When the Item_cond::fix_fields() function reduces cond tree, it in loop
scans it's own list and when it founds Item_cond with same function (AND
or OR) it does next things: 1) replaces that item with item's list. 2)
empties item's list. Due to this operation is done twice - for update and
for view, at the update phase cond's list of lower view is already empty.
Empty list returns ref to itself, thus making endless loop by replacing
list with itself, emptying, replacing again and so on. This results in
server hung up.

To the Item_cond::fix_fields() function added check that ensures that
list being replaced with isn't empty.


mysql-test/t/view.test:
  Added test for bug#17726: Not checked empty list caused endless loop
mysql-test/r/view.result:
  Added test for bug#17726: Not checked empty list caused endless loop
sql/item_cmpfunc.cc:
  Fixed bug#17726: Not checked empty list caused endless loop
  To the Item_cond::fix_fields() function added check that ensures that
  list being replaced with isn't empty.

into mysql.com:/M50/mysql-5.0

mysql-test/mysql-test-run.sh:
  Auto merged
scripts/make_binary_distribution.sh:
  Auto merged

database
 - Fix test case for systems with "lowercase names"


mysql-test/r/grant2.result:
  Fix for system with "lowercase names", allow error 1007 to be returned
mysql-test/t/grant2.test:
  Fix for system with "lowercase names", allow error 1007 to be returned

scripts/make_binary_distribution.sh:
  Auto merged

into mysql.com:/M50/mysql-5.0


mysql-test/mysql-test-run.sh:
  Auto merged

into mysql.com:/home/hf/work/mysql-5.0.9088

into mysql.com:/home/hf/work/mysql-5.0.9088

into  snake-hub.snake.net:/src/extern/MySQL/bk/mysql-4.1-r1.2478


mysql-test/README:
  SCCS merged

into  snake-hub.snake.net:/src/extern/MySQL/bk/mysql-4.0-r1.2173

into  snake-hub.snake.net:/src/extern/MySQL/bk/mysql-5.0

into  snake-hub.snake.net:/src/extern/MySQL/bk/mysql-4.1-r1.2478


mysql-test/README:
  Auto merged

  revise README.


mysql-test/README:
  revise README.

into  snake-hub.snake.net:/src/extern/MySQL/bk/mysql-5.0

into  snake-hub.snake.net:/src/extern/MySQL/bk/mysql-4.1-r1.2478

  Revise README.gcov.


mysql-test/README.gcov:
  Revise README.gcov.

into  snake-hub.snake.net:/src/extern/MySQL/bk/mysql-5.0

into  snake-hub.snake.net:/src/extern/MySQL/bk/mysql-4.1-r1.2478


mysql-test/README:
  Auto merged

into  snake-hub.snake.net:/src/extern/MySQL/bk/mysql-4.1


mysql-test/README:
  Auto merged

  Revise mysql-test README.


mysql-test/README:
  Revise mysql-test README.

into mysql.com:/M40/comment-4.0

into mysql.com:/M41/comment-4.1


mysql-test/mysql-test-run.sh:
  Auto merged

into  lsmy3.wdf.sap.corp:/data/users/tkatchaounov/mysql/src/5.0-bug-17523

into  shellback.(none):/home/msvensson/mysql/mysql-5.0

into  lsmy3.wdf.sap.corp:/data/users/tkatchaounov/mysql/src/5.0-dbg

into mysql.com:/M50/mysql-5.0

into  snake-hub.snake.net:/src/extern/MySQL/bk/mysql-5.0

into  mysql.com:/home/timka/mysql/src/5.0-bug-17523

into  mysql.com:/home/alexi/bugs/mysql-5.0-merged


sql/sql_db.cc:
  Merge

 - Change to use non blocking read to empty channel in case of too large sd number
 - Don't check for too large socket number on Windows.


sql/net_serv.cc:
  Windows does not need protection from sd >= FD_SETSIZE, it uses an array to store the sd's it should read from.
  Change the handler for when "net_data_is_ready" returns -1 to perform nonblocking read to empty the net.
  Only include that handler if HAVE_POLL is not defined  and not windows

  Allocating/freeing memory for the db member of THD
  is wholy managed by slave thread.

to both the Shell and the Perl vaerion of "mysql-test-run"-


mysql-test/mysql-test-run.pl:
  Manual merge.
mysql-test/mysql-test-run.sh:
  Manual merge

mysql-test/mysql-test-run.pl:
  Add a "--comment=<string>" option (backport from 5.1).
  Its sole purpose is to get logged, so that test evaluation gets easier.
  See "Do-compile" for how it is called, and "gen-build-status-page" for its effect.

mysql-test/mysql-test-run.sh:
  Auto merged

mysql-test/r/bigint.result:
  test result
mysql-test/t/bigint.test:
  testcase
sql/item.h:
  unsigned_arg is a separate parameter now
sql/item_cmpfunc.cc:
  we can get unsigned field from the signed Item - from string
  like '1234'

mysql-test/mysql-test-run.sh  :  Add a "--comment=<string>" option, to get it logged when the test is run.


mysql-test/mysql-test-run.sh:
  Add a "--comment=<string>" option, to get it logged when the test is run.
  The purpose is to allow a better analysis when generating the status page 
  ("gen-build-status-page").
  See "Do-compile" for how it is used.