diff --git a/tests/pytest/functions/function_operations.py b/tests/pytest/functions/function_operations.py
index 8bbe6dc9a34b54ef1ddecff4e3f186312e5235b1..e703147b6722f848263f170b89ce9f972f7a2435 100644
--- a/tests/pytest/functions/function_operations.py
+++ b/tests/pytest/functions/function_operations.py
@@ -69,15 +69,37 @@ class TDTestCase:
         tdSql.checkData(10, 0, None)
 
         # test for  tarithoperator.c coverage
-        col_list = [ 'col1' , 'col2' , 'col3' , 'col4' , 'col5' , 'col6' , 'col11' , 'col12' , 'col13' , 'col14' , '1' ]
+        tdSql.execute("insert into test1 values(1537146000010,1,NULL,9,8,1.2,1.3,0,1,1,5,4,3,2)")
+        tdSql.execute("insert into test1 values(1537146000011,2,1,NULL,9,1.2,1.3,1,2,2,6,5,4,3)")
+        tdSql.execute("insert into test1 values(1537146000012,3,2,1,NULL,1.2,1.3,0,3,3,7,6,5,4)")
+        tdSql.execute("insert into test1 values(1537146000013,4,3,2,1,1.2,1.3,1,4,4,8,7,6,5)")
+        tdSql.execute("insert into test1 values(1537146000014,5,4,3,2,1.2,1.3,0,5,5,9,8,7,6)")
+        tdSql.execute("insert into test1 values(1537146000015,6,5,4,3,1.2,1.3,1,6,6,NULL,9,8,7)")
+        tdSql.execute("insert into test1 values(1537146000016,7,6,5,4,1.2,1.3,0,7,7,1,NULL,9,8)")
+        tdSql.execute("insert into test1 values(1537146000017,8,7,6,5,1.2,1.3,1,8,8,2,1,NULL,9)")
+        tdSql.execute("insert into test1 values(1537146000018,9,8,7,6,1.2,1.3,0,9,9,3,2,1,NULL)")
+        tdSql.execute("insert into test1 values(1537146000019,NULL,9,8,7,1.2,1.3,1,10,10,4,3,2,1)")
+
+        self.ts = self.ts + self.rowNum + 10
+
+        tdSql.execute("insert into test1 values(%d, 1, 1, 1, 1, 1.1, 1.1, 1, NULL, '涛思数据3', 1, 1, 1, 1)"  % (  self.ts + self.rowNum + 1 ))
+        tdSql.execute("insert into test1 values(%d, 1, 1, 1, 1, 1.1, 1.1, 1, 'taosdata', NULL, 1, 1, 1, 1)"  % (  self.ts + self.rowNum + 2 ))
+        tdSql.execute("insert into test1 values(%d, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL)"  % (  self.ts + self.rowNum + 3 ))
+        tdSql.execute("insert into test1 values(%d, 1, 1, 1, 1, NULL, 1.1, 1, NULL, '涛思数据3', 1, 1, 1, 1)"  % (  self.ts + self.rowNum + 4 ))
+        tdSql.execute("insert into test1 values(%d, 1, 1, 1, 1, 1.1, NULL, 1, 'taosdata', NULL, 1, 1, 1, 1)"  % (  self.ts + self.rowNum + 5 ))
+        self.rowNum = self.rowNum + 5
+
+        col_list = [ 'col1' , 'col2' , 'col3' , 'col4' , 'col5' , 'col6' , 'col7' , 'col8' , 'col9' , 'col11' , 'col12' , 'col13' , 'col14' , '1' , '1.1' , 'NULL' ]
         op_list = [ '+' , '-' , '*' , '/' , '%' ]
+        err_list = [ 'col7' , 'col8' , 'col9' , 'NULL' ]
         for i in col_list :
             for j in col_list :
                 for k in op_list :
                     sql = " select %s %s %s from test1 " % ( i , k , j )
-                    print(sql)
-                    tdSql.query(sql)
-
+                    if i in err_list or j in err_list:
+                        tdSql.error(sql)
+                    else:
+                        tdSql.query(sql)
     def stop(self):
         tdSql.close()
         tdLog.success("%s successfully executed" % __file__)