Description:
When a primary index contains a blob field, creation of secondary index fails with
errormsg "BLOB/TEXT column used in key specification without keylength, even if the
secondary index doesn't contain a blob field

How to repeat:
create table my1 (a int, b int, c tinyblob, d int, e int);
alter table my1 add primary key (a,b,c(255),d);
alter table my1 add key (a,b,d,e);

ERROR 1170 (42000): BLOB/TEXT column 'c' used in key specification without a key length
5.0.9-beta-debug-log

Used to work with 5.0.6

A patch for this bug has been committed. After review, it may
be pushed to the relevant source trees for release in the next
version. You can access the patch from:

  http://lists.mysql.com/internals/26582

Fixed in 5.0.9.
Reviewed by Ramil.

Thank you for your bug report. This issue has been committed to our
source repository of that product and will be incorporated into the
next release.

If necessary, you can access the source repository and build the latest
available version, including the bugfix, yourself. More information 
about accessing the source trees is available at
    http://www.mysql.com/doc/en/Installing_source_tree.html

Additional info:

Bugfix documented in 5.0.9 change history; closed.