diff --git a/tests/system-test/5-taos-tools/taosdump/TD-12435.py b/tests/system-test/5-taos-tools/taosdump/TD-12435.py
deleted file mode 100644
index 8f513ee8561bbe85687cf315cf091696d38d6b51..0000000000000000000000000000000000000000
--- a/tests/system-test/5-taos-tools/taosdump/TD-12435.py
+++ /dev/null
@@ -1,829 +0,0 @@
-###################################################################
-#           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 -y") == 0
-        assert os.system("taosdump -D db2 -y") == 0
-
-        assert os.system("taosdump -i . -g -y") == 0
-        
-
-    def stop(self):
-        tdSql.close()
-        tdLog.success("%s successfully executed" % __file__)
-
-
-tdCases.addWindows(__file__, TDTestCase())
-tdCases.addLinux(__file__, TDTestCase())