diff --git a/e2e_test/batch/types/timestamp_ns.slt.part b/e2e_test/batch/types/timestamp_ns.slt.part
index a5888d1e2f41..0f1b06df558d 100644
--- a/e2e_test/batch/types/timestamp_ns.slt.part
+++ b/e2e_test/batch/types/timestamp_ns.slt.part
@@ -14,12 +14,12 @@ select * from t1;
 2  2012-01-01 01:01:01.123456
 3  0001-01-01 01:01:01.123456789 BC
 4  2213-01-01 01:01:01.123456789
-5  null
+5  NULL
 
 query T
 select * from t1 where v1 is null;
 ----
-5 null
+5 NULL
 
 query T rowsort
 select v1, v2,
@@ -34,7 +34,7 @@ from t1;
 2  2012-01-01 01:01:01.123456        21st Century
 3  0001-01-01 01:01:01.123456789 BC  Before 2000
 4  2213-01-01 01:01:01.123456789     Future
-5  null                              Future
+5  NULL                              Future
 
 query T rowsort
 select v1, v2, coalesce(v2, '1900-01-01 00:00:00') as coalesce_v2 from t1;
@@ -43,7 +43,7 @@ select v1, v2, coalesce(v2, '1900-01-01 00:00:00') as coalesce_v2 from t1;
 2  2012-01-01 01:01:01.123456        2012-01-01 01:01:01.123456
 3  0001-01-01 01:01:01.123456789 BC  0001-01-01 01:01:01.123456789 BC
 4  2213-01-01 01:01:01.123456789     2213-01-01 01:01:01.123456789
-5  null                              1900-01-01 00:00:00
+5  NULL                              1900-01-01 00:00:00
 
 query T
 select count(v2) as total_rows from t1;
@@ -57,7 +57,7 @@ select * from t1 order by v2;
 2  2012-01-01 01:01:01.123456
 3  0001-01-01 01:01:01.123456789 BC
 4  2213-01-01 01:01:01.123456789
-5  null
+5  NULL
 
 query T rowsort
 select * from t1 where v2 >= '2012-01-01 01:01:01.123456';
@@ -73,7 +73,7 @@ select v1, cast(v2 as date) as date_v2, cast(v2 as timestamp with time zone) as
 2  2012-01-01     2012-01-01 01:01:01.123456+00:00
 3  0001-01-01 BC  0001-01-01 01:01:01.123456+00:00 BC
 4  2213-01-01     2213-01-01 01:01:01.123456+00:00
-5  null           null
+5  NULL           NULL
 
 query T rowsort
 select v1, date_trunc('day', v2) AS truncated_v2 from t1;
@@ -82,7 +82,7 @@ select v1, date_trunc('day', v2) AS truncated_v2 from t1;
 2  2012-01-01 00:00:00
 3  0001-01-01 00:00:00 BC
 4  2213-01-01 00:00:00
-5  null
+5  NULL
 
 query T rowsort
 select v1, v2 at time zone 'UTC' as v2_utc from t1;
@@ -91,7 +91,7 @@ select v1, v2 at time zone 'UTC' as v2_utc from t1;
 2  2012-01-01 01:01:01.123456+00:00
 3  0001-01-01 01:01:01.123456+00:00 BC
 4  2213-01-01 01:01:01.123456+00:00
-5  null
+5  NULL
 
 query T rowsort
 select v1, to_char(v2, 'YYYY-MM-DD HH24:MI:SS.NS') as formatted_v2 from t1;
@@ -100,7 +100,7 @@ select v1, to_char(v2, 'YYYY-MM-DD HH24:MI:SS.NS') as formatted_v2 from t1;
 2  2012-01-01 01:01:01.123456000
 3  0001-01-01 01:01:01.123456789 BC
 4  2213-01-01 01:01:01.123456789
-5  null
+5  NULL
 
 query T rowsort
 select generate_series('2013-01-01 01:01:01.123456789'::timestamp,'2013-01-01 01:01:05.123456790'::timestamp, '1 s');