The cause of the bug was an incomplete fix for bug 18080.
The problem was that setup_tables() unconditionally reset the
name resolution context to its 'tables' argument, which pointed
to the first table of an SQL statement.

The bug fix limits resetting of the name resolution context in
setup_tables() only in the cases when the context was not set
by earlier parser/optimizer phases.

into  dl145s.mysql.com:/data/tkatchaounov/autopush/5.0-bug-21456

into  moonbone.local:/work/tmp_merge-5.0-mysql

into  moonbone.local:/work/tmp_merge-4.1-opt-mysql

into  moonbone.local:/work/tmp_merge-5.0-mysql

into  mysql.com:/home/psergey/mysql-5.0-bug16255-merge

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

const tables. This resulted in choosing extremely inefficient
execution plans in same cases when distribution of data in
joined were skewed (see the customer test case for the bug).

  Corrected fix for bug#18165

  Corrected fix for bug#18165

 Must not use Item_direct_ref in HAVING because it points to
 the new value (witch is not yet calculated for the first row).

  Corrected test case for the bug#21261
sql_parse.cc:
  Corrected fix for bug#21261

into  lamia.home:/home/timka/mysql/src/5.0-bug-21456

GROUP BY/DISTINCT pruning optimization must be done before ORDER BY 
optimization because ORDER BY may be removed when GROUP BY/DISTINCT
sorts as a side effect, e.g. in 
  SELECT DISTINCT <non-key-col>,<pk> FROM t1
  ORDER BY <non-key-col> DISTINCT
must be removed before ORDER BY as if done the other way around
it will remove both.

into  moonbone.local:/work/21475-fix-5.0-opt-mysql

  Additional fix for bug #21475
item_func.h, item_func.cc:
  Additional fix for bug#16861

into  salvation.intern.azundris.com:/home/tnurnberg/work/mysql-5.0-maint-20987

into  salvation.intern.azundris.com:/home/tnurnberg/work/mysql-5.0-maint-20987

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

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

into  sunlight.local:/local_work/16861-bug-5.0-mysql

used.

Sorting by RAND() uses a temporary table in order to get a correct results.
User defined variable was set during filling the temporary table and later
on it is substituted for its value from the temporary table. Due to this
it contains the last value stored in the temporary table.

Now if the result_field is set for the Item_func_set_user_var object it 
updates variable from the result_field value when being sent to a client.

The Item_func_set_user_var::check() now accepts a use_result_field
parameter. Depending on its value the result_field or the args[0] is used
to get current value.

into  moonbone.local:/work/21475-bug-5.0-opt-mysql

into  salvation.intern.azundris.com:/home/tnurnberg/work/mysql-5.0-maint-20411

when X.509 subject was required for a connect, we tested whether it was the right
one, but did not refuse the connexion if not. fixed.

(corrected CS now --replace_results socket-path)

into  salvation.intern.azundris.com:/home/tnurnberg/work/mysql-5.0-maint-20987

buffer for a MY_BITMAP temporary buffer allocated on stack in the
function get_best_covering_ror_intersect().
Now the buffer of a proper size is allocated by a request from this
function in mem_root.

We succeeded to demonstrate the bug only on Windows with a very large
database. That's why no test case is provided for in the patch.

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

Bug #18744 Test 'join_outer' fails if "classic" configuration in 5.0
 - moved an InnoDB dependent test to the appropriate file

into  hasky.mysql.fi:/home/jani/mysql-5.0_bug21537

A date can be represented as an int (like 20060101) and as a string (like
"2006.01.01"). When a DATE/TIME field is compared in one SELECT against both
representations the constant propagation mechanism leads to comparison
of DATE as a string and DATE as an int. In this example it compares 2006 and
20060101 integers. Obviously it fails comparison although they represents the
same date.


Now the Item_bool_func2::fix_length_and_dec() function sets the comparison
context for items being compared. I.e. if items compared as strings the
comparison context is STRING.
The constant propagation mechanism now doesn't mix items used in different
comparison contexts. The context check is done in the
Item_field::equal_fields_propagator() and in the change_cond_ref_to_const() 
functions.

Also the better fix for bug 21159 is introduced.

into  mysql.com:/home/cps/mysql/trees/mysql-5.0-virgin

innodb r719

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