The Item_outer_ref class based on the Item_direct_ref class was always used
to represent an outer field. But if the outer select is a grouping one and the 
outer field isn't under an aggregate function which is aggregated in that
outer select an Item_ref object should be used to represent such a field.
If the outer select in which the outer field is resolved isn't grouping then
the Item_field class should be used to represent such a field.
This logic also should be used for an outer field resolved through its alias
name.

Now the Item_field::fix_outer_field() uses Item_outer_field objects to
represent aliased and non-aliased outer fields for grouping outer selects
only.
Now the fix_inner_refs() function chooses which class to use to access outer
field - the Item_ref or the Item_direct_ref. An object of the chosen class
substitutes the original field in the Item_outer_ref object.
The direct_ref and the found_in_select_list fields were added to the
Item_outer_ref class.

enabled the optional FOR JOIN to all the three
clauses : USE, FORCE and IGNORE

into  magare.gmz:/home/kgeorge/mysql/work/B27164-5.0-opt

 to 0 causes wrong (large) length to be read
 from the row in _mi_calc_blob_length() when 
 storing NULL values in (e.g) POINT columns.
 This large length is then used to allocate
 a block of memory that (on some OSes) causes
 trouble.
 Fixed by calling the base class's 
 Field_blob::reset() from Field_geom::reset()
 that is called when storing a NULL value into
 the column.

into  olga.mysql.com:/home/igor/dev-opt/mysql-5.0-opt-bug27229

from func_group.test after the patch for bug #27229 had been applied.
The memory corruption happened because in some rare cases the function
count_field_types underestimated the number of elements in
in the array param->items_to_copy.

into  magare.gmz:/home/kgeorge/mysql/autopush/B26186-5.0-opt

into  olga.mysql.com:/home/igor/dev-opt/mysql-5.0-opt-bug27229

context was used as an argument of GROUP_CONCAT.
Ensured correct setting of the depended_from field in references
generated for set functions aggregated in outer selects.
A wrong value of this field resulted in wrong maps returned by 
used_tables() for these references.
Made sure that a temporary table field is added for any set function
aggregated in outer context when creation of a temporary table is 
needed to execute the inner subquery. 

into  moonbone.local:/mnt/gentoo64/work/26813-bug-5.0-opt-mysql

  Post-fix for bug#26813.

into  mysql.com:/home/hf/work/mrg/mysql-5.0-opt

into  mysql.com:/home/hf/work/mrg/mysql-5.0-opt

into  mysql.com:/home/hf/work/mrg/mysql-5.0-opt

into  mysql.com:/home/hf/work/mrg/mysql-5.0-opt

into  mysql.com:/home/hf/work/mrg/mysql-4.1-opt

into  moonbone.local:/mnt/gentoo64/work/26813-bug-5.0-opt-mysql

another user.

When the DEFINER clause isn't specified in the ALTER statement then it's loaded
from the view definition. If the definer differs from the current user then
the error is thrown because only a super-user can set other users as a definers.

Now if the DEFINER clause is omitted in the ALTER VIEW statement then the
definer from the original view is used without check.

into  magare.gmz:/home/kgeorge/mysql/autopush/B26186-5.0-opt

into  magare.gmz:/home/kgeorge/mysql/autopush/B26207-5.0-opt

 in index search MySQL was not explicitly
 suppressing warnings. And if the context 
 happens to enable warnings (e.g. INSERT ..
 SELECT) the warnings resulting from converting 
 the data the key is compared to are 
 reported to the client.
 Fixed by suppressing warnings when converting
 the data to the same type as the key parts.

Patch appled after doing a pull from the team tree. Additional tests had to be
fixed

into  linux-st28.site:/home/martin/mysql/src/5.0o-bug24791

into  perch.ndb.mysql.com:/home/jonas/src/mysql-5.0-ndb

into  perch.ndb.mysql.com:/home/jonas/src/mysql-5.0-ndb

  fix test prg

into  linux-st28.site:/home/martin/mysql/src/5.0o-bug24791

The problem in this bug is when we create temporary tables. When
temporary tables are created for unions, there is some 
inferrence being carried out regarding the type of the column.
Whenever this column type is inferred to be REAL (i.e. FLOAT or
DOUBLE), MySQL will always try to maintain exact precision, and
if that is not possible (there are hardware limits, since FLOAT
and DOUBLE are stored as approximate values) will switch to
using approximate values. The problem here is that at this point
the information about number of significant digits is not 
available. Furthermore, the number of significant digits should
be increased for the AVG function, however, this was not properly 
handled. There are 4 parts to the problem:

#1: DOUBLE and FLOAT fields don't display their proper display 
lengths in max_display_length(). This is hard-coded as 53 for 
DOUBLE and 24 for FLOAT. Now changed to instead return the 
field_length.

#2: Type holders for temporary tables do not preserve the 
max_length of the Item's from which they are created, and is 
instead reverted to the 53 and 24 from above. This causes 
*all* fields to get non-fixed significant digits.

#3: AVG function does not update max_length (display length)
when updating number of decimals.

#4: The function that switches to non-fixed number of 
significant digits should use DBL_DIG + 2 or FLT_DIG + 2 as 
cut-off values (Since fixed precision does not use the 'e' 
notation)

Of these points, #1 is the controversial one, but this 
change is preferred and has been cleared with Monty. The 
function causes quite a few unit tests to blow up and they had
to b changed, but each one is annotated and motivated. We 
frequently see the magical 53 and 24 give way to more relevant
numbers.

into  whalegate.ndb.mysql.com:/home/tomas/mysql-5.0-ndb

  fix for cast( AS DATETIME)+0 in 5.0 and above versions.
  val_real now works using val_decimal for DATETIME Items
  Superfluous val_real() methods deleted

into  mysql.com:/home/hf/work/mrg/mysql-5.0-opt

  fix for cast( AS DATETIME) + 0 operation.
  I just implemented Item_datetime_typecast::val() method
  as it is usually done in other classes.
  Should be fixed more radically in 5.0

into  mysql.com:/home/hf/work/mrg/mysql-5.0-opt

into  mysql.com:/home/hf/work/mrg/mysql-5.0-opt

into  mysql.com:/home/hf/work/mrg/mysql-5.0-opt

into  mysql.com:/home/hf/work/mrg/mysql-4.1-opt

into  mysql.com:/home/hf/work/25492/my50-25492

of its argument happened to be a decimal expression returning
the NULL value.
The crash was due to the fact the function in_decimal::set did
not take into account that val_decimal() could return 0 if 
the decimal expression had been evaluated to NULL.  

into  whalegate.ndb.mysql.com:/home/tomas/mysql-5.0-ndb

into  quadxeon.mysql.com:/benchmarks/ext3/TOSAVE/tsmith/bk/maint/50