# Test for interactions of tuple freezing with dead, as well as recently-dead
# tuples using multixacts via FOR KEY SHARE.
setup
{
  DROP TABLE IF EXISTS tab_freeze;
  CREATE TABLE tab_freeze (
    id int PRIMARY KEY,
    name char(3),
    x int);
  INSERT INTO tab_freeze VALUES (1, '111', 0);
  INSERT INTO tab_freeze VALUES (3, '333', 0);
}

teardown
{
  DROP TABLE tab_freeze;
}

session "s1"
step "s1_begin"		{ BEGIN; }
step "s1_update"	{ UPDATE tab_freeze SET x = x + 1 WHERE id = 3; }
step "s1_commit"	{ COMMIT; }
step "s1_vacuum"	{ VACUUM FREEZE tab_freeze; }
step "s1_selectone"	{
    BEGIN;
    SET LOCAL enable_seqscan = false;
    SET LOCAL enable_bitmapscan = false;
    SELECT * FROM tab_freeze WHERE id = 3;
    COMMIT;
}
step "s1_selectall"	{ SELECT * FROM tab_freeze ORDER BY name, id; }

session "s2"
step "s2_begin"		{ BEGIN; }
step "s2_key_share"	{ SELECT id FROM tab_freeze WHERE id = 3 FOR KEY SHARE; }
step "s2_commit"	{ COMMIT; }
step "s2_vacuum"	{ VACUUM FREEZE tab_freeze; }

session "s3"
step "s3_begin"		{ BEGIN; }
step "s3_key_share"	{ SELECT id FROM tab_freeze WHERE id = 3 FOR KEY SHARE; }
step "s3_commit"	{ COMMIT; }
step "s3_vacuum"	{ VACUUM FREEZE tab_freeze; }

# This permutation verfies that a previous bug
#     https://postgr.es/m/E5711E62-8FDF-4DCA-A888-C200BF6B5742@amazon.com
#     https://postgr.es/m/20171102112019.33wb7g5wp4zpjelu@alap3.anarazel.de
# is not reintroduced. We used to make wrong pruning / freezing
# decision for multixacts, which could lead to a) broken hot chains b)
# dead rows being revived.
permutation "s1_begin" "s2_begin" "s3_begin" # start transactions
   "s1_update" "s2_key_share" "s3_key_share" # have xmax be a multi with an updater, updater being oldest xid
   "s1_update" # create additional row version that has multis
   "s1_commit" "s2_commit" # commit both updater and share locker
   "s2_vacuum" # due to bug in freezing logic, we used to *not* prune updated row, and then froze it
   "s1_selectone" # if hot chain is broken, the row can't be found via index scan
   "s3_commit" # commit remaining open xact
   "s2_vacuum" # pruning / freezing in broken hot chains would unset xmax, reviving rows
   "s1_selectall" # show borkedness