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pageinspect: Add bt_page_items function with bytea argument

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Author: Tomas Vondra <tomas.vondra@2ndquadrant.com>
Reviewed-by: Ashutosh Sharma <ashu.coek88@gmail.com>
This commit is contained in:
Peter Eisentraut
2017-04-04 23:48:49 -04:00
parent 5ebeb579b9
commit 193f5f9e91
6 changed files with 211 additions and 51 deletions
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32
doc/src/sgml/pageinspect.sgml
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@@ -333,6 +333,38 @@ test=# SELECT * FROM bt_page_items('pg_cast_oid_index', 1);
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<function>bt_page_items(page bytea) returns setof record</function>
<indexterm>
<primary>bt_page_items</primary>
</indexterm>
</term>
<listitem>
<para>
It is also possible to pass a page to <function>bt_page_items</function>
as a <type>bytea</> value. A page image obtained
with <function>get_raw_page</function> should be passed as argument. So
the last example could also be rewritten like this:
<screen>
test=# SELECT * FROM bt_page_items(get_raw_page('pg_cast_oid_index', 1));
itemoffset | ctid | itemlen | nulls | vars | data
------------+---------+---------+-------+------+-------------
1 | (0,1) | 12 | f | f | 23 27 00 00
2 | (0,2) | 12 | f | f | 24 27 00 00
3 | (0,3) | 12 | f | f | 25 27 00 00
4 | (0,4) | 12 | f | f | 26 27 00 00
5 | (0,5) | 12 | f | f | 27 27 00 00
6 | (0,6) | 12 | f | f | 28 27 00 00
7 | (0,7) | 12 | f | f | 29 27 00 00
8 | (0,8) | 12 | f | f | 2a 27 00 00
</screen>
All the other details are the same as explained in the previous item.
</para>
</listitem>
</varlistentry>
</variablelist>
</sect2>