111 lines
3.6 KiB
Plaintext
111 lines
3.6 KiB
Plaintext
CREATE TABLE test1 (a int, b text);
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INSERT INTO test1 VALUES (1, 'one');
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CREATE INDEX test1_a_idx ON test1 USING brin (a);
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SELECT brin_page_type(get_raw_page('test1_a_idx', 0));
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brin_page_type
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----------------
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meta
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(1 row)
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SELECT brin_page_type(get_raw_page('test1_a_idx', 1));
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brin_page_type
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----------------
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revmap
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(1 row)
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SELECT brin_page_type(get_raw_page('test1_a_idx', 2));
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brin_page_type
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----------------
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regular
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(1 row)
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SELECT * FROM brin_metapage_info(get_raw_page('test1_a_idx', 0));
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magic | version | pagesperrange | lastrevmappage
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------------+---------+---------------+----------------
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0xA8109CFA | 1 | 128 | 1
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(1 row)
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SELECT * FROM brin_metapage_info(get_raw_page('test1_a_idx', 1));
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ERROR: page is not a BRIN page of type "metapage"
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DETAIL: Expected special type 0000f091, got 0000f092.
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SELECT * FROM brin_revmap_data(get_raw_page('test1_a_idx', 0)) LIMIT 5;
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ERROR: page is not a BRIN page of type "revmap"
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DETAIL: Expected special type 0000f092, got 0000f091.
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SELECT * FROM brin_revmap_data(get_raw_page('test1_a_idx', 1)) LIMIT 5;
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pages
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-------
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(2,1)
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(0,0)
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(0,0)
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(0,0)
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(0,0)
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(5 rows)
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SELECT * FROM brin_page_items(get_raw_page('test1_a_idx', 2), 'test1_a_idx')
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ORDER BY blknum, attnum LIMIT 5;
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itemoffset | blknum | attnum | allnulls | hasnulls | placeholder | empty | value
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------------+--------+--------+----------+----------+-------------+-------+----------
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1 | 0 | 1 | f | f | f | f | {1 .. 1}
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(1 row)
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-- Mask DETAIL messages as these are not portable across architectures.
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\set VERBOSITY terse
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-- Failures for non-BRIN index.
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CREATE INDEX test1_a_btree ON test1 (a);
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SELECT brin_page_items(get_raw_page('test1_a_btree', 0), 'test1_a_btree');
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ERROR: "test1_a_btree" is not a BRIN index
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SELECT brin_page_items(get_raw_page('test1_a_btree', 0), 'test1_a_idx');
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ERROR: input page is not a valid BRIN page
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-- Invalid special area size
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SELECT brin_page_type(get_raw_page('test1', 0));
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ERROR: input page is not a valid BRIN page
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SELECT * FROM brin_metapage_info(get_raw_page('test1', 0));
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ERROR: input page is not a valid BRIN page
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SELECT * FROM brin_revmap_data(get_raw_page('test1', 0));
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ERROR: input page is not a valid BRIN page
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\set VERBOSITY default
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-- Tests with all-zero pages.
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SHOW block_size \gset
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SELECT brin_page_type(decode(repeat('00', :block_size), 'hex'));
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brin_page_type
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----------------
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(1 row)
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SELECT brin_page_items(decode(repeat('00', :block_size), 'hex'), 'test1_a_idx');
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brin_page_items
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-----------------
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(0 rows)
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SELECT brin_metapage_info(decode(repeat('00', :block_size), 'hex'));
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brin_metapage_info
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--------------------
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(1 row)
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SELECT brin_revmap_data(decode(repeat('00', :block_size), 'hex'));
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brin_revmap_data
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------------------
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(1 row)
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-- Test that partial indexes have all pages, including empty ones.
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CREATE TABLE test2 (a int);
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INSERT INTO test2 SELECT i FROM generate_series(1,1000) s(i);
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-- No rows match the index predicate, make sure the index has the right number
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-- of ranges (same as number of page ranges).
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CREATE INDEX ON test2 USING brin (a) WITH (pages_per_range=1) WHERE (a IS NULL);
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ANALYZE test2;
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-- Does the index have one summary of the relation?
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SELECT (COUNT(*) = (SELECT relpages FROM pg_class WHERE relname = 'test2')) AS ranges_do_match
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FROM generate_series((SELECT (lastrevmappage + 1) FROM brin_metapage_info(get_raw_page('test2_a_idx', 0))),
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(SELECT (relpages - 1) FROM pg_class WHERE relname = 'test2_a_idx')) AS pages(p),
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LATERAL brin_page_items(get_raw_page('test2_a_idx', p), 'test2_a_idx') AS items;
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ranges_do_match
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-----------------
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t
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(1 row)
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DROP TABLE test1;
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DROP TABLE test2;
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