Using too big key for internal temp tables

CREATE TABLE t1 (i INT, state VARCHAR(995)) ENGINE=MyISAM;

INSERT INTO t1 VALUES (2,'Louisiana'),(9,'Maine');

CREATE TABLE t2 (state VARCHAR(995), j INT) ENGINE=MyISAM;

INSERT INTO t2 VALUES ('Louisiana',9),('Alaska',5);

INSERT INTO t2 SELECT t2.* FROM t2 JOIN t2 AS t3 JOIN t2 AS t4 JOIN t2 AS t5;

SET @@max_heap_table_size= 16384;

set @@optimizer_switch='derived_merge=OFF';

SELECT * FROM t1 AS t1_1 LEFT JOIN ( t1 AS t1_2 INNER JOIN (SELECT * FROM t2) v2 ON t1_2.i = j ) ON t1_1.state = v2.state;

DROP TABLE t1, t2;