SET @saved_frequency = @@GLOBAL.innodb_purge_rseg_truncate_frequency;
SET GLOBAL innodb_purge_rseg_truncate_frequency = 1;
create table t (
b point not null,d point not null, spatial key (d),spatial key (b)
) engine=innodb;
InnoDB		0 transactions not purged
drop table t;
SET GLOBAL innodb_purge_rseg_truncate_frequency = @saved_frequency;