[TD-2801]<test>: add test case

tests/pytest/fulltest.sh

@@ -20,6 +20,7 @@ python3 insert/retentionpolicy.py
 python3 ./test.py -f insert/alterTableAndInsert.py
 python3 ./test.py -f insert/insertIntoTwoTables.py
 #python3 ./test.py -f insert/before_1970.py
+python3 ./test.py -f insert/metadataUpdate.py
 python3 bug2265.py
 
 #table

tests/pytest/insert/metadataUpdate.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 sys
+import taos
+from util.log import tdLog
+from util.cases import tdCases
+from util.sql import tdSql
+from util.dnodes import tdDnodes
+from multiprocessing import  Process
+
+class TDTestCase:
+    def init(self, conn, logSql):
+        tdLog.debug("start to execute %s" % __file__)
+        tdSql.init(conn.cursor(), logSql)
+
+        self.ts = 1538548685000
+
+    def updateMetadata(self):
+        self.host = "127.0.0.1"
+        self.user = "root"
+        self.password = "taosdata"
+        self.config = tdDnodes.getSimCfgPath()
+
+        self.conn = taos.connect(host = self.host, user = self.user, password = self.password, config = self.config)
+        self.cursor = self.conn.cursor()    
+        self.cursor.execute("alter table db.tb add column col2 int")
+        print("alter table done")
+
+    def run(self):
+        tdSql.prepare()
+
+        print("==============step1")
+        tdSql.execute("create table if not exists tb (ts timestamp, col1 int)")
+        tdSql.execute("insert into tb values(%d, 1)" % self.ts)
+
+        print("==============step2")
+        tdSql.query("select * from tb")
+        tdSql.checkRows(1)
+
+        p = Process(target=self.updateMetadata, args=())
+        p.start()        
+        p.join()
+        p.terminate()
+        
+        tdSql.execute("insert into tb values(%d, 1, 2)" % (self.ts + 1))
+
+        print("==============step2")
+        tdSql.query("select * from tb")
+        tdSql.checkRows(2)
+
+    def stop(self):
+        tdSql.close()
+        tdLog.success("%s successfully executed" % __file__)
+
+tdCases.addWindows(__file__, TDTestCase())
+tdCases.addLinux(__file__, TDTestCase())