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SET @saved_frequency = @@GLOBAL.innodb_purge_rseg_truncate_frequency;
SET GLOBAL innodb_purge_rseg_truncate_frequency=1;
#
# MDEV-17793 Crash in purge after instant DROP and emptying the table
#
connect prevent_purge,localhost,root;
START TRANSACTION WITH CONSISTENT SNAPSHOT;
connection default;
CREATE TABLE t1 (f1 INT, f2 INT) ENGINE=InnoDB;
INSERT INTO t1 () VALUES ();
ALTER TABLE t1 DROP f2, ADD COLUMN f2 INT;
ALTER TABLE t1 DROP f1;
DELETE FROM t1;
connection prevent_purge;
COMMIT;
START TRANSACTION WITH CONSISTENT SNAPSHOT;
connection default;
ALTER TABLE t1 ADD COLUMN extra TINYINT UNSIGNED NOT NULL DEFAULT 42;
InnoDB 1 transactions not purged
ALTER TABLE t1 DROP extra;
disconnect prevent_purge;
InnoDB 0 transactions not purged
DROP TABLE t1;
SET GLOBAL innodb_purge_rseg_truncate_frequency = @saved_frequency;
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