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Fix wrong validation of top-parent pointer during page deletion in Btree.

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After introducing usage of t_tid of inner or page high key for storing
number of attributes of tuple, validation of tuple's ItemPointer with
ItemPointerIsValid becomes incorrect, it's need to validate only blocknumber of
ItemPointer. Missing this causes a incorrect page deletion, fix that. Test is
added.

BTW, current contrib/amcheck doesn't fail on index corrupted by this way.

Also introduce BTreeTupleGetTopParent/BTreeTupleSetTopParent macroses to improve
code readability and to avoid possible confusion with page high key: high key
is used to store top-parent link for branch to remove.

Bug found by Michael Paquier, but bug doesn't exist in previous versions because
t_tid was set to P_HIKEY.

Author: Teodor Sigaev
Reviewer: Peter Geoghegan
Discussion: https://www.postgresql.org/message-id/flat/20180419052436.GA16000%40paquier.xyz
This commit is contained in:
Teodor Sigaev
2018-04-23 15:55:10 +03:00
parent 6a7b2ce2bd
commit 6db4b49986
6 changed files with 46 additions and 23 deletions
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10
src/test/regress/expected/create_index.out
View File

@ -3052,6 +3052,16 @@ explain (costs off)
Filter: (NOT b)
(4 rows)
--
-- Test for multilevel page deletion
--
CREATE TABLE delete_test_table (a bigint, b bigint, c bigint, d bigint);
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 FROM delete_test_table WHERE a > 40000;
VACUUM delete_test_table;
DELETE FROM delete_test_table WHERE a > 10;
VACUUM delete_test_table;
--
-- REINDEX (VERBOSE)
--

1
src/test/regress/expected/sanity_check.out
View File

@ -38,6 +38,7 @@ d_star|f
date_tbl|f
default_tbl|f
defaultexpr_tbl|f
delete_test_table|t
dept|f
dupindexcols|t
e_star|f

11
src/test/regress/sql/create_index.sql
View File

@ -1061,6 +1061,17 @@ explain (costs off)
explain (costs off)
select * from boolindex where not b order by i limit 10;
--
-- Test for multilevel page deletion
--
CREATE TABLE delete_test_table (a bigint, b bigint, c bigint, d bigint);
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 FROM delete_test_table WHERE a > 40000;
VACUUM delete_test_table;
DELETE FROM delete_test_table WHERE a > 10;
VACUUM delete_test_table;
--
-- REINDEX (VERBOSE)
--