[TD-12275]<test>(query): add case for crash about long query

tests/system-test/2-query/TD-12275.py

+###################################################################
+#           Copyright (c) 2020 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 -*-
+
+from posixpath import split
+import sys
+import os 
+
+from util.log import *
+from util.cases import *
+from util.sql import *
+from util.dnodes import *
+import subprocess
+
+class TDTestCase:
+    def init(self, conn, logSql):
+        tdLog.debug("start to execute %s" % __file__)
+        tdSql.init(conn.cursor(), logSql)
+
+    def getBuildPath(self):
+        selfPath = os.path.dirname(os.path.realpath(__file__))
+
+        if ("community" in selfPath):
+            projPath = selfPath[:selfPath.find("community")]
+        else:
+            projPath = selfPath[:selfPath.find("tests")]
+
+        for root, dirs, files in os.walk(projPath):
+            if ("taosd" in files):
+                rootRealPath = os.path.dirname(os.path.realpath(root))
+                if ("packaging" not in rootRealPath):
+                    buildPath = root[:len(root) - len("/build/bin")]
+                    break
+        return buildPath
+
+
+    def caseDescription(self):
+
+        '''
+        case1 <author>:wenzhouwww [TD-12275] : 
+            this test case is an long query crash for elapsed function  .
+        ''' 
+        return 
+   
+    def run(self):
+        tdSql.prepare()
+        build_path = self.getBuildPath()+"/build/bin/"
+        prepare_cmd = "%staosBenchmark -t 100 -n 100000 -S 10000 -y " % (build_path)
+
+        # only taos -s for shell can generate this issue 
+        print(prepare_cmd)
+        _ = subprocess.check_output(prepare_cmd, shell=True).decode("utf-8")
+        cmd1 = "taos -s 'select elapsed(ts) from test.meters interval(10s) sliding(5s) group by tbname' "
+        print(cmd1)
+        _ = subprocess.check_output(cmd1, shell=True).decode("utf-8")
+        
+        
+
+    def stop(self):
+        tdSql.close()
+        tdLog.success("%s successfully executed" % __file__)
+
+tdCases.addWindows(__file__, TDTestCase())
+tdCases.addLinux(__file__, TDTestCase())