdLog.info(cmd1)
+        tdSql.execute(cmd1)         
+        tdSql.query('select * from normal_in_bool_tinyint_1 where in_bool in (true) order by ts desc')
+        tdSql.checkData(0,1,'True') 
+        tdSql.checkData(0,2,'-127')         
+        tdSql.query('select * from normal_in_bool_tinyint_1 where in_tinyint in (-127) order by ts desc')
+        tdSql.checkData(0,1,'True') 
+        tdSql.checkData(0,2,'-127')  
+
+        cmd2 = 'insert into normal_in_bool_tinyint_1 values(now,\'false\',\'127\') ;'
+        tdLog.info(cmd2)
+        tdSql.execute(cmd2)         
+        tdSql.query('select * from normal_in_bool_tinyint_1 where in_bool in (false) order by ts desc')
+        tdSql.checkData(0,1,'False') 
+        tdSql.checkData(0,2,'127') 
+        tdSql.query('select * from normal_in_bool_tinyint_1 where in_tinyint in (127) order by ts desc')
+        tdSql.checkData(0,1,'False') 
+        tdSql.checkData(0,2,'127')        
+
+        cmd3 = 'insert into normal_in_bool_tinyint_1 values(now,\'true\',\'0\') ;'
+        tdLog.info(cmd3)
+        tdSql.execute(cmd3)         
+        tdSql.query('select * from normal_in_bool_tinyint_1 where in_tinyint in (0) order by ts desc')
+        tdSql.checkData(0,1,'True') 
+        tdSql.checkData(0,2,'0')
+
+
+ 
+        tdLog.info("=============== step2,check int、smallint and bigint data type")  
+
+        tdLog.info("=============== step2.1,drop table && create table")    
+        cmd1 = 'drop table if exists in_int_smallint_bigint_1 ;'
+        cmd2 = 'drop table if exists in_int_smallint_bigint_2 ;'
+        cmd3 = 'drop table if exists in_int_smallint_bigint_3 ;'
+        cmd10 = 'drop table if exists in_stable_2 ;'
+        cmd11 = 'create stable in_stable_2(ts timestamp,in_int int,in_small smallint , in_big bigint) tags (tin_int int,tin_small smallint , tin_big bigint) ;'
+        cmd12 = 'create table in_int_smallint_bigint_1 using in_stable_2 tags(\'2147483647\',\'-32767\',\'0\') ; '
+        cmd13 = 'create table in_int_smallint_bigint_2 using in_stable_2 tags(\'-2147483647\',\'0\',\'9223372036854775807\') ; '
+        cmd14 = 'create table in_int_smallint_bigint_3 using in_stable_2 tags(\'0\',\'32767\',\'-9223372036854775807\') ; '
+        tdLog.info(cmd1)
+        tdSql.execute(cmd1)
+        tdLog.info(cmd2)
+        tdSql.execute(cmd2)
+        tdLog.info(cmd3)
+        tdSql.execute(cmd3)
+        tdLog.info(cmd10)
+        tdSql.execute(cmd10)        
+        tdLog.info(cmd11)
+        tdSql.execute(cmd11)
+        tdLog.info(cmd12)
+        tdSql.execute(cmd12)
+        tdLog.info(cmd13)
+        tdSql.execute(cmd13)
+        tdLog.info(cmd14)
+        tdSql.execute(cmd14)        
+
+        tdLog.info("=============== step2.2,insert stable right data and check in function") 
+        cmd1 = 'insert into in_int_smallint_bigint_1 values(now,\'2147483647\',\'-32767\',\'0\') ;'
+        tdLog.info(cmd1)
+        tdSql.execute(cmd1)         
+        tdSql.query('select * from in_stable_2 where in_int in (2147483647) order by ts desc')
+        tdSql.checkData(0,1,'2147483647') 
+        tdSql.checkData(0,2,'-32767')
+        tdSql.checkData(0,3,'0') 
+        tdSql.checkData(0,4,'2147483647')  
+        tdSql.checkData(0,5,'-32767') 
+        tdSql.checkData(0,6,'0')  
+        tdSql.query('select * from in_stable_2 where in_small in (-32767) order by ts desc')
+        tdSql.checkData(0,1,'2147483647') 
+        tdSql.checkData(0,2,'-32767')
+        tdSql.checkData(0,3,'0') 
+        tdSql.checkData(0,4,'2147483647')  
+        tdSql.checkData(0,5,'-32767') 
+        tdSql.checkData(0,6,'0')    
+        tdSql.query('select * from in_stable_2 where in_big in (0) order by ts desc')
+        tdSql.checkData(0,1,'2147483647') 
+        tdSql.checkData(0,2,'-32767')
+        tdSql.checkData(0,3,'0') 
+        tdSql.checkData(0,4,'2147483647')  
+        tdSql.checkData(0,5,'-32767') 
+        tdSql.checkData(0,6,'0')  
+        tdSql.query('select * from in_stable_2 where tin_int in (2147483647) order by ts desc')
+        tdSql.checkData(0,1,'2147483647') 
+        tdSql.checkData(0,2,'-32767')
+        tdSql.checkData(0,3,'0') 
+        tdSql.checkData(0,4,'2147483647')  
+        tdSql.checkData(0,5,'-32767') 
+        tdSql.checkData(0,6,'0')  
+        tdSql.query('select * from in_stable_2 where tin_small in (-32767) order by ts desc')
+        tdSql.checkData(0,1,'2147483647') 
+        tdSql.checkData(0,2,'-32767')
+        tdSql.checkData(0,3,'0') 
+        tdSql.checkData(0,4,'2147483647')  
+        tdSql.checkData(0,5,'-32767') 
+        tdSql.checkData(0,6,'0')    
+        tdSql.query('select * from in_stable_2 where tin_big in (0) order by ts desc')
+        tdSql.checkData(0,1,'2147483647') 
+        tdSql.checkData(0,2,'-32767')
+        tdSql.checkData(0,3,'0') 
+        tdSql.checkData(0,4,'2147483647')  
+        tdSql.checkData(0,5,'-32767') 
+        tdSql.checkData(0,6,'0')     
+        tdSql.query('select * from in_int_smallint_bigint_1 where in_int in (2147483647) order by ts desc')
+        tdSql.checkData(0,1,'2147483647') 
+        tdSql.checkData(0,2,'-32767')
+        tdSql.checkData(0,3,'0') 
+        tdSql.query('select * from in_int_smallint_bigint_1 where in_small in (-32767) order by ts desc')
+        tdSql.checkData(0,1,'2147483647') 
+        tdSql.checkData(0,2,'-32767')
+        tdSql.checkData(0,3,'0')  
+        tdSql.query('select * from in_int_smallint_bigint_1 where in_big in (0) order by ts desc')
+        tdSql.checkData(0,1,'2147483647') 
+        tdSql.checkData(0,2,'-32767')
+        tdSql.checkData(0,3,'0')      
+
+        cmd2 = 'insert into in_int_smallint_bigint_2 values(now,\'-2147483647\',\'0\',\'9223372036854775807\') ;'
+        tdLog.info(cmd2)
+        tdSql.execute(cmd2)         
+        tdSql.query('select * from in_stable_2 where in_int in (-2147483647) order by ts desc')
+        tdSql.checkData(0,1,'-2147483647') 
+        tdSql.checkData(0,2,'0')
+        tdSql.checkData(0,3,'9223372036854775807') 
+        tdSql.checkData(0,4,'-2147483647')  
+        tdSql.checkData(0,5,'0') 
+        tdSql.checkData(0,6,'9223372036854775807')  
+        tdSql.query('select * from in_stable_2 where in_small in (0) order by ts desc')
+        tdSql.checkData(0,1,'-2147483647') 
+        tdSql.checkData(0,2,'0')
+        tdSql.checkData(0,3,'9223372036854775807') 
+        tdSql.checkData(0,4,'-2147483647')  
+        tdSql.checkData(0,5,'0') 
+        tdSql.checkData(0,6,'9223372036854775807')     
+        tdSql.query('select * from in_stable_2 where in_big in (9223372036854775807) order by ts desc')
+        tdSql.checkData(0,1,'-2147483647') 
+        tdSql.checkData(0,2,'0')
+        tdSql.checkData(0,3,'9223372036854775807') 
+        tdSql.checkData(0,4,'-2147483647')  
+        tdSql.checkData(0,5,'0') 
+        tdSql.checkData(0,6,'9223372036854775807')    
+        tdSql.query('select * from in_stable_2 where tin_int in (-2147483647) order by ts desc')
+        tdSql.checkData(0,1,'-2147483647') 
+        tdSql.checkData(0,2,'0')
+        tdSql.checkData(0,3,'9223372036854775807') 
+        tdSql.checkData(0,4,'-2147483647')  
+        tdSql.checkData(0,5,'0') 
+        tdSql.checkData(0,6,'9223372036854775807') 
+        tdSql.query('select * from in_stable_2 where tin_small in (0) order by ts desc')
+        tdSql.checkData(0,1,'-2147483647') 
+        tdSql.checkData(0,2,'0')
+        tdSql.checkData(0,3,'9223372036854775807') 
+        tdSql.checkData(0,4,'-2147483647')  
+        tdSql.checkData(0,5,'0') 
+        tdSql.checkData(0,6,'9223372036854775807')   
+        tdSql.query('select * from in_stable_2 where tin_big in (9223372036854775807) order by ts desc')
+        tdSql.checkData(0,1,'-2147483647') 
+        tdSql.checkData(0,2,'0')
+        tdSql.checkData(0,3,'9223372036854775807') 
+        tdSql.checkData(0,4,'-2147483647')  
+        tdSql.checkData(0,5,'0') 
+        tdSql.checkData(0,6,'9223372036854775807')  
+        tdSql.query('select * from in_int_smallint_bigint_2 where in_int in (-2147483647) order by ts desc')
+        tdSql.checkData(0,1,'-2147483647') 
+        tdSql.checkData(0,2,'0')
+        tdSql.checkData(0,3,'9223372036854775807')  
+        tdSql.query('select * from in_int_smallint_bigint_2 where in_small in (0) order by ts desc')
+        tdSql.checkData(0,1,'-2147483647') 
+        tdSql.checkData(0,2,'0')
+        tdSql.checkData(0,3,'9223372036854775807')     
+        tdSql.query('select * from in_int_smallint_bigint_2 where in_big in (9223372036854775807) order by ts desc')
+        tdSql.checkData(0,1,'-2147483647') 
+        tdSql.checkData(0,2,'0')
+        tdSql.checkData(0,3,'9223372036854775807')             
+
+        cmd3 = 'insert into in_int_smallint_bigint_3 values(now,\'0\',\'32767\',\'-9223372036854775807\') ;'
+        tdLog.info(cmd3)
+        tdSql.execute(cmd3)         
+        tdSql.query('select * from in_stable_2 where in_int in (0) order by ts desc')
+        tdSql.checkData(0,1,'0') 
+        tdSql.checkData(0,2,'32767')
+        tdSql.checkData(0,3,'-9223372036854775807') 
+        tdSql.checkData(0,4,'0')  
+        tdSql.checkData(0,5,'32767') 
+        tdSql.checkData(0,6,'-9223372036854775807')  
+        tdSql.query('select * from in_stable_2 where in_small in (32767) order by ts desc')
+        tdSql.checkData(0,1,'0') 
+        tdSql.checkData(0,2,'32767')
+        tdSql.checkData(0,3,'-9223372036854775807') 
+        tdSql.checkData(0,4,'0')  
+        tdSql.checkData(0,5,'32767') 
+        tdSql.checkData(0,6,'-9223372036854775807')    
+        tdSql.query('select * from in_stable_2 where in_big in (-9223372036854775807) order by ts desc')
+        tdSql.checkData(0,1,'0') 
+        tdSql.checkData(0,2,'32767')
+        tdSql.checkData(0,3,'-9223372036854775807') 
+        tdSql.checkData(0,4,'0')  
+        tdSql.checkData(0,5,'32767') 
+        tdSql.checkData(0,6,'-9223372036854775807')    
+        tdSql.query('select * from in_stable_2 where tin_int in (0) order by ts desc')
+        tdSql.checkData(0,1,'0') 
+        tdSql.checkData(0,2,'32767')
+        tdSql.checkData(0,3,'-9223372036854775807') 
+        tdSql.checkData(0,4,'0')  
+        tdSql.checkData(0,5,'32767') 
+        tdSql.checkData(0,6,'-9223372036854775807')  
+        tdSql.query('select * from in_stable_2 where tin_small in (32767) order by ts desc')
+        tdSql.checkData(0,1,'0') 
+        tdSql.checkData(0,2,'32767')
+        tdSql.checkData(0,3,'-9223372036854775807') 
+        tdSql.checkData(0,4,'0')  
+        tdSql.checkData(0,5,'32767') 
+        tdSql.checkData(0,6,'-9223372036854775807')    
+        tdSql.query('select * from in_stable_2 where tin_big in (-9223372036854775807) order by ts desc')
+        tdSql.checkData(0,1,'0') 
+        tdSql.checkData(0,2,'32767')
+        tdSql.checkData(0,3,'-9223372036854775807') 
+        tdSql.checkData(0,4,'0')  
+        tdSql.checkData(0,5,'32767') 
+        tdSql.checkData(0,6,'-9223372036854775807')  
+        tdSql.query('select * from in_int_smallint_bigint_3 where in_int in (0) order by ts desc')
+        tdSql.checkData(0,1,'0') 
+        tdSql.checkData(0,2,'32767')
+        tdSql.checkData(0,3,'-9223372036854775807') 
+        tdSql.query('select * from in_int_smallint_bigint_3 where in_small in (32767) order by ts desc')
+        tdSql.checkData(0,1,'0') 
+        tdSql.checkData(0,2,'32767')
+        tdSql.checkData(0,3,'-9223372036854775807')   
+        tdSql.query('select * from in_int_smallint_bigint_3 where in_big in (-9223372036854775807) order by ts desc')
+        tdSql.checkData(0,1,'0') 
+        tdSql.checkData(0,2,'32767')
+        tdSql.checkData(0,3,'-9223372036854775807')       
+
+
+        tdLog.info("=============== step2.3,drop normal table && create table") 
+        cmd1 = 'drop table if exists normal_int_smallint_bigint_1 ;'
+        cmd2 = 'create table normal_int_smallint_bigint_1 (ts timestamp,in_int int,in_small smallint , in_big bigint) ; '
+        tdLog.info(cmd1)
+        tdSql.execute(cmd1)
+        tdLog.info(cmd2)
+        tdSql.execute(cmd2)
+      
+
+        tdLog.info("=============== step2.4,insert normal table right data and check in function") 
+        cmd1 = 'insert into normal_int_smallint_bigint_1 values(now,\'2147483647\',\'-32767\',\'0\') ;'
+        tdLog.info(cmd1)
+        tdSql.execute(cmd1)         
+        tdSql.query('select * from normal_int_smallint_bigint_1 where in_int in (2147483647) order by ts desc')
+        tdSql.checkData(0,1,'2147483647') 
+        tdSql.checkData(0,2,'-32767')
+        tdSql.checkData(0,3,'0')             
+        tdSql.query('select * from normal_int_smallint_bigint_1 where in_small in (-32767) order by ts desc')
+        tdSql.checkData(0,1,'2147483647') 
+        tdSql.checkData(0,2,'-32767')
+        tdSql.checkData(0,3,'0')  
+        tdSql.query('select * from normal_int_smallint_bigint_1 where in_big in (0) order by ts desc')
+        tdSql.checkData(0,1,'2147483647') 
+        tdSql.checkData(0,2,'-32767')
+        tdSql.checkData(0,3,'0')        
+
+        cmd2 = 'insert into normal_int_smallint_bigint_1 values(now,\'-2147483647\',\'0\',\'9223372036854775807\') ;'
+        tdLog.info(cmd2)
+        tdSql.execute(cmd2)         
+        tdSql.query('select * from normal_int_smallint_bigint_1 where in_int in (-2147483647) order by ts desc')
+        tdSql.checkData(0,1,'-2147483647') 
+        tdSql.checkData(0,2,'0')
+        tdSql.checkData(0,3,'9223372036854775807')             
+        tdSql.query('select * from normal_int_smallint_bigint_1 where in_small in (0) order by ts desc')
+        tdSql.checkData(0,1,'-2147483647') 
+        tdSql.checkData(0,2,'0')
+        tdSql.checkData(0,3,'9223372036854775807')  
+        tdSql.query('select * from normal_int_smallint_bigint_1 where in_big in (9223372036854775807) order by ts desc')
+        tdSql.checkData(0,1,'-2147483647') 
+        tdSql.checkData(0,2,'0')
+        tdSql.checkData(0,3,'9223372036854775807')          
+
+        cmd3 = 'insert into normal_int_smallint_bigint_1 values(now,\'0\',\'32767\',\'-9223372036854775807\') ;'
+        tdLog.info(cmd3)
+        tdSql.execute(cmd3)         
+        tdSql.query('select * from normal_int_smallint_bigint_1 where in_int in (0) order by ts desc')
+        tdSql.checkData(0,1,'0') 
+        tdSql.checkData(0,2,'32767')
+        tdSql.checkData(0,3,'-9223372036854775807')             
+        tdSql.query('select * from normal_int_smallint_bigint_1 where in_small in (32767) order by ts desc')
+        tdSql.checkData(0,1,'0') 
+        tdSql.checkData(0,2,'32767')
+        tdSql.checkData(0,3,'-9223372036854775807')  
+        tdSql.query('select * from normal_int_smallint_bigint_1 where in_big in (-9223372036854775807) order by ts desc')
+        tdSql.checkData(0,1,'0') 
+        tdSql.checkData(0,2,'32767')
+        tdSql.checkData(0,3,'-9223372036854775807')   
+
+         
+        tdLog.info("=============== step3,check binary and nchar data type")    
+
+        tdLog.info("=============== step3.1,drop table && create table")    
+        cmd1 = 'drop table if exists in_binary_nchar_1 ;'
+        cmd2 = 'drop table if exists in_binary_nchar_2 ;'
+        cmd3 = 'drop table if exists in_binary_nchar_3 ;'
+        cmd10 = 'drop table if exists in_stable_3 ;'
+        cmd11 = 'create stable in_stable_3(ts timestamp,in_binary binary(8),in_nchar nchar(12)) tags (tin_binary binary(16),tin_nchar nchar(20)) ;'
+        cmd12 = 'create table in_binary_nchar_1 using in_stable_3 tags(\'0\',\'0\') ; '
+        cmd13 = 'create table in_binary_nchar_2 using in_stable_3 tags(\'TDengine\',\'北京涛思数据科技有限公司\') ; '
+        cmd14 = 'create table in_binary_nchar_3 using in_stable_3 tags(\'taosdataTDengine\',\'北京涛思数据科技有限公司TDengine\') ; '
+        tdLog.info(cmd1)
+        tdSql.execute(cmd1)
+        tdLog.info(cmd2)
+        tdSql.execute(cmd2)
+        tdLog.info(cmd3)
+        tdSql.execute(cmd3)
+        tdLog.info(cmd10)
+        tdSql.execute(cmd10)        
+        tdLog.info(cmd11)
+        tdSql.execute(cmd11)
+        tdLog.info(cmd12)
+        tdSql.execute(cmd12)
+        tdLog.info(cmd13)
+        tdSql.execute(cmd13)
+        tdLog.info(cmd14)
+        tdSql.execute(cmd14)        
+
+        tdLog.info("=============== step3.2,insert stable right data and check in function") 
+        cmd1 = 'insert into in_binary_nchar_1 values(now,\'0\',\'0\') ;'
+        tdLog.info(cmd1)
+        tdSql.execute(cmd1)         
+        tdSql.query('select * from in_stable_3 where in_binary in (\'0\') order by ts desc')
+        tdSql.checkData(0,1,'0') 
+        tdSql.checkData(0,2,'0')
+        tdSql.checkData(0,3,'0') 
+        tdSql.checkData(0,4,'0')  
+        tdSql.query('select * from in_stable_3 where in_nchar in (\'0\') order by ts desc')
+        tdSql.checkData(0,1,'0') 
+        tdSql.checkData(0,2,'0')
+        tdSql.checkData(0,3,'0') 
+        tdSql.checkData(0,4,'0')     
+        tdSql.query('select * from in_stable_3 where tin_binary in (\'0\') order by ts desc')
+        tdSql.checkData(0,1,'0') 
+        tdSql.checkData(0,2,'0')
+        tdSql.checkData(0,3,'0') 
+        tdSql.checkData(0,4,'0')  
+        tdSql.query('select * from in_stable_3 where tin_nchar in (\'0\') order by ts desc')
+        tdSql.checkData(0,1,'0') 
+        tdSql.checkData(0,2,'0')
+        tdSql.checkData(0,3,'0') 
+        tdSql.checkData(0,4,'0') 
+        tdSql.query('select * from in_binary_nchar_1 where in_binary in (\'0\') order by ts desc')
+        tdSql.checkData(0,1,'0') 
+        tdSql.checkData(0,2,'0')  
+        tdSql.query('select * from in_binary_nchar_1 where in_nchar in (\'0\') order by ts desc')
+        tdSql.checkData(0,1,'0') 
+        tdSql.checkData(0,2,'0')        
+
+        cmd2 = 'insert into in_binary_nchar_2 values(now,\'TAOS\',\'涛思数据TAOSdata\') ;'
+        tdLog.info(cmd2)
+        tdSql.execute(cmd2)         
+        tdSql.query('select * from in_stable_3 where in_binary in (\'TAOS\') order by ts desc')
+        tdSql.checkData(0,1,'TAOS') 
+        tdSql.checkData(0,2,'涛思数据TAOSdata')
+        tdSql.checkData(0,3,'TDengine') 
+        tdSql.checkData(0,4,'北京涛思数据科技有限公司')  
+        tdSql.query('select * from in_stable_3 where in_nchar in (\'涛思数据TAOSdata\') order by ts desc')
+        tdSql.checkData(0,1,'TAOS') 
+        tdSql.checkData(0,2,'涛思数据TAOSdata')
+        tdSql.checkData(0,3,'TDengine') 
+        tdSql.checkData(0,4,'北京涛思数据科技有限公司')      
+        tdSql.query('select * from in_stable_3 where tin_binary in (\'TDengine\') order by ts desc')
+        tdSql.checkData(0,1,'TAOS') 
+        tdSql.checkData(0,2,'涛思数据TAOSdata')
+        tdSql.checkData(0,3,'TDengine') 
+        tdSql.checkData(0,4,'北京涛思数据科技有限公司')  
+        tdSql.query('select * from in_stable_3 where tin_nchar in (\'北京涛思数据科技有限公司\') order by ts desc')
+        tdSql.checkData(0,1,'TAOS') 
+        tdSql.checkData(0,2,'涛思数据TAOSdata')
+        tdSql.checkData(0,3,'TDengine') 
+        tdSql.checkData(0,4,'北京涛思数据科技有限公司') 
+        tdSql.query('select * from in_binary_nchar_2 where in_binary in (\'TAOS\') order by ts desc')
+        tdSql.checkData(0,1,'TAOS') 
+        tdSql.checkData(0,2,'涛思数据TAOSdata') 
+        tdSql.query('select * from in_binary_nchar_2 where in_nchar in (\'涛思数据TAOSdata\') order by ts desc')
+        tdSql.checkData(0,1,'TAOS') 
+        tdSql.checkData(0,2,'涛思数据TAOSdata')     
+
+        cmd3 = 'insert into in_binary_nchar_3 values(now,\'TDengine\',\'北京涛思数据科技有限公司\') ;'
+        tdLog.info(cmd3)
+        tdSql.execute(cmd3)         
+        tdSql.query('select * from in_stable_3 where in_binary in (\'TDengine\') order by ts desc')
+        tdSql.checkData(0,1,'TDengine') 
+        tdSql.checkData(0,2,'北京涛思数据科技有限公司')
+        tdSql.checkData(0,3,'taosdataTDengine') 
+        tdSql.checkData(0,4,'北京涛思数据科技有限公司TDengine')  
+        tdSql.query('select * from in_stable_3 where in_nchar in (\'北京涛思数据科技有限公司\') order by ts desc')
+        tdSql.checkData(0,1,'TDengine') 
+        tdSql.checkData(0,2,'北京涛思数据科技有限公司')
+        tdSql.checkData(0,3,'taosdataTDengine') 
+        tdSql.checkData(0,4,'北京涛思数据科技有限公司TDengine')     
+        tdSql.query('select * from in_stable_3 where tin_binary in (\'taosdataTDengine\') order by ts desc')
+        tdSql.checkData(0,1,'TDengine') 
+        tdSql.checkData(0,2,'北京涛思数据科技有限公司')
+        tdSql.checkData(0,3,'taosdataTDengine') 
+        tdSql.checkData(0,4,'北京涛思数据科技有限公司TDengine')   
+        tdSql.query('select * from in_stable_3 where tin_nchar in (\'北京涛思数据科技有限公司TDengine\') order by ts desc')
+        tdSql.checkData(0,1,'TDengine') 
+        tdSql.checkData(0,2,'北京涛思数据科技有限公司')
+        tdSql.checkData(0,3,'taosdataTDengine') 
+        tdSql.checkData(0,4,'北京涛思数据科技有限公司TDengine') 
+        tdSql.query('select * from in_binary_nchar_3 where in_binary in (\'TDengine\') order by ts desc')
+        tdSql.checkData(0,1,'TDengine') 
+        tdSql.checkData(0,2,'北京涛思数据科技有限公司') 
+        tdSql.query('select * from in_binary_nchar_3 where in_nchar in (\'北京涛思数据科技有限公司\') order by ts desc')
+        tdSql.checkData(0,1,'TDengine') 
+        tdSql.checkData(0,2,'北京涛思数据科技有限公司') 
+
+
+        tdLog.info("=============== step3.3,drop normal table && create table") 
+        cmd1 = 'drop table if exists normal_in_binary_nchar_1 ;'
+        cmd2 = 'create table normal_in_binary_nchar_1 (ts timestamp,in_binary binary(8),in_nchar nchar(12)) ; '
+        tdLog.info(cmd1)
+        tdSql.execute(cmd1)
+        tdLog.info(cmd2)
+        tdSql.execute(cmd2)
+      
+
+        tdLog.info("=============== step3.4,insert normal table right data and check in function") 
+        cmd1 = 'insert into normal_in_binary_nchar_1 values(now,\'0\',\'0\') ;'
+        tdLog.info(cmd1)
+        tdSql.execute(cmd1)         
+        tdSql.query('select * from normal_in_binary_nchar_1 where in_binary in (\'0\') order by ts desc')
+        tdSql.checkData(0,1,'0') 
+        tdSql.checkData(0,2,'0')         
+        tdSql.query('select * from normal_in_binary_nchar_1 where in_nchar in (\'0\') order by ts desc')
+        tdSql.checkData(0,1,'0') 
+        tdSql.checkData(0,2,'0')  
+
+        cmd2 = 'insert into normal_in_binary_nchar_1 values(now,\'TAOS\',\'涛思数据TAOSdata\') ;'
+        tdLog.info(cmd2)
+        tdSql.execute(cmd2)         
+        tdSql.query('select * from normal_in_binary_nchar_1 where in_binary in (\'TAOS\') order by ts desc')
+        tdSql.checkData(0,1,'TAOS') 
+        tdSql.checkData(0,2,'涛思数据TAOSdata')         
+        tdSql.query('select * from normal_in_binary_nchar_1 where in_nchar in (\'涛思数据TAOSdata\') order by ts desc')
+        tdSql.checkData(0,1,'TAOS') 
+        tdSql.checkData(0,2,'涛思数据TAOSdata')       
+
+        cmd3 = 'insert into normal_in_binary_nchar_1 values(now,\'TDengine\',\'北京涛思数据科技有限公司\') ;'
+        tdLog.info(cmd3)
+        tdSql.execute(cmd3)         
+        tdSql.query('select * from normal_in_binary_nchar_1 where in_binary in (\'TDengine\') order by ts desc')
+        tdSql.checkData(0,1,'TDengine') 
+        tdSql.checkData(0,2,'北京涛思数据科技有限公司')         
+        tdSql.query('select * from normal_in_binary_nchar_1 where in_nchar in (\'北京涛思数据科技有限公司\') order by ts desc')
+        tdSql.checkData(0,1,'TDengine') 
+        tdSql.checkData(0,2,'北京涛思数据科技有限公司')   
+
+        tdLog.info("=============== step4,check float and double data type,not support")    
+
+        tdLog.info("=============== step4.1,drop table && create table")    
+        cmd1 = 'drop table if exists in_float_double_1 ;'
+        cmd10 = 'drop table if exists in_stable_4 ;'
+        cmd11 = 'create stable in_stable_4(ts timestamp,in_float float,in_double double) tags (tin_float float,tin_double double) ;'
+        cmd12 = 'create table in_float_double_1 using in_stable_4 tags(\'666\',\'88888\') ; '
+        tdLog.info(cmd1)
+        tdSql.execute(cmd1)
+        tdLog.info(cmd10)
+        tdSql.execute(cmd10)        
+        tdLog.info(cmd11)
+        tdSql.execute(cmd11)
+        tdLog.info(cmd12)
+        tdSql.execute(cmd12)    
+
+        tdLog.info("=============== step4.2,insert stable right data and check in function") 
+        cmd1 = 'insert into in_float_double_1 values(now,\'888\',\'66666\') ;'
+        tdLog.info(cmd1)
+        tdSql.execute(cmd1)         
+        
+        cmd2 = 'select * from in_stable_4 where in_float in (\'888\');'
+        tdLog.info(cmd2)
+        tdSql.error(cmd2)
+        try:
+            tdSql.execute(cmd2)
+            tdLog.exit("invalid operation: not supported filter condition")
+        except Exception as e:
+            tdLog.info(repr(e))
+            tdLog.info("invalid operation: not supported filter condition") 
+        
+        cmd3 = 'select * from in_stable_4 where in_double in (\'66666\');'
+        tdLog.info(cmd3)
+        tdSql.error(cmd3)
+        try:
+            tdSql.execute(cmd3)
+            tdLog.exit("invalid operation: not supported filter condition")
+        except Exception as e:
+            tdLog.info(repr(e))
+            tdLog.info("invalid operation: not supported filter condition") 
+
+        cmd4 = 'select * from in_stable_4 where tin_float in (\'666\');'
+        tdLog.info(cmd4)
+        tdSql.error(cmd4)
+        try:
+            tdSql.execute(cmd4)
+            tdLog.exit("invalid operation: not supported filter condition")
+        except Exception as e:
+            tdLog.info(repr(e))
+            tdLog.info("invalid operation: not supported filter condition") 
+        
+        cmd5 = 'select * from in_stable_4 where tin_double in (\'88888\');'
+        tdLog.info(cmd5)
+        tdSql.error(cmd5)
+        try:
+            tdSql.execute(cmd5)
+            tdLog.exit("invalid operation: not supported filter condition")
+        except Exception as e:
+            tdLog.info(repr(e))
+            tdLog.info("invalid operation: not supported filter condition") 
+
+        cmd6 = 'select * from in_float_double_1 where in_float in (\'888\');'
+        tdLog.info(cmd6)
+        tdSql.error(cmd6)
+        try:
+            tdSql.execute(cmd6)
+            tdLog.exit("invalid operation: not supported filter condition")
+        except Exception as e:
+            tdLog.info(repr(e))
+            tdLog.info("invalid operation: not supported filter condition") 
+        
+        cmd7 = 'select * from in_float_double_1 where in_double in (\'66666\');'
+        tdLog.info(cmd7)
+        tdSql.error(cmd7)
+        try:
+            tdSql.execute(cmd7)
+            tdLog.exit("invalid operation: not supported filter condition")
+        except Exception as e:
+            tdLog.info(repr(e))
+            tdLog.info("invalid operation: not supported filter condition") 
+
+              
+
+        tdLog.info("=============== step4.3,drop normal table && create table") 
+        cmd1 = 'drop table if exists normal_in_float_double_1 ;'
+        cmd2 = 'create table normal_in_float_double_1 (ts timestamp,in_float float,in_double double) ; '
+        tdLog.info(cmd1)
+        tdSql.execute(cmd1)
+        tdLog.info(cmd2)
+        tdSql.execute(cmd2)
+      
+
+        tdLog.info("=============== step4.4,insert normal table right data and check in function") 
+        cmd1 = 'insert into normal_in_float_double_1 values(now,\'888\',\'666666\') ;'
+        tdLog.info(cmd1)
+        tdSql.execute(cmd1)   
+
+        cmd2 = 'select * from normal_in_float_double_1 where in_float in (\'888\');'
+        tdLog.info(cmd2)
+        tdSql.error(cmd2)
+        try:
+            tdSql.execute(cmd2)
+            tdLog.exit("invalid operation: not supported filter condition")
+        except Exception as e:
+            tdLog.info(repr(e))
+            tdLog.info("invalid operation: not supported filter condition") 
+        
+        cmd3 = 'select * from normal_in_float_double_1 where in_double in (\'66666\');'
+        tdLog.info(cmd3)
+        tdSql.error(cmd3)
+        try:
+            tdSql.execute(cmd3)
+            tdLog.exit("invalid operation: not supported filter condition")
+        except Exception as e:
+            tdLog.info(repr(e))
+            tdLog.info("invalid operation: not supported filter condition") 
+
+    def stop(self):
+        tdSql.close()
+        tdLog.success("%s successfully executed" % __file__)
+
+
+tdCases.addWindows(__file__, TDTestCase())
+tdCases.addLinux(__file__, TDTestCase())
diff --git a/tests/pytest/insert/modify_column.py b/tests/pytest/insert/modify_column.py
new file mode 100644
index 0000000000000000000000000000000000000000..3632eb817a269dbf8ae03954ccabf1c5df40266d
--- /dev/null
+++ b/tests/pytest/insert/modify_column.py
@@ -0,0 +1,382 @@
+###################################################################
+#           Copyright (c) 2016 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 -*-
+
+import sys
+import datetime
+
+from util.log import *
+from util.cases import *
+from util.sql import *
+
+
+class TDTestCase:
+    def init(self, conn, logSql):
+        tdLog.debug("start to execute %s" % __file__)
+        tdSql.init(conn.cursor(), logSql)
+
+    def run(self):
+        tdSql.prepare()
+        # test case for https://jira.taosdata.com:18080/browse/TD-4541
+
+        tdLog.info("=============== step1,check normal table")    
+
+        tdLog.info("=============== step1.1,drop table && create table")    
+        cmd1 = 'drop table if exists length11 ;'
+        cmd2 = 'create table length11 (ts timestamp,lengthbia binary(10),lengthnchar nchar(20));'
+        tdLog.info(cmd1)
+        tdSql.execute(cmd1)
+        tdLog.info(cmd2)
+        tdSql.execute(cmd2)
+
+        tdLog.info("=============== step1.2,insert table right data") 
+        cmd1 = 'insert into length11 values(now,\'aaaaaaaaaa\',\'bbbbbbbbbbbbbbbbbbbb\') ;'
+        tdLog.info(cmd1)
+        tdSql.execute(cmd1)         
+        tdSql.query('select * from length11 order by ts desc')
+        tdSql.checkData(0,1,'aaaaaaaaaa') 
+        tdSql.checkData(0,2,'bbbbbbbbbbbbbbbbbbbb')
+
+        tdLog.info("=============== step1.3,insert table wrong data") 
+        cmd1 = 'insert into length11 values(now,\'aaaaaaaaaa1\',\'bbbbbbbbbbbbbbbbbbbb1\') ;'
+        tdLog.info(cmd1)
+        tdSql.error(cmd1)
+        try:
+            tdSql.execute(cmd1)
+            tdLog.exit("string data overflow")
+        except Exception as e:
+            tdLog.info(repr(e))
+            tdLog.info("insert wrong data error catched")      
+        tdSql.query('select * from length11 order by ts desc')
+        tdSql.checkData(0,1,'aaaaaaaaaa') 
+        tdSql.checkData(0,2,'bbbbbbbbbbbbbbbbbbbb')
+
+        tdLog.info("=============== step1.4,modify columu length ") 
+        cmd1 = 'alter table length11 modify column lengthbia binary(10) ;'
+        tdLog.info(cmd1)
+        tdSql.error(cmd1)
+        try:
+            tdSql.execute(cmd1)
+            tdLog.exit("new column length should be bigger than old one")
+        except Exception as e:
+            tdLog.info(repr(e))
+            tdLog.info("new column length should be bigger than old one")   
+
+        cmd2 = 'alter table length11 modify column lengthnchar nchar(20);'
+        tdLog.info(cmd2)
+        tdSql.error(cmd2)
+        try:
+            tdSql.execute(cmd2)
+            tdLog.exit("new column length should be bigger than old one")
+        except Exception as e:
+            tdLog.info(repr(e))
+            tdLog.info("new column length should be bigger than old one") 
+
+        cmd3 = 'alter table length11 modify column lengthbia binary(11) ;'
+        cmd4 = 'describe length11 ;'
+        tdLog.info(cmd3)
+        tdSql.execute(cmd3) 
+        tdLog.info(cmd4)
+        tdSql.execute(cmd4) 
+        tdSql.query('describe length11 ;')
+        tdSql.checkData(1,2,11) 
+
+        cmd5 = 'alter table length11 modify column lengthnchar nchar(21);'
+        cmd6 = 'describe length11 ;'
+        tdLog.info(cmd5)
+        tdSql.execute(cmd5) 
+        tdLog.info(cmd6)
+        tdSql.execute(cmd6) 
+        tdSql.query('describe length11 ;')
+        tdSql.checkData(2,2,21) 
+
+        tdSql.query('select * from length11 order by ts desc')
+        tdSql.checkData(0,1,'aaaaaaaaaa') 
+        tdSql.checkData(0,2,'bbbbbbbbbbbbbbbbbbbb')
+
+
+        tdLog.info("=============== step1.5,insert table right data") 
+        cmd1 = 'insert into length11 values(now,\'aaaaaaaaaa1\',\'bbbbbbbbbbbbbbbbbbbb1\') ;'
+        tdLog.info(cmd1)    
+        tdSql.execute(cmd1)  
+        tdSql.query('select * from length11 order by ts desc')
+        tdSql.checkData(0,1,'aaaaaaaaaa1') 
+        tdSql.checkData(0,2,'bbbbbbbbbbbbbbbbbbbb1')
+
+
+
+
+        tdLog.info("=============== step2,check stable table and tag")    
+
+        tdLog.info("=============== step2.1,drop table && create table")    
+        cmd1 = 'drop table if exists length1 ;'
+        cmd2 = 'drop table if exists length2 ;'
+        cmd3 = 'drop table if exists length2 ;'
+        cmd4 = 'drop table if exists lengthsta1 ;'
+        cmd5 = 'create stable lengthsta1(ts timestamp,lengthbia binary(10),lengthnchar nchar(20)) tags (tlengthbia binary(15),tlengthnchar nchar(25)) ;'
+        cmd6 = 'create table length1 using lengthsta1 tags(\'aaaaabbbbbaaaaa\',\'bbbbbaaaaabbbbbaaaaabbbbb\') ; '
+        tdLog.info(cmd1)
+        tdSql.execute(cmd1)
+        tdLog.info(cmd2)
+        tdSql.execute(cmd2)
+        tdLog.info(cmd3)
+        tdSql.execute(cmd3)
+        tdLog.info(cmd4)
+        tdSql.execute(cmd4)
+        tdLog.info(cmd5)
+        tdSql.execute(cmd5)
+        tdLog.info(cmd6)
+        tdSql.execute(cmd6)
+
+        tdLog.info("=============== step2.2,insert table right data") 
+        cmd1 = 'insert into length1 values(now,\'aaaaaaaaaa\',\'bbbbbbbbbbbbbbbbbbbb\') ;'
+        tdLog.info(cmd1)
+        tdSql.execute(cmd1)         
+        tdSql.query('select * from length1 order by ts desc')
+        tdSql.checkData(0,1,'aaaaaaaaaa') 
+        tdSql.checkData(0,2,'bbbbbbbbbbbbbbbbbbbb')
+
+        tdLog.info("=============== step2.3,insert table wrong data") 
+        cmd1 = 'insert into length1 values(now,\'aaaaaaaaaa1\',\'bbbbbbbbbbbbbbbbbbbb1\') ;'
+        tdLog.info(cmd1)
+        tdSql.error(cmd1)
+        try:
+            tdSql.execute(cmd1)
+            tdLog.exit("string data overflow")
+        except Exception as e:
+            tdLog.info(repr(e))
+            tdLog.info("insert wrong data error catched")      
+        tdSql.query('select * from length1 order by ts desc')
+        tdSql.checkData(0,1,'aaaaaaaaaa') 
+        tdSql.checkData(0,2,'bbbbbbbbbbbbbbbbbbbb')
+
+        tdLog.info("=============== step2.4,modify columu length ") 
+        cmd0 = 'alter table length1 modify column lengthbia binary(10) ;'
+        tdLog.info(cmd0)
+        tdSql.error(cmd0)
+        try:
+            tdSql.execute(cmd1)
+            tdLog.exit("invalid operation: column can only be modified by super table")
+        except Exception as e:
+            tdLog.info(repr(e))
+            tdLog.info("invalid operation: column can only be modified by super table")  
+
+        cmd1 = 'alter table lengthsta1 modify column lengthbia binary(10) ;'
+        tdLog.info(cmd1)
+        tdSql.error(cmd1)
+        try:
+            tdSql.execute(cmd1)
+            tdLog.exit("new column length should be bigger than old one")
+        except Exception as e:
+            tdLog.info(repr(e))
+            tdLog.info("new column length should be bigger than old one")   
+
+        cmd2 = 'alter table lengthsta1 modify column lengthnchar nchar(20);'
+        tdLog.info(cmd2)
+        tdSql.error(cmd2)
+        try:
+            tdSql.execute(cmd2)
+            tdLog.exit("new column length should be bigger than old one")
+        except Exception as e:
+            tdLog.info(repr(e))
+            tdLog.info("new column length should be bigger than old one") 
+
+        cmd3 = 'alter table lengthsta1 modify column lengthbia binary(11) ;'
+        cmd4 = 'describe lengthsta1 ;'
+        tdLog.info(cmd3)
+        tdSql.execute(cmd3) 
+        tdLog.info(cmd4)
+        tdSql.execute(cmd4) 
+        tdSql.query('describe length1 ;')
+        tdSql.checkData(1,2,11) 
+
+        cmd5 = 'alter table lengthsta1 modify column lengthnchar nchar(21);'
+        cmd6 = 'describe lengthsta1 ;'
+        tdLog.info(cmd5)
+        tdSql.execute(cmd5) 
+        tdLog.info(cmd6)
+        tdSql.execute(cmd6) 
+        tdSql.query('describe lengthsta1 ;')
+        tdSql.checkData(2,2,21) 
+
+        tdSql.query('select * from lengthsta1 order by ts desc')
+        tdSql.checkData(0,1,'aaaaaaaaaa') 
+        tdSql.checkData(0,2,'bbbbbbbbbbbbbbbbbbbb')
+
+
+        tdLog.info("=============== step2.5,insert table right data") 
+        cmd1 = 'insert into length1 values(now,\'aaaaaaaaaa1\',\'bbbbbbbbbbbbbbbbbbbb1\') ;'
+        tdLog.info(cmd1)    
+        tdSql.execute(cmd1)  
+        tdSql.query('select * from length1 order by ts desc')
+        tdSql.checkData(0,1,'aaaaaaaaaa1') 
+        tdSql.checkData(0,2,'bbbbbbbbbbbbbbbbbbbb1')
+
+
+
+        tdLog.info("=============== step2.6,create table wrong tag") 
+        cmd1 = 'create table length2 using lengthsta1 tags(\'aaaaabbbbbaaaaa1\',\'bbbbbaaaaabbbbbaaaaabbbbb1\')  ;'
+        tdLog.info(cmd1)
+        tdSql.error(cmd1)
+        try:
+            tdSql.execute(cmd1)
+            tdLog.exit("invalid operation: tag value too long")
+        except Exception as e:
+            tdLog.info(repr(e))
+            tdLog.info("invalid operation: tag value too long")      
+        tdSql.query('select * from lengthsta1 order by ts desc')
+        tdSql.checkData(0,1,'aaaaaaaaaa1') 
+        tdSql.checkData(0,2,'bbbbbbbbbbbbbbbbbbbb1')
+
+        tdLog.info("=============== step2.7,modify tag columu length ")  
+        cmd1 = 'alter table lengthsta1 modify tag tlengthbia binary(15) ;'
+        tdLog.info(cmd1)
+        tdSql.error(cmd1)
+        try:
+            tdSql.execute(cmd1)
+            tdLog.exit("new column length should be bigger than old one")
+        except Exception as e:
+            tdLog.info(repr(e))
+            tdLog.info("new column length should be bigger than old one")   
+
+        cmd2 = 'alter table lengthsta1 modify tag tlengthnchar nchar(25);'
+        tdLog.info(cmd2)
+        tdSql.error(cmd2)
+        try:
+            tdSql.execute(cmd2)
+            tdLog.exit("new column length should be bigger than old one")
+        except Exception as e:
+            tdLog.info(repr(e))
+            tdLog.info("new column length should be bigger than old one") 
+
+        cmd3 = 'alter table lengthsta1 modify tag tlengthbia binary(16) ;'
+        cmd4 = 'describe lengthsta1 ;'
+        tdLog.info(cmd3)
+        tdSql.execute(cmd3) 
+        tdLog.info(cmd4)
+        tdSql.execute(cmd4) 
+        tdSql.query('describe lengthsta1 ;')
+        tdSql.checkData(3,2,16) 
+
+        cmd5 = 'alter table lengthsta1 modify tag tlengthnchar nchar(26);'
+        cmd6 = 'describe lengthsta1 ;'
+        tdLog.info(cmd5)
+        tdSql.execute(cmd5) 
+        tdLog.info(cmd6)
+        tdSql.execute(cmd6) 
+        tdSql.query('describe lengthsta1 ;')
+        tdSql.checkData(4,2,26) 
+
+        tdSql.query('select * from lengthsta1 order by ts desc')
+        tdSql.checkData(0,1,'aaaaaaaaaa1') 
+        tdSql.checkData(0,2,'bbbbbbbbbbbbbbbbbbbb1')
+        tdSql.checkData(0,3,'aaaaabbbbbaaaaa') 
+        tdSql.checkData(0,4,'bbbbbaaaaabbbbbaaaaabbbbb')        
+
+
+        tdLog.info("=============== step2.8,creat tag right data and insert data") 
+        cmd1 = 'create table length2 using lengthsta1 tags(\'aaaaabbbbbaaaaa1\',\'bbbbbaaaaabbbbbaaaaabbbbb1\')  ;'
+        tdLog.info(cmd1)    
+        tdSql.execute(cmd1)  
+        tdSql.query('describe length2 ;')
+        tdSql.checkData(3,2,16) 
+        tdSql.checkData(4,2,26) 
+
+        cmd2 = 'insert into length2 values(now,\'aaaaaaaaaa1\',\'bbbbbbbbbbbbbbbbbbbb1\') ;'
+        tdLog.info(cmd2)    
+        tdSql.execute(cmd2)  
+        tdSql.query('select * from length2 order by ts desc')
+        tdSql.checkData(0,1,'aaaaaaaaaa1') 
+        tdSql.checkData(0,2,'bbbbbbbbbbbbbbbbbbbb1')
+        tdSql.query('select * from lengthsta1 order by ts desc')
+        tdSql.checkData(0,1,'aaaaaaaaaa1') 
+        tdSql.checkData(0,2,'bbbbbbbbbbbbbbbbbbbb1')
+        tdSql.checkData(0,3,'aaaaabbbbbaaaaa1') 
+        tdSql.checkData(0,4,'bbbbbaaaaabbbbbaaaaabbbbb1')  
+
+
+        tdLog.info("=============== step2.9,modify tag columu length again ")  
+        cmd1 = 'alter table lengthsta1 modify tag tlengthbia binary(16) ;'
+        tdLog.info(cmd1)
+        tdSql.error(cmd1)
+        try:
+            tdSql.execute(cmd1)
+            tdLog.exit("new column length should be bigger than old one")
+        except Exception as e:
+            tdLog.info(repr(e))
+            tdLog.info("new column length should be bigger than old one")   
+
+        cmd2 = 'alter table lengthsta1 modify tag tlengthnchar nchar(26);'
+        tdLog.info(cmd2)
+        tdSql.error(cmd2)
+        try:
+            tdSql.execute(cmd2)
+            tdLog.exit("new column length should be bigger than old one")
+        except Exception as e:
+            tdLog.info(repr(e))
+            tdLog.info("new column length should be bigger than old one") 
+
+        cmd3 = 'alter table lengthsta1 modify tag tlengthbia binary(20) ;'
+        cmd4 = 'describe lengthsta1 ;'
+        tdLog.info(cmd3)
+        tdSql.execute(cmd3) 
+        tdLog.info(cmd4)
+        tdSql.execute(cmd4) 
+        tdSql.query('describe lengthsta1 ;')
+        tdSql.checkData(3,2,20) 
+
+        cmd5 = 'alter table lengthsta1 modify tag tlengthnchar nchar(30);'
+        cmd6 = 'describe lengthsta1 ;'
+        tdLog.info(cmd5)
+        tdSql.execute(cmd5) 
+        tdLog.info(cmd6)
+        tdSql.execute(cmd6) 
+        tdSql.query('describe lengthsta1 ;')
+        tdSql.checkData(4,2,30) 
+
+        tdSql.query('select * from lengthsta1 order by ts desc')
+        tdSql.checkData(0,1,'aaaaaaaaaa1') 
+        tdSql.checkData(0,2,'bbbbbbbbbbbbbbbbbbbb1')
+        tdSql.checkData(0,3,'aaaaabbbbbaaaaa1') 
+        tdSql.checkData(0,4,'bbbbbaaaaabbbbbaaaaabbbbb1')        
+
+
+        tdLog.info("=============== step2.10,creat tag right data and insert data again") 
+        cmd1 = 'create table length3 using lengthsta1 tags(\'aaaaabbbbbaaaaabbbbb\',\'bbbbbaaaaabbbbbaaaaabbbbbaaaaa\')  ;'
+        tdLog.info(cmd1)    
+        tdSql.execute(cmd1)  
+        tdSql.query('describe length3 ;')
+        tdSql.checkData(3,2,20) 
+        tdSql.checkData(4,2,30) 
+
+        cmd2 = 'insert into length3 values(now,\'aaaaaaaaaa1\',\'bbbbbbbbbbbbbbbbbbbb1\') ;'
+        tdLog.info(cmd2)    
+        tdSql.execute(cmd2)  
+        tdSql.query('select * from length3 order by ts desc')
+        tdSql.checkData(0,1,'aaaaaaaaaa1') 
+        tdSql.checkData(0,2,'bbbbbbbbbbbbbbbbbbbb1')
+        tdSql.query('select * from lengthsta1 order by ts desc')
+        tdSql.checkData(0,1,'aaaaaaaaaa1') 
+        tdSql.checkData(0,2,'bbbbbbbbbbbbbbbbbbbb1')
+        tdSql.checkData(0,3,'aaaaabbbbbaaaaabbbbb') 
+        tdSql.checkData(0,4,'bbbbbaaaaabbbbbaaaaabbbbbaaaaa')  
+
+
+
+
+    def stop(self):
+        tdSql.close()
+        tdLog.success("%s successfully executed" % __file__)
+
+
+tdCases.addWindows(__file__, TDTestCase())
+tdCases.addLinux(__file__, TDTestCase())