Revert "Temporarily instrument postgres_fdw test to look for statistics changes."

This reverts commit c2c537c56d.
It's now clear that whatever is going on there, it can't be blamed
on unexpected ANALYZE runs, because the statistics are the same
just before the failing query as they were at the start of the test.

contrib/postgres_fdw/expected/postgres_fdw.out

@@ -87,23 +87,6 @@ ANALYZE "S 1"."T 1";
 ANALYZE "S 1"."T 2";
 ANALYZE "S 1"."T 3";
 ANALYZE "S 1"."T 4";
--- record relpages for T 1
-create temp table save_t_1_relpages as
-  select relpages as old_relpages from pg_class where relname = 'T 1';
-select relpages - (select old_relpages from save_t_1_relpages) as pg_delta,
-  reltuples from pg_class where relname = 'T 1';
- pg_delta | reltuples 
-----------+-----------
-        0 |      1000
-(1 row)
-
-select (histogram_bounds::text::int[])[array_length(histogram_bounds,1)]
-  from pg_stats where tablename = 'T 1' and attname = 'C 1';
- histogram_bounds 
-------------------
-             1000
-(1 row)
-
 -- ===================================================================
 -- create foreign tables
 -- ===================================================================
@@ -5537,20 +5520,6 @@ UPDATE ft2 SET c3 = 'bar' WHERE postgres_fdw_abs(c1) > 2000 RETURNING *;
  2010 |  0 | bar |    |    |    | ft2        | 
 (10 rows)
 
-select relpages - (select old_relpages from save_t_1_relpages) as pg_delta,
-  reltuples from pg_class where relname = 'T 1';
- pg_delta | reltuples 
-----------+-----------
-        0 |      1000
-(1 row)
-
-select (histogram_bounds::text::int[])[array_length(histogram_bounds,1)]
-  from pg_stats where tablename = 'T 1' and attname = 'C 1';
- histogram_bounds 
-------------------
-             1000
-(1 row)
-
 EXPLAIN (verbose, costs off)
 UPDATE ft2 SET c3 = 'baz'
   FROM ft4 INNER JOIN ft5 ON (ft4.c1 = ft5.c1)

contrib/postgres_fdw/sql/postgres_fdw.sql

@@ -95,15 +95,6 @@ ANALYZE "S 1"."T 2";
 ANALYZE "S 1"."T 3";
 ANALYZE "S 1"."T 4";
 
--- record relpages for T 1
-create temp table save_t_1_relpages as
-  select relpages as old_relpages from pg_class where relname = 'T 1';
-
-select relpages - (select old_relpages from save_t_1_relpages) as pg_delta,
-  reltuples from pg_class where relname = 'T 1';
-select (histogram_bounds::text::int[])[array_length(histogram_bounds,1)]
-  from pg_stats where tablename = 'T 1' and attname = 'C 1';
-
 -- ===================================================================
 -- create foreign tables
 -- ===================================================================
@@ -1148,10 +1139,6 @@ INSERT INTO ft2 (c1,c2,c3)
 EXPLAIN (verbose, costs off)
 UPDATE ft2 SET c3 = 'bar' WHERE postgres_fdw_abs(c1) > 2000 RETURNING *;            -- can't be pushed down
 UPDATE ft2 SET c3 = 'bar' WHERE postgres_fdw_abs(c1) > 2000 RETURNING *;
-select relpages - (select old_relpages from save_t_1_relpages) as pg_delta,
-  reltuples from pg_class where relname = 'T 1';
-select (histogram_bounds::text::int[])[array_length(histogram_bounds,1)]
-  from pg_stats where tablename = 'T 1' and attname = 'C 1';
 EXPLAIN (verbose, costs off)
 UPDATE ft2 SET c3 = 'baz'
   FROM ft4 INNER JOIN ft5 ON (ft4.c1 = ft5.c1)