1
CREATE TABLE t1 (a VARCHAR(8), INDEX(a)) ENGINE=TokuDB;
2
INSERT INTO t1 VALUES ('foo'),('bar');
3
CREATE TABLE t2 AS SELECT 'qux' IN (SELECT a FROM t1) AS f1;
5
CREATE TABLE t1 (a INT);
6
INSERT INTO t1 VALUES (1),(2);
7
CREATE TABLE t2 (b INT);
8
INSERT INTO t2 VALUES (3),(4);
9
CREATE TABLE t3 (c VARCHAR(3), INDEX(c)) ENGINE=TokuDB;
10
INSERT INTO t3 VALUES ('foo'),('bar');
11
EXPLAIN SELECT * FROM t1 WHERE a IN (SELECT b FROM t2) OR 'qux' IN (SELECT c FROM t3);
12
id select_type table type possible_keys key key_len ref rows Extra
13
1 PRIMARY t1 ALL NULL NULL NULL NULL 2 Using where
14
3 SUBQUERY t3 index_subquery c c 6 const 0 Using index; Using where
15
2 MATERIALIZED t2 ALL NULL NULL NULL NULL 2
16
DROP TABLE t1, t2, t3;