Fix portability issues in the new gist pageinspect test.

1. The raw bytea representation of the point-type keys used in the test
   depends on endianess. Remove the raw key_data column from the test.

2. The items stored on non-leftmost gist page depends on how many items
   git on the other pages. This showed up as a failure on 32-bit i386
   systems. To fix, only test the gist_page_items() function on the
   leftmost leaf page.

Per Andrey Borodin and the buildfarm.

Discussion: https://www.postgresql.org/message-id/9FCEC1DC-86FB-4A57-88EF-DD13663B36AF%40yandex-team.ru

Author: hlinnaka

contrib/pageinspect/expected/gist.out

@@ -42,46 +42,18 @@ SELECT * FROM gist_page_items(get_raw_page('test_gist_idx', 1), 'test_gist_idx')
           5 | (0,5) |      40 | (p)=((5,5))
 (5 rows)
 
-SELECT * FROM gist_page_items(get_raw_page('test_gist_idx', 2), 'test_gist_idx') LIMIT 5;
- itemoffset |  ctid  | itemlen |      keys       
-------------+--------+---------+-----------------
-          1 | (1,10) |      40 | (p)=((167,167))
-          2 | (1,11) |      40 | (p)=((168,168))
-          3 | (1,12) |      40 | (p)=((169,169))
-          4 | (1,13) |      40 | (p)=((170,170))
-          5 | (1,14) |      40 | (p)=((171,171))
-(5 rows)
-
-SELECT * FROM gist_page_items_bytea(get_raw_page('test_gist_idx', 0));
- itemoffset |   ctid    | itemlen |                                      key_data                                      
-------------+-----------+---------+------------------------------------------------------------------------------------
-          1 | (1,65535) |      40 | \x00000100ffff28000000000000c064400000000000c06440000000000000f03f000000000000f03f
-          2 | (2,65535) |      40 | \x00000200ffff28000000000000c074400000000000c074400000000000e064400000000000e06440
-          3 | (3,65535) |      40 | \x00000300ffff28000000000000207f400000000000207f400000000000d074400000000000d07440
-          4 | (4,65535) |      40 | \x00000400ffff28000000000000c084400000000000c084400000000000307f400000000000307f40
-          5 | (5,65535) |      40 | \x00000500ffff28000000000000f089400000000000f089400000000000c884400000000000c88440
-          6 | (6,65535) |      40 | \x00000600ffff28000000000000208f400000000000208f400000000000f889400000000000f88940
-          7 | (7,65535) |      40 | \x00000700ffff28000000000000408f400000000000408f400000000000288f400000000000288f40
+-- gist_page_items_bytea prints the raw key data as a bytea. The output of that is
+-- platform-dependent (endianess), so omit the actual key data from the output.
+SELECT itemoffset, ctid, itemlen FROM gist_page_items_bytea(get_raw_page('test_gist_idx', 0));
+ itemoffset |   ctid    | itemlen 
+------------+-----------+---------
+          1 | (1,65535) |      40
+          2 | (2,65535) |      40
+          3 | (3,65535) |      40
+          4 | (4,65535) |      40
+          5 | (5,65535) |      40
+          6 | (6,65535) |      40
+          7 | (7,65535) |      40
 (7 rows)
 
-SELECT * FROM gist_page_items_bytea(get_raw_page('test_gist_idx', 1)) LIMIT 5;
- itemoffset | ctid  | itemlen |                                      key_data                                      
-------------+-------+---------+------------------------------------------------------------------------------------
-          1 | (0,1) |      40 | \x0000000001002800000000000000f03f000000000000f03f000000000000f03f000000000000f03f
-          2 | (0,2) |      40 | \x00000000020028000000000000000040000000000000004000000000000000400000000000000040
-          3 | (0,3) |      40 | \x00000000030028000000000000000840000000000000084000000000000008400000000000000840
-          4 | (0,4) |      40 | \x00000000040028000000000000001040000000000000104000000000000010400000000000001040
-          5 | (0,5) |      40 | \x00000000050028000000000000001440000000000000144000000000000014400000000000001440
-(5 rows)
-
-SELECT * FROM gist_page_items_bytea(get_raw_page('test_gist_idx', 2)) LIMIT 5;
- itemoffset |  ctid  | itemlen |                                      key_data                                      
-------------+--------+---------+------------------------------------------------------------------------------------
-          1 | (1,10) |      40 | \x000001000a0028000000000000e064400000000000e064400000000000e064400000000000e06440
-          2 | (1,11) |      40 | \x000001000b0028000000000000006540000000000000654000000000000065400000000000006540
-          3 | (1,12) |      40 | \x000001000c0028000000000000206540000000000020654000000000002065400000000000206540
-          4 | (1,13) |      40 | \x000001000d0028000000000000406540000000000040654000000000004065400000000000406540
-          5 | (1,14) |      40 | \x000001000e0028000000000000606540000000000060654000000000006065400000000000606540
-(5 rows)
-
 DROP TABLE test_gist;

contrib/pageinspect/sql/gist.sql

@@ -9,10 +9,9 @@ SELECT * FROM gist_page_opaque_info(get_raw_page('test_gist_idx', 2));
 
 SELECT * FROM gist_page_items(get_raw_page('test_gist_idx', 0), 'test_gist_idx');
 SELECT * FROM gist_page_items(get_raw_page('test_gist_idx', 1), 'test_gist_idx') LIMIT 5;
-SELECT * FROM gist_page_items(get_raw_page('test_gist_idx', 2), 'test_gist_idx') LIMIT 5;
 
-SELECT * FROM gist_page_items_bytea(get_raw_page('test_gist_idx', 0));
-SELECT * FROM gist_page_items_bytea(get_raw_page('test_gist_idx', 1)) LIMIT 5;
-SELECT * FROM gist_page_items_bytea(get_raw_page('test_gist_idx', 2)) LIMIT 5;
+-- gist_page_items_bytea prints the raw key data as a bytea. The output of that is
+-- platform-dependent (endianess), so omit the actual key data from the output.
+SELECT itemoffset, ctid, itemlen FROM gist_page_items_bytea(get_raw_page('test_gist_idx', 0));
 
 DROP TABLE test_gist;