[TD-5038] test case for flushing while drop database

tests/pytest/fulltest.sh

@@ -361,4 +361,6 @@ python3 test.py -f alter/alter_keep.py
 python3 test.py -f alter/alter_cacheLastRow.py
 python3 ./test.py -f query/querySession.py 
 python3 test.py -f  alter/alter_create_exception.py
+
+python3 ./test.py -f insert/flushwhiledrop.py
 #======================p4-end===============

tests/pytest/insert/flushwhiledrop.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 threading
+from util.log import *
+from util.cases import *
+from util.sql import *
+from time import sleep
+
+
+class TDTestCase:
+    def init(self, conn, logSql):
+        tdLog.debug("start to execute %s" % __file__)
+        tdSql.init(conn.cursor(), logSql)
+        self.numberOfRecords = 15000
+        self.ts = 1601481600000
+
+    def run(self):
+        tdSql.execute('create database test cache 1 blocks 3')
+        tdSql.execute('use test')
+        tdSql.execute('create table tb(ts timestamp, c1 timestamp, c2 int, c3 bigint, c4 float, c5 double, c6 binary(8), c7 smallint, c8 tinyint, c9 bool, c10 nchar(8))')
+        threads = []
+        t1 = threading.Thread(target=self.insertAndFlush, args=())
+        threads.append(t1)
+        t2 = threading.Thread(target=self.drop, args=())
+        threads.append(t2)
+        for t in threads:
+            t.setDaemon(True)
+            t.start()
+        for t in threads:
+            t.join() 
+
+    def insertAndFlush(self):
+        finish = 0
+        currts = self.ts
+
+        while(finish < self.numberOfRecords):
+            sql = "insert into tb values"
+            for i in range(finish, self.numberOfRecords):
+                sql += "(%d, 1019774612, 29931, 1442173978, 165092.468750, 1128.643179, 'MOCq1pTu', 18405, 82, 0, 'g0A6S0Fu')" % (currts + i)
+                finish = i + 1
+                if (1048576 - len(sql)) < 16384:
+                    break
+            tdSql.execute(sql)
+        
+    def drop(self):
+        sleep(30)
+        tdSql.execute('drop database test')
+
+    def stop(self):
+        tdSql.close()
+        tdLog.success("%s successfully executed" % __file__)
+
+
+tdCases.addWindows(__file__, TDTestCase())
+tdCases.addLinux(__file__, TDTestCase())
\ No newline at end of file