test(streaming): fix order assumption in extreme_null (#1770)

Signed-off-by: Bugen Zhao <[email protected]>

e2e_test/streaming/extreme_null.slt

@@ -10,21 +10,12 @@ insert into t1 values (1,4,2), (2,3,3);
 statement ok
 insert into t4 values (1,1,4), (NULL,1,4), (2,9,1), (NULL,8,1), (0,2,3);
 
-statement ok
-create materialized view mv1 as select * from t1;
-
 statement ok
 create materialized view mv2 as select round(avg(v1), 1) as avg_v1, sum(v2) as sum_v2, count(v3) as count_v3 from t1;
 
 statement ok
 create materialized view mv3 as select sum(v1) as sum_v1, min(v1) as min_v1, max(v1) as max_v1 from t4 group by v3;
 
-query III
-select v1, v2, v3 from mv1;
-----
-1 4 2
-2 3 3
-
 query RII
 select avg_v1, sum_v2, count_v3 from mv2;
 ----
@@ -36,14 +27,6 @@ insert into t1 values (3,4,4), (4,3,5);
 statement ok
 flush;
 
-query III
-select v1, v2, v3 from mv1;
-----
-1 4 2
-2 3 3
-3 4 4
-4 3 5
-
 query RII
 select avg_v1, sum_v2, count_v3 from mv2;
 ----
@@ -56,9 +39,6 @@ select sum_v1, min_v1, max_v1, v3 from mv3 order by sum_v1;
 1 NULL 1 4
 2 NULL 2 1
 
-statement ok
-drop materialized view mv1
-
 statement ok
 drop materialized view mv2