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michaelpqmichaelpq
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Rename pg_dissect_walfile_name() to pg_split_walfile_name()
The former name was discussed as being confusing, so use "split", as per a suggestion from Magnus Hagander. While on it, one of the output arguments is renamed from "segno" to "segment_number", as per a suggestion from Kyotaro Horiguchi. The documentation is updated to reflect all these changes. Bump catalog version. Author: Bharath Rupireddy, Michael Paquier Discussion: https://postgr.es/m/CABUevEytQVaOOhGdoh0D7hGwe3fuKcRF6NthsSW7ww04EmtFgQ@mail.gmail.com
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+41
-41
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‎doc/src/sgml/func.sgml

+7-7
Original file line numberDiff line numberDiff line change
@@ -26101,15 +26101,15 @@ LOG: Grand total: 1651920 bytes in 201 blocks; 622360 free (88 chunks); 1029560
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<row>
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<entry role="func_table_entry"><para role="func_signature">
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<indexterm>
26104-
<primary>pg_dissect_walfile_name</primary>
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<primary>pg_split_walfile_name</primary>
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</indexterm>
26106-
<function>pg_dissect_walfile_name</function> ( <parameter>file_name</parameter> <type>text</type> )
26106+
<function>pg_split_walfile_name</function> ( <parameter>file_name</parameter> <type>text</type> )
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<returnvalue>record</returnvalue>
26108-
( <parameter>segno</parameter> <type>numeric</type>,
26108+
( <parameter>segment_number</parameter> <type>numeric</type>,
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<parameter>timeline_id</parameter> <type>bigint</type> )
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</para>
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<para>
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Extracts the file sequence number and timeline ID from a WAL file
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Extracts the sequence number and timeline ID from a WAL file
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name.
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</para></entry>
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</row>
@@ -26172,13 +26172,13 @@ postgres=# SELECT * FROM pg_walfile_name_offset((pg_backup_stop()).lsn);
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</para>
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<para>
26175-
<function>pg_dissect_walfile_name</function> is useful to compute a
26175+
<function>pg_split_walfile_name</function> is useful to compute a
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<acronym>LSN</acronym> from a file offset and WAL file name, for example:
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<programlisting>
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postgres=# \set file_name '000000010000000100C000AB'
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postgres=# \set offset 256
26180-
postgres=# SELECT '0/0'::pg_lsn + pd.segno * ps.setting::int + :offset AS lsn
26181-
FROM pg_dissect_walfile_name(:'file_name') pd,
26180+
postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset AS lsn
26181+
FROM pg_split_walfile_name(:'file_name') pd,
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pg_show_all_settings() ps
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WHERE ps.name = 'wal_segment_size';
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lsn

‎src/backend/access/transam/xlogfuncs.c

+5-5
Original file line numberDiff line numberDiff line change
@@ -437,16 +437,16 @@ pg_walfile_name(PG_FUNCTION_ARGS)
437437
* name.
438438
*/
439439
Datum
440-
pg_dissect_walfile_name(PG_FUNCTION_ARGS)
440+
pg_split_walfile_name(PG_FUNCTION_ARGS)
441441
{
442-
#define PG_DISSECT_WALFILE_NAME_COLS 2
442+
#define PG_SPLIT_WALFILE_NAME_COLS 2
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char *fname = text_to_cstring(PG_GETARG_TEXT_PP(0));
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char *fname_upper;
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char *p;
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TimeLineID tli;
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XLogSegNo segno;
448-
Datum values[PG_DISSECT_WALFILE_NAME_COLS] = {0};
449-
bool isnull[PG_DISSECT_WALFILE_NAME_COLS] = {0};
448+
Datum values[PG_SPLIT_WALFILE_NAME_COLS] = {0};
449+
bool isnull[PG_SPLIT_WALFILE_NAME_COLS] = {0};
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TupleDesc tupdesc;
451451
HeapTuple tuple;
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char buf[256];
@@ -482,7 +482,7 @@ pg_dissect_walfile_name(PG_FUNCTION_ARGS)
482482

483483
PG_RETURN_DATUM(result);
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485-
#undef PG_DISSECT_WALFILE_NAME_COLS
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#undef PG_SPLIT_WALFILE_NAME_COLS
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}
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/*

‎src/include/catalog/catversion.h

+1-1
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@@ -57,6 +57,6 @@
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*/
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/* yyyymmddN */
60-
#define CATALOG_VERSION_NO 202212231
60+
#define CATALOG_VERSION_NO 202212232
6161

6262
#endif

‎src/include/catalog/pg_proc.dat

+3-3
Original file line numberDiff line numberDiff line change
@@ -6374,11 +6374,11 @@
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prosrc => 'pg_walfile_name' },
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{ oid => '8205',
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descr => 'sequence number and timeline ID given a wal filename',
6377-
proname => 'pg_dissect_walfile_name', provolatile => 's',
6377+
proname => 'pg_split_walfile_name', provolatile => 's',
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prorettype => 'record', proargtypes => 'text',
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proallargtypes => '{text,numeric,int8}', proargmodes => '{i,o,o}',
6380-
proargnames => '{file_name,segno,timeline_id}',
6381-
prosrc => 'pg_dissect_walfile_name' },
6380+
proargnames => '{file_name,segment_number,timeline_id}',
6381+
prosrc => 'pg_split_walfile_name' },
63826382

63836383
{ oid => '3165', descr => 'difference in bytes, given two wal locations',
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proname => 'pg_wal_lsn_diff', prorettype => 'numeric',

‎src/test/regress/expected/misc_functions.out

+18-18
Original file line numberDiff line numberDiff line change
@@ -619,26 +619,26 @@ SELECT count(*) > 0 AS ok FROM pg_control_system();
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t
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(1 row)
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622-
-- pg_dissect_walfile_name
623-
SELECT * FROM pg_dissect_walfile_name(NULL);
624-
segno | timeline_id
625-
-------+-------------
626-
|
622+
-- pg_split_walfile_name
623+
SELECT * FROM pg_split_walfile_name(NULL);
624+
segment_number | timeline_id
625+
----------------+-------------
626+
|
627627
(1 row)
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629-
SELECT * FROM pg_dissect_walfile_name('invalid');
629+
SELECT * FROM pg_split_walfile_name('invalid');
630630
ERROR: invalid WAL file name "invalid"
631-
SELECT segno > 0 AS ok_segno, timeline_id
632-
FROM pg_dissect_walfile_name('000000010000000100000000');
633-
ok_segno | timeline_id
634-
----------+-------------
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t | 1
636-
(1 row)
637-
638-
SELECT segno > 0 AS ok_segno, timeline_id
639-
FROM pg_dissect_walfile_name('ffffffFF00000001000000af');
640-
ok_segno | timeline_id
641-
----------+-------------
642-
t | 4294967295
631+
SELECT segment_number > 0 AS ok_segment_number, timeline_id
632+
FROM pg_split_walfile_name('000000010000000100000000');
633+
ok_segment_number | timeline_id
634+
-------------------+-------------
635+
t | 1
636+
(1 row)
637+
638+
SELECT segment_number > 0 AS ok_segment_number, timeline_id
639+
FROM pg_split_walfile_name('ffffffFF00000001000000af');
640+
ok_segment_number | timeline_id
641+
-------------------+-------------
642+
t | 4294967295
643643
(1 row)
644644

‎src/test/regress/sql/misc_functions.sql

+7-7
Original file line numberDiff line numberDiff line change
@@ -230,10 +230,10 @@ SELECT count(*) > 0 AS ok FROM pg_control_init();
230230
SELECT count(*) > 0 AS ok FROM pg_control_recovery();
231231
SELECT count(*) > 0 AS ok FROM pg_control_system();
232232

233-
-- pg_dissect_walfile_name
234-
SELECT * FROM pg_dissect_walfile_name(NULL);
235-
SELECT * FROM pg_dissect_walfile_name('invalid');
236-
SELECT segno > 0 AS ok_segno, timeline_id
237-
FROM pg_dissect_walfile_name('000000010000000100000000');
238-
SELECT segno > 0 AS ok_segno, timeline_id
239-
FROM pg_dissect_walfile_name('ffffffFF00000001000000af');
233+
-- pg_split_walfile_name
234+
SELECT * FROM pg_split_walfile_name(NULL);
235+
SELECT * FROM pg_split_walfile_name('invalid');
236+
SELECT segment_number > 0 AS ok_segment_number, timeline_id
237+
FROM pg_split_walfile_name('000000010000000100000000');
238+
SELECT segment_number > 0 AS ok_segment_number, timeline_id
239+
FROM pg_split_walfile_name('ffffffFF00000001000000af');

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