From 725b43b9c3b3c25c60ac717c41047ad0dffb1312 Mon Sep 17 00:00:00 2001 From: Peter Geoghegan Date: Fri, 31 Jul 2020 15:34:26 -0700 Subject: [PATCH] Restore lost amcheck TOAST test coverage. Commit eba77534 fixed an amcheck false positive bug involving inconsistencies in TOAST input state between table and index. A test case was added that verified that such an inconsistency didn't result in a spurious corruption related error. Test coverage from the test was accidentally lost by commit 501e41dd, which propagated ALTER TABLE ... SET STORAGE attstorage state to indexes. This broke the test because the test specifically relied on attstorage not being propagated. This artificially forced there to be index tuples whose datums were equivalent to the datums in the heap without the datums actually being bitwise equal. Fix this by updating pg_attribute directly instead. Commit 501e41dd made similar changes to a test_decoding TOAST-related test case which made the same assumption, but overlooked the amcheck test case. Backpatch: 11-, just like commit eba77534 (and commit 501e41dd). --- contrib/amcheck/expected/check_btree.out | 16 ++++++++++++---- contrib/amcheck/sql/check_btree.sql | 14 ++++++++++---- 2 files changed, 22 insertions(+), 8 deletions(-) diff --git a/contrib/amcheck/expected/check_btree.out b/contrib/amcheck/expected/check_btree.out index f82f48d23b..13848b7449 100644 --- a/contrib/amcheck/expected/check_btree.out +++ b/contrib/amcheck/expected/check_btree.out @@ -155,11 +155,19 @@ SELECT bt_index_parent_check('delete_test_table_pkey', true); -- tuple. Bloom filter must fingerprint normalized index tuple representation. -- CREATE TABLE toast_bug(buggy text); -ALTER TABLE toast_bug ALTER COLUMN buggy SET STORAGE plain; --- pg_attribute entry for toasty.buggy will have plain storage: -CREATE INDEX toasty ON toast_bug(buggy); --- Whereas pg_attribute entry for toast_bug.buggy now has extended storage: 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'; + attstorage +------------ + x +(1 row) + -- 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: diff --git a/contrib/amcheck/sql/check_btree.sql b/contrib/amcheck/sql/check_btree.sql index a1fef644cb..97a3e1a20d 100644 --- a/contrib/amcheck/sql/check_btree.sql +++ b/contrib/amcheck/sql/check_btree.sql @@ -99,11 +99,17 @@ SELECT bt_index_parent_check('delete_test_table_pkey', true); -- tuple. Bloom filter must fingerprint normalized index tuple representation. -- CREATE TABLE toast_bug(buggy text); -ALTER TABLE toast_bug ALTER COLUMN buggy SET STORAGE plain; --- pg_attribute entry for toasty.buggy will have plain storage: -CREATE INDEX toasty ON toast_bug(buggy); --- Whereas pg_attribute entry for toast_bug.buggy now has extended storage: 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: