Bug #15523 ALTER TABLE ... PARTITION BY does not work in 5.1.3

Description:
Syntax for ALTER TABLE ... PARTITION BY is accepted in MySQL 5.1.3, but the statement has no effect.

How to repeat:
create table t1 (a int);
show create table t1;
alter table t1 partition by key(a) partitions 2;
show create table t1;

Note that no partition-related files appear in the data directory either (so this is not just a .frm problem).

Suggested fix:
ALTER TABLE ... PARTITION BY should work as expected

Are you running a -max build? I've found that this functionality only exists when running a -max build, not the standard one.

mysql 5.1.3-alpha-max (root) "test"> select version();
+-----------------+
| version()       |
+-----------------+
| 5.1.3-alpha-max |
+-----------------+
1 row in set (0.00 sec)

mysql 5.1.3-alpha-max (root) "test"> show variables like 'version_comment';
+-----------------+----------------------------------------------+
| Variable_name   | Value                                        |
+-----------------+----------------------------------------------+
| version_comment | MySQL Community Edition - Experimental (GPL) |
+-----------------+----------------------------------------------+
1 row in set (0.00 sec)

Issue still exists in 5.1.4-alpha-max.

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/commits/1511

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:

Documented fix in 5.1.6 changelog; updated Manual; closed.