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# Tests for locking conflicts with TRUNCATE commands.
setup
{
CREATE ROLE regress_truncate_conflict;
CREATE TABLE truncate_tab (a int);
}
teardown
{
DROP TABLE truncate_tab;
DROP ROLE regress_truncate_conflict;
}
session s1
step s1_begin { BEGIN; }
step s1_tab_lookup { SELECT count(*) >= 0 FROM truncate_tab; }
step s1_commit { COMMIT; }
session s2
step s2_grant { GRANT TRUNCATE ON truncate_tab TO regress_truncate_conflict; }
step s2_auth { SET ROLE regress_truncate_conflict; }
step s2_truncate { TRUNCATE truncate_tab; }
step s2_reset { RESET ROLE; }
# The role doesn't have privileges to truncate the table, so TRUNCATE should
# immediately fail without waiting for a lock.
permutation s1_begin s1_tab_lookup s2_auth s2_truncate s1_commit s2_reset
permutation s1_begin s2_auth s2_truncate s1_tab_lookup s1_commit s2_reset
permutation s1_begin s2_auth s1_tab_lookup s2_truncate s1_commit s2_reset
permutation s2_auth s2_truncate s1_begin s1_tab_lookup s1_commit s2_reset
# The role has privileges to truncate the table, TRUNCATE will block if
# another session holds a lock on the table and succeed in all cases.
permutation s1_begin s1_tab_lookup s2_grant s2_auth s2_truncate s1_commit s2_reset
permutation s1_begin s2_grant s2_auth s2_truncate s1_tab_lookup s1_commit s2_reset
permutation s1_begin s2_grant s2_auth s1_tab_lookup s2_truncate s1_commit s2_reset
permutation s2_grant s2_auth s2_truncate s1_begin s1_tab_lookup s1_commit s2_reset
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