Fix contrib/pageinspect's test for sequences.

I managed to break this test in two different ways in commit
05036a3155.

First, the output of the new call to tuple_data_split() on the test
sequence is dependent on endianness.  This is fixed by setting a
special start value for the test sequence that produces the same
output regardless of the endianness of the machine.

Second, on versions older than v15, the new test case fails under
"force_parallel_mode = regress" with the following error:

	ERROR:  cannot access temporary tables during a parallel operation

This is because pageinspect's disk-accessing functions are
incorrectly marked PARALLEL SAFE on versions older than v15 (see
commit aeaaf520f4 for details).  This one is fixed by changing the
test sequence to be permanent.  The only reason it was previously
marked temporary was to avoid needing a DROP SEQUENCE command at
the end of the test.  Unlike some other tests in this file, the use
of a permanent sequence here shouldn't result in any test
instability like what was fixed by commit e2933a6e11.

Reviewed-by: Tom Lane
Discussion: https://postgr.es/m/ZuOKOut5hhDlf_bP%40nathan
Backpatch-through: 12

diff --git a/contrib/pageinspect/expected/page.out b/contrib/pageinspect/expected/page.out
index 0e4a5e55ffb0058c4e720faf09c60e3bd75c5d0a..f73c192c93af8980f5fe6aedd471dbdf24b8507b 100644 (file)
--- a/contrib/pageinspect/expected/page.out
+++ b/contrib/pageinspect/expected/page.out
@@ -237,11 +237,12 @@ SELECT page_checksum(decode(repeat('00', :block_size), 'hex'), 1);
 (1 row)
 
 -- tests for sequences
-create temporary sequence test_sequence;
+create sequence test_sequence start 72057594037927937;
 select tuple_data_split('test_sequence'::regclass, t_data, t_infomask, t_infomask2, t_bits)
   from heap_page_items(get_raw_page('test_sequence', 0));
                    tuple_data_split                    
 -------------------------------------------------------
- {"\\x0100000000000000","\\x0000000000000000","\\x00"}
+ {"\\x0100000000000001","\\x0000000000000000","\\x00"}
 (1 row)
 
+drop sequence test_sequence;

diff --git a/contrib/pageinspect/sql/page.sql b/contrib/pageinspect/sql/page.sql
index ebc6e71ce39ef9bbbe30af1264cb0e7574891e58..358a3be31c99ea415786aee76400b7e42edefa8b 100644 (file)
--- a/contrib/pageinspect/sql/page.sql
+++ b/contrib/pageinspect/sql/page.sql
@@ -99,6 +99,7 @@ SELECT page_header(decode(repeat('00', :block_size), 'hex'));
 SELECT page_checksum(decode(repeat('00', :block_size), 'hex'), 1);
 
 -- tests for sequences
-create temporary sequence test_sequence;
+create sequence test_sequence start 72057594037927937;
 select tuple_data_split('test_sequence'::regclass, t_data, t_infomask, t_infomask2, t_bits)
   from heap_page_items(get_raw_page('test_sequence', 0));
+drop sequence test_sequence;