[TD-5816]<test>: add testcase alter/alterColMultiTimes.py for TD-5816

fix a small-probability bug for insert/schemalessInsert.py

tests/pytest/alter/alterColMultiTimes.py

+###################################################################
+#           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 random
+import string
+from util.log import *
+from util.cases import *
+from util.sql import *
+from util.dnodes import *
+
+class TDTestCase:
+    def init(self, conn, logSql):
+        tdLog.debug("start to execute %s" % __file__)
+        tdSql.init(conn.cursor(), logSql)
+
+    def genColList(self):
+        '''
+            generate column list
+        '''
+        col_list = list()
+        for i in range(1, 18):
+            col_list.append(f'c{i}')
+        return col_list
+
+    def genIncreaseValue(self, input_value):
+        '''
+            add ', 1' to end of value every loop
+        '''
+        value_list = list(input_value)
+        value_list.insert(-1, ", 1")
+        return ''.join(value_list)
+
+    def insertAlter(self):
+        '''
+            after each alter and insert, when execute 'select * from {tbname};' taosd will coredump
+        '''
+        tbname = ''.join(random.choice(string.ascii_letters.lower()) for i in range(7))
+        input_value = '(now, 1)'
+        tdSql.execute(f'create table {tbname} (ts timestamp, c0 int);')
+        tdSql.execute(f'insert into  {tbname} values {input_value};')
+        for col in self.genColList():
+            input_value = self.genIncreaseValue(input_value)
+            tdSql.execute(f'alter table {tbname} add column {col} int;')
+            tdSql.execute(f'insert into {tbname} values {input_value};')
+        tdSql.query(f'select * from {tbname};')
+        tdSql.checkRows(18)
+            
+    def run(self):
+        tdSql.prepare()
+        self.insertAlter()
+
+    def stop(self):
+        tdSql.close()
+        tdLog.success("%s successfully executed" % __file__)
+
+tdCases.addWindows(__file__, TDTestCase())
+tdCases.addLinux(__file__, TDTestCase())

tests/pytest/fulltest.sh

@@ -380,6 +380,7 @@ python3 ./test.py -f query/querySession.py
 python3 test.py -f  alter/alter_create_exception.py
 python3 ./test.py -f insert/flushwhiledrop.py
 python3 ./test.py -f insert/schemalessInsert.py
+python3 ./test.py -f alter/alterColMultiTimes.py 
 
 #======================p4-end===============
 python3 test.py -f  tools/taosdemoAllTest/pytest.py

tests/pytest/insert/schemalessInsert.py

@@ -705,7 +705,7 @@ class TDTestCase:
             case no id when stb exist
         """
         self.cleanStb()
-        input_sql, stb_name = self.genFullTypeSql(t0="f", c0="f")
+        input_sql, stb_name = self.genFullTypeSql(tb_name="sub_table_0123456", t0="f", c0="f")
         self.resCmp(input_sql, stb_name)
         input_sql, stb_name = self.genFullTypeSql(stb_name=stb_name, id_noexist_tag=True, t0="f", c0="f")
         self.resCmp(input_sql, stb_name, condition='where tbname like "t_%"')