LOAD DATA REPLACE into ucs2-encoded FK field fails

--source include/have_innodb.inc

create table t1 (

  pk int primary key,

  f char(10) character set ucs2,

  key(f)

) engine=innodb;

create table t2 (

  pk int primary key,

  f13 char(10) character set ucs2

) engine=innodb;

set foreign_key_checks = off;

alter table t2 add foreign key (f13) references t1 (f) on delete set null;

set foreign_key_checks = on;

insert into t1 values (1,'q');

insert into t2(pk, f13) values (1, 'q'), (2, 'q');

select * from t2 into outfile 't2.data';

load data infile 't2.data' replace into table t2;

# cleanup

drop table t2, t1;

mysqltest: At line 26: query 'load data infile 't2.data' replace

into table t2' failed: 1452: Cannot add or update a child row:

a foreign key constraint fails (`test`.`t2`, CONSTRAINT `t2_ibfk_1` 

FOREIGN KEY (`f13`) REFERENCES `t1` (`f`) ON DELETE SET NULL)

create table t1 (

  pk int primary key,

  f char(10) character set ucs2,

  key(f)

) engine=innodb;

create table t2 (

  pk int primary key,

  f13 char(10) character set ucs2 references t1 (f) on delete set null

) engine=innodb;

insert into t1 values (1,'q');

insert into t2(pk, f13) values (1, 'q'), (2, 'q');

select * from t2 into outfile 't2.data';

load data infile 't2.data' replace into table t2;

# cleanup

drop table t2, t1;