According to some internal communication, these two functions are place
holders for future enhancements. Because they use a variable number of
parameters, the implementation defined a reserved keyword for them in the
parser grammar.

Unfortunately, doing so creates a bug similar to Bug 21114 reported for the
function FORMAT.

In the 5.1 code base, due to improvements in the code implemented with bug
21114, having a reserved keyword for functions with a variable number of
arguments is not needed any more by the implementation.

As a result, this fix removes the place-holder implementation, and removes
the unnecessary reserved keywords. Should the functions UNIQUE_USERS and
GROUP_UNIQUE_USERS be finally implemented in a later release, the
implementation should sub class Create_native_func in sql/item_create.cc.
For example, see the class Create_func_concat.

into  weblab.(none):/home/marcsql/TREE/mysql-5.1-merge2

into  bodhi.local:/opt/local/work/mysql-5.1-runtime

into  weblab.(none):/home/marcsql/TREE/mysql-5.0-runtime

into  weblab.(none):/home/marcsql/TREE/mysql-5.0-19194

  limitation)
Bug#24854 (Mixing Searched Case with Simple Case inside Stored Procedure
  crashes Mysqld)

Implemented code review (19194) comments

into  example.com:/work/mysql-5.1-maint

into  neptunus.(none):/home/msvensson/mysql/mysql-5.1-maint

Remove DBUG_ENTER in my_end

uninitialized list of guarded instances.

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into  rolltop.ignatz42.dyndns.org:/mnt/storeage/mysql-5.0-maint

into  rolltop.ignatz42.dyndns.org:/mnt/storeage/mysql-5.1-maint

into  rolltop.ignatz42.dyndns.org:/mnt/storeage/bug20836/my51-bug20836

into  rolltop.ignatz42.dyndns.org:/mnt/storeage/bug20836/my50-bug20836

- Comment Cleanup.

error message in the logs before shutting down the server

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into  kahlann.erinye.com:/home/df/mysql/build/mysql-5.1-build

into  kahlann.erinye.com:/home/df/mysql/build/mysql-5.0-build-work