added check for the result of mysql_unpack_partition()

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

Comparison of a BIGINT NOT NULL column with a constant arithmetic
expression that evaluates to NULL caused error 1048: "Column '...'
cannot be null".

Made convert_constant_item() check if the constant expression is NULL
before attempting to store it in a field. Attempts to store NULL in a
NOT NULL field caused query errors.

into  mysql.com:/home/hf/work/31158/my51-31158

into  mysql.com:/home/hf/work/31158/my50-31158

into  mysql.com:/home/hf/work/31158/my41-31158

into  mysql.com:/home/hf/work/31158/my50-31158

into  mysql.com:/home/hf/work/31158/my51-31158

into  mysql.com:/home/hf/work/31158/my51-31158

into  mysql.com:/home/hf/work/31158/my50-31158

into  polly.(none):/home/kaa/src/opt/mysql-5.1-opt

into  polly.(none):/home/kaa/src/opt/mysql-5.1-opt

into  polly.(none):/home/kaa/src/opt/mysql-5.0-opt

into  polly.(none):/home/kaa/src/opt/bug32241/my51-bug29131

checked for each record'

The problem was in incorrectly calculated length of the buffer used to
store a hexadecimal representation of an index map in
select_describe(). This could result in buffer overrun and stack
corruption under some circumstances.

Fixed by correcting the calculation.

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

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

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

Implement neccessary shared lock structure for table locks.
This is the backport of bug26241 fix.

into  magare.gmz:/home/kgeorge/mysql/autopush/B31928-5.1-opt

into  magare.gmz:/home/kgeorge/mysql/autopush/B31928-5.0-opt

into  mysql.com:/misc/mysql/31700/51-31700

tests adjusted for Windows

into  magare.gmz:/home/kgeorge/mysql/work/B31928-5.1-opt

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

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

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

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

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

into  mysql.com:/home/gluh/MySQL/Merge/4.1-opt

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

into  magare.gmz:/home/kgeorge/mysql/autopush/B31562-5.1-opt

storage engine system variables was not validated and
unexpected value was assigned.

The check_func_enum function used subtraction from the uint
value with the probably negative result. That result of
type uint was compared with 0 after casting to signed long
type. On architectures where long type is longer than int
type the result of comparison was unexpected.

into  mysql.com:/home/hf/work/31305/my51-31305

into  mysql.com:/home/hf/work/31305/my50-31305