The RAND(N) function where the N is a field of "constant" table
(table of single row) failed with a SIGFPE.

Evaluation of RAND(N) rely on constant status of its argument.
Current server "seeded" random value for each constant argument
only once, in the Item_func_rand::fix_fields method.
Then the server skipped a call to seed_random() in the
Item_func_rand::val_real method for such constant arguments.

However, non-constant state of an argument may be changed
after the call to fix_fields, if an argument is a field of
"constant" table. Thus, pre-initialization of random value
in the fix_fields method is too early.


Initialization of random value by seed_random() has been
removed from Item_func_rand::fix_fields method.
The Item_func_rand::val_real method has been modified to
call seed_random() on the first evaluation of this method
if an argument is a function.


mysql-test/r/func_math.result:
  Added test case for bug #44768.
mysql-test/t/func_math.test:
  Added test case for bug #44768.
sql/item_func.cc:
  Bug #44768: SIGFPE crash when selecting rand from a view containing null
  
  1. Initialization of random value by seed_random() has been
     removed from Item_func_rand::fix_fields method.
  2. The Item_func_rand::val_real method has been modified to
     call seed_random() on the first evaluation of this method
     if an argument is a function.
sql/item_func.h:
  Bug #44768: SIGFPE crash when selecting rand from a view containing null
  
  1. The Item_func_rand::first_eval has been added to trace
     the first evaluation of the val_real method.
  2. The Item_func_rand::cleanup method has been added to
     cleanup the first_eval flag.

Fix bug in mtr_cases.pm script visible only when InnoDB isn't configured.

mysql-test/lib/mtr_cases.pm:
  If InnoDB isn't configured the help texts won't show the "innodb" option and mysqld_variables will not contain any "innodb" entry.

Occasionally, if both the partition_pruning
and partition_range tests are run sequentially
against the IBMDB2I engine, the partition_range
test will fail.

Compiler padding on a 64-bit build allowed
garbage data in the hash key used for
caching open iconv descriptors. As a
result, cached descriptors were not found,
and multiple duplicate iconv descriptors
were opened for a single character set.
Eventually, the maximum number of open
iconv descriptors was reached, and further
iconv_open() calls would fail, leading the
storage engine to report incorrectly that
the character set was not supported.

This patch widens the 16-bit members of the
hash key to 32 bits to eliminate compiler
padding. The entire length of the hash key
is now initialized correctly on both 32-bit
and 64-bit builds.

storage/ibmdb2i/db2i_charsetSupport.cc:
  Bug#44856 IBMDB2I gives misleading 2504 error
  
  widen the 16-bit members of the
  hash key to 32 bits to eliminate
  compiler padding.

In order to better support the usage of
IBMDB2I tables from within RPG programs,
the storage engine should ensure that the
RCDFMT name is consistent and predictable
for DB2 tables.

This patch appends a "RCDFMT <name>"
clause to the CREATE TABLE statement
that is passed to DB2.  <name> is
generated from the original name of
the table itself. This ensures a
consistent and deterministic mapping
from the original table.

For the sake of simplicity only
the alpha-numeric characters are
preserved when generating the new
name, and these are upper-cased;
other characters are replaced with
an underscore (_). Following DB2
system identifier rules, the name
always begins with an alpha-character
and has a maximum of ten characters.
If no usable characters are found in
the table name, the name X is used.

mysql-test/suite/ibmdb2i/r/ibmdb2i_bug_44610.result:
  Bug#44610 RCDFMT clause requested when creating DB2 table
  
  Result file for the test case.
mysql-test/suite/ibmdb2i/t/ibmdb2i_bug_44610.test:
  Bug#44610 RCDFMT clause requested when creating DB2 table
  
  Test case that confirms that the names that are being generated are valid.
storage/ibmdb2i/ha_ibmdb2i.cc:
  Bug#44610 RCDFMT clause requested when creating DB2 table
  
  This patch appends a "RCDFMT <name>"
  clause to the CREATE TABLE statement
  that is passed to DB2.  <name> is
  generated from the original name of
  the table itself. This ensures a
  consistent and deterministic mapping
  from the original table.
storage/ibmdb2i/ha_ibmdb2i.h:
  Bug#44610 RCDFMT clause requested when creating DB2 table
  
  This patch appends a "RCDFMT <name>"
  clause to the CREATE TABLE statement
  that is passed to DB2.  <name> is
  generated from the original name of
  the table itself. This ensures a
  consistent and deterministic mapping
  from the original table.

  It turns out that this test case no longer fails with the discrepancy
  in numbers that was the original cause for disabling this test (and showed
  potential genuine issues with the query cache). Therefore
  this test is being enabled after some minor adjustment of error codes and
  messages.

Details:
1. Add missing "disconnect <session>"
2. Take care that the disconnects are finished when the test terminates
3. Replace error names by error numbers
4. Minor beautifying of script code

 
Field_time::get_time() did not initialize some members of 
MYSQL_TIME which led to valgrind warnings when those members 
were accessed in Protocol_simple::store_time(). 
 
It is unlikely that this bug could result in wrong data 
being returned, since Field_time::get_time() initializes the 
'day' member of MYSQL_TIME to 0, so the value of 'day' 
in Protocol_simple::store_time() would be 0 regardless 
of the values for 'year' and 'month'.

mysql-test/r/type_time.result:
  Added a test case for bug #44792.
mysql-test/t/type_time.test:
  Added a test case for bug #44792.
sql/field.cc:
  Field_time::get_time() did not initialize some members of 
  MYSQL_TIME which led to valgrind warnings when those members 
  were accessed in Protocol_simple::store_time().

Remove a cast (which shouldn't have got here anyway)
which might lose significant bits beyond 4 GB RAM.


mysys/safemalloc.c:
  Vlad's comment to the cast:
    pointless cast from size_t to uint that loses
    significant bits, when safe_malloc allocates more than 4GB Ram.
    safemalloc is not used in release binaries,
    so it is not absolutely critical.
  
  It got into the sources by a wrong merge resolution.

In UNION if we use last SELECT without braces and this
SELECT have ORDER BY clause, such clause belongs to
global UNION. It is parsed like last SELECT
part and used further as 'unit->global_parameters->order_list' value.
During DESCRIBE EXTENDED we call select_lex->print_order() for
last SELECT where order fields refer to tmp table 
which already freed. It leads to crash.
The fix is clean up global_parameters->order_list
instead of fake_select_lex->order_list.


mysql-test/r/union.result:
  test result
mysql-test/t/union.test:
  test case
sql/sql_union.cc:
  In UNION if we use last SELECT without braces and this
  SELECT have ORDER BY clause, such clause belongs to
  global UNION. It is parsed like last SELECT
  part and used further as 'unit->global_parameters->order_list' value.
  During DESCRIBE EXTENDED we call select_lex->print_order() for
  last SELECT where order fields refer to tmp table 
  which already freed. It leads to crash.
  The fix is clean up global_parameters->order_list
  instead of fake_select_lex->order_list.

  UNIX sockets need to be on a path shorter than 70 characters on some older platofrms.
  MTRv1 tries to fix this by moving the socket to the $TMPDIR, however this causes
  issues with certain tests on Windows.

  Fixed by not applying any hacks on Windows - Windows does not need them.

It is not possible to prevent the server from starting if a mandatory
built-in plugin fails to start. This can in some cases lead to data
corruption when the old table name space suddenly is used by a different
storage engine.

A boolean command line option in the form of --foobar is automatically
created for every existing plugin "foobar". By changing this command line
option from a boolean to a tristate { OFF, ON, FORCE } it is possible to
specify the plugin loading policy for each plugin.

The behavior is specified as follows:
   OFF   = Disable the plugin and start the server
   ON    = Enable the plugin and start the server even if an error occurrs
           during plugin initialization.
   FORCE = Enable the plugin but don't start the server if an error occurrs
           during plugin initialization.


mysql-test/lib/mtr_cases.pm:
  * Changed --<pluginname> from a boolean to a tristate.
mysys/my_getopt.c:
  * Changed --<pluginname> from boolean to tristate. Optional arguments
    must still work for tristates. It is praxis that disable means value 0
    and enable is value 1. Since plugin name is the only tristate with
    optional arguments this principle will still hold.
sql/sql_plugin.cc:
  * Changed --<pluginname> option from a boolean type to a tristate.
    - FORCE will now terminate the server if the plugin fails to
      initialize properly.
  * Refactored prototypes for test_plugin_options() and construct_options()
    to get rid of the 'enable' value pointer.
  * Cleaned up code related to option name constructing.
  * Added documentation
sql/sql_plugin.h:
  * Introduced new member to st_plugin_int structure.

UNIX sockets need to be on a path shorter than 70 characters on some older platofrms.
MTRv1 tries to fix this by moving the socket to the $TMPDIR, however this causes
issues with certain tests on Windows.

Fixed by not applying any hacks on Windows - Windows does not need them.

checking in a test case that will reproduce
the error on v5r4.

mysql-test/suite/ibmdb2i/include/have_i54.inc:
  Bug#44232 Error msg should be improved when collation not supported.
mysql-test/suite/ibmdb2i/r/ibmdb2i_bug_44232.result:
  Bug#44232 Error msg should be improved when collation not supported.
mysql-test/suite/ibmdb2i/t/ibmdb2i_bug_44232.test:
  Bug#44232 Error msg should be improved when collation not supported.