CREATE OR REPLACE does not work with custom DATA/INDEX DIRECTORY

eval create table t (a int) engine=MyISAM data directory '$MYSQL_TMP_DIR';

eval create or replace table t (b int) engine=MyISAM data directory '$MYSQL_TMP_DIR';

# Cleanup

drop table t;

query 'create or replace table t (b int) engine=MyISAM data directory '$MYSQL_TMP_DIR'' failed: <Unknown> (1): Can't create/write to file '<basedir>/mysql-test/var/tmp/t.MYD' (Errcode: 17 "File exists")

eval create table t (a int) engine=MyISAM data directory '$MYSQL_TMP_DIR' index directory '$MYSQL_TMP_DIR';

eval create or replace table t (b int) engine=MyISAM data directory '$MYSQL_TMP_DIR' index directory '$MYSQL_TMP_DIR';

# Cleanup

drop table t;

query 'create or replace table t (b int) engine=MyISAM data directory '$MYSQL_TMP_DIR' index directory '$MYSQL_TMP_DIR'' failed: HA_ERR_TABLE_EXIST (156): MyISAM table '#sql-create-3c931d-4-t' is in use (most likely by a MERGE table). Try FLUSH TABLES.