The 'decimals' member of Item_func was being improperly initialized,
  which resulted in improper results when handling large numeric values.

into moonbone.local:/work/19077-bug-5.0-mysql

The convert_constant_item() function converts constant items to ints on
prepare phase to optimize execution speed. In this case it tries to evaluate
subselect which contains a derived table and is contained in a derived table. 
All derived tables are filled only after all derived tables are prepared.
So evaluation of subselect with derived table at the prepare phase will
return a wrong result.

A new flag with_subselect is added to the Item class. It indicates that
expression which this item represents is a subselect or contains a subselect.
It is set to 0 by default. It is set to 1 in the Item_subselect constructor
for subselects.
For Item_func and Item_cond derived classes it is set after fixing any argument
in Item_func::fix_fields() and Item_cond::fix_fields accordingly.
The convert_constant_item() function now doesn't convert a constant item
if the with_subselect flag set in it. 

Fixes bug#19040 "yaSSL does not compile on AIX".

into  neptunus.(none):/home/msvensson/mysql/bug18818/my50-bug18818

into  poseidon.ndb.mysql.com:/home/tomas/mysql-5.0-main

into  poseidon.ndb.mysql.com:/home/tomas/mysql-5.0-main

into  poseidon.ndb.mysql.com:/home/tomas/mysql-5.0

    ndb: ndb_waiter disconnect/reconnect on get status error

into  production.mysql.com:/usersnfs/tulin/mysql-5.0

into  mysql.com:/usr_rh9/home/elkin.rh9/MySQL/Merge/5.0

into  mysql.com:/opt/local/work/mysql-5.0-runtime-merge

fixing encoding example because of table names can not be in koi8r 
on some platforms.

into mysql.com:/home/psergey/mysql-5.0-bug19618

into  poseidon.ndb.mysql.com:/home/tomas/mysql-5.0-main

into  mysql.com:/opt/local/work/mysql-5.0-runtime-merge

into  poseidon.ndb.mysql.com:/home/tomas/mysql-5.0

- not having lock can cause "block number list" to become corrupt => crash
- also may result in 2 threads receiving same block no => possble cause of
Bug #13987 Cluster: Loss of data nodes can cause high CPU usage from ndb_mgmd

into mysql.com:/home/psergey/mysql-5.0-bug19618

into  poseidon.ndb.mysql.com:/home/tomas/mysql-4.1

into  poseidon.ndb.mysql.com:/home/tomas/mysql-5.0

into  mysql.com:/data0/knielsen/tmp-5.0

into  mysql.com:/opt/local/work/mysql-5.0-runtime-merge

into  mysql.com:/data0/knielsen/tmp-5.0

into  mysql.com:/users/lthalmann/bk/mysql-5.0-rpl

into  mysql.com:/usr/local/mysql/tmp-5.0

into  dl145j.mysql.com:/tmp/andrei/5.0

into  mysql.com:/usr/local/mysql/tmp-5.0

into  mysql.com:/usr/local/mysql/tmp-5.0

into  mysql.com:/home/alexi/innodb/mysql-5.0-ss547

into  mysql.com:/home/alexi/innodb/mysql-4.1-ss29

into  poseidon.ndb.mysql.com:/home/tomas/mysql-5.0