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Add pg_column_toast_chunk_id().

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This function returns the chunk_id of an on-disk TOASTed value.  If
the value is un-TOASTed or not on-disk, it returns NULL.  This is
useful for identifying which values are actually TOASTed and for
investigating "unexpected chunk number" errors.

Bumps catversion.

Author: Yugo Nagata
Reviewed-by: Jian He
Discussion: https://postgr.es/m/20230329105507.d764497456eeac1ca491b5bd%40sraoss.co.jp
This commit is contained in:
Nathan Bossart
2024-03-14 10:58:00 -05:00
parent 84c18acaf6
commit d1162cfda8
6 changed files with 90 additions and 1 deletions
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17
doc/src/sgml/func.sgml
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@ -28552,6 +28552,23 @@ postgres=# SELECT '0/0'::pg_lsn + pd.segment_number * ps.setting::int + :offset
</para></entry>
</row>
<row>
<entry role="func_table_entry"><para role="func_signature">
<indexterm>
<primary>pg_column_toast_chunk_id</primary>
</indexterm>
<function>pg_column_toast_chunk_id</function> ( <type>"any"</type> )
<returnvalue>oid</returnvalue>
</para>
<para>
Shows the <structfield>chunk_id</structfield> of an on-disk
<acronym>TOAST</acronym>ed value. Returns <literal>NULL</literal>
if the value is un-<acronym>TOAST</acronym>ed or not on-disk. See
<xref linkend="storage-toast"/> for more information about
<acronym>TOAST</acronym>.
</para></entry>
</row>
<row>
<entry role="func_table_entry"><para role="func_signature">
<indexterm>