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# # Bug #29207450 TINYTEXT COLUMN TAKES LONG TIME IN THE GROUP BY OPERATION. # create table t1 (id serial primary key auto_increment,a varchar(100),b varchar(100)); create table t2 (id serial primary key auto_increment,a varchar(100),b tinytext); insert into t1 (a, b) values('a', '746d847beb7e'),('a','746d847beb7e'),('a', '746d847beb7e'),('a','746d847beb7e'),('a','746d847beb7e'); insert into t1 (a, b) select 'a', '746d847beb7e' from t1 t1,t1 t2,t1 t3,t1 t4; insert into t1 (a, b) select 'a', '746d847beb7e' from t1 t1,t1 t2; insert into t2 (a, b) values('a', '746d847beb7e'),('a','746d847beb7e'),('a', '746d847beb7e'),('a','746d847beb7e'),('a','746d847beb7e'); insert into t2 (a, b) select 'a', '746d847beb7e' from t2 t1,t2 t2,t2 t3,t2 t4; insert into t2 (a, b) select 'a', '746d847beb7e' from t2 t1,t2 t2; select count(*) from t1; count(*) 397530 select count(*) from t2; count(*) 397530 set global internal_tmp_disk_storage_engine = 'innodb'; select b, count(*) from t1 group by b; b count(*) 746d847beb7e 397530 select b, count(*) from t2 group by b; b count(*) 746d847beb7e 397530 set global internal_tmp_disk_storage_engine = 'myisam'; select b, count(*) from t1 group by b; b count(*) 746d847beb7e 397530 select b, count(*) from t2 group by b; b count(*) 746d847beb7e 397530 set global internal_tmp_disk_storage_engine = default; drop table t1, t2;