Correct memory leak fix

  When executing ALTER TABLE all the attributes of the view were overwritten.
  This is contrary to the user's expectations.
  So some of the view attributes are preserved now : namely security and 
  algorithm. This means that if they are not specified in ALTER VIEW
  their values are preserved from CREATE VIEW instead of being defaulted.

into  rakia.(none):/home/kgeorge/mysql/autopush/B16712-5.0-opt

  when calculating GROUP_CONCAT all blob fields are transformed
  to varchar when making the temp table.
  However a varchar has at max 2 bytes for length. 
  This fix makes the conversion only for blobs whose max length 
  is below that limit. 
  Otherwise blob field is created by make_string_field() call.

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

subqueries on information schema that use MIN/MAX aggregation.

Execution of some correlated subqueries may set the value
of null_row to 1 for tables used in the subquery.
If the the subquery is on information schema it causes
rejection of any row for the following executions of
the subquery in the case when an optimization filtering
by some condition is applied.

The fix restores the value of the null_row flag for 
each execution of a subquery on information schema.

into  macbook.mshome.net:/Users/kgeorge/mysql/work/B20466-5.0-opt

into  rakia.(none):/home/kgeorge/mysql/autopush/B20868-5.0-opt

into  rakia.(none):/home/kgeorge/mysql/autopush/B20868-5.0-opt

into  mysql.com:/home/psergey/mysql-5.0-opt2

into  rakia.(none):/home/kgeorge/mysql/autopush/B20868-5.0-opt

  Fixed typo.

into  mysql.com:/home/psergey/mysql-5.0-opt2

into  moonbone.local:/work/autopush/12185-bug-5.0-opt-mysql

The Item::tmp_table_field_from_field_type() function creates Field_datetime
object instead of Field_timestamp object for timestamp field thus always
changing data type is a tmp table is used.

The Field_blob object constructor which is used in the 
Item::tmp_table_field_from_field_type() is always setting packlength field of
newly created blob to 4. This leads to changing fields data type for example
from the blob to the longblob if a temporary table is used.

The Item::make_string_field() function always converts Field_string objects 
to Field_varstring objects. This leads to changing data type from the 
char/binary to varchar/varbinary.

Added appropriate Field_timestamp object constructor for using in the 
Item::tmp_table_field_from_field_type() function.

Added Field_blob object constructor which sets pack length according to
max_length argument.

The Item::tmp_table_field_from_field_type() function now creates
Field_timestamp object for a timestamp field.

The Item_type_holder::display_length() now returns correct NULL length NULL
length. 

The Item::make_string_field() function now doesn't change Field_string to
Field_varstring in the case of Item_type_holder. 

The Item::tmp_table_field_from_field_type() function now uses the Field_blob
constructor which sets packlength according to max_length.

into  mysql.com:/home/psergey/mysql-5.0-opt

  When making a place to store field values at the start of each group
  the real item (not the reference) must be used when deciding which column
  to copy.

into  rakia.(none):/home/kgeorge/mysql/autopush/B20868-5.0-opt

 An aggregate function reference was resolved incorrectly and
caused a crash in count_field_types.
 Must use real_item() to get to the real Item instance through
the reference

into  lamia.home:/home/tkatchaounov/autopush/5.0-bug-21007

The problem was that store_top_level_join_columns() incorrectly assumed
that the left/right neighbor of a nested join table reference can be only
at the same level in the join tree.

The fix checks if the current nested join table reference has no immediate
left/right neighbor, and if so chooses the left/right neighbors of the
nearest upper level, where these references are != NULL.

  Add implementations of Item_func_{nop,not}_all::neg_transformer

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

for class Item_func_trim. 
For 4.1 it caused wrong output for EXPLAIN EXTENDED commands
if expressions with the TRIM function of two arguments were used.
For 5.0 it caused an error message when trying to select
from a view with the TRIM function of two arguments.
This unexpected error message was due to the fact that the
print method for the class Item_func_trim was inherited from
the class Item_func. Yet the TRIM function does not take a list
of its arguments. Rather it takes the arguments in the form:
  [{BOTH | LEADING | TRAILING} [remstr] FROM] str) |
  [remstr FROM] str

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

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

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

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

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

  Test case for bug#10977 altered to make it work in both plain and ps-protocol modes.

  Corrected the test case after fixing bug#10977

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

  Fixed bug#10977: No warning issued if a column name is truncated
  New warning message is added.

When an alias is set to a column leading spaces are removed from the alias.
But when this is done on aliases set by user this can lead to confusion.

Now Item::set_name() method issues the warning if leading spaces were removed
from an alias set by user.

New warning message is added.

into  orca.ndb.mysql.com:/space_old/pekka/ndb/version/my50

The bug caused a crash of the server if a subquery with
ORDER BY DESC used the range access method.
The bug happened because the method QUICK_SELECT_DESC::reset
was not reworked after MRR interface had been introduced.