[TD-1329]<test> add test case for incorrect count query

tests/pytest/queryCount.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
+import threading
+from util.log import *
+from util.cases import *
+from util.sql import *
+from util.dnodes import *
+
+
+class QueryCountMultiThread:
+    def initConnection(self):        
+        self.records = 10000000
+        self.numOfTherads = 50
+        self.ts = 1537146000000
+        self.host = "127.0.0.1"
+        self.user = "root"
+        self.password = "taosdata"
+        self.config = "/home/xp/git/TDengine/sim/dnode1/cfg"
+        self.conn = taos.connect(
+            self.host,
+            self.user,
+            self.password,
+            self.config)
+
+    def insertData(self, threadID):
+        cursor = self.conn.cursor()
+        print("Thread %d: starting" % threadID)
+        base = 200000 * threadID
+        for i in range(200):                        
+            query = "insert into tb values"
+            for j in range(1000):
+                query += "(%d, %d, 'test')" % (self.ts + base + i * 1000 + j, base + i * 1000 + j)                        
+            cursor.execute(query)            
+        cursor.close()
+        print("Thread %d: finishing" % threadID)
+
+    def run(self):
+        tdDnodes.init("")
+        tdDnodes.setTestCluster(False)
+        tdDnodes.setValgrind(False)
+
+        tdDnodes.stopAll()
+        tdDnodes.deploy(1)
+        tdDnodes.start(1)
+        
+        cursor = self.conn.cursor()
+        cursor.execute("drop database if exists db")
+        cursor.execute("create database db")
+        cursor.execute("use db")
+        cursor.execute("create table tb (ts timestamp, id int, name nchar(30))")
+        cursor.close()
+
+        threads = []
+        for i in range(50):
+            thread = threading.Thread(target=self.insertData, args=(i,))
+            threads.append(thread)
+            thread.start()            
+        
+        for i in range(50):
+            threads[i].join()
+
+        cursor = self.conn.cursor()
+        cursor.execute("use db")
+        sql = "select count(*) from tb"
+        cursor.execute(sql)
+        data = cursor.fetchall()
+
+        if(data[0][0] == 10000000):
+            tdLog.info("sql:%s, row:%d col:%d data:%d == expect:%d" % (sql, 0, 0, data[0][0], 10000000))
+        else:
+            tdLog.exit("sql:%s, row:%d col:%d data:%d == expect:%d" % (sql, 0, 0, data[0][0], 10000000))        
+
+        cursor.close()
+        self.conn.close()
+
+q = QueryCountMultiThread()
+q.initConnection()
+q.run()
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