error when loading data from file using default or null value

drizzle> create table t1 (i int, t timestamp default Now(), i2 int);
Query OK, 0 rows affected (0.01 sec)

drizzle> insert into t1 VALUES (10,default,199);
Query OK, 1 row affected (0 sec)

drizzle> select * from t1;
+------+---------------------+------+
| i | t | i2 |
+------+---------------------+------+
| 10 | 2009-12-14 17:26:43 | 199 |
+------+---------------------+------+
1 row in set (0 sec)

drizzle> insert into t1 (i,i2) VALUES (10,199);
Query OK, 1 row affected (0.01 sec)

drizzle> select * from t1;
+------+---------------------+------+
| i | t | i2 |
+------+---------------------+------+
| 10 | 2009-12-14 17:26:43 | 199 |
| 10 | 2009-12-14 17:27:33 | 199 |
+------+---------------------+------+
2 rows in set (0 sec)

drizzle> LOAD DATA INFILE '/tmp/data' INTO TABLE t1 FIELDS TERMINATED BY '\t';
ERROR 1685 (HY000): Received an invalid value '' for a UNIX timestamp.

where /tmp/data is
10\t\t1099

drizzle> LOAD DATA INFILE '/tmp/data' INTO TABLE t1 FIELDS TERMINATED BY '\t';
ERROR 1685 (HY000): Received an invalid value 'default' for a UNIX timestamp.

where /tmp/data is
10\tdefault\t1099

drizzle> LOAD DATA INFILE '/tmp/data' INTO TABLE t1 FIELDS TERMINATED BY '\t';
Query OK, 1 row affected (0.02 sec)
Records: 1 Deleted: 0 Skipped: 0 Warnings: 0

where /tmp/data is
10\t2009-12-15\t1099

drizzle> select * from t1;
+------+---------------------+------+
| i | t | i2 |
+------+---------------------+------+
| 10 | 2009-12-14 17:26:43 | 199 |
| 10 | 2009-12-14 17:27:33 | 199 |
| 2 | 2009-12-15 00:00:00 | 1099 |
+------+---------------------+------+
3 rows in set (0 sec)