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--
-- Verify that index scans encountering dead rows produced by an
-- aborted subtransaction of the current transaction can utilize the
-- kill_prior_tuple optimization
--
-- NB: The table size is currently *not* expected to stay the same, we
-- don't have logic to trigger opportunistic pruning in cases like
-- this.
BEGIN;
SET LOCAL enable_seqscan = false;
SET LOCAL enable_indexonlyscan = false;
SET LOCAL enable_bitmapscan = false;
-- Can't easily use a unique index, since dead tuples can be found
-- independent of the kill_prior_tuples optimization.
CREATE TABLE clean_aborted_self(key int, data text);
CREATE INDEX clean_aborted_self_key ON clean_aborted_self(key);
INSERT INTO clean_aborted_self (key, data) VALUES (-1, 'just to allocate metapage');
-- save index size from before the changes, for comparison
SELECT pg_relation_size('clean_aborted_self_key') AS clean_aborted_self_key_before \gset
DO $$
BEGIN
-- iterate often enough to see index growth even on larger-than-default page sizes
FOR i IN 1..100 LOOP
BEGIN
-- perform index scan over all the inserted keys to get them to be seen as dead
IF EXISTS(SELECT * FROM clean_aborted_self WHERE key > 0 AND key < 100) THEN
RAISE data_corrupted USING MESSAGE = 'these rows should not exist';
END IF;
INSERT INTO clean_aborted_self SELECT g.i, 'rolling back in a sec' FROM generate_series(1, 100) g(i);
-- just some error that's not normally thrown
RAISE reading_sql_data_not_permitted USING MESSAGE = 'round and round again';
EXCEPTION WHEN reading_sql_data_not_permitted THEN END;
END LOOP;
END;$$;
-- show sizes only if they differ
SELECT :clean_aborted_self_key_before AS size_before, pg_relation_size('clean_aborted_self_key') size_after
WHERE :clean_aborted_self_key_before != pg_relation_size('clean_aborted_self_key');
size_before | size_after
-------------+------------
(0 rows)
ROLLBACK;
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