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Teach contrib/amcheck to check the unique constraint violation

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Add the 'checkunique' argument to bt_index_check() and bt_index_parent_check().
When the flag is specified the procedures will check the unique constraint
violation for unique indexes.  Only one heap entry for all equal keys in
the index should be visible (including posting list entries).  Report an error
otherwise.

pg_amcheck called with the --checkunique option will do the same check for all
the indexes it checks.

Author: Anastasia Lubennikova <lubennikovaav@gmail.com>
Author: Pavel Borisov <pashkin.elfe@gmail.com>
Author: Maxim Orlov <orlovmg@gmail.com>
Reviewed-by: Mark Dilger <mark.dilger@enterprisedb.com>
Reviewed-by: Zhihong Yu <zyu@yugabyte.com>
Reviewed-by: Peter Geoghegan <pg@bowt.ie>
Reviewed-by: Aleksander Alekseev <aleksander@timescale.com>
Discussion: https://postgr.es/m/CALT9ZEHRn5xAM5boga0qnrCmPV52bScEK2QnQ1HmUZDD301JEg%40mail.gmail.com
This commit is contained in:
Alexander Korotkov
2023-10-28 00:21:23 +03:00
parent 8b62b441ff
commit 5ae2087202
13 changed files with 830 additions and 23 deletions
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14
contrib/amcheck/sql/check_btree.sql
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@ -135,6 +135,19 @@ CREATE INDEX bttest_a_expr_idx ON bttest_a ((ifun(id) + ifun(0)))
SELECT bt_index_check('bttest_a_expr_idx', true);
-- UNIQUE constraint check
SELECT bt_index_check('bttest_a_idx', heapallindexed => true, checkunique => true);
SELECT bt_index_check('bttest_b_idx', heapallindexed => false, checkunique => true);
SELECT bt_index_parent_check('bttest_a_idx', heapallindexed => true, rootdescend => true, checkunique => true);
SELECT bt_index_parent_check('bttest_b_idx', heapallindexed => true, rootdescend => false, checkunique => true);
-- Check that null values in an unique index are not treated as equal
CREATE TABLE bttest_unique_nulls (a serial, b int, c int UNIQUE);
INSERT INTO bttest_unique_nulls VALUES (generate_series(1, 10000), 2, default);
SELECT bt_index_check('bttest_unique_nulls_c_key', heapallindexed => true, checkunique => true);
CREATE INDEX on bttest_unique_nulls (b,c);
SELECT bt_index_check('bttest_unique_nulls_b_c_idx', heapallindexed => true, checkunique => true);
-- cleanup
DROP TABLE bttest_a;
DROP TABLE bttest_b;
@ -142,5 +155,6 @@ DROP TABLE bttest_multi;
DROP TABLE delete_test_table;
DROP TABLE toast_bug;
DROP FUNCTION ifun(int8);
DROP TABLE bttest_unique_nulls;
DROP OWNED BY regress_bttest_role; -- permissions
DROP ROLE regress_bttest_role;