add test case

tests/system-test/2-query/Timediff.py

@@ -4,6 +4,8 @@ from util.cases import *
 from util.gettime import *
 class TDTestCase:
 
+    updatecfgDict = {'keepColumnName': 1}
+
     def init(self, conn, logSql, replicaVar=1):
         self.replicaVar = int(replicaVar)
         tdLog.debug(f"start to excute {__file__}")
@@ -185,8 +187,16 @@ class TDTestCase:
             elif precision.lower() == 'ns':
                 for i in range(len(self.ts_str)):
                     tdSql.checkEqual(tdSql.queryResult[i][0],int(((date_time[i])-self.subtractor*1000000000)))
+    def function_multi_res_param(self):
+        tdSql.execute(f'drop database if exists {self.dbname}')
+        tdSql.execute(f'create database {self.dbname}')
+        tdSql.execute(f'use {self.dbname}')
+        tdSql.execute(f'create table {self.ntbname} (ts timestamp,c0 int)')
+        tdSql.execute(f'insert into {self.ntbname} values("2023-01-01 00:00:00",1)')
+        tdSql.execute(f'insert into {self.ntbname} values("2023-01-01 00:01:00",2)')
 
-
+        tdSql.query(f'select timediff(last(ts), first(ts)) from {self.ntbname}')
+        tdSql.checkData(0, 0, 60000)
 
 
 
@@ -194,6 +204,7 @@ class TDTestCase:
         self.function_check_ntb()
         self.function_check_stb()
         self.function_without_param()
+        self.function_multi_res_param()
 
     def stop(self):
         tdSql.close()