add test

Author: shruti2522

datafusion/sqllogictest/test_files/aggregate.slt

@@ -5008,10 +5008,10 @@ query I??
 SELECT column5, column1, avg(column1) OVER (PARTITION BY column5 ORDER BY column1 ROWS BETWEEN 1 PRECEDING AND CURRENT ROW) as window_avg 
 FROM d WHERE column1 IS NOT NULL;
 ----
-1 0 days 0 hours 0 mins 1 secs 0 days 0 hours 0 mins 1 secs
-1 0 days 0 hours 0 mins 11 secs 0 days 0 hours 0 mins 6 secs
 2 0 days 0 hours 0 mins 5 secs 0 days 0 hours 0 mins 5 secs
 2 0 days 0 hours 0 mins 25 secs 0 days 0 hours 0 mins 15 secs
+1 0 days 0 hours 0 mins 1 secs 0 days 0 hours 0 mins 1 secs
+1 0 days 0 hours 0 mins 11 secs 0 days 0 hours 0 mins 6 secs
 
 # Cumulative average window function
 query I??