Fix failing regression test on x86-32 machines

95d6e9a added code to display the tuplestore storage type for
WindowAgg nodes and added a test to ensure the "Disk" storage method was
working correctly by setting work_mem to 64 and running a test which
caused the WindowAgg to go to disk.  Seemingly, the number of rows
chosen there wasn't quite enough for that to happen in x86 32-bit.

Fix this by increasing the number of rows slightly.

I suspect the buildfarm didn't catch this as MEMORY_CONTEXT_CHECKING
builds will use a bit more memory for MemoryChunks to store the
requested_size and also because of the additional space to store the
chunk's sentinel byte.

Reported-by: Christoph Berg <[email protected]>
Discussion: https://postgr.es/m/[email protected]

Author: david-rowley

src/test/regress/expected/explain.out

@@ -787,7 +787,7 @@ select explain_filter('explain (analyze,buffers off,costs off) select sum(n) ove
 
 -- Test tuplestore storage usage in Window aggregate (disk case)
 set work_mem to 64;
-select explain_filter('explain (analyze,buffers off,costs off) select sum(n) over() from generate_series(1,2000) a(n)');
+select explain_filter('explain (analyze,buffers off,costs off) select sum(n) over() from generate_series(1,2500) a(n)');
                                   explain_filter                                  
 ----------------------------------------------------------------------------------
  WindowAgg (actual time=N.N..N.N rows=N.N loops=N)
@@ -799,7 +799,7 @@ select explain_filter('explain (analyze,buffers off,costs off) select sum(n) ove
 (6 rows)
 
 -- Test tuplestore storage usage in Window aggregate (memory and disk case, final result is disk)
-select explain_filter('explain (analyze,buffers off,costs off) select sum(n) over(partition by m) from (SELECT n < 3 as m, n from generate_series(1,2000) a(n))');
+select explain_filter('explain (analyze,buffers off,costs off) select sum(n) over(partition by m) from (SELECT n < 3 as m, n from generate_series(1,2500) a(n))');
                                      explain_filter                                     
 ----------------------------------------------------------------------------------------
  WindowAgg (actual time=N.N..N.N rows=N.N loops=N)

src/test/regress/sql/explain.sql

@@ -183,7 +183,7 @@ select explain_filter('explain (analyze,buffers off,serialize) create temp table
 select explain_filter('explain (analyze,buffers off,costs off) select sum(n) over() from generate_series(1,10) a(n)');
 -- Test tuplestore storage usage in Window aggregate (disk case)
 set work_mem to 64;
-select explain_filter('explain (analyze,buffers off,costs off) select sum(n) over() from generate_series(1,2000) a(n)');
+select explain_filter('explain (analyze,buffers off,costs off) select sum(n) over() from generate_series(1,2500) a(n)');
 -- Test tuplestore storage usage in Window aggregate (memory and disk case, final result is disk)
-select explain_filter('explain (analyze,buffers off,costs off) select sum(n) over(partition by m) from (SELECT n < 3 as m, n from generate_series(1,2000) a(n))');
+select explain_filter('explain (analyze,buffers off,costs off) select sum(n) over(partition by m) from (SELECT n < 3 as m, n from generate_series(1,2500) a(n))');
 reset work_mem;