[TS-1159]<fix>: added test case

tests/pytest/alter/alterBackQuoteCol.py

+
+# -*- coding: utf-8 -*-
+
+import random
+import string
+import subprocess
+import sys
+from util.log import *
+from util.cases import *
+from util.sql import *
+
+
+class TDTestCase:
+    def init(self, conn, logSql):
+        tdLog.debug("start to execute %s" % __file__)
+        tdSql.init(conn.cursor(), logSql)
+    def run(self):
+        tdLog.debug("check databases")
+        tdSql.prepare()
+ 
+        tdSql.execute("create database if not exists db")
+        tdSql.execute("use db")
+        tdSql.execute("create stable `sch.job.create` (`ts` TIMESTAMP,`value` DOUBLE) TAGS (`endpoint` NCHAR(7),`task.type` NCHAR(3))")
+        tdSql.execute("alter table `sch.job.create` modify tag `task.type` NCHAR(4)")
+        tdSql.execute("drop database db") 
+
+    def stop(self):
+        tdSql.close()
+        tdLog.success("%s successfully executed" % __file__)
+
+
+tdCases.addWindows(__file__, TDTestCase())
+tdCases.addLinux(__file__, TDTestCase())