TD-6129<feature> add python test file

tests/pytest/stable/json_tag.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, db_test.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
+
+
+class TDTestCase:
+
+    def init(self, conn, logSql):
+        tdLog.debug("start to execute %s" % __file__)
+        tdSql.init(conn.cursor(), logSql)
+
+    def run(self):
+        tdSql.prepare()
+
+        print("==============step1")
+        tdLog.info("create database and table")
+        tdSql.execute("create database db_json_tag_test")
+        tdSql.execute(
+            "create table if not exists db_json_tag_test.jsons1(ts timestamp, dataInt int, dataStr nchar(50)) tags(jtag json)")
+        tdSql.execute(
+            "CREATE TABLE if not exists db_json_tag_test.jsons1_1 using db_json_tag_test.jsons1 tags('{\"loc\":\"fff\",\"id\":5}')")
+        tdSql.execute(
+            "insert into jsons1_2 using db_json_tag_test.jsons1 tags('{\"num\":5,\"location\":\"beijing\"}' values (now, 1, 'sss')")
+
+        print("==============step2")
+        tdLog.info("select table")
+
+        tdSql.query("select * from db_json_tag_test.jsons1")
+        tdSql.checkRows(1)
+
+        tdSql.query("select jtag from db_json_tag_test.jsons1_1")
+        tdSql.checkRows(1)
+
+        print("==============step3")
+        tdLog.info("alter stable add tag")
+        tdSql.execute(
+            "ALTER STABLE db_json_tag_test.jsons1 add COLUMN tag2 nchar(20)")
+
+        tdSql.execute(
+            "ALTER STABLE db_json_tag_test.jsons1 drop COLUMN jtag")
+
+    def stop(self):
+        tdSql.close()
+        tdLog.success("%s successfully executed" % __file__)
+
+
+tdCases.addWindows(__file__, TDTestCase())
+tdCases.addLinux(__file__, TDTestCase())