diff --git a/test/expected/basic_usage.out b/test/expected/basic_usage.out
index 7826867..8d7bfb4 100644
--- a/test/expected/basic_usage.out
+++ b/test/expected/basic_usage.out
@@ -140,9 +140,15 @@ SELECT COUNT(*) < 10 AS fewer_partitions FROM ts_part_info;
 CREATE TABLE events (
   user_id bigint,
   event_id bigint,
-  event_time timestamptz,
+  event_time timestamptz NOT NULL,
   value float
-);
+) PARTITION BY RANGE (event_time);
+SELECT enable_ts_table('events');
+ enable_ts_table 
+-----------------
+ 
+(1 row)
+
 COPY events FROM STDIN WITH (FORMAT 'csv');
 SELECT first(value, event_time), user_id FROM events GROUP BY user_id;
  first | user_id 
@@ -172,3 +178,25 @@ SELECT last(event_id, event_time), user_id FROM events GROUP BY user_id;
     6 |       1
 (2 rows)
 
+SELECT last(user_id, value) top_performer,
+       locf(avg(value)) OVER (ORDER BY event_time),
+       event_time
+FROM date_bin_table(NULL::events, '1 minute',
+                    '[2020-11-04 15:50:00-08, 2020-11-04 16:00:00-08]')
+GROUP BY 3
+ORDER BY 3;
+ top_performer |        locf        |          event_time          
+---------------+--------------------+------------------------------
+               |                    | Wed Nov 04 15:50:00 2020 PST
+             2 |                1.4 | Wed Nov 04 15:51:00 2020 PST
+               |                1.4 | Wed Nov 04 15:52:00 2020 PST
+             2 |                1.5 | Wed Nov 04 15:53:00 2020 PST
+               |                1.5 | Wed Nov 04 15:54:00 2020 PST
+             2 |                1.6 | Wed Nov 04 15:55:00 2020 PST
+               |                1.6 | Wed Nov 04 15:56:00 2020 PST
+             2 |                1.7 | Wed Nov 04 15:57:00 2020 PST
+             2 |                1.8 | Wed Nov 04 15:58:00 2020 PST
+             2 | 1.9000000000000001 | Wed Nov 04 15:59:00 2020 PST
+               | 1.9000000000000001 | Wed Nov 04 16:00:00 2020 PST
+(11 rows)
+
diff --git a/test/sql/basic_usage.sql b/test/sql/basic_usage.sql
index 47d3d03..81a5a04 100644
--- a/test/sql/basic_usage.sql
+++ b/test/sql/basic_usage.sql
@@ -52,20 +52,21 @@ SELECT COUNT(*) < 10 AS fewer_partitions FROM ts_part_info;
 CREATE TABLE events (
   user_id bigint,
   event_id bigint,
-  event_time timestamptz,
+  event_time timestamptz NOT NULL,
   value float
-);
+) PARTITION BY RANGE (event_time);
+SELECT enable_ts_table('events');
 
 COPY events FROM STDIN WITH (FORMAT 'csv');
-1,1,"2020-11-04 15:54:02.226999-08",1.1
-1,2,"2020-11-04 15:55:02.226999-08",1.2
-1,3,"2020-11-04 15:56:02.226999-08",1.3
+1,1,"2020-11-04 15:51:02.226999-08",1.1
+1,2,"2020-11-04 15:53:02.226999-08",1.2
+1,3,"2020-11-04 15:55:02.226999-08",1.3
 1,4,"2020-11-04 15:57:02.226999-08",1.4
 1,5,"2020-11-04 15:58:02.226999-08",1.5
 1,6,"2020-11-04 15:59:02.226999-08",1.6
-2,7,"2020-11-04 15:54:02.226999-08",1.7
-2,8,"2020-11-04 15:55:02.226999-08",1.8
-2,9,"2020-11-04 15:56:02.226999-08",1.9
+2,7,"2020-11-04 15:51:02.226999-08",1.7
+2,8,"2020-11-04 15:53:02.226999-08",1.8
+2,9,"2020-11-04 15:55:02.226999-08",1.9
 2,10,"2020-11-04 15:57:02.226999-08",2.0
 2,11,"2020-11-04 15:58:02.226999-08",2.1
 2,12,"2020-11-04 15:59:02.226999-08",2.2
@@ -78,3 +79,11 @@ SELECT last(value, event_time), user_id FROM events GROUP BY user_id;
 SELECT first(event_id, event_time), user_id FROM events GROUP BY user_id;
 
 SELECT last(event_id, event_time), user_id FROM events GROUP BY user_id;
+
+SELECT last(user_id, value) top_performer,
+       locf(avg(value)) OVER (ORDER BY event_time),
+       event_time
+FROM date_bin_table(NULL::events, '1 minute',
+                    '[2020-11-04 15:50:00-08, 2020-11-04 16:00:00-08]')
+GROUP BY 3
+ORDER BY 3;