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Docs: fix pg_wal_lsn_diff manual. 

The manual did not mention whether its return value is (first arg -
second arg) or (second arg - first arg). The order matters because the
return value could have a sign. Fix the manual so that it mentions the
function returns (first arg - second arg).

Patch reviewed by Tom Lane.

Back-patch through v13. Older version's doc format is difficult to add
more description.
Discussion: https://postgr.es/m/flat/20210206.151125.960423226279810864.t-ishii%40sraoss.co.jp
This commit is contained in:
Tatsuo Ishii 2021-02-07 13:48:19 +09:00
parent 739375174a
commit 9c89c4bd8d
1 changed files with 2 additions and 2 deletions
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doc/src/sgml/func.sgml
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@ -24403,11 +24403,11 @@ SELECT collation for ('foo' COLLATE "de_DE");
<indexterm>
<primary>pg_wal_lsn_diff</primary>
</indexterm>
<function>pg_wal_lsn_diff</function> ( <parameter>lsn</parameter> <type>pg_lsn</type>, <parameter>lsn</parameter> <type>pg_lsn</type> )
<function>pg_wal_lsn_diff</function> ( <parameter>lsn1</parameter> <type>pg_lsn</type>, <parameter>lsn2</parameter> <type>pg_lsn</type> )
<returnvalue>numeric</returnvalue>
</para>
<para>
Calculates the difference in bytes between two write-ahead log
Calculates the difference in bytes (<parameter>lsn1</parameter> - <parameter>lsn2</parameter>) between two write-ahead log
locations. This can be used
with <structname>pg_stat_replication</structname> or some of the
functions shown in <xref linkend="functions-admin-backup-table"/> to