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Show empty BRIN ranges in brin_page_items

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Commit 3581cbdcd6 added a flag to identify empty BRIN ranges. This adds
the new flag to brin_page_items() output.

This is kept as a separate commit as it should not be backpatched.

Reviewed-by: Justin Pryzby, Matthias van de Meent, Alvaro Herrera
Discussion: https://postgr.es/m/402430e4-7d9d-6cf1-09ef-464d80afff3b@enterprisedb.com
This commit is contained in:
Tomas Vondra
2023-05-19 01:53:30 +02:00
parent 3581cbdcd6
commit 428c0cae92
5 changed files with 48 additions and 29 deletions
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16
doc/src/sgml/pageinspect.sgml
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@@ -613,14 +613,14 @@ test=# SELECT * FROM brin_revmap_data(get_raw_page('brinidx', 2)) LIMIT 5;
test=# SELECT * FROM brin_page_items(get_raw_page('brinidx', 5),
'brinidx')
ORDER BY blknum, attnum LIMIT 6;
itemoffset | blknum | attnum | allnulls | hasnulls | placeholder | value
------------+--------+--------+----------+----------+-------------+--------------
137 | 0 | 1 | t | f | f |
137 | 0 | 2 | f | f | f | {1 .. 88}
138 | 4 | 1 | t | f | f |
138 | 4 | 2 | f | f | f | {89 .. 176}
139 | 8 | 1 | t | f | f |
139 | 8 | 2 | f | f | f | {177 .. 264}
itemoffset | blknum | attnum | allnulls | hasnulls | placeholder | empty | value
------------+--------+--------+----------+----------+-------------+-------+--------------
137 | 0 | 1 | t | f | f | f |
137 | 0 | 2 | f | f | f | f | {1 .. 88}
138 | 4 | 1 | t | f | f | f |
138 | 4 | 2 | f | f | f | f | {89 .. 176}
139 | 8 | 1 | t | f | f | f |
139 | 8 | 2 | f | f | f | f | {177 .. 264}
</screen>
The returned columns correspond to the fields in the
<structname>BrinMemTuple</structname> and <structname>BrinValues</structname> structs.