CREATE TABLE test_hash (a int, b text);
INSERT INTO test_hash VALUES (1, 'one');
CREATE INDEX test_hash_a_idx ON test_hash USING hash (a);
\x
SELECT hash_page_type(get_raw_page('test_hash_a_idx', 0));
-[ RECORD 1 ]--+---------
hash_page_type | metapage

SELECT hash_page_type(get_raw_page('test_hash_a_idx', 1));
-[ RECORD 1 ]--+-------
hash_page_type | bucket

SELECT hash_page_type(get_raw_page('test_hash_a_idx', 2));
-[ RECORD 1 ]--+-------
hash_page_type | bucket

SELECT hash_page_type(get_raw_page('test_hash_a_idx', 3));
-[ RECORD 1 ]--+-------
hash_page_type | bucket

SELECT hash_page_type(get_raw_page('test_hash_a_idx', 4));
-[ RECORD 1 ]--+-------
hash_page_type | bucket

SELECT hash_page_type(get_raw_page('test_hash_a_idx', 5));
-[ RECORD 1 ]--+-------
hash_page_type | bitmap

SELECT hash_page_type(get_raw_page('test_hash_a_idx', 6));
ERROR:  block number 6 is out of range for relation "test_hash_a_idx"
SELECT * FROM hash_bitmap_info('test_hash_a_idx', -1);
ERROR:  invalid block number
SELECT * FROM hash_bitmap_info('test_hash_a_idx', 0);
ERROR:  invalid overflow block number 0
SELECT * FROM hash_bitmap_info('test_hash_a_idx', 1);
ERROR:  invalid overflow block number 1
SELECT * FROM hash_bitmap_info('test_hash_a_idx', 2);
ERROR:  invalid overflow block number 2
SELECT * FROM hash_bitmap_info('test_hash_a_idx', 3);
ERROR:  invalid overflow block number 3
SELECT * FROM hash_bitmap_info('test_hash_a_idx', 4);
ERROR:  invalid overflow block number 4
SELECT * FROM hash_bitmap_info('test_hash_a_idx', 5);
ERROR:  invalid overflow block number 5
SELECT * FROM hash_bitmap_info('test_hash_a_idx', 6);
ERROR:  block number 6 is out of range for relation "test_hash_a_idx"
SELECT magic, version, ntuples, bsize, bmsize, bmshift, maxbucket, highmask,
lowmask, ovflpoint, firstfree, nmaps, procid, spares, mapp FROM
hash_metapage_info(get_raw_page('test_hash_a_idx', 0));
-[ RECORD 1 ]--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
magic     | 105121344
version   | 4
ntuples   | 1
bsize     | 8152
bmsize    | 4096
bmshift   | 15
maxbucket | 3
highmask  | 7
lowmask   | 3
ovflpoint | 2
firstfree | 0
nmaps     | 1
procid    | 450
spares    | {0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}
mapp      | {5,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}

SELECT magic, version, ntuples, bsize, bmsize, bmshift, maxbucket, highmask,
lowmask, ovflpoint, firstfree, nmaps, procid, spares, mapp FROM
hash_metapage_info(get_raw_page('test_hash_a_idx', 1));
ERROR:  page is not a hash meta page
SELECT magic, version, ntuples, bsize, bmsize, bmshift, maxbucket, highmask,
lowmask, ovflpoint, firstfree, nmaps, procid, spares, mapp FROM
hash_metapage_info(get_raw_page('test_hash_a_idx', 2));
ERROR:  page is not a hash meta page
SELECT magic, version, ntuples, bsize, bmsize, bmshift, maxbucket, highmask,
lowmask, ovflpoint, firstfree, nmaps, procid, spares, mapp FROM
hash_metapage_info(get_raw_page('test_hash_a_idx', 3));
ERROR:  page is not a hash meta page
SELECT magic, version, ntuples, bsize, bmsize, bmshift, maxbucket, highmask,
lowmask, ovflpoint, firstfree, nmaps, procid, spares, mapp FROM
hash_metapage_info(get_raw_page('test_hash_a_idx', 4));
ERROR:  page is not a hash meta page
SELECT magic, version, ntuples, bsize, bmsize, bmshift, maxbucket, highmask,
lowmask, ovflpoint, firstfree, nmaps, procid, spares, mapp FROM
hash_metapage_info(get_raw_page('test_hash_a_idx', 5));
ERROR:  page is not a hash meta page
SELECT live_items, dead_items, page_size, hasho_prevblkno, hasho_nextblkno,
hasho_bucket, hasho_flag, hasho_page_id FROM
hash_page_stats(get_raw_page('test_hash_a_idx', 0));
ERROR:  page is not a hash bucket or overflow page
SELECT live_items, dead_items, page_size, hasho_prevblkno, hasho_nextblkno,
hasho_bucket, hasho_flag, hasho_page_id FROM
hash_page_stats(get_raw_page('test_hash_a_idx', 1));
-[ RECORD 1 ]---+-----------
live_items      | 0
dead_items      | 0
page_size       | 8192
hasho_prevblkno | 3
hasho_nextblkno | 4294967295
hasho_bucket    | 0
hasho_flag      | 2
hasho_page_id   | 65408

SELECT live_items, dead_items, page_size, hasho_prevblkno, hasho_nextblkno,
hasho_bucket, hasho_flag, hasho_page_id FROM
hash_page_stats(get_raw_page('test_hash_a_idx', 2));
-[ RECORD 1 ]---+-----------
live_items      | 0
dead_items      | 0
page_size       | 8192
hasho_prevblkno | 3
hasho_nextblkno | 4294967295
hasho_bucket    | 1
hasho_flag      | 2
hasho_page_id   | 65408

SELECT live_items, dead_items, page_size, hasho_prevblkno, hasho_nextblkno,
hasho_bucket, hasho_flag, hasho_page_id FROM
hash_page_stats(get_raw_page('test_hash_a_idx', 3));
-[ RECORD 1 ]---+-----------
live_items      | 1
dead_items      | 0
page_size       | 8192
hasho_prevblkno | 3
hasho_nextblkno | 4294967295
hasho_bucket    | 2
hasho_flag      | 2
hasho_page_id   | 65408

SELECT live_items, dead_items, page_size, hasho_prevblkno, hasho_nextblkno,
hasho_bucket, hasho_flag, hasho_page_id FROM
hash_page_stats(get_raw_page('test_hash_a_idx', 4));
-[ RECORD 1 ]---+-----------
live_items      | 0
dead_items      | 0
page_size       | 8192
hasho_prevblkno | 3
hasho_nextblkno | 4294967295
hasho_bucket    | 3
hasho_flag      | 2
hasho_page_id   | 65408

SELECT live_items, dead_items, page_size, hasho_prevblkno, hasho_nextblkno,
hasho_bucket, hasho_flag, hasho_page_id FROM
hash_page_stats(get_raw_page('test_hash_a_idx', 5));
ERROR:  page is not a hash bucket or overflow page
SELECT * FROM hash_page_items(get_raw_page('test_hash_a_idx', 0));
ERROR:  page is not a hash bucket or overflow page
SELECT * FROM hash_page_items(get_raw_page('test_hash_a_idx', 1));
(0 rows)

SELECT * FROM hash_page_items(get_raw_page('test_hash_a_idx', 2));
(0 rows)

SELECT * FROM hash_page_items(get_raw_page('test_hash_a_idx', 3));
-[ RECORD 1 ]----------
itemoffset | 1
ctid       | (0,1)
data       | 2389907270

SELECT * FROM hash_page_items(get_raw_page('test_hash_a_idx', 4));
(0 rows)

SELECT * FROM hash_page_items(get_raw_page('test_hash_a_idx', 5));
ERROR:  page is not a hash bucket or overflow page
-- Failure with non-hash index
CREATE INDEX test_hash_a_btree ON test_hash USING btree (a);
SELECT hash_bitmap_info('test_hash_a_btree', 0);
ERROR:  "test_hash_a_btree" is not a hash index
-- Failure with various modes.
-- Suppress the DETAIL message, to allow the tests to work across various
-- page sizes and architectures.
\set VERBOSITY terse
-- invalid page size
SELECT hash_metapage_info('aaa'::bytea);
ERROR:  invalid page size
SELECT hash_page_items('bbb'::bytea);
ERROR:  invalid page size
SELECT hash_page_stats('ccc'::bytea);
ERROR:  invalid page size
SELECT hash_page_type('ddd'::bytea);
ERROR:  invalid page size
-- invalid special area size
SELECT hash_metapage_info(get_raw_page('test_hash', 0));
ERROR:  input page is not a valid hash page
SELECT hash_page_items(get_raw_page('test_hash', 0));
ERROR:  input page is not a valid hash page
SELECT hash_page_stats(get_raw_page('test_hash', 0));
ERROR:  input page is not a valid hash page
SELECT hash_page_type(get_raw_page('test_hash', 0));
ERROR:  input page is not a valid hash page
\set VERBOSITY default
-- Tests with all-zero pages.
SHOW block_size \gset
SELECT hash_metapage_info(decode(repeat('00', :block_size), 'hex'));
ERROR:  page is not a hash meta page
SELECT hash_page_items(decode(repeat('00', :block_size), 'hex'));
ERROR:  page is not a hash bucket or overflow page
SELECT hash_page_stats(decode(repeat('00', :block_size), 'hex'));
ERROR:  page is not a hash bucket or overflow page
SELECT hash_page_type(decode(repeat('00', :block_size), 'hex'));
-[ RECORD 1 ]--+-------
hash_page_type | unused

DROP TABLE test_hash;