crashes.

MySQL distributions contain a number of programs that are used only by
the MySQL test suite internally, i.e. they are not indended to be
invoked directly by a user. As a result, such programs are not
documented, do not have any built-in help or proper error reporting,
which may confuse users.

This patch fixes the problem with the following changes:
- mytest, libmysqltest and all references to them were removed from the
distribution since they are not used anymore
- bug25714 now displays an error message when run with incorrect
arguments or with the --help option
- mysql_client_test now does not call abort() in case of errors,
instead it does a clean exit() with a proper error status.

causes out of memory errors

The code in mysql_create_function() and mysql_drop_function() assumed
that the only reason for UDFs being uninitialized at that point is an
out-of-memory error during initialization. However, another possible 
reason for that is the --skip-grant-tables option in which case UDF 
initialization is skipped and UDFs are unavailable.

The solution is to check whether mysqld is running with
--skip-grant-tables and issue a proper error in such a case.

  
Since, as of MySQL 5.0.15, CHAR() arguments larger than 255 are converted into multiple result bytes, a single CHAR() argument can now take up to 4 bytes. This patch fixes Item_func_char::fix_length_and_dec() to take this into account.
  
This patch also fixes a regression introduced by the patch for bug21513. As now we do not always have the 'name' member of Item set for Item_hex_string and Item_bin_string, an own print() method has been added to Item_hex_string so that it could correctly be printed by Item_func::print_args().

updated result files

into  mysql.com:/home/gluh/MySQL/Merge/5.0-opt

issue an error if string has illegal characters

into  gleb.loc:/home/uchum/work/bk/5.0-opt

  Fixed dbug macros usage errors

into  magare.gmz:/home/kgeorge/mysql/autopush/B31156-5.0-opt

into  magare.gmz:/home/kgeorge/mysql/autopush/B31440-5.0-opt

into  gleb.loc:/home/uchum/work/bk/5.0-opt

into  magare.gmz:/home/kgeorge/mysql/autopush/B31440-5.0-opt

into  mysql.com:/home/hf/work/31155/my50-31155

into  gleb.loc:/home/uchum/work/bk/5.0-opt

Bug#30982 CHAR(..USING..) can return a not-well-formed string
Bug#30986 Character set introducer followed by a HEX string can return bad result
check_well_formed_result moved to Item from Item_str_func
fixed Item_func_char::val_str for proper ucs symbols converting
added check for well formed strings for correct conversion of constants with underscore
charset

The special case with NULL as a regular expression
was handled at prepare time. But in this special case
the item was not marked as fixed. This caused an assertion
at execution time.
Fixed my marking the item as fixed even when known to 
return NULL at prepare time.

                  precision > 0 && scale <= precision'.

A sign of a resulting item of the IFNULL function was not
updated and the maximal length of this result was calculated
improperly. Correct algorithm was copy&pasted from the IF
function implementation.

into  mysql.com:/home/gluh/MySQL/Merge/5.0-opt

added variables relay_log, relay_log_index, relay_log_info_file to init_vars[]
to make them visible within SHOW VARIABLES

removed now() call to make the test to be year independent

into  dl145s.mysql.com:/data0/mhansson/bug31160/my50-bug31160

into  dl145s.mysql.com:/data0/mhansson/bug31160/my50-bug31160

Even though it returns NULL, the MAKETIME function did not have this property set,
causing a failed assertion (designed to catch exactly this).
Fixed by setting the nullability property of MAKETIME().

into  linux-st28.site:/home/martin/mysql/src/bug30832-again-push/my50-bug30832-again

Completion of previous patch. Negative number were denied
as the second argument to NAME_CONST.

  Item_sum_distinct::setup(THD*): Assertion

There was an assertion to detect a bug in ROLLUP
implementation. However the assertion is not true
when used in a subquery context with non-cacheable
statements.
Fixed by turning the assertion to accepted case
(just like it's done for the other aggregate functions). 

when a divisor is less than 1 and its fractional part is very long.
For example:
1 % .123456789123456789123456789123456789123456789123456789123456789123456789123456789;

Stack buffer overflow has been fixed in the do_div_mod function.

into  mysql.com:/home/hf/work/30286/my50-30286

into  dl145s.mysql.com:/data0/mhansson/bug30942/my50-bug30942

into  mysql.com:/home/hf/work/30286/my50-30286

into  mysql.com:/home/hf/work/30286/my41-30286

into  mysql.com:/home/hf/work/30286/my50-30286

into  mysql.com:/home/hf/work/30286/my41-30286

into  mysql.com:/home/hf/work/30286/my50-30286

into  mysql.com:/home/hf/work/30286/my50-30286

As the result of DOUBLE claculations can be bigger
than DBL_MAX constant we use in code, we shouldn't use this constatn
as a biggest possible value.
Particularly the rtree_pick_key function set 'min_area= DBL_MAX' relying
that any rtree_area_increase result will be less so we return valid
key. Though in rtree_area_increase function we calculate the area
of the rectangle, so the result can be 'inf' if the rectangle is
huge enough, which is bigger than DBL_MAX.

Code of the rtree_pick_key modified so we always return a valid key.

into  trift2.:/MySQL/M50/push-5.0

added check for hidden I_S tables for 'show columns|keys' commands

into  production.mysql.com:/usersnfs/jperkin/bk/bug-27692/5.0