postgres/contrib/amcheck/sql/check_btree.sql

CREATE TABLE bttest_a(id int8);
CREATE TABLE bttest_b(id int8);
CREATE TABLE bttest_multi(id int8, data int8);
CREATE TABLE delete_test_table (a bigint, b bigint, c bigint, d bigint);

-- Stabalize tests
ALTER TABLE bttest_a SET (autovacuum_enabled = false);
ALTER TABLE bttest_b SET (autovacuum_enabled = false);
ALTER TABLE bttest_multi SET (autovacuum_enabled = false);
ALTER TABLE delete_test_table SET (autovacuum_enabled = false);

INSERT INTO bttest_a SELECT * FROM generate_series(1, 100000);
INSERT INTO bttest_b SELECT * FROM generate_series(100000, 1, -1);
INSERT INTO bttest_multi SELECT i, i%2  FROM generate_series(1, 100000) as i;

CREATE INDEX bttest_a_idx ON bttest_a USING btree (id) WITH (deduplicate_items = ON);
CREATE INDEX bttest_b_idx ON bttest_b USING btree (id);
CREATE UNIQUE INDEX bttest_multi_idx ON bttest_multi
USING btree (id) INCLUDE (data);

CREATE ROLE regress_bttest_role;

-- verify permissions are checked (error due to function not callable)
SET ROLE regress_bttest_role;
SELECT bt_index_check('bttest_a_idx'::regclass);
SELECT bt_index_parent_check('bttest_a_idx'::regclass);
RESET ROLE;

-- we, intentionally, don't check relation permissions - it's useful
-- to run this cluster-wide with a restricted account, and as tested
-- above explicit permission has to be granted for that.
GRANT EXECUTE ON FUNCTION bt_index_check(regclass) TO regress_bttest_role;
GRANT EXECUTE ON FUNCTION bt_index_parent_check(regclass) TO regress_bttest_role;
GRANT EXECUTE ON FUNCTION bt_index_check(regclass, boolean) TO regress_bttest_role;
GRANT EXECUTE ON FUNCTION bt_index_parent_check(regclass, boolean) TO regress_bttest_role;
SET ROLE regress_bttest_role;
SELECT bt_index_check('bttest_a_idx');
SELECT bt_index_parent_check('bttest_a_idx');
RESET ROLE;

-- verify plain tables are rejected (error)
SELECT bt_index_check('bttest_a');
SELECT bt_index_parent_check('bttest_a');

-- verify non-existing indexes are rejected (error)
SELECT bt_index_check(17);
SELECT bt_index_parent_check(17);

-- verify wrong index types are rejected (error)
BEGIN;
CREATE INDEX bttest_a_brin_idx ON bttest_a USING brin(id);
SELECT bt_index_parent_check('bttest_a_brin_idx');
ROLLBACK;

-- normal check outside of xact
SELECT bt_index_check('bttest_a_idx');
-- more expansive tests
SELECT bt_index_check('bttest_a_idx', true);
SELECT bt_index_parent_check('bttest_b_idx', true);

BEGIN;
SELECT bt_index_check('bttest_a_idx');
SELECT bt_index_parent_check('bttest_b_idx');
-- make sure we don't have any leftover locks
SELECT * FROM pg_locks
WHERE relation = ANY(ARRAY['bttest_a', 'bttest_a_idx', 'bttest_b', 'bttest_b_idx']::regclass[])
    AND pid = pg_backend_pid();
COMMIT;

-- Deduplication
TRUNCATE bttest_a;
INSERT INTO bttest_a SELECT 42 FROM generate_series(1, 2000);
SELECT bt_index_check('bttest_a_idx', true);

-- normal check outside of xact for index with included columns
SELECT bt_index_check('bttest_multi_idx');
-- more expansive tests for index with included columns
SELECT bt_index_parent_check('bttest_multi_idx', true, true);

-- repeat expansive tests for index built using insertions
TRUNCATE bttest_multi;
INSERT INTO bttest_multi SELECT i, i%2  FROM generate_series(1, 100000) as i;
SELECT bt_index_parent_check('bttest_multi_idx', true, true);

--
-- Test for multilevel page deletion/downlink present checks, and rootdescend
-- checks
--
INSERT INTO delete_test_table SELECT i, 1, 2, 3 FROM generate_series(1,80000) i;
ALTER TABLE delete_test_table ADD PRIMARY KEY (a,b,c,d);
-- Delete most entries, and vacuum, deleting internal pages and creating "fast
-- root"
DELETE FROM delete_test_table WHERE a < 79990;
VACUUM delete_test_table;
SELECT bt_index_parent_check('delete_test_table_pkey', true);

--
-- BUG #15597: must not assume consistent input toasting state when forming
-- tuple.  Bloom filter must fingerprint normalized index tuple representation.
--
CREATE TABLE toast_bug(buggy text);
ALTER TABLE toast_bug ALTER COLUMN buggy SET STORAGE extended;
CREATE INDEX toasty ON toast_bug(buggy);

-- pg_attribute entry for toasty.buggy (the index) will have plain storage:
UPDATE pg_attribute SET attstorage = 'p'
WHERE attrelid = 'toasty'::regclass AND attname = 'buggy';

-- Whereas pg_attribute entry for toast_bug.buggy (the table) still has extended storage:
SELECT attstorage FROM pg_attribute
WHERE attrelid = 'toast_bug'::regclass AND attname = 'buggy';

-- Insert compressible heap tuple (comfortably exceeds TOAST_TUPLE_THRESHOLD):
INSERT INTO toast_bug SELECT repeat('a', 2200);
-- Should not get false positive report of corruption:
SELECT bt_index_check('toasty', true);

--
-- Check that index expressions and predicates are run as the table's owner
--
TRUNCATE bttest_a;
INSERT INTO bttest_a SELECT * FROM generate_series(1, 1000);
ALTER TABLE bttest_a OWNER TO regress_bttest_role;
-- A dummy index function checking current_user
CREATE FUNCTION ifun(int8) RETURNS int8 AS $$
BEGIN
	ASSERT current_user = 'regress_bttest_role',
		format('ifun(%s) called by %s', $1, current_user);
	RETURN $1;
END;
$$ LANGUAGE plpgsql IMMUTABLE;

CREATE INDEX bttest_a_expr_idx ON bttest_a ((ifun(id) + ifun(0)))
	WHERE ifun(id + 10) > ifun(10);

SELECT bt_index_check('bttest_a_expr_idx', true);

-- cleanup
DROP TABLE bttest_a;
DROP TABLE bttest_b;
DROP TABLE bttest_multi;
DROP TABLE delete_test_table;
DROP TABLE toast_bug;
DROP FUNCTION ifun(int8);
DROP OWNED BY regress_bttest_role; -- permissions
DROP ROLE regress_bttest_role;