Merge pull request #7863 from taosdata/xiaoping/test_case

[TS-337]<test>: add test case for interp function returns empty result

tests/pytest/functions/function_interp.py

@@ -12,6 +12,7 @@
 # -*- coding: utf-8 -*-
 
 import sys
+from util.dnodes import *
 import taos
 from util.log import *
 from util.cases import *
@@ -25,7 +26,7 @@ class TDTestCase:
         tdSql.init(conn.cursor())
 
         self.rowNum = 10
-        self.ts = 1537146000000
+        self.ts = 1537100000000
 
     def run(self):
         tdSql.prepare()
@@ -90,6 +91,30 @@ class TDTestCase:
         tdSql.error("select interp(*) from ap1 ts <= '2021-07-25 02:19:54' FILL(NEXT)")
         tdSql.error("select interp(*) from ap1 where ts >'2021-07-25 02:19:59.938' and ts < now every(1s) fill(next)")
 
+        # test case for https://jira.taosdata.com:18080/browse/TS-241
+        tdSql.execute("create database test minrows 10")
+        tdSql.execute("use test")
+        tdSql.execute("create table st(ts timestamp, c1 int) tags(id int)")
+        tdSql.execute("create table t1 using st tags(1)")
+
+        for i in range(10):            
+            for j in range(10):
+                tdSql.execute("insert into t1 values(%d, %d)" % (self.ts + i * 3600000 + j, j))
+            tdSql.query("select interp(c1) from st where ts >= '2018-09-16 20:00:00.000' and ts <= '2018-09-17 06:00:00.000' every(1h) fill(linear)")
+            if i==0:
+                tdSql.checkRows(0)
+            else:
+                tdSql.checkRows(11)
+            
+            tdDnodes.stop(1)
+            tdDnodes.start(1)
+            tdSql.query("select interp(c1) from st where ts >= '2018-09-16 20:00:00.000' and ts <= '2018-09-17 06:00:00.000' every(1h) fill(linear)")            
+            if i==0:
+                tdSql.checkRows(0)
+            else:
+                tdSql.checkRows(11)
+
+
     def stop(self):
         tdSql.close()
         tdLog.success("%s successfully executed" % __file__)