[TD-4421]<test>: add test case for subquery with filter

tests/pytest/fulltest.sh

@@ -229,7 +229,7 @@ python3 ./test.py -f query/queryFilterTswithDateUnit.py
 python3 ./test.py -f query/queryTscomputWithNow.py
 python3 ./test.py -f query/computeErrorinWhere.py
 python3 ./test.py -f query/queryTsisNull.py
-
+python3 ./test.py -f query/subqueryFilter.py
 
 
 #stream

tests/pytest/query/subqueryFilter.py

@@ -0,0 +1,79 @@
+###################################################################
+#           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
+from util.log import tdLog
+from util.cases import tdCases
+from util.sql import tdSql
+from util.dnodes import tdDnodes
+
+class TDTestCase:
+    def init(self, conn, logSql):
+        tdLog.debug("start to execute %s" % __file__)
+        tdSql.init(conn.cursor(), logSql)
+
+        self.ts = 1601481600000
+        self.tables = 10
+        self.perfix = 'dev'
+    
+    def insertData(self):
+        print("==============step1")
+        tdSql.execute(
+            "create table if not exists st (ts timestamp, tagtype int) tags(dev nchar(50))")
+        
+        for i in range(self.tables):
+            tdSql.execute("create table %s%d using st tags(%d)" % (self.perfix, i, i))
+            rows = 15 + i
+            for j in range(rows):                
+                tdSql.execute("insert into %s%d values(%d, %d)" %(self.perfix, i, self.ts + i * 20 * 10000 + j * 10000, j))  
+
+    def run(self):
+        tdSql.prepare()
+
+        self.insertData()
+
+        tdSql.query("select count(*) val from st group by tbname")
+        tdSql.checkRows(10)
+
+        tdSql.query("select * from (select count(*) val from st group by tbname)")
+        tdSql.checkRows(10)
+
+        tdSql.query("select * from (select count(*) val from st group by tbname) a where a.val < 20")
+        tdSql.checkRows(5)
+
+        tdSql.query("select * from (select count(*) val from st group by tbname) a where a.val > 20")
+        tdSql.checkRows(4)
+
+        tdSql.query("select * from (select count(*) val from st group by tbname) a where a.val = 20")
+        tdSql.checkRows(1)
+
+        tdSql.query("select * from (select count(*) val from st group by tbname) a where a.val <= 20")
+        tdSql.checkRows(6)
+
+        tdSql.query("select * from (select count(*) val from st group by tbname) a where a.val >= 20")
+        tdSql.checkRows(5)
+
+        tdSql.query("select count(*) from (select first(tagtype) val from st interval(30s)) a where a.val > 20")
+        tdSql.checkRows(1)
+        tdSql.checkData(0, 0, 1)
+        
+        
+
+    def stop(self):
+        tdSql.close()
+        tdLog.success("%s successfully executed" % __file__)
+
+
+tdCases.addWindows(__file__, TDTestCase())
+tdCases.addLinux(__file__, TDTestCase())