doesn't recognize it
  
This is a 5.1 version of the patch.
  
Problem:
  
'log' and 'log_slow_queries' were "fixed" variables, i.e. they showed up
in SHOW VARIABLES, but could not be used in expressions like 
"select @@log". Also, using them in the SET statement produced an 
incorrect "unknown system variable" error.
  
Solution:

Since as of MySQL 5.1.12 one can enable or disable the general query log
or the slow query log at runtime by changing values of
general_log/slow_query_log, make 'log' and 'log_slow_queries" to be 
synonyms for 'general_log' and 'slow_query_log' respectively.  This 
makes expressions using the '@@var' syntax backward compatible with 
5.0 and SHOW VARIABLES output to be consistent with the SET statement.


mysql-test/r/log_state.result:
  Added a test case for bug #29131.
mysql-test/t/log_state.test:
  Added a test case for bug #29131.
sql/set_var.cc:
  Made the 'log' and 'log_slow_queries' system variables to be synonyms for 'general_log' and 'slow_query_log'.

into  polly.(none):/home/kaa/src/opt/bug28550/my51-bug28550


mysql-test/t/func_str.test:
  Auto merged
sql/item.cc:
  Auto merged
sql/item.h:
  Auto merged
sql/item_strfunc.h:
  Auto merged
mysql-test/r/func_str.result:
  Manual merge.

  
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().


mysql-test/r/func_str.result:
  Import patch bug288550.patch
mysql-test/t/func_str.test:
  Import patch bug288550.patch
sql/item.cc:
  Import patch bug288550.patch
sql/item.h:
  Import patch bug288550.patch
sql/item_strfunc.h:
  Import patch bug288550.patch

move 'table_collation' field filling outside of if(file) condition
because this field has 'OPEN_FRM_ONLY' attribute


mysql-test/r/information_schema.result:
  test result
mysql-test/t/information_schema.test:
  test case
sql/sql_show.cc:
  move 'table_collation' field filling outside of if(file) condition
  because this field has 'OPEN_FRM_ONLY' attribute

into  mysql.com:/home/gluh/MySQL/Merge/5.1-opt


mysql-test/suite/funcs_1/r/innodb__datadict.result:
  manual merge
mysql-test/suite/funcs_1/r/myisam__datadict.result:
  manual merge

updated result files


mysql-test/suite/funcs_1/r/innodb__datadict.result:
  updated result file
mysql-test/suite/funcs_1/r/memory__datadict.result:
  updated result file
mysql-test/suite/funcs_1/r/myisam__datadict.result:
  updated result file

into  mysql.com:/home/gluh/MySQL/Merge/5.1-opt


mysql-test/r/ctype_utf8.result:
  Auto merged
mysql-test/t/ctype_utf8.test:
  Auto merged
sql/item.cc:
  Auto merged
sql/item.h:
  Auto merged
sql/sql_yacc.yy:
  Auto merged

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


sql/item.cc:
  Auto merged
sql/item.h:
  manual merge

issue an error if string has illegal characters


mysql-test/r/ctype_utf8.result:
  issue an error if string has illegal characters
mysql-test/t/ctype_utf8.test:
  issue an error if string has illegal characters
sql/item.cc:
  issue an error if string has illegal characters
sql/item.h:
  issue an error if string has illegal characters
sql/sql_yacc.yy:
  issue an error if string has illegal characters

into  gleb.loc:/home/uchum/work/bk/5.1-opt


mysql-test/r/type_decimal.result:
  Auto merged
strings/decimal.c:
  Auto merged

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

into  magare.gmz:/home/kgeorge/mysql/autopush/B31156-5.1-opt


sql/item_sum.cc:
  Auto merged

  Fixed dbug macros usage errors


sql/item_sum.cc:
  Fixed dbug macros usage errors

into  magare.gmz:/home/kgeorge/mysql/work/B31156-5.1-opt


mysql-test/r/func_group.result:
  Auto merged
mysql-test/t/func_group.test:
  Auto merged
sql/item_cmpfunc.cc:
  Auto merged
sql/item_sum.cc:
  Auto merged

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

into  magare.gmz:/home/kgeorge/mysql/autopush/B31440-5.1-opt


sql/item_cmpfunc.cc:
  Auto merged

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


sql/item_cmpfunc.cc:
  Auto merged

into  gleb.loc:/home/uchum/work/bk/5.1-opt

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

into  magare.gmz:/home/kgeorge/mysql/work/B31440-5.1-opt


mysql-test/r/func_regexp.result:
  Auto merged
sql/item_cmpfunc.cc:
  Auto merged

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

into  mysql.com:/home/hf/work/31155/my51-31155


sql/item.cc:
  Auto merged
sql/item.h:
  Auto merged

into  mysql.com:/home/hf/work/31155/my51-31155


sql/item.cc:
  Auto merged
sql/item.h:
  merging

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


sql/item.cc:
  Auto merged

into  mysql.com:/home/hf/work/31155/my51-31155


sql/item.h:
  Auto merged
sql/item_geofunc.h:
  Auto merged
sql/item.cc:
  merging
sql/item_geofunc.cc:
  merging

into  gleb.loc:/home/uchum/work/bk/5.1-opt


mysql-test/r/create.result:
  Auto merged
mysql-test/r/null.result:
  Auto merged
sql/item_cmpfunc.cc:
  Auto merged

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

into  mysql.com:/home/gluh/MySQL/Merge/5.1-opt


mysql-test/r/ctype_ucs.result:
  Auto merged
mysql-test/r/ctype_utf8.result:
  Auto merged
mysql-test/t/ctype_ucs.test:
  Auto merged
mysql-test/t/ctype_utf8.test:
  Auto merged
sql/item.cc:
  Auto merged
sql/item.h:
  Auto merged
sql/item_strfunc.cc:
  Auto merged
sql/item_strfunc.h:
  Auto merged
sql/sql_yacc.yy:
  manual merge

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


mysql-test/r/ctype_ucs.result:
  test result
mysql-test/r/ctype_utf8.result:
  test result
mysql-test/t/ctype_ucs.test:
  test case
mysql-test/t/ctype_utf8.test:
  test case
sql/item.cc:
  check_well_formed_result() moved from Item_str_func
sql/item.h:
  check_well_formed_result() moved from Item_str_func
sql/item_strfunc.cc:
  check_well_formed_result moved to Item
  fixed Item_func_char::val_str for proper ucs symbols converting
sql/item_strfunc.h:
  check_well_formed_result moved to Item
sql/sql_yacc.yy:
  added check for well formed string

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.


mysql-test/r/func_regexp.result:
  Bug #31440: test case
mysql-test/t/func_regexp.test:
  Bug #31440: test case
sql/item_cmpfunc.cc:
  Bug #31440: mark the item as fixed even when 
  known to return NULL.

                  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.


sql/item_cmpfunc.cc:
  Fixed bug #31471.
  The Item_func_ifnull::fix_length_and_dec method has been
  modified to update the Item_func_ifnull::unsigned_flag field
  and to take this field into account when calculating the
  Item_func_ifnull::max_length value.
  (See Item_func_if::fix_length_and_dec for reference).
mysql-test/t/null.test:
  Added test case for bug #31471.
mysql-test/r/null.result:
  Added test case for bug #31471.
mysql-test/r/create.result:
  Update test case after the bugfix of bug #31471.

into  mysql.com:/home/gluh/MySQL/Merge/5.1-opt


libmysql/libmysql.c:
  Auto merged

into  mysql.com:/home/gluh/MySQL/Merge/5.1-opt


libmysql/libmysql.c:
  Auto merged
mysql-test/include/mix1.inc:
  Auto merged
mysql-test/r/innodb_mysql.result:
  Auto merged
sql/field.cc:
  Auto merged
sql/ha_partition.cc:
  Auto merged
sql/sql_base.cc:
  Auto merged
sql/sql_select.cc:
  Auto merged

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


libmysql/libmysql.c:
  Auto merged

into  mysql.com:/home/gluh/MySQL/Merge/5.1-opt


sql/item_timefunc.h:
  Auto merged
mysql-test/suite/rpl/r/rpl_flushlog_loop.result:
  Auto merged
sql/set_var.cc:
  manual merge.
mysql-test/r/view.result:
  manual merge
mysql-test/suite/rpl/t/rpl_flushlog_loop.test:
  manual merge
mysql-test/t/view.test:
  manual merge

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


mysql-test/r/rpl_flush_log_loop.result:
  test result
mysql-test/t/rpl_flush_log_loop.test:
  test case
sql/set_var.cc:
  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


mysql-test/r/view.result:
  result fix
mysql-test/t/view.test:
  removed now() call to make the test to be year independent

into  dl145s.mysql.com:/data0/mhansson/bug31160/my51-bug31160


sql/item_timefunc.h:
  Auto merged