[TD-5338]<test>:test stable interval function

tests/pytest/query/queryInterval.py

@@ -73,6 +73,52 @@ class TDTestCase:
         tdSql.checkData(6, 0, "2020-09-16 00:00:00")
         tdSql.checkData(6, 1, 222.0)
 
+        # test case for https://jira.taosdata.com:18080/browse/TD-5338
+        tdSql.query("select loc,max(voltage) from st  interval(1m);")
+        tdSql.checkRows(8)
+        tdSql.checkData(0, 0, "2020-07-01 04:24:00.000")
+        tdSql.checkData(0, 1, "beijing")
+        tdSql.checkData(0, 2, 220)
+        tdSql.checkData(1, 0, "2020-07-12 18:11:00.000")
+        tdSql.checkData(1, 1, "beijing")
+        tdSql.checkData(1, 2, 221)
+        tdSql.checkData(2, 0, "2020-07-24 07:58:00.000")
+        tdSql.checkData(2, 1, "beijing")
+        tdSql.checkData(2, 2, 225)
+        tdSql.checkData(3, 0, "2020-08-04 21:44:00.000")
+        tdSql.checkData(2, 1, "beijing")
+        tdSql.checkData(3, 2, 228)
+        tdSql.checkData(4, 0, "2020-08-16 11:31:00.000")
+        tdSql.checkData(4, 1, "shanghai")
+        tdSql.checkData(4, 2, 225)
+        tdSql.checkData(5, 0, "2020-08-28 01:18:00.000")
+        tdSql.checkData(5, 1, "shanghai")
+        tdSql.checkData(5, 2, 228)
+        tdSql.checkData(6, 0, "2020-09-08 15:04:00.000")
+        tdSql.checkData(6, 1, "beijing")
+        tdSql.checkData(6, 2, 222)
+        tdSql.checkData(7, 0, "2020-09-20 04:51:00.000")
+        tdSql.checkData(7, 1, "shanghai")
+        tdSql.checkData(7, 2, 222)
+        tdSql.query("select loc,max(voltage) from t0  interval(1m);")
+        tdSql.checkRows(5)
+        tdSql.checkData(0, 0, "2020-07-01 04:24:00.000")
+        tdSql.checkData(0, 1, "beijing")
+        tdSql.checkData(0, 2, 220)
+        tdSql.checkData(1, 0, "2020-07-12 18:11:00.000")
+        tdSql.checkData(1, 1, "beijing")
+        tdSql.checkData(1, 2, 221)
+        tdSql.checkData(2, 0, "2020-07-24 07:58:00.000")
+        tdSql.checkData(2, 1, "beijing")
+        tdSql.checkData(2, 2, 225)
+        tdSql.checkData(3, 0, "2020-08-04 21:44:00.000")
+        tdSql.checkData(2, 1, "beijing")
+        tdSql.checkData(3, 2, 228)       
+        tdSql.checkData(4, 0, "2020-09-08 15:04:00.000")
+        tdSql.checkData(4, 1, "beijing")
+        tdSql.checkData(4, 2, 222)
+    
+
         # test case for https://jira.taosdata.com:18080/browse/TD-2298
         tdSql.execute("create database test keep 36500")
         tdSql.execute("use test")