After the patch for big 21698 equality propagation stopped
working for BETWEEN and IN predicates with STRING arguments.
This changeset completes the solution of the above patch.

into  rurik.mysql.com:/home/igor/dev-opt/mysql-5.0-opt-bug21646

into  rurik.mysql.com:/home/igor/mysql-5.0-opt

Presence of a subquery in the ON expression of a join 
should not block merging the view that contains this join.
Before this patch the such views were converted into 
into temporary table views.

an ALL/ANY quantified subquery in HAVING.
The Item::split_sum_func2 method should not create Item_ref
for objects of any class derived from Item_subselect.

into  rurik.mysql.com:/home/igor/mysql-5.0-opt

Any default value for a enum fields over UCS2 charsets was corrupted
when we put it into the frm file, as it had been overwritten by its
HEX representation.
To fix it now we save a copy of structure that represents the enum
type and when putting the default values we use this copy. 

into  rurik.mysql.com:/home/igor/mysql-5.0-opt

that returns the results of aggregation by GROUP_CONCAT.
The crash was due to an overflow happened for the field
sortoder->length.
The fix prevents this overflow exploiting the fact that the
value of sortoder->length cannot be greater than the value of
thd->variables.max_sort_length.   

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into  rurik.mysql.com:/home/igor/mysql-4.1-opt

into  dl145s.mysql.com:/data/bk/team_tree_merge/MERGE/mysql-5.0-opt

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into  dl145s.mysql.com:/data/bk/team_tree_merge/MERGE/mysql-4.1-opt

statement that uses an aggregating IN subquery with 
HAVING clause.
A wrong order of the call of split_sum_func2 for the HAVING
clause of the subquery and the transformation for the 
subquery resulted in the creation of a andor structure
that could not be restored at an execution of the prepared
statement.

containing a select statement that uses an aggregating IN subquery.
Added a parameter to the function fix_prepare_information 
to restore correctly the having clause for the second execution.
Saved andor structure of the having conditions at the proper moment
before any calls of split_sum_func2 that could modify the having structure
adding new Item_ref objects. (These additions, are produced not with 
the statement mem_root, but rather with the execution mem_root.)

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into  mysql.com:/home/hartmut/projects/mysql/dev/teamtrees/mysql-5.0-maint

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into  shellback.(none):/home/msvensson/mysql/mysql-5.0-maint

into  zippy.cornsilk.net:/home/cmiller/work/mysql/mysql-5.0-maint