Stabilize test introduced in 05c02589, per buildfarm.

In passing, make the capitalization match the rest of the file.

Reported-by: Tom Lane

src/test/regress/expected/groupingsets.out

@@ -1666,12 +1666,13 @@ select v||'a', case when grouping(v||'a') = 1 then 1 else 0 end, count(*)
 (4 rows)
 
 -- Bug #16784
-CREATE TABLE bug_16784(i INT, j INT);
-ANALYZE bug_16784;
-ALTER TABLE bug_16784 SET (autovacuum_enabled = 'false');
-UPDATE pg_class SET reltuples = 10 WHERE relname='bug_16784';
-INSERT INTO bug_16784 SELECT g/10, g FROM generate_series(1,40) g;
-SET work_mem='64kB';
+create table bug_16784(i int, j int);
+analyze bug_16784;
+alter table bug_16784 set (autovacuum_enabled = 'false');
+update pg_class set reltuples = 10 where relname='bug_16784';
+insert into bug_16784 select g/10, g from generate_series(1,40) g;
+set work_mem='64kB';
+set enable_sort = false;
 explain (costs off) select * from
   (values (1),(2)) v(a),
   lateral (select v.a, i, j, count(*) from
@@ -1883,8 +1884,9 @@ select g%1000 as g1000, g%100 as g100, g%10 as g10, g
 analyze gs_data_1;
 alter table gs_data_1 set (autovacuum_enabled = 'false');
 update pg_class set reltuples = 10 where relname='gs_data_1';
-SET work_mem='64kB';
+set work_mem='64kB';
 -- Produce results with sorting.
+set enable_sort = true;
 set enable_hashagg = false;
 set jit_above_cost = 0;
 explain (costs off)

src/test/regress/sql/groupingsets.sql

@@ -458,14 +458,15 @@ select v||'a', case when grouping(v||'a') = 1 then 1 else 0 end, count(*)
  group by rollup(i, v||'a') order by 1,3;
 
 -- Bug #16784
-CREATE TABLE bug_16784(i INT, j INT);
-ANALYZE bug_16784;
-ALTER TABLE bug_16784 SET (autovacuum_enabled = 'false');
-UPDATE pg_class SET reltuples = 10 WHERE relname='bug_16784';
+create table bug_16784(i int, j int);
+analyze bug_16784;
+alter table bug_16784 set (autovacuum_enabled = 'false');
+update pg_class set reltuples = 10 where relname='bug_16784';
 
-INSERT INTO bug_16784 SELECT g/10, g FROM generate_series(1,40) g;
+insert into bug_16784 select g/10, g from generate_series(1,40) g;
 
-SET work_mem='64kB';
+set work_mem='64kB';
+set enable_sort = false;
 
 explain (costs off) select * from
   (values (1),(2)) v(a),
@@ -492,10 +493,11 @@ analyze gs_data_1;
 alter table gs_data_1 set (autovacuum_enabled = 'false');
 update pg_class set reltuples = 10 where relname='gs_data_1';
 
-SET work_mem='64kB';
+set work_mem='64kB';
 
 -- Produce results with sorting.
 
+set enable_sort = true;
 set enable_hashagg = false;
 set jit_above_cost = 0;