Bug #10617 Insert from same table to same table give incorrect result for bit(4) column.

Description:
If we insert from same table to same table having a bit column with length 4 then incorrect result is observed fro bit column.

How to repeat:
1. Start the MySQL client and connect to the database with valid user and password.
2. Set the delimiter to //
3. Create a table with an integer and a bit column having length 4 and insert values in it as follows:
   create table t1(f1 int, f2 bit(4))//
   insert into t1 values(1,1),(2,2),(3,3),(4,4),(5,5)//

4. Now insert values from the same table to the same table as follows:
   insert into t1 select * from t1//

Expected Results: 
1. The insert should succeed by inserting all the values again to the same table.

Actual Results: 
1. For the bit column the last value is repeated for all new rows inserted. The resultant table contents are as follows:

   mysql> select f1,Bin(f2+0) from t1//
   +------+-----------+
   | f1   | Bin(f2+0) |
   +------+-----------+
   |    1 | 1         |
   |    2 | 10        |
   |    3 | 11        |
   |    4 | 100       |
   |    5 | 101       |
   |    1 | 101       |
   |    2 | 101       |
   |    3 | 101       |
   |    4 | 101       |
   |    5 | 101       |
   +------+-----------+
   10 rows in set (0.00 sec)
   
   mysql>
   
2. Please note the correct values for the integer field f1.

Verified on linux with latest 5.0bk, 4.1.11 works as expected

fixed in 5.0.9

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next release.

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Additional info:

Documented fix in 5.0.9 change history; closed.