(IN() remove NULL rows only for tables from first argument (value which we looking for in IN() list) but not for tables from IN() list)
Also it will be better change Item::not_null_tables() to prohibit this optimisation by default for new created items in 5.0 or 5.1.

into rurik.mysql.com:/home/igor/mysql-4.1

This fixed a failure of insert_update.test on some platforms

into rurik.mysql.com:/home/igor/dev/mysql-4.1-0

into rurik.mysql.com:/home/igor/mysql-4.1

  Added a test case for bug #11414.
sql_select.cc:
  Fixed bug #11414: crash on Windows with some simple
  GROUP BY queries.
  It happened to an allocation of an array containing
  0 Copy_field elements in setup_copy_fields.
  The bug had been already fixed in 5.0.

  Fixing tests accordingly.
ctype-ucs2.c:
  The same fix for UCS2.
ctype-utf8.c:
  Bug #9557
  MyISAM utf8 table crash
  The problem was that my_strnncollsp_xxx could
  return big value in the range 0..0xffff.
  for some constant pairs it could return 32738,
  which is defined as MI_FOUND_WRONG_KEY in
  myisamdef.h. As a result, table considered to
  be crashed. 
  Fix to return -1,0 or 1.

  Bug#9873, reenabled --without-man option to work

  Enable build with CXX=gcc and gcc version 4

  Corrected quoting of string "pro-nt"

  Added missing `;' to DBUG_RETURN()

into mysql.com:/my/mysql-4.1

Fixes while reviewing new pushed code
NULL as argument to encrypt/decrypt should return NULL without a warning

into mysql.com:/my/mysql-4.1

into  mishka.local:/home/my/mysql-4.1

#9728  'Decreased functionality in "on duplicate key update
#8147  'a column proclaimed ambigous in INSERT ... SELECT .. ON DUPLICATE'

This ensures fields are uniquely qualified and also that one can't update other tables in the ON DUPLICATE KEY UPDATE part

into neptunus.(none):/home/msvensson/mysql/mysql-4.1

into rurik.mysql.com:/home/igor/mysql-4.1

Moved the key statistics update to info().
The table is not locked in open(). This made wrong stats possible.

No test case for the test suite.
This happens only with heavy concurrency.
A test script is added to the bug report.

into mysql.com:/home/timka/mysql/src/4.1-virgin

into rurik.mysql.com:/home/igor/mysql-4.1

into neptunus.(none):/home/msvensson/mysql/mysql-4.1

into mysql.com:/home/timka/mysql/src/4.1-virgin

into mysql.com:/Users/kent/mysql/bk/mysql-4.1

into rurik.mysql.com:/home/igor/dev/mysql-4.1-1

into mysql.com:/home/psergey/mysql-4.1-bug10151

  Fix for fix for bug #9728
  Error caused server hang on prepared insert ... select

  Might need a restart after test with special TZ
  Removed unused argument to run_mysqltest()

into mysql.com:/home/psergey/mysql-4.1-bug10151

into rurik.mysql.com:/home/igor/dev/mysql-4.1-1

  Added a test case for bug #10124.
sql_select.h, item_subselect.cc, sql_select.cc:
  Fixed bug #10124.
  The copy method of the store_key classes can return
  STORE_KEY_OK=0, STORE_KEY_FATAL=1, STORE_KEY_CONV=2 now.
field.cc:
  Fixed bug #10124.
  When ussuing a warning the store methods return 2 instead of 1 now.

into neptunus.(none):/home/msvensson/mysql/mysql-4.1

into  mishka.local:/home/my/mysql-4.1

into mysql.com:/home/timka/mysql/src/4.1-virgin

into mysql.com:/space/my/mysql-4.1