diff --git a/tests/system-test/5-taos-tools/taosdump/TD-12435.py b/tests/system-test/5-taos-tools/taosdump/TD-12435.py
new file mode 100644
index 0000000000000000000000000000000000000000..4aaaba5179807513ea4369122e4fb3497ba1a35f
--- /dev/null
+++ b/tests/system-test/5-taos-tools/taosdump/TD-12435.py
@@ -0,0 +1,829 @@
+###################################################################
+#           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 taos
+import time
+import os
+from util.log import tdLog
+from util.cases import tdCases
+from util.sql import tdSql
+
+
+class TDTestCase:
+    def caseDescription(self):
+        '''
+        case1<xyguo>:taosdump: char "`" can be used for both tag name and column name 
+        ''' 
+        return
+
+    def init(self, conn, logSql):
+        tdLog.debug("start to execute %s" % __file__)
+        tdSql.init(conn.cursor(), logSql)
+
+        now = time.time()
+        self.ts = int(round(now * 1000))
+
+    def table1_checkall(self,sql):
+        tdLog.info(sql)       
+        tdSql.query(sql)
+        tdSql.checkData(0,1,1)
+        tdSql.checkData(0,2,2)
+        tdSql.checkData(0,3,3)
+        tdSql.checkData(0,4,4)
+        tdSql.checkData(0,5,'True')
+        tdSql.checkData(0,6,6)
+        tdSql.checkData(0,7,7)
+        tdSql.checkData(0,8,8)
+        tdSql.checkData(0,9,9)
+        tdSql.checkData(0,10,'1970-01-01 08:00:00.010')
+    
+    def table1_checkall_1(self,sql):
+        tdSql.query(sql)
+        tdSql.checkData(0,1,1)
+
+    def table1_checkall_2(self,sql):
+        self.table1_checkall_1(sql)
+        tdSql.checkData(0,2,2)
+
+    def table1_checkall_3(self,sql):
+        self.table1_checkall_2(sql)
+        tdSql.checkData(0,3,3)
+
+    def table1_checkall_4(self,sql):
+        self.table1_checkall_3(sql)
+        tdSql.checkData(0,4,4)
+
+    def table1_checkall_5(self,sql):
+        self.table1_checkall_4(sql)
+        tdSql.checkData(0,5,'True')
+
+    def table1_checkall_6(self,sql):
+        self.table1_checkall_5(sql)
+        tdSql.checkData(0,6,6)
+
+    def table1_checkall_7(self,sql):
+        self.table1_checkall_6(sql)
+        tdSql.checkData(0,7,7)
+
+    def table1_checkall_8(self,sql):
+        self.table1_checkall_7(sql)
+        tdSql.checkData(0,8,8)
+
+    def table1_checkall_9(self,sql):
+        self.table1_checkall_8(sql)
+        tdSql.checkData(0,9,9)
+
+    def table1_checkall_10(self,sql):
+        self.table1_checkall_9(sql)
+        tdSql.checkData(0,10,'1970-01-01 08:00:00.010')
+
+    def run(self):
+
+        testcaseFilename = os.path.split(__file__)[-1]
+        os.system("rm -rf 5-taos-tools/taosdump/%s.sql" % testcaseFilename ) 
+        tdSql.prepare()
+
+        print("==============step1")
+        print("prepare data")
+       
+        # case for defect: https://jira.taosdata.com:18080/browse/TD-2693
+        tdSql.execute("create database db2")
+        tdSql.execute("use db2")
+        
+        print("==============new version [escape character] for stable==============")
+        print("==============step1,#create db.stable,db.table; insert db.table; show db.table; select db.table; drop db.table;")
+        print("prepare data")
+        
+        self.stb1 = "stable_1~!@#$%^&*()-_+=[]{}':,<.>/?stST13579"
+        self.tb1 = "table_1~!@#$%^&*()-_+=[]{}':,<.>/?stST13579"
+
+        self.col_base = "123~!@#$%^&*()-_+=[]{}':,<.>/?stST13579"
+
+        self.col_int = "stable_col_int%s" %self.col_base
+        print(self.col_int)
+        self.col_bigint = "stable_col_bigint%s" %self.col_base
+        self.col_smallint = "stable_col_smallint%s" %self.col_base
+        self.col_tinyint = "stable_col_tinyint%s" %self.col_base
+        self.col_bool = "stable_col_bool%s" %self.col_base
+        self.col_binary = "stable_col_binary%s" %self.col_base
+        self.col_nchar = "stable_col_nchar%s" %self.col_base
+        self.col_float = "stable_col_float%s" %self.col_base
+        self.col_double = "stable_col_double%s" %self.col_base
+        self.col_ts = "stable_col_ts%s" %self.col_base
+
+        self.tag_base = "abc~!@#$%^&*()-_+=[]{}':,<.>/?stST13579"
+        self.tag_int = "stable_tag_int%s" %self.tag_base
+        self.tag_bigint = "stable_tag_bigint%s" %self.tag_base
+        self.tag_smallint = "stable_tag_smallint%s" %self.tag_base
+        self.tag_tinyint = "stable_tag_tinyint%s" %self.tag_base
+        self.tag_bool = "stable_tag_bool%s" %self.tag_base
+        self.tag_binary = "stable_tag_binary%s" %self.tag_base
+        self.tag_nchar = "stable_tag_nchar%s" %self.tag_base
+        self.tag_float = "stable_tag_float%s" %self.tag_base
+        self.tag_double = "stable_tag_double%s" %self.tag_base
+        self.tag_ts = "stable_tag_ts%s" %self.tag_base
+
+        tdSql.execute('''create stable db.`%s` (ts timestamp, `%s` int , `%s` bigint , `%s` smallint , `%s` tinyint, `%s` bool , 
+                        `%s` binary(20) , `%s` nchar(20) ,`%s` float , `%s` double , `%s` timestamp) 
+                        tags(loc nchar(20),  `%s` int , `%s` bigint , `%s` smallint , `%s` tinyint, `%s` bool , 
+                        `%s` binary(20) , `%s` nchar(20) ,`%s` float , `%s` double , `%s` timestamp);'''
+                        %(self.stb1, self.col_int, self.col_bigint, self.col_smallint, self.col_tinyint, self.col_bool, 
+                        self.col_binary, self.col_nchar, self.col_float, self.col_double, self.col_ts, 
+                        self.tag_int, self.tag_bigint, self.tag_smallint, self.tag_tinyint, self.tag_bool, 
+                        self.tag_binary, self.tag_nchar, self.tag_float, self.tag_double, self.tag_ts))
+        tdSql.query("describe db.`%s` ; " %self.stb1)
+        tdSql.checkRows(22)
+
+        tdSql.query("select _block_dist() from db.`%s` ; " %self.stb1)
+        tdSql.checkRows(0)
+
+        tdSql.query("show create stable db.`%s` ; " %self.stb1)
+        tdSql.checkData(0, 0, self.stb1)
+        tdSql.checkData(0, 1, "create table `%s` (`ts` TIMESTAMP,`%s` INT,`%s` BIGINT,`%s` SMALLINT,`%s` TINYINT,`%s` BOOL,`%s` BINARY(20),`%s` NCHAR(20),`%s` FLOAT,`%s` DOUBLE,`%s` TIMESTAMP)\
+ TAGS (`loc` NCHAR(20),`%s` INT,`%s` BIGINT,`%s` SMALLINT,`%s` TINYINT,`%s` BOOL,`%s` BINARY(20),`%s` NCHAR(20),`%s` FLOAT,`%s` DOUBLE,`%s` TIMESTAMP)" 
+                    %(self.stb1, self.col_int, self.col_bigint, self.col_smallint, self.col_tinyint, self.col_bool, 
+                        self.col_binary, self.col_nchar, self.col_float, self.col_double, self.col_ts, 
+                        self.tag_int, self.tag_bigint, self.tag_smallint, self.tag_tinyint, self.tag_bool, 
+                        self.tag_binary, self.tag_nchar, self.tag_float, self.tag_double, self.tag_ts))
+
+        tdSql.execute("create table db.`table!1` using db.`%s` tags('table_1' , '0' , '0' , '0' , '0' , 0 , '0' , '0' , '0' , '0' ,'0')" %self.stb1)
+        tdSql.query("describe db.`table!1` ; ")
+        tdSql.checkRows(22)
+
+        time.sleep(10)
+        tdSql.query("show create table db.`table!1` ; ")
+        tdSql.checkData(0, 0, "table!1")
+        tdSql.checkData(0, 1, "CREATE TABLE `table!1` USING `%s` TAGS (\"table_1\",0,0,0,0,false,\"0\",\"0\",0.000000,0.000000,\"0\")" %self.stb1)
+        
+        tdSql.execute("insert into db.`table!1` values(now, 1 , 2, 3, 4, 5, 6 ,7 ,8 ,9 ,10)")        
+        sql = " select * from  db.`table!1`; "
+        datacheck = self.table1_checkall(sql)
+        tdSql.checkRows(1)
+        sql = '''select ts ,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`,`%s` from  db.`table!1`; '''\
+                %(self.col_int, self.col_bigint, self.col_smallint, self.col_tinyint, self.col_bool, self.col_binary, self.col_nchar, self.col_float, self.col_double, self.col_ts) 
+        datacheck = self.table1_checkall(sql)
+        tdSql.checkRows(1)
+        
+        time.sleep(1)
+        tdSql.execute('''insert into db.`table!1`(ts ,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`) values(now, 1 , 2, 3, 4, 5, 6 ,7 ,8 ,9 ,10)'''\
+                %(self.col_int, self.col_bigint, self.col_smallint, self.col_tinyint, self.col_bool, self.col_binary, self.col_nchar, self.col_float, self.col_double, self.col_ts) )        
+        sql = " select * from  db.`table!1`; "
+        datacheck = self.table1_checkall(sql)
+        tdSql.checkRows(2)
+
+        tdSql.query("select count(*) from  db.`table!1`; ")
+        tdSql.checkData(0, 0, 2)       
+        tdSql.query("select _block_dist() from db.`%s` ; " %self.stb1)
+        tdSql.checkRows(1)
+
+        tdSql.execute("create table db.`%s` using db.`%s` TAGS (\"table_2\",2,2,2,2,true,\"2\",\"2\",2.000000,2.000000,\"2\")" %(self.tb1,self.stb1))
+        tdSql.query("describe db.`%s` ; " %self.tb1)
+        tdSql.checkRows(22)
+        tdSql.query("show create table db.`%s` ; " %self.tb1)
+        tdSql.checkData(0, 0, self.tb1)
+        tdSql.checkData(0, 1, "CREATE TABLE `%s` USING `%s` TAGS (\"table_2\",2,2,2,2,true,\"2\",\"2\",2.000000,2.000000,\"2\")" %(self.tb1,self.stb1))
+        
+        tdSql.execute("insert into db.`%s`  values(now, 1 , 2, 3, 4, 5, 6 ,7 ,8 ,9 ,10)" %self.tb1)       
+        sql = "select * from  db.`%s` ; " %self.tb1
+        datacheck = self.table1_checkall(sql)
+        tdSql.checkRows(1)
+        sql = '''select ts ,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`,`%s` from  db.`%s` ; '''\
+                %(self.col_int, self.col_bigint, self.col_smallint, self.col_tinyint, self.col_bool, self.col_binary, self.col_nchar, self.col_float, self.col_double, self.col_ts,\
+                self.tag_int, self.tag_bigint, self.tag_smallint, self.tag_tinyint, self.tag_bool, self.tag_binary, self.tag_nchar, self.tag_float, self.tag_double, self.tag_ts, self.tb1) 
+        datacheck = self.table1_checkall(sql)
+        tdSql.checkRows(1)        
+
+        time.sleep(1)
+        tdSql.execute('''insert into db.`%s`(ts ,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`) values(now, 1 , 2, 3, 4, 5, 6 ,7 ,8 ,9 ,10)'''\
+                %(self.tb1, self.col_int, self.col_bigint, self.col_smallint, self.col_tinyint, self.col_bool, self.col_binary, self.col_nchar, self.col_float, self.col_double, self.col_ts) )        
+        sql = " select * from  db.`%s` ; " %self.tb1
+        datacheck = self.table1_checkall(sql)
+        tdSql.checkRows(2)
+
+        sql = " select * from  db.`%s` where `%s`=1 and `%s`=2 and `%s`=3 and `%s`=4 and `%s`='True' and `%s`=6 and `%s`=7 and `%s`=8 and `%s`=9 and `%s`=10; " \
+            %(self.tb1, self.col_int, self.col_bigint, self.col_smallint, self.col_tinyint, self.col_bool, self.col_binary, self.col_nchar, self.col_float, self.col_double, self.col_ts)
+        datacheck = self.table1_checkall(sql)
+        tdSql.checkRows(2)
+
+        tdSql.query("select count(*) from  db.`%s`; "  %self.tb1)
+        tdSql.checkData(0, 0, 2)
+        sql = "select * from  db.`%s` ; "  %self.stb1       
+        datacheck = self.table1_checkall(sql)
+        tdSql.checkRows(4)
+        tdSql.query("select count(*) from  db.`%s`; " %self.stb1)
+        tdSql.checkData(0, 0, 4)
+
+        sql = "select * from (select * from db.`%s`) ; " %self.stb1       
+        datacheck = self.table1_checkall(sql)
+        tdSql.checkRows(4)
+        tdSql.query("select count(*) from (select * from db.`%s`) ; " %self.stb1)
+        tdSql.checkData(0, 0, 4)
+
+        sql = "select * from (select ts ,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`,`%s` from db.`%s`) ; " \
+                    %(self.col_int, self.col_bigint, self.col_smallint, self.col_tinyint, self.col_bool, self.col_binary, self.col_nchar, self.col_float, self.col_double, self.col_ts, self.stb1)
+        datacheck = self.table1_checkall(sql)
+        tdSql.checkRows(4)
+
+        sql = "select ts ,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`,`%s` from (select ts ,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`,`%s` from db.`%s`) ; " \
+                    %(self.col_int, self.col_bigint, self.col_smallint, self.col_tinyint, self.col_bool, self.col_binary, self.col_nchar, self.col_float, self.col_double, self.col_ts,\
+                    self.col_int, self.col_bigint, self.col_smallint, self.col_tinyint, self.col_bool, self.col_binary, self.col_nchar, self.col_float, self.col_double, self.col_ts, self.stb1)
+        datacheck = self.table1_checkall(sql)
+        tdSql.checkRows(4)
+
+        sql = "select ts ,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`,`%s` from (select ts ,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`,`%s` from db.`%s`\
+                    where `%s`=1 and `%s`=2 and `%s`=3 and `%s`=4 and `%s`='True' and `%s`=6 and `%s`=7 and `%s`=8 and `%s`=9 and `%s`=10 ) ; " \
+                    %(self.col_int, self.col_bigint, self.col_smallint, self.col_tinyint, self.col_bool, self.col_binary, self.col_nchar, self.col_float, self.col_double, self.col_ts,\
+                    self.col_int, self.col_bigint, self.col_smallint, self.col_tinyint, self.col_bool, self.col_binary, self.col_nchar, self.col_float, self.col_double, self.col_ts, self.stb1, \
+                    self.col_int, self.col_bigint, self.col_smallint, self.col_tinyint, self.col_bool, self.col_binary, self.col_nchar, self.col_float, self.col_double, self.col_ts)
+        datacheck = self.table1_checkall(sql)
+        tdSql.checkRows(4)
+
+        tdSql.query("show db.stables like 'stable_1%' ")
+        tdSql.checkRows(1)
+        tdSql.query("show db.tables like 'table%' ")
+        tdSql.checkRows(2)
+
+        self.cr_tb1 = "create_table_1~!@#$%^&*()-_+=[]{}':,<.>/?stST13579"
+        tdSql.execute("create table db.`%s` as select avg(`%s`) from db.`%s` where ts > now interval(1m) sliding(30s);" %(self.cr_tb1,self.col_bigint,self.stb1))
+        tdSql.query("show db.tables like 'create_table_%' ")
+        tdSql.checkRows(1)
+
+        print("==============drop\ add\ change\ modify column or tag")
+        print("==============drop==============")
+        tdSql.execute("ALTER TABLE db.`%s` DROP TAG `%s`; " %(self.stb1, self.tag_ts))
+        sql = " select * from  db.`%s`; " %self.stb1
+        datacheck = self.table1_checkall(sql)
+        tdSql.query("describe db.`%s` ; " %self.tb1)
+        tdSql.checkRows(21)
+        tdSql.execute("ALTER TABLE db.`%s` DROP TAG `%s`; " %(self.stb1, self.tag_double))
+        sql = " select * from  db.`%s`; " %self.stb1
+        datacheck = self.table1_checkall(sql)
+        tdSql.query("describe db.`%s` ; " %self.tb1)
+        tdSql.checkRows(20)
+        tdSql.execute("ALTER TABLE db.`%s` DROP TAG `%s`; " %(self.stb1, self.tag_float))
+        sql = " select * from  db.`%s`; " %self.stb1
+        datacheck = self.table1_checkall(sql)
+        tdSql.query("describe db.`%s` ; " %self.tb1)
+        tdSql.checkRows(19)
+        tdSql.execute("ALTER TABLE db.`%s` DROP TAG `%s`; " %(self.stb1, self.tag_nchar))
+        sql = " select * from  db.`%s`; " %self.stb1
+        datacheck = self.table1_checkall(sql)
+        tdSql.query("describe db.`%s` ; " %self.tb1)
+        tdSql.checkRows(18)
+        tdSql.execute("ALTER TABLE db.`%s` DROP TAG `%s`; " %(self.stb1, self.tag_binary))
+        sql = " select * from  db.`%s`; " %self.stb1
+        datacheck = self.table1_checkall(sql)
+        tdSql.query("describe db.`%s` ; " %self.tb1)
+        tdSql.checkRows(17)
+        tdSql.execute("ALTER TABLE db.`%s` DROP TAG `%s`; " %(self.stb1, self.tag_bool))
+        sql = " select * from  db.`%s`; " %self.stb1
+        datacheck = self.table1_checkall(sql)
+        tdSql.query("describe db.`%s` ; " %self.tb1)
+        tdSql.checkRows(16)
+        tdSql.execute("ALTER TABLE db.`%s` DROP TAG `%s`; " %(self.stb1, self.tag_tinyint))
+        sql = " select * from  db.`%s`; " %self.stb1
+        datacheck = self.table1_checkall(sql)
+        tdSql.query("describe db.`%s` ; " %self.tb1)
+        tdSql.checkRows(15)
+        tdSql.execute("ALTER TABLE db.`%s` DROP TAG `%s`; " %(self.stb1, self.tag_smallint))
+        sql = " select * from  db.`%s`; " %self.stb1
+        datacheck = self.table1_checkall(sql)
+        tdSql.query("describe db.`%s` ; " %self.tb1)
+        tdSql.checkRows(14)
+        tdSql.execute("ALTER TABLE db.`%s` DROP TAG `%s`; " %(self.stb1, self.tag_bigint))
+        sql = " select * from  db.`%s`; " %self.stb1
+        datacheck = self.table1_checkall(sql)
+        tdSql.query("describe db.`%s` ; " %self.tb1)
+        tdSql.checkRows(13)
+        tdSql.execute("ALTER TABLE db.`%s` DROP TAG `%s`; " %(self.stb1, self.tag_int))
+        sql = " select * from  db.`%s`; " %self.stb1
+        datacheck = self.table1_checkall(sql)
+        tdSql.query("describe db.`%s` ; " %self.tb1)
+        tdSql.checkRows(12)
+
+        tdSql.execute("ALTER TABLE db.`%s` DROP COLUMN `%s`; " %(self.stb1, self.col_ts))
+        sql = " select * from  db.`%s`; " %self.stb1
+        datacheck = self.table1_checkall_9(sql)
+        tdSql.query("describe db.`%s` ; " %self.tb1)
+        tdSql.checkRows(11)
+        tdSql.execute("ALTER TABLE db.`%s` DROP COLUMN `%s`; " %(self.stb1, self.col_double))
+        sql = " select * from  db.`%s`; " %self.stb1
+        datacheck = self.table1_checkall_8(sql)
+        tdSql.query("describe db.`%s` ; " %self.tb1)
+        tdSql.checkRows(10)
+        tdSql.execute("ALTER TABLE db.`%s` DROP COLUMN `%s`; " %(self.stb1, self.col_float))
+        sql = " select * from  db.`%s`; " %self.stb1
+        datacheck = self.table1_checkall_7(sql)
+        tdSql.query("describe db.`%s` ; " %self.tb1)
+        tdSql.checkRows(9)
+        tdSql.execute("ALTER TABLE db.`%s` DROP COLUMN `%s`; " %(self.stb1, self.col_nchar))
+        sql = " select * from  db.`%s`; " %self.stb1
+        datacheck = self.table1_checkall_6(sql)
+        tdSql.query("describe db.`%s` ; " %self.tb1)
+        tdSql.checkRows(8)
+        tdSql.execute("ALTER TABLE db.`%s` DROP COLUMN `%s`; " %(self.stb1, self.col_binary))
+        sql = " select * from  db.`%s`; " %self.stb1
+        datacheck = self.table1_checkall_5(sql)
+        tdSql.query("describe db.`%s` ; " %self.tb1)
+        tdSql.checkRows(7)
+        tdSql.execute("ALTER TABLE db.`%s` DROP COLUMN `%s`; " %(self.stb1, self.col_bool))
+        sql = " select * from  db.`%s`; " %self.stb1
+        datacheck = self.table1_checkall_4(sql)
+        tdSql.query("describe db.`%s` ; " %self.tb1)
+        tdSql.checkRows(6)
+        tdSql.execute("ALTER TABLE db.`%s` DROP COLUMN `%s`; " %(self.stb1, self.col_tinyint))
+        sql = " select * from  db.`%s`; " %self.stb1
+        datacheck = self.table1_checkall_3(sql)
+        tdSql.query("describe db.`%s` ; " %self.tb1)
+        tdSql.checkRows(5)
+        tdSql.execute("ALTER TABLE db.`%s` DROP COLUMN `%s`; " %(self.stb1, self.col_smallint))
+        sql = " select * from  db.`%s`; " %self.stb1
+        datacheck = self.table1_checkall_2(sql)
+        tdSql.query("describe db.`%s` ; " %self.tb1)
+        tdSql.checkRows(4)
+        tdSql.execute("ALTER TABLE db.`%s` DROP COLUMN `%s`; " %(self.stb1, self.col_bigint))
+        sql = " select * from  db.`%s`; " %self.stb1
+        datacheck = self.table1_checkall_1(sql)
+        tdSql.query("describe db.`%s` ; " %self.tb1)
+        tdSql.checkRows(3)
+        tdSql.error("ALTER TABLE db.`%s` DROP COLUMN `%s`; " %(self.stb1, self.col_int))
+        tdSql.query("describe db.`%s` ; " %self.tb1)
+        tdSql.checkRows(3)
+
+        print("==============add==============")
+        tdSql.execute("ALTER TABLE db.`%s` ADD COLUMN `%s` bigint; " %(self.stb1, self.col_bigint))
+        tdSql.query("describe db.`%s` ; " %self.tb1)
+        tdSql.checkRows(4)
+        tdSql.execute("ALTER TABLE db.`%s` ADD COLUMN `%s` smallint; " %(self.stb1, self.col_smallint))
+        tdSql.query("describe db.`%s` ; " %self.tb1)
+        tdSql.checkRows(5)
+        tdSql.execute("ALTER TABLE db.`%s` ADD COLUMN `%s` tinyint; " %(self.stb1, self.col_tinyint))
+        tdSql.query("describe db.`%s` ; " %self.tb1)
+        tdSql.checkRows(6)
+        tdSql.execute("ALTER TABLE db.`%s` ADD COLUMN `%s` bool; " %(self.stb1, self.col_bool))
+        tdSql.query("describe db.`%s` ; " %self.tb1)
+        tdSql.checkRows(7)
+        tdSql.execute("ALTER TABLE db.`%s` ADD COLUMN `%s` binary(20); " %(self.stb1, self.col_binary))
+        tdSql.query("describe db.`%s` ; " %self.tb1)
+        tdSql.checkRows(8)
+
+        tdSql.execute("insert into db.`%s`  values(now, 1 , 2, 3, 4, 5, 6)" %self.tb1)       
+        sql = "select * from  db.`%s` order by ts desc; " %self.tb1
+        datacheck = self.table1_checkall_5(sql)
+
+        tdSql.execute("ALTER TABLE db.`%s` ADD COLUMN `%s` nchar(20); " %(self.stb1, self.col_nchar))
+        tdSql.query("describe db.`%s` ; " %self.tb1)
+        tdSql.checkRows(9)
+        tdSql.execute("ALTER TABLE db.`%s` ADD COLUMN `%s` float; " %(self.stb1, self.col_float))
+        tdSql.query("describe db.`%s` ; " %self.tb1)
+        tdSql.checkRows(10)
+        tdSql.execute("ALTER TABLE db.`%s` ADD COLUMN `%s` double; " %(self.stb1, self.col_double))
+        tdSql.query("describe db.`%s` ; " %self.tb1)
+        tdSql.checkRows(11)
+        tdSql.execute("ALTER TABLE db.`%s` ADD COLUMN `%s` timestamp; " %(self.stb1, self.col_ts))
+        tdSql.query("describe db.`%s` ; " %self.tb1)
+        tdSql.checkRows(12)
+
+        tdSql.execute("insert into db.`%s`  values(now, 1 , 2, 3, 4, 5, 6 ,7 ,8 ,9 ,10)" %self.tb1)       
+        sql = "select * from  db.`%s` order by ts desc; " %self.tb1
+        datacheck = self.table1_checkall(sql)
+
+        tdSql.execute("ALTER TABLE db.`%s` ADD TAG `%s` int; " %(self.stb1, self.tag_int))
+        sql = " select * from  db.`%s` order by ts desc; " %self.stb1
+        datacheck = self.table1_checkall(sql)
+        tdSql.query("describe db.`%s` ; " %self.tb1)
+        tdSql.checkRows(13)
+        tdSql.execute("ALTER TABLE db.`%s` ADD TAG `%s` bigint; " %(self.stb1, self.tag_bigint))
+        sql = " select * from  db.`%s` order by ts desc; " %self.stb1
+        datacheck = self.table1_checkall(sql)
+        tdSql.query("describe db.`%s` ; " %self.tb1)
+        tdSql.checkRows(14)
+        tdSql.execute("ALTER TABLE db.`%s` ADD TAG `%s` smallint; " %(self.stb1, self.tag_smallint))
+        sql = " select * from  db.`%s` order by ts desc; " %self.stb1
+        datacheck = self.table1_checkall(sql)
+        tdSql.query("describe db.`%s` ; " %self.tb1)
+        tdSql.checkRows(15)
+        tdSql.execute("ALTER TABLE db.`%s` ADD TAG `%s` tinyint; " %(self.stb1, self.tag_tinyint))
+        sql = " select * from  db.`%s` order by ts desc; " %self.stb1
+        datacheck = self.table1_checkall(sql)
+        tdSql.query("describe db.`%s` ; " %self.tb1)
+        tdSql.checkRows(16)
+        tdSql.execute("ALTER TABLE db.`%s` ADD TAG `%s` bool; " %(self.stb1, self.tag_bool))
+        sql = " select * from  db.`%s` order by ts desc; " %self.stb1
+        datacheck = self.table1_checkall(sql)
+        tdSql.query("describe db.`%s` ; " %self.tb1)
+        tdSql.checkRows(17)
+        tdSql.execute("ALTER TABLE db.`%s` ADD TAG `%s` binary(20); " %(self.stb1, self.tag_binary))
+        sql = " select * from  db.`%s` order by ts desc; " %self.stb1
+        datacheck = self.table1_checkall(sql)
+        tdSql.query("describe db.`%s` ; " %self.tb1)
+        tdSql.checkRows(18)
+        tdSql.execute("ALTER TABLE db.`%s` ADD TAG `%s` nchar(20); " %(self.stb1, self.tag_nchar))
+        sql = " select * from  db.`%s` order by ts desc; " %self.stb1
+        datacheck = self.table1_checkall(sql)
+        tdSql.query("describe db.`%s` ; " %self.tb1)
+        tdSql.checkRows(19)
+        tdSql.execute("ALTER TABLE db.`%s` ADD TAG `%s` float; " %(self.stb1, self.tag_float))
+        sql = " select * from  db.`%s` order by ts desc; " %self.stb1
+        datacheck = self.table1_checkall(sql)
+        tdSql.query("describe db.`%s` ; " %self.tb1)
+        tdSql.checkRows(20)
+        tdSql.execute("ALTER TABLE db.`%s` ADD TAG `%s` double; " %(self.stb1, self.tag_double))
+        sql = " select * from  db.`%s` order by ts desc; " %self.stb1
+        datacheck = self.table1_checkall(sql)
+        tdSql.query("describe db.`%s` ; " %self.tb1)
+        tdSql.checkRows(21)
+        tdSql.execute("ALTER TABLE db.`%s` ADD TAG `%s` timestamp; " %(self.stb1, self.tag_ts))
+        sql = " select * from  db.`%s` order by ts desc; " %self.stb1
+        datacheck = self.table1_checkall(sql)
+        tdSql.query("describe db.`%s` ; " %self.tb1)
+        tdSql.checkRows(22)
+
+        print("==============change==============")
+        self.tag_base_change = "abcdas"
+        self.tag_int_change = "stable_tag_int%s" %self.tag_base_change
+        self.tag_bigint_change = "stable_tag_bigint%s" %self.tag_base_change
+        self.tag_smallint_change = "stable_tag_smallint%s" %self.tag_base_change
+        self.tag_tinyint_change = "stable_tag_tinyint%s" %self.tag_base_change
+        self.tag_bool_change = "stable_tag_bool%s" %self.tag_base_change
+        self.tag_binary_change = "stable_tag_binary%s" %self.tag_base_change
+        self.tag_nchar_change = "stable_tag_nchar%s" %self.tag_base_change
+        self.tag_float_change = "stable_tag_float%s" %self.tag_base_change
+        self.tag_double_change = "stable_tag_double%s" %self.tag_base_change
+        self.tag_ts_change = "stable_tag_ts%s" %self.tag_base_change
+
+        tdSql.execute("ALTER TABLE db.`%s` CHANGE TAG `%s` `%s`; " %(self.stb1, self.tag_int, self.tag_int_change))
+        sql = " select * from  db.`%s` order by ts desc; " %self.stb1
+        datacheck = self.table1_checkall(sql)
+        tdSql.query("describe db.`%s` ; " %self.tb1)
+        tdSql.checkRows(22)
+        tdSql.execute("ALTER TABLE db.`%s` CHANGE TAG `%s` `%s`; " %(self.stb1, self.tag_bigint, self.tag_bigint_change))
+        sql = " select * from  db.`%s` order by ts desc; " %self.stb1
+        datacheck = self.table1_checkall(sql)
+        tdSql.query("describe db.`%s` ; " %self.tb1)
+        tdSql.checkRows(22)
+        tdSql.execute("ALTER TABLE db.`%s` CHANGE TAG `%s` `%s`; " %(self.stb1, self.tag_smallint, self.tag_smallint_change))
+        sql = " select * from  db.`%s` order by ts desc; " %self.stb1
+        datacheck = self.table1_checkall(sql)
+        tdSql.query("describe db.`%s` ; " %self.tb1)
+        tdSql.checkRows(22)
+        tdSql.execute("ALTER TABLE db.`%s` CHANGE TAG `%s` `%s`; " %(self.stb1, self.tag_tinyint, self.tag_tinyint_change))
+        sql = " select * from  db.`%s` order by ts desc; " %self.stb1
+        datacheck = self.table1_checkall(sql)
+        tdSql.query("describe db.`%s` ; " %self.tb1)
+        tdSql.checkRows(22)
+        tdSql.execute("ALTER TABLE db.`%s` CHANGE TAG `%s` `%s`; " %(self.stb1, self.tag_bool, self.tag_bool_change))
+        sql = " select * from  db.`%s` order by ts desc; " %self.stb1
+        datacheck = self.table1_checkall(sql)
+        tdSql.query("describe db.`%s` ; " %self.tb1)
+        tdSql.checkRows(22)
+        tdSql.execute("ALTER TABLE db.`%s` CHANGE TAG `%s` `%s`; " %(self.stb1, self.tag_binary, self.tag_binary_change))
+        sql = " select * from  db.`%s` order by ts desc; " %self.stb1
+        datacheck = self.table1_checkall(sql)
+        tdSql.query("describe db.`%s` ; " %self.tb1)
+        tdSql.checkRows(22)
+        tdSql.execute("ALTER TABLE db.`%s` CHANGE TAG `%s` `%s`; " %(self.stb1, self.tag_nchar, self.tag_nchar_change))
+        sql = " select * from  db.`%s` order by ts desc; " %self.stb1
+        datacheck = self.table1_checkall(sql)
+        tdSql.query("describe db.`%s` ; " %self.tb1)
+        tdSql.checkRows(22)
+        tdSql.execute("ALTER TABLE db.`%s` CHANGE TAG `%s` `%s`; " %(self.stb1, self.tag_float, self.tag_float_change))
+        sql = " select * from  db.`%s` order by ts desc; " %self.stb1
+        datacheck = self.table1_checkall(sql)
+        tdSql.query("describe db.`%s` ; " %self.tb1)
+        tdSql.checkRows(22)
+        tdSql.execute("ALTER TABLE db.`%s` CHANGE TAG `%s` `%s`; " %(self.stb1, self.tag_double, self.tag_double_change))
+        sql = " select * from  db.`%s` order by ts desc; " %self.stb1
+        datacheck = self.table1_checkall(sql)
+        tdSql.query("describe db.`%s` ; " %self.tb1)
+        tdSql.checkRows(22)
+        tdSql.execute("ALTER TABLE db.`%s` CHANGE TAG `%s` `%s`; " %(self.stb1, self.tag_ts, self.tag_ts_change))
+        sql = " select * from  db.`%s` order by ts desc; " %self.stb1
+        datacheck = self.table1_checkall(sql)
+        tdSql.query("describe db.`%s` ; " %self.tb1)
+        tdSql.checkRows(22)
+
+        print("==============modify==============")
+        # TD-10810
+        tdSql.execute("ALTER STABLE db.`%s` MODIFY TAG `%s` binary(30); ; " %(self.stb1, self.tag_binary_change))
+        sql = " select * from  db.`%s` order by ts desc; " %self.stb1
+        datacheck = self.table1_checkall(sql)
+        tdSql.query("describe db.`%s` ; " %self.tb1)
+        tdSql.checkRows(22)
+        tdSql.execute("ALTER STABLE db.`%s` MODIFY TAG `%s` nchar(30); ; " %(self.stb1, self.tag_nchar_change))
+        sql = " select * from  db.`%s` order by ts desc; " %self.stb1
+        datacheck = self.table1_checkall(sql)
+        tdSql.query("describe db.`%s` ; " %self.tb1)
+        tdSql.checkRows(22)      
+
+        tdSql.execute("ALTER STABLE db.`%s` MODIFY COLUMN `%s` binary(30); ; " %(self.stb1, self.col_binary))
+        sql = " select * from  db.`%s` order by ts desc; " %self.stb1
+        datacheck = self.table1_checkall(sql)
+        tdSql.query("describe db.`%s` ; " %self.tb1)
+        tdSql.checkRows(22)    
+        tdSql.execute("ALTER STABLE db.`%s` MODIFY COLUMN `%s` nchar(30); ; " %(self.stb1, self.col_nchar))
+        sql = " select * from  db.`%s` order by ts desc; " %self.stb1
+        datacheck = self.table1_checkall(sql)
+        tdSql.query("describe db.`%s` ; " %self.tb1)
+        tdSql.checkRows(22)  
+
+        print("==============drop table\stable")
+        try:
+            tdSql.execute("drop table db.`%s` " %self.tb1)
+        except Exception as e:
+            tdLog.exit(e)
+
+        tdSql.error("select * from db.`%s`" %self.tb1)
+        tdSql.query("show db.stables like 'stable_1%' ")
+        tdSql.checkRows(1)
+
+        try:
+            tdSql.execute("drop table db.`%s` " %self.stb1)
+        except Exception as e:
+            tdLog.exit(e)
+
+        tdSql.error("select * from db.`%s`" %self.tb1)
+        tdSql.error("select * from db.`%s`" %self.stb1)
+       
+        
+        print("==============step2,#create stable,table; insert table; show table; select table; drop table")
+        
+        self.stb2 = "stable_2~!@#$%^&*()-_+=[]{}';:,<.>/?stST24680~!@#$%^&*()-_+=[]{}"
+        self.tb2 = "table_2~!@#$%^&*()-_+=[]{}';:,<.>/?stST24680~!@#$%^&*()-_+=[]{}"
+
+        tdSql.execute("create stable `%s` (ts timestamp, i int) tags(j int);" %self.stb2)
+        tdSql.query("describe `%s` ; "%self.stb2)
+        tdSql.checkRows(3)
+
+        tdSql.query("select _block_dist() from `%s` ; " %self.stb2)
+        tdSql.checkRows(0)
+
+        tdSql.query("show create stable `%s` ; " %self.stb2)
+        tdSql.checkData(0, 0, self.stb2)
+        tdSql.checkData(0, 1, "create table `%s` (`ts` TIMESTAMP,`i` INT) TAGS (`j` INT)" %self.stb2)
+
+        tdSql.execute("create table `table!2` using `%s` tags(1)" %self.stb2)
+        tdSql.query("describe `table!2` ; ")
+        tdSql.checkRows(3)
+
+        time.sleep(10)
+
+        tdSql.query("show create table `table!2` ; ")
+        tdSql.checkData(0, 0, "table!2")
+        tdSql.checkData(0, 1, "CREATE TABLE `table!2` USING `%s` TAGS (1)" %self.stb2)
+        tdSql.execute("insert into `table!2` values(now, 1)")
+        tdSql.query("select * from  `table!2`; ")
+        tdSql.checkRows(1)
+        tdSql.query("select count(*) from  `table!2`; ")
+        tdSql.checkData(0, 0, 1)
+        tdSql.query("select _block_dist() from `%s` ; " %self.stb2)
+        tdSql.checkRows(1)
+
+        tdSql.execute("create table `%s` using `%s` tags(1)" %(self.tb2,self.stb2))
+        tdSql.query("describe `%s` ; " %self.tb2)
+        tdSql.checkRows(3)
+        tdSql.query("show create table `%s` ; " %self.tb2)
+        tdSql.checkData(0, 0, self.tb2)
+        tdSql.checkData(0, 1, "CREATE TABLE `%s` USING `%s` TAGS (1)" %(self.tb2,self.stb2))
+        tdSql.execute("insert into `%s`  values(now, 1)" %self.tb2)
+        tdSql.query("select * from  `%s` ; " %self.tb2)
+        tdSql.checkRows(1)
+        tdSql.query("select count(*) from  `%s`; " %self.tb2)
+        tdSql.checkData(0, 0, 1)
+        tdSql.query("select * from  `%s` ; " %self.stb2)
+        tdSql.checkRows(2)
+        tdSql.query("select count(*) from  `%s`; " %self.stb2)
+        tdSql.checkData(0, 0, 2)
+
+        tdSql.query("select * from (select * from `%s`) ; "  %self.stb2)
+        tdSql.checkRows(2)
+        tdSql.query("select count(*) from (select * from `%s` ); "  %self.stb2)
+        tdSql.checkData(0, 0, 2)
+
+        tdSql.query("show stables like 'stable_2%' ")
+        tdSql.checkRows(1)
+        tdSql.query("show tables like 'table%' ")
+        tdSql.checkRows(2)
+
+
+        #TD-10536
+        self.cr_tb2 = "create_table_2~!@#$%^&*()-_+=[]{}';:,<.>/?stST24680~!@#$%^&*()-_+=[]{}"
+        tdSql.execute("create table `%s` as select * from `%s` ;" %(self.cr_tb2,self.stb2))
+        tdSql.query("show db.tables like 'create_table_%' ")
+        tdSql.checkRows(1)
+
+
+        print("==============step3,#create regular_table; insert regular_table; show regular_table; select regular_table; drop regular_table")
+        self.regular_table = "regular_table~!@#$%^&*()-_+=[]{}';:,<.>/?stST24680~!@#$%^&*()-_+=[]{}"
+        
+        self.regular_col_base = "123@#$%^&*()-_+=[]{};:,<.>/?~!$%^"
+
+        self.col_int = "regular_table_col_int%s" %self.regular_col_base
+        print(self.col_int)
+        self.col_bigint = "regular_table_col_bigint%s" %self.regular_col_base
+        self.col_smallint = "regular_table_col_smallint%s" %self.regular_col_base
+        self.col_tinyint = "regular_table_col_tinyint%s" %self.regular_col_base
+        self.col_bool = "regular_table_col_bool%s" %self.regular_col_base
+        self.col_binary = "regular_table_col_binary%s" %self.regular_col_base
+        self.col_nchar = "regular_table_col_nchar%s" %self.regular_col_base
+        self.col_float = "regular_table_col_float%s" %self.regular_col_base
+        self.col_double = "regular_table_col_double%s" %self.regular_col_base
+        self.col_ts = "regular_table_col_ts%s" %self.regular_col_base
+
+        tdSql.execute("create table `%s` (ts timestamp,`%s` int , `%s` bigint , `%s` smallint , `%s` tinyint, `%s` bool , \
+                    `%s` binary(20) , `%s` nchar(20) ,`%s` float , `%s` double , `%s` timestamp) ;"\
+                    %(self.regular_table, self.col_int, self.col_bigint, self.col_smallint, self.col_tinyint, self.col_bool, 
+                        self.col_binary, self.col_nchar, self.col_float, self.col_double, self.col_ts))
+        tdSql.query("describe `%s` ; "%self.regular_table)
+        tdSql.checkRows(11)
+
+        tdSql.query("select _block_dist() from `%s` ; " %self.regular_table)
+        tdSql.checkRows(1)
+
+        tdSql.query("show create table `%s` ; " %self.regular_table)
+        tdSql.checkData(0, 0, self.regular_table)
+        tdSql.checkData(0, 1, "create table `%s` (`ts` TIMESTAMP,`%s` INT,`%s` BIGINT,`%s` SMALLINT,`%s` TINYINT,`%s` BOOL,`%s` BINARY(20),`%s` NCHAR(20),`%s` FLOAT,`%s` DOUBLE,`%s` TIMESTAMP)" 
+                    %(self.regular_table, self.col_int, self.col_bigint, self.col_smallint, self.col_tinyint, self.col_bool, 
+                        self.col_binary, self.col_nchar, self.col_float, self.col_double, self.col_ts))
+
+        tdSql.execute("insert into `%s`  values(now, 1 , 2, 3, 4, 5, 6 ,7 ,8 ,9 ,10)" %self.regular_table)
+        sql = "select * from  `%s` ; " %self.regular_table
+        datacheck = self.table1_checkall(sql)
+        tdSql.checkRows(1)
+        sql = '''select ts ,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`,`%s` from  db2.`%s`; '''\
+                %(self.col_int, self.col_bigint, self.col_smallint, self.col_tinyint, self.col_bool, self.col_binary, self.col_nchar, self.col_float, self.col_double, self.col_ts, self.regular_table) 
+        datacheck = self.table1_checkall(sql)
+        tdSql.checkRows(1)
+
+        time.sleep(1)
+        tdSql.execute('''insert into db2.`%s` (ts ,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`) values(now, 1 , 2, 3, 4, 5, 6 ,7 ,8 ,9 ,10)'''\
+                %(self.regular_table, self.col_int, self.col_bigint, self.col_smallint, self.col_tinyint, self.col_bool, self.col_binary, self.col_nchar, self.col_float, self.col_double, self.col_ts) )        
+        sql = " select * from  db2.`%s`; " %self.regular_table
+        datacheck = self.table1_checkall(sql)
+        tdSql.checkRows(2)
+
+        sql = " select * from  db2.`%s` where `%s`=1 and `%s`=2 and `%s`=3 and `%s`=4 and `%s`='True' and `%s`=6 and `%s`=7 and `%s`=8 and `%s`=9 and `%s`=10; " \
+            %(self.regular_table, self.col_int, self.col_bigint, self.col_smallint, self.col_tinyint, self.col_bool, self.col_binary, self.col_nchar, self.col_float, self.col_double, self.col_ts)
+        datacheck = self.table1_checkall(sql)
+        tdSql.checkRows(2)
+
+        tdSql.query("select count(*) from  `%s`; " %self.regular_table)
+        tdSql.checkData(0, 0, 2)
+        tdSql.query("select _block_dist() from `%s` ; " %self.regular_table)
+        tdSql.checkRows(1)
+
+        sql = "select * from (select * from `%s`) ; "  %self.regular_table
+        datacheck = self.table1_checkall(sql)
+        tdSql.checkRows(2)
+
+        sql = "select ts ,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`,`%s` from (select ts ,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`,`%s`,`%s` from db2.`%s`\
+                    where `%s`=1 and `%s`=2 and `%s`=3 and `%s`=4 and `%s`='True' and `%s`=6 and `%s`=7 and `%s`=8 and `%s`=9 and `%s`=10 ) ; " \
+                    %(self.col_int, self.col_bigint, self.col_smallint, self.col_tinyint, self.col_bool, self.col_binary, self.col_nchar, self.col_float, self.col_double, self.col_ts,\
+                    self.col_int, self.col_bigint, self.col_smallint, self.col_tinyint, self.col_bool, self.col_binary, self.col_nchar, self.col_float, self.col_double, self.col_ts, self.regular_table, \
+                    self.col_int, self.col_bigint, self.col_smallint, self.col_tinyint, self.col_bool, self.col_binary, self.col_nchar, self.col_float, self.col_double, self.col_ts)
+        datacheck = self.table1_checkall(sql)
+        tdSql.checkRows(2)
+        
+        tdSql.query("select count(*) from (select * from `%s` ); "  %self.regular_table)
+        tdSql.checkData(0, 0, 2)
+
+        tdSql.query("show tables like 'regular_table%' ")
+        tdSql.checkRows(1)
+
+        self.crr_tb = "create_r_table~!@#$%^&*()-_+=[]{}';:,<.>/?stST24680~!@#$%^&*()-_+=[]{}"
+        tdSql.execute("create table `%s` as select * from `%s` ;" %(self.crr_tb,self.regular_table))
+        tdSql.query("show db2.tables like 'create_r_table%' ")
+        tdSql.checkRows(1)
+
+
+        print("==============drop\ add\ change\ modify column ")
+        print("==============drop==============")
+        tdSql.execute("ALTER TABLE db2.`%s` DROP COLUMN `%s`; " %(self.regular_table, self.col_ts))
+        sql = " select * from  db2.`%s`; " %self.regular_table
+        datacheck = self.table1_checkall_9(sql)
+        tdSql.query("describe db2.`%s` ; " %self.regular_table)
+        tdSql.checkRows(10)
+        tdSql.execute("ALTER TABLE `%s` DROP COLUMN `%s`; " %(self.regular_table, self.col_double))
+        sql = " select * from  `%s`; " %self.regular_table
+        datacheck = self.table1_checkall_8(sql)
+        tdSql.query("describe `%s` ; " %self.regular_table)
+        tdSql.checkRows(9)
+        tdSql.execute("ALTER TABLE db2.`%s` DROP COLUMN `%s`; " %(self.regular_table, self.col_float))
+        sql = " select * from  db2.`%s`; " %self.regular_table
+        datacheck = self.table1_checkall_7(sql)
+        tdSql.query("describe db2.`%s` ; " %self.regular_table)
+        tdSql.checkRows(8)
+        tdSql.execute("ALTER TABLE `%s` DROP COLUMN `%s`; " %(self.regular_table, self.col_nchar))
+        sql = " select * from  `%s`; " %self.regular_table
+        datacheck = self.table1_checkall_6(sql)
+        tdSql.query("describe `%s` ; " %self.regular_table)
+        tdSql.checkRows(7)
+        tdSql.execute("ALTER TABLE db2.`%s` DROP COLUMN `%s`; " %(self.regular_table, self.col_binary))
+        sql = " select * from  db2.`%s`; " %self.regular_table
+        datacheck = self.table1_checkall_5(sql)
+        tdSql.query("describe db2.`%s` ; " %self.regular_table)
+        tdSql.checkRows(6)
+        tdSql.execute("ALTER TABLE `%s` DROP COLUMN `%s`; " %(self.regular_table, self.col_bool))
+        sql = " select * from  `%s`; " %self.regular_table
+        datacheck = self.table1_checkall_4(sql)
+        tdSql.query("describe `%s` ; " %self.regular_table)
+        tdSql.checkRows(5)
+        tdSql.execute("ALTER TABLE db2.`%s` DROP COLUMN `%s`; " %(self.regular_table, self.col_tinyint))
+        sql = " select * from  db2.`%s`; " %self.regular_table
+        datacheck = self.table1_checkall_3(sql)
+        tdSql.query("describe db2.`%s` ; " %self.regular_table)
+        tdSql.checkRows(4)
+        tdSql.execute("ALTER TABLE `%s` DROP COLUMN `%s`; " %(self.regular_table, self.col_smallint))
+        sql = " select * from  `%s`; " %self.regular_table
+        datacheck = self.table1_checkall_2(sql)
+        tdSql.query("describe `%s` ; " %self.regular_table)
+        tdSql.checkRows(3)
+        tdSql.execute("ALTER TABLE db2.`%s` DROP COLUMN `%s`; " %(self.regular_table, self.col_bigint))
+        sql = " select * from  db2.`%s`; " %self.regular_table
+        datacheck = self.table1_checkall_1(sql)
+        tdSql.query("describe db2.`%s` ; " %self.regular_table)
+        tdSql.checkRows(2)
+        tdSql.error("ALTER TABLE db2.`%s` DROP COLUMN `%s`; " %(self.regular_table, self.col_int))
+        tdSql.query("describe `%s` ; " %self.regular_table)
+        tdSql.checkRows(2)
+
+        print("==============add==============")
+        tdSql.execute("ALTER TABLE db2.`%s` ADD COLUMN `%s` bigint; " %(self.regular_table, self.col_bigint))
+        tdSql.query("describe db2.`%s` ; " %self.regular_table)
+        tdSql.checkRows(3)
+        tdSql.execute("ALTER TABLE db2.`%s` ADD COLUMN `%s` smallint; " %(self.regular_table, self.col_smallint))
+        tdSql.query("describe db2.`%s` ; " %self.regular_table)
+        tdSql.checkRows(4)
+        tdSql.execute("ALTER TABLE db2.`%s` ADD COLUMN `%s` tinyint; " %(self.regular_table, self.col_tinyint))
+        tdSql.query("describe db2.`%s` ; " %self.regular_table)
+        tdSql.checkRows(5)
+        tdSql.execute("ALTER TABLE db2.`%s` ADD COLUMN `%s` bool; " %(self.regular_table, self.col_bool))
+        tdSql.query("describe db2.`%s` ; " %self.regular_table)
+        tdSql.checkRows(6)
+        tdSql.execute("ALTER TABLE db2.`%s` ADD COLUMN `%s` binary(20); " %(self.regular_table, self.col_binary))
+        tdSql.query("describe db2.`%s` ; " %self.regular_table)
+        tdSql.checkRows(7)
+
+        tdSql.execute("insert into db2.`%s`  values(now, 1 , 2, 3, 4, 5, 6)" %self.regular_table)       
+        sql = "select * from  db2.`%s` order by ts desc; " %self.regular_table
+        datacheck = self.table1_checkall_5(sql)
+
+        tdSql.execute("ALTER TABLE db2.`%s` ADD COLUMN `%s` nchar(20); " %(self.regular_table, self.col_nchar))
+        tdSql.query("describe db2.`%s` ; " %self.regular_table)
+        tdSql.checkRows(8)
+        tdSql.execute("ALTER TABLE db2.`%s` ADD COLUMN `%s` float; " %(self.regular_table, self.col_float))
+        tdSql.query("describe db2.`%s` ; " %self.regular_table)
+        tdSql.checkRows(9)
+        tdSql.execute("ALTER TABLE db2.`%s` ADD COLUMN `%s` double; " %(self.regular_table, self.col_double))
+        tdSql.query("describe db2.`%s` ; " %self.regular_table)
+        tdSql.checkRows(10)
+        tdSql.execute("ALTER TABLE db2.`%s` ADD COLUMN `%s` timestamp; " %(self.regular_table, self.col_ts))
+        tdSql.query("describe db2.`%s` ; " %self.regular_table)
+        tdSql.checkRows(11)
+
+        tdSql.execute("insert into db2.`%s`  values(now, 1 , 2, 3, 4, 5, 6 ,7 ,8 ,9 ,10)" %self.regular_table)       
+        sql = "select * from  db2.`%s` order by ts desc; " %self.regular_table
+        datacheck = self.table1_checkall(sql)
+
+
+        print("==============change, regular not support==============")
+        
+
+        print("==============modify==============")
+        # TD-10810
+        tdSql.execute("ALTER TABLE db2.`%s` MODIFY COLUMN `%s` binary(30); ; " %(self.regular_table, self.col_binary))
+        sql = " select * from  db2.`%s` order by ts desc; " %self.regular_table
+        datacheck = self.table1_checkall(sql)
+        tdSql.query("describe db2.`%s` ; " %self.regular_table)
+        tdSql.checkRows(11)    
+        tdSql.execute("ALTER TABLE `%s` MODIFY COLUMN `%s` nchar(30); ; " %(self.regular_table, self.col_nchar))
+        sql = " select * from  `%s` order by ts desc; " %self.regular_table
+        datacheck = self.table1_checkall(sql)
+        tdSql.query("describe `%s` ; " %self.regular_table)
+        tdSql.checkRows(11)  
+
+
+        assert os.system("taosdump -D db") == 0
+        assert os.system("taosdump -D db2") == 0
+
+        assert os.system("taosdump -i . -g") == 0
+        
+
+    def stop(self):
+        tdSql.close()
+        tdLog.success("%s successfully executed" % __file__)
+
+
+tdCases.addWindows(__file__, TDTestCase())
+tdCases.addLinux(__file__, TDTestCase())