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mariadb/storage/tokudb/mysql-test/tokudb_mariadb/r/clustering.result
Sergei Golubchik 642aa4366d clustering == covering
tell the optimizer that every TokuDB "clustering" index is the "covering" index
in the MariaDB optimizer sense.
2013-09-09 14:00:06 +02:00

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create table t1 (a int, b int, c text, key (a) clustering=yes, key (b)) engine=tokudb;
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`a` int(11) DEFAULT NULL,
`b` int(11) DEFAULT NULL,
`c` text,
KEY `a` (`a`) `clustering`=yes,
KEY `b` (`b`)
) ENGINE=TokuDB DEFAULT CHARSET=latin1
insert t1 values (1, 1, 1);
insert t1 select a+1, a+1, a+1 from t1;
insert t1 select a+2, a+2, a+2 from t1;
insert t1 select a+4, a+4, a+4 from t1;
select * from t1;
a b c
1 1 1
2 2 2
3 3 3
4 4 4
5 5 5
6 6 6
7 7 7
8 8 8
explain select a,c from t1 where a > 2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a a 5 NULL 6 Using where; Using index
explain select b,c from t1 where b > 2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL b NULL NULL NULL 8 Using where
drop table t1;