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Standardize LSN formatting by zero padding

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This commit standardizes the output format for LSNs to ensure consistent
representation across various tools and messages.  Previously, LSNs were
inconsistently printed as `%X/%X` in some contexts, while others used
zero-padding.  This often led to confusion when comparing.

To address this, the LSN format is now uniformly set to `%X/%08X`,
ensuring the lower 32-bit part is always zero-padded to eight
hexadecimal digits.

Author: Japin Li <japinli@hotmail.com>
Reviewed-by: Masahiko Sawada <sawada.mshk@gmail.com>
Reviewed-by: Álvaro Herrera <alvherre@kurilemu.de>
Discussion: https://postgr.es/m/ME0P300MB0445CA53CA0E4B8C1879AF84B641A@ME0P300MB0445.AUSP300.PROD.OUTLOOK.COM
This commit is contained in:
Álvaro Herrera
2025-07-07 13:57:43 +02:00
parent 62a17a9283
commit 2633dae2e4
67 changed files with 681 additions and 681 deletions
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18
contrib/pageinspect/expected/gist.out
View File

@ -5,21 +5,21 @@ CREATE UNLOGGED TABLE test_gist AS SELECT point(i,i) p, i::text t FROM
CREATE INDEX test_gist_idx ON test_gist USING gist (p);
-- Page 0 is the root, the rest are leaf pages
SELECT * FROM gist_page_opaque_info(get_raw_page('test_gist_idx', 0));
lsn | nsn | rightlink | flags
-----+-----+------------+-------
0/1 | 0/0 | 4294967295 | {}
lsn | nsn | rightlink | flags
------------+------------+------------+-------
0/00000001 | 0/00000000 | 4294967295 | {}
(1 row)
SELECT * FROM gist_page_opaque_info(get_raw_page('test_gist_idx', 1));
lsn | nsn | rightlink | flags
-----+-----+------------+--------
0/1 | 0/0 | 4294967295 | {leaf}
lsn | nsn | rightlink | flags
------------+------------+------------+--------
0/00000001 | 0/00000000 | 4294967295 | {leaf}
(1 row)
SELECT * FROM gist_page_opaque_info(get_raw_page('test_gist_idx', 2));
lsn | nsn | rightlink | flags
-----+-----+-----------+--------
0/1 | 0/0 | 1 | {leaf}
lsn | nsn | rightlink | flags
------------+------------+-----------+--------
0/00000001 | 0/00000000 | 1 | {leaf}
(1 row)
SELECT * FROM gist_page_items(get_raw_page('test_gist_idx', 0), 'test_gist_idx');

6
contrib/pageinspect/expected/page.out
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@ -265,9 +265,9 @@ SELECT fsm_page_contents(decode(repeat('00', :block_size), 'hex'));
(1 row)
SELECT page_header(decode(repeat('00', :block_size), 'hex'));
page_header
-----------------------
(0/0,0,0,0,0,0,0,0,0)
page_header
------------------------------
(0/00000000,0,0,0,0,0,0,0,0)
(1 row)
SELECT page_checksum(decode(repeat('00', :block_size), 'hex'), 1);

2
contrib/pageinspect/rawpage.c
View File

@ -282,7 +282,7 @@ page_header(PG_FUNCTION_ARGS)
{
char lsnchar[64];
snprintf(lsnchar, sizeof(lsnchar), "%X/%X", LSN_FORMAT_ARGS(lsn));
snprintf(lsnchar, sizeof(lsnchar), "%X/%08X", LSN_FORMAT_ARGS(lsn));
values[0] = CStringGetTextDatum(lsnchar);
}
else