The problem in 4.1 was the same as in 4.0 - fix_fields() not called for created Item_ref. 
The fix is similar too - initialize Item_refs in ctor (but don't interfere with cases when 
Item_ref is used by subselects). 

into pcgem.rdg.cyberkinetica.com:/usr/home/acurtis/work/wl2274.2

into poseidon.ndb.mysql.com:/home/tomas/mysql-4.1-clean

  quick fix for wrong allocation of size

into sanja.is.com.ua:/home/bell/mysql/bk/mysql-4.1

into poseidon.ndb.mysql.com:/home/tomas/mysql-4.1-clean

changed back to just restricting max meta objects in dict to make sure we can "always" configure ourselves out of unforseen limits

into sanja.is.com.ua:/home/bell/mysql/bk/work-ref-4.1

  UPDATE clause conflicts with SELECT for use of item_list field.
  Alter UPDATE clause to use new lex field update_list
  Tests included

+ fixed testcase

into poseidon.ndb.mysql.com:/home/tomas/mysql-4.1-clean

  changed help text

    added start backup parameter to enable setting wait state
    and set different timeouts depending on waitstate
    moved listen of backup event out of backup and into separete thread
    thread created at connect() and destroyed at disconnect()
    added start backup command options "nowait" "wait completed" "wait started"
    fixed log level settings

into sanja.is.com.ua:/home/bell/mysql/bk/work-ref-4.1

into mysql.com:/dbdata/psergey/mysql-4.0-bug6976

In Item_ref::Item_ref set maybe_null (and other fields fix_fields sets) to be the 
same as in (*ref), because Item_ref::fix_fields() will not be called.  Previously 
maybe_null was 0 always and this produced a bogus state where 
maybe_null==0 && is_null() == true 
which broke evaluation for some upper-level Items, like AND and OR.

refernces if subqueri is not in HAVING clause (BUG#7079)
  and the same used for subquery transformetion

  Call mark_as_null_row in join_read_const and join_read_system.

into poseidon.ndb.mysql.com:/home/tomas/mysql-4.1-clean

into serg.mylan:/usr/home/serg/Abk/mysql-4.1

into hundin.mysql.fi:/home/marko/k/mysql-4.1

into hundin.mysql.fi:/home/marko/k/mysql-4.0

into gw.mysql.r18.ru:/usr/home/ram/work/4.1

  Remove accidentally pushed unnecessary change

       bug #7126: Test failure: 'func_str' when using '--ps-protocol'
       bug #7130: Test failure: 'type_uint' when using '--ps-protocol').

  Remove accidentally merged 4.0 changes
dict0dict.c:
  Remove the 4.0 fix accidentally auto-merged to 4.1
row0mysql.h, dict0dict.h:
  Remove a change auto-merged from 4.0