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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
Download Patch File Download Diff File Expand all files Collapse all files

10
contrib/pageinspect/brinfuncs.c
View File

@ -201,8 +201,8 @@ brin_page_items(PG_FUNCTION_ARGS)
dtup = NULL;
for (;;)
{
Datum values[7];
bool nulls[7] = {0};
Datum values[8];
bool nulls[8] = {0};
/*
* This loop is called once for every attribute of every tuple in the
@ -239,6 +239,7 @@ brin_page_items(PG_FUNCTION_ARGS)
nulls[4] = true;
nulls[5] = true;
nulls[6] = true;
nulls[7] = true;
}
else
{
@ -261,6 +262,7 @@ brin_page_items(PG_FUNCTION_ARGS)
values[3] = BoolGetDatum(dtup->bt_columns[att].bv_allnulls);
values[4] = BoolGetDatum(dtup->bt_columns[att].bv_hasnulls);
values[5] = BoolGetDatum(dtup->bt_placeholder);
values[6] = BoolGetDatum(dtup->bt_empty_range);
if (!dtup->bt_columns[att].bv_allnulls)
{
BrinValues *bvalues = &dtup->bt_columns[att];
@ -286,12 +288,12 @@ brin_page_items(PG_FUNCTION_ARGS)
}
appendStringInfoChar(&s, '}');
values[6] = CStringGetTextDatum(s.data);
values[7] = CStringGetTextDatum(s.data);
pfree(s.data);
}
else
{
nulls[6] = true;
nulls[7] = true;
}
}

6
contrib/pageinspect/expected/brin.out
View File

@ -43,9 +43,9 @@ SELECT * FROM brin_revmap_data(get_raw_page('test1_a_idx', 1)) LIMIT 5;
SELECT * FROM brin_page_items(get_raw_page('test1_a_idx', 2), 'test1_a_idx')
ORDER BY blknum, attnum LIMIT 5;
itemoffset | blknum | attnum | allnulls | hasnulls | placeholder | value
------------+--------+--------+----------+----------+-------------+----------
1 | 0 | 1 | f | f | f | {1 .. 1}
itemoffset | blknum | attnum | allnulls | hasnulls | placeholder | empty | value
------------+--------+--------+----------+----------+-------------+-------+----------
1 | 0 | 1 | f | f | f | f | {1 .. 1}
(1 row)
-- Mask DETAIL messages as these are not portable across architectures.

17
contrib/pageinspect/pageinspect--1.11--1.12.sql
View File

@ -21,3 +21,20 @@ CREATE FUNCTION bt_multi_page_stats(IN relname text, IN blkno int8, IN blk_count
RETURNS SETOF record
AS 'MODULE_PATHNAME', 'bt_multi_page_stats'
LANGUAGE C STRICT PARALLEL RESTRICTED;
--
-- add information about BRIN empty ranges
--
DROP FUNCTION brin_page_items(IN page bytea, IN index_oid regclass);
CREATE FUNCTION brin_page_items(IN page bytea, IN index_oid regclass,
OUT itemoffset int,
OUT blknum int8,
OUT attnum int,
OUT allnulls bool,
OUT hasnulls bool,
OUT placeholder bool,
OUT empty bool,
OUT value text)
RETURNS SETOF record
AS 'MODULE_PATHNAME', 'brin_page_items'
LANGUAGE C STRICT PARALLEL RESTRICTED;