Fix further fallout from EXPLAIN ANALYZE BUFFERS change

c2a4078eb adjusted EXPLAIN ANALYZE to default the BUFFERS to ON.  This
(hopefully) fixes the last remaining issue with regression test failures
with -D RELCACHE_FORCE_RELEASE -D CATCACHE_FORCE_RELEASE builds, where
the planner accesses more buffers due to the cold caches.

Discussion: https://postgr.es/m/CAApHDvqLdzgz77JsE-yTki3w9UiKQ-uTMLRctazcu+99-ips3g@mail.gmail.com

contrib/pg_stat_statements/expected/level_tracking.out

@@ -903,13 +903,13 @@ SELECT pg_stat_statements_reset() IS NOT NULL AS t;
  t
 (1 row)
 
-EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF) SELECT 100;
+EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF, BUFFERS OFF) SELECT 100;
            QUERY PLAN           
 --------------------------------
  Result (actual rows=1 loops=1)
 (1 row)
 
-EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF)
+EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF, BUFFERS OFF)
   DECLARE foocur CURSOR FOR SELECT * FROM stats_track_tab;
                      QUERY PLAN                      
 -----------------------------------------------------
@@ -918,11 +918,11 @@ EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF)
 
 SELECT toplevel, calls, query FROM pg_stat_statements
   ORDER BY query COLLATE "C";
- toplevel | calls |                              query                              
-----------+-------+-----------------------------------------------------------------
- t        |     1 | EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF)          +
+ toplevel | calls |                                    query                                     
+----------+-------+------------------------------------------------------------------------------
+ t        |     1 | EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF, BUFFERS OFF)          +
           |       |   DECLARE foocur CURSOR FOR SELECT * FROM stats_track_tab
- t        |     1 | EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF) SELECT $1
+ t        |     1 | EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF, BUFFERS OFF) SELECT $1
  f        |     1 | SELECT $1
  f        |     1 | SELECT * FROM stats_track_tab
  t        |     1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
@@ -936,13 +936,13 @@ SELECT pg_stat_statements_reset() IS NOT NULL AS t;
  t
 (1 row)
 
-EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF) SELECT 100;
+EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF, BUFFERS OFF) SELECT 100;
            QUERY PLAN           
 --------------------------------
  Result (actual rows=1 loops=1)
 (1 row)
 
-EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF)
+EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF, BUFFERS OFF)
   DECLARE foocur CURSOR FOR SELECT * FROM stats_track_tab;
                      QUERY PLAN                      
 -----------------------------------------------------
@@ -951,11 +951,11 @@ EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF)
 
 SELECT toplevel, calls, query FROM pg_stat_statements
   ORDER BY query COLLATE "C";
- toplevel | calls |                              query                              
-----------+-------+-----------------------------------------------------------------
- t        |     1 | EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF)          +
+ toplevel | calls |                                    query                                     
+----------+-------+------------------------------------------------------------------------------
+ t        |     1 | EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF, BUFFERS OFF)          +
           |       |   DECLARE foocur CURSOR FOR SELECT * FROM stats_track_tab
- t        |     1 | EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF) SELECT $1
+ t        |     1 | EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF, BUFFERS OFF) SELECT $1
  t        |     1 | SELECT pg_stat_statements_reset() IS NOT NULL AS t
 (3 rows)
 

contrib/pg_stat_statements/sql/level_tracking.sql

@@ -175,8 +175,8 @@ SELECT toplevel, calls, query FROM pg_stat_statements
 -- Explain analyze, all-level tracking.
 SET pg_stat_statements.track = 'all';
 SELECT pg_stat_statements_reset() IS NOT NULL AS t;
-EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF) SELECT 100;
-EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF)
+EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF, BUFFERS OFF) SELECT 100;
+EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF, BUFFERS OFF)
   DECLARE foocur CURSOR FOR SELECT * FROM stats_track_tab;
 SELECT toplevel, calls, query FROM pg_stat_statements
   ORDER BY query COLLATE "C";
@@ -184,8 +184,8 @@ SELECT toplevel, calls, query FROM pg_stat_statements
 -- Explain analyze, top tracking.
 SET pg_stat_statements.track = 'top';
 SELECT pg_stat_statements_reset() IS NOT NULL AS t;
-EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF) SELECT 100;
-EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF)
+EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF, BUFFERS OFF) SELECT 100;
+EXPLAIN (ANALYZE, COSTS OFF, SUMMARY OFF, TIMING OFF, BUFFERS OFF)
   DECLARE foocur CURSOR FOR SELECT * FROM stats_track_tab;
 SELECT toplevel, calls, query FROM pg_stat_statements
   ORDER BY query COLLATE "C";