diff --git a/tests/system-test/2-query/interp.py b/tests/system-test/2-query/interp.py
index bee20710b51c19448fe7a7563596976c4fe3d639..db2f8edc7d79a1734a95121e92633befa05bfd9b 100644
--- a/tests/system-test/2-query/interp.py
+++ b/tests/system-test/2-query/interp.py
@@ -32,6 +32,8 @@ class TDTestCase:
         tdSql.execute(f"insert into {dbname}.{tbname} values ('2020-02-01 00:00:05', 5, 5, 5, 5, 5.0, 5.0, true, 'varchar', 'nchar')")
         tdSql.execute(f"insert into {dbname}.{tbname} values ('2020-02-01 00:00:10', 10, 10, 10, 10, 10.0, 10.0, true, 'varchar', 'nchar')")
         tdSql.execute(f"insert into {dbname}.{tbname} values ('2020-02-01 00:00:15', 15, 15, 15, 15, 15.0, 15.0, true, 'varchar', 'nchar')")
+        
+        tdSql.execute(f"insert into {dbname}.{tbname} (ts) values (now)")
 
         tdLog.printNoPrefix("==========step3:fill null")
 
@@ -240,7 +242,7 @@ class TDTestCase:
 
         ## {. . .}
         tdSql.query(f"select interp(c0) from {dbname}.{tbname} range('2020-02-01 00:00:04', '2020-02-01 00:00:16') every(1s) fill(next)")
-        tdSql.checkRows(12)
+        tdSql.checkRows(13)
         tdSql.checkData(0, 0, 5)
         tdSql.checkData(1, 0, 5)
         tdSql.checkData(2, 0, 10)
@@ -290,21 +292,21 @@ class TDTestCase:
 
         ## ..{.}
         tdSql.query(f"select interp(c0) from {dbname}.{tbname} range('2020-02-01 00:00:13', '2020-02-01 00:00:17') every(1s) fill(next)")
-        tdSql.checkRows(3)
+        tdSql.checkRows(5)
         tdSql.checkData(0, 0, 15)
         tdSql.checkData(1, 0, 15)
         tdSql.checkData(2, 0, 15)
 
         ## ... {}
         tdSql.query(f"select interp(c0) from {dbname}.{tbname} range('2020-02-01 00:00:16', '2020-02-01 00:00:19') every(1s) fill(next)")
-        tdSql.checkRows(0)
+        tdSql.checkRows(4)
 
 
         tdLog.printNoPrefix("==========step7:fill linear")
 
         ## {. . .}
         tdSql.query(f"select interp(c0) from {dbname}.{tbname} range('2020-02-01 00:00:04', '2020-02-01 00:00:16') every(1s) fill(linear)")
-        tdSql.checkRows(11)
+        tdSql.checkRows(12)
         tdSql.checkData(0, 0, 5)
         tdSql.checkData(1, 0, 6)
         tdSql.checkData(2, 0, 7)
@@ -347,7 +349,7 @@ class TDTestCase:
 
         ## ..{.}
         tdSql.query(f"select interp(c0) from {dbname}.{tbname} range('2020-02-01 00:00:13', '2020-02-01 00:00:17') every(1s) fill(linear)")
-        tdSql.checkRows(3)
+        tdSql.checkRows(5)
         tdSql.checkData(0, 0, 13)
         tdSql.checkData(1, 0, 14)
         tdSql.checkData(2, 0, 15)
@@ -505,7 +507,7 @@ class TDTestCase:
         tdSql.checkData(8, 0, '2020-02-01 00:00:12.000')
 
         tdSql.query(f"select _irowts,interp(c0) from {dbname}.{tbname} range('2020-02-01 00:00:04', '2020-02-01 00:00:16') every(1s) fill(next)")
-        tdSql.checkRows(12)
+        tdSql.checkRows(13)
         tdSql.checkCols(2)
 
         tdSql.checkData(0, 0, '2020-02-01 00:00:04.000')
@@ -548,7 +550,7 @@ class TDTestCase:
         tdSql.checkData(8, 0, '2020-02-01 00:00:12.000')
 
         tdSql.query(f"select _irowts,interp(c0) from {dbname}.{tbname} range('2020-02-01 00:00:04', '2020-02-01 00:00:16') every(1s) fill(linear)")
-        tdSql.checkRows(11)
+        tdSql.checkRows(12)
         tdSql.checkCols(2)
 
         tdSql.checkData(0, 0, '2020-02-01 00:00:05.000')
@@ -576,7 +578,7 @@ class TDTestCase:
 
         # multiple _irowts
         tdSql.query(f"select interp(c0),_irowts from {dbname}.{tbname} range('2020-02-01 00:00:04', '2020-02-01 00:00:16') every(1s) fill(linear)")
-        tdSql.checkRows(11)
+        tdSql.checkRows(12)
         tdSql.checkCols(2)
 
         tdSql.checkData(0, 1, '2020-02-01 00:00:05.000')
@@ -592,7 +594,7 @@ class TDTestCase:
         tdSql.checkData(10, 1, '2020-02-01 00:00:15.000')
 
         tdSql.query(f"select _irowts, interp(c0), interp(c0), _irowts from {dbname}.{tbname} range('2020-02-01 00:00:04', '2020-02-01 00:00:16') every(1s) fill(linear)")
-        tdSql.checkRows(11)
+        tdSql.checkRows(12)
         tdSql.checkCols(4)
 
         cols = (0, 3)
@@ -851,6 +853,10 @@ class TDTestCase:
         tdSql.checkRows(3)
         tdSql.checkCols(4)
 
+        tdSql.query(f"select interp(c0),interp(c1),interp(c2),interp(c3),interp(c4),interp(c5) from {dbname}.{tbname} range('2020-02-09 00:00:05', '2020-02-13 00:00:05') every(1d) fill(linear)")
+        tdSql.checkRows(3)
+        tdSql.checkCols(6)
+        
         for i in range (tdSql.queryCols):
             tdSql.checkData(0, i, 13)