[TD-3181]<test>add testcase for TD-3170

tests/pytest/query/queryGroupbySort.py

@@ -28,12 +28,13 @@ class TDTestCase:
     def run(self):
         tdSql.prepare()
 
-        tdSql.execute("CREATE TABLE meters (ts timestamp, current float, voltage int, phase float) TAGS (location binary(64), groupId int)")
-        tdSql.execute("CREATE TABLE D1001 USING meters TAGS ('Beijing.Chaoyang', 2)")
-        tdSql.execute("CREATE TABLE D1002 USING meters TAGS ('Beijing.Chaoyang', 3)")
+        tdSql.execute("CREATE TABLE meters (ts timestamp, current float, voltage int, phase float) TAGS (location binary(64), groupId int, t3 float, t4 double)")
+        tdSql.execute("CREATE TABLE D1001 USING meters TAGS ('Beijing.Chaoyang', 2 , NULL, NULL)")
+        tdSql.execute("CREATE TABLE D1002 USING meters TAGS ('Beijing.Chaoyang', 3 , NULL , 1.7)")
+        tdSql.execute("CREATE TABLE D1003 USING meters TAGS ('Beijing.Chaoyang', 3 , 1.1 , 1.7)")
         tdSql.execute("INSERT INTO D1001 VALUES (1538548685000, 10.3, 219, 0.31) (1538548695000, 12.6, 218, 0.33) (1538548696800, 12.3, 221, 0.31)")
         tdSql.execute("INSERT INTO D1002 VALUES (1538548685001, 10.5, 220, 0.28)  (1538548696800, 12.3, 221, 0.31)")
-
+        tdSql.execute("INSERT INTO D1003 VALUES (1538548685001, 10.5, 220, 0.28)  (1538548696800, 12.3, 221, 0.31)")
         tdSql.query("SELECT SUM(current), AVG(voltage) FROM meters WHERE groupId > 1 INTERVAL(1s) GROUP BY location order by ts DESC")
         tdSql.checkRows(3)
         tdSql.checkData(0, 0, "2018-10-03 14:38:16")
@@ -49,6 +50,12 @@ class TDTestCase:
         tdSql.error("SELECT SUM(current) as s, AVG(voltage) FROM meters WHERE groupId > 1 INTERVAL(1s) GROUP BY location order by s ASC")
 
         tdSql.error("SELECT SUM(current) as s, AVG(voltage) FROM meters WHERE groupId > 1 INTERVAL(1s) GROUP BY location order by s DESC")
+
+        #add for TD-3170
+        tdSql.query("select avg(current) from meters group by t3;")
+        tdSql.checkData(0, 0, 11.6)
+        tdSql.query("select avg(current) from meters group by t4;")
+        tdSql.query("select avg(current) from meters group by t3,t4;")
         
     def stop(self):
         tdSql.close()