A few problems were found in the fix for bug 43668:
1) Comparison of the YEAR column with NULL always returned TRUE;
2) Comparison of the YEAR column with constants always returned
   unpredictable result;
3) Unnecessary conversion warnings when comparing a non-integer
   constant with a NULL value in the YEAR column;

The problems described above have been resolved with an
exception: zero (i.e. invalid) YEAR column value comparison
with 00 or 2000 still fail (it is not a regression and it was
not a regression), so MIN/MAX on YEAR column containing zero
value still fail.


mysql-test/r/type_year.result:
  Test case for bug #49480.
mysql-test/t/type_year.test:
  Test case for bug #49480.
sql/item_cmpfunc.cc:
  - The get_year_value() function has been modified to make its
    return value compatible with the get_datetime_value() return
    value (i.e. to convert numeric values into the YYYY0000000000
    (YYYY-00-00 00:00:00) form.
  
  - The Arg_comparator::set_cmp_func method has been modified to
    use the get_year_value function if get_datetime_value() is not
    applicable.
    From now only 2 cases have a special processing there:
    * both comparing items have MYSQL_TYPE_YEAR field type
            or
    * one item have is MYSQL_TYPE_YEAR and other one is
      is_datetime()-compliant.
  
  - New helper function try_year_cmp_func() has been
    added for the better code readability to call from
    Arg_comparator::set_cmp_func().
  
  - The Arg_comparator::compare_year method has been removed
    since get_year_value() is compatible with the old
    Arg_comparator::compare_datetime method that doesn't have
    problems #1-#3 (see whole patch entry commentary).
sql/item_cmpfunc.h:
  - New helper function try_year_cmp_func() has been
    added for the better code readability to call from
    Arg_comparator::set_cmp_func().
  
  - Unnecessary Arg_comparator::year_as_datetime and
    Arg_comparator::compare_year() declarations have been
    removed.

mysql-test/include/kill_query.inc:
  Error 1034 can be generated when change MyISAM table indexes was interrupted
mysql-test/r/rpl_killed_ddl.result:
  table t4 may not exists because the ALTER above was interrupted
mysql-test/t/rpl_killed_ddl.test:
  table t4 may not exists because the ALTER above was interrupted

      
This fix has been proposed by Sergey Petrunya and has been contributed
under SCA by sca@askmonty.org.
      
The cause for this valgrind error is that in the function
add_cond_and_fix() in sql_select.cc an Item_cond_and object is
created. This is marked as fixed but does not have a correct
table_map() attribute. Later, in make_join_select(), if
engine_condition_pushdown is in use, this table map is used and
results in the valgrind error.
      
The fix is to add a call to update_used_tables() in add_cond_and_fix()
so that the table map is updated correctly.
      
This patch is tested by multiple existing tests (e.g. the tests
innodb_mysql, innodb, fulltext, compress all produces this valgrind
warning/error without this fix).


sql/sql_select.cc:
  In add_cond_and_fix() add a call to update_used_tables() to ensure
  the table map is updated.

There are three issues that caused rpl_killed_ddl fails sporadically
in pb2:

 1) thd->clear_error() was not called before create Query event
if operation is executed successfully.
 2) DATABASE d2 might do exist because the statement to CREATE or
ALTER it was killed
 3) because of bug 43353, kill the query that do DROP FUNCTION or
    DROP PROCEDURE can result in SP not found

This patch fixed all above issues by:
 1) Called thd->clear_error() if the operation succeeded.
 2) Add IF EXISTS to the DROP DATABASE d2 statement
 3) Temporarily disabled testing DROP FUNCTION/PROCEDURE IF EXISTS.

mysql-test/t/rpl_killed_ddl.test:
  DATABASE d2 might not exists, add IF EXITS to the DROP statement
sql/sql_db.cc:
  Called thd->clear_error() if the operation succeeded

Disabled execution in valgrind to avoid false positive memory
leaks due to fault-injection tests (i.e. call to abort()).

Part 2 : 
There was a special optimization on the ref access method for 
ORDER BY ... DESC that was set without actually looking on the type of the 
selected index for ORDER BY.
Fixed the SELECT ... ORDER BY .. DESC (it uses a different code path compared
to the ASC that has been fixed with the previous fix).

Removed rpl_cross_version from experimental list.

{PROCEDURE|FUNCTION} FROM ...'

The master would hit an assertion when binary log was
active. This was due to the fact that the thread's diagnostics
area was being cleared before writing to the binlog,
independently of mysql_routine_grant returning an error or
not. When mysql_routine_grant was to return an error, the return
value and the diagnostics area contents would
mismatch. Consequently, neither my_ok would be called nor an
error would be signaled in the diagnostics area, eventually
triggering the assertion in net_end_statement.

We fix this by not clearing the diagnostics area at binlogging
time. 

solaris after a crash
      
This patch adds a Solaris-specific version of
print_stacktrace() which uses printstack(2), available on all
Solaris versions since Solaris 9. (While Solaris 11 adds
support for the glibc functions backtrace_*() as of
PSARC/2007/162, printstack() is used for consistency over all
Solaris versions.)

The symbol names are mangled, so use of c++filt may be
required as described in the MySQL documentation.


sql/stacktrace.c:
  Added Solaris-specific print_stacktrace().

field='const1' AND field='const2' in some cases

Building multiple equality predicates containing
a constant which is compared as a datetime (with a field)
we should take this fact into account and compare the 
constant with another possible constatns as datetimes 
as well.

E.g. for the
SELECT ... WHERE a='2001-01-01' AND a='2001-01-01 00:00:00'
we should compare '2001-01-01' with '2001-01-01 00:00:00' as
datetimes but not as strings.


mysql-test/r/select.result:
  Fix for bug#49199: Optimizer handles incorrectly: 
  field='const1' AND field='const2' in some cases
    - test result.
mysql-test/t/select.test:
  Fix for bug#49199: Optimizer handles incorrectly: 
  field='const1' AND field='const2' in some cases
    - test case.
sql/item_cmpfunc.cc:
  Fix for bug#49199: Optimizer handles incorrectly: 
  field='const1' AND field='const2' in some cases
    - adding a constant to Item_equal compare it as
  a datetime value with stored one if there's a 
  date[time] field in a equality predicate.
sql/item_cmpfunc.h:
  Fix for bug#49199: Optimizer handles incorrectly: 
  field='const1' AND field='const2' in some cases
    - adding a constant to Item_equal compare it as
  a datetime value with stored one if there's a 
  date[time] field in a equality predicate.
sql/sql_select.cc:
  Fix for bug#49199: Optimizer handles incorrectly: 
  field='const1' AND field='const2' in some cases
    - adding a constant to Item_equal compare it as
  a datetime value with stored one if there's a 
  date[time] field in a equality predicate.

The problem was that the multiple evaluations of a ENCODE or
DECODE function within a single statement caused the random
generator to be reinitialized at each evaluation, even though
the parameters were constants.

The solution is to initialize the random generator only once
if the password (seed) parameter is constant.

This patch borrows code and ideas from Georgi Kodinov's patch.

mysql-test/r/func_str.result:
  Add test case result.
mysql-test/r/ps.result:
  Add test case result.
mysql-test/t/func_str.test:
  Add test case for Bug#49141
mysql-test/t/ps.test:
  Add test case for Bug#49141
sql/item_strfunc.cc:
  Move seed generation code to a separate method.
  Seed only once if the password (seed) argument
  is constant.
  Remove duplicated code and use a transform method
  to apply encoding or decoding.
sql/item_strfunc.h:
  Add parameter to signal whether the PRNG is already seeded.
  Introduce transform method.
  Combine val_str methods.
sql/sql_crypt.cc:
  Remove method.
sql/sql_crypt.h:
  Seed is supplied as two long integers.

Post-merge fix: Redirect stderr to a file as to avoid buffering
problems due to redirecting stderr to stdout.

mysql-test/r/mysql_upgrade.result:
  Update test case result.
mysql-test/t/mysql_upgrade.test:
  Redirect stderr to a file, cat and remove.

This patch fixes three bugs as follows. First, aborting the server while purging
binary logs might generate orphan files due to how the purge operation was
implemented:

          (purge routine - sql/log.cc - MYSQL_BIN_LOG::purge_logs)

      1 - register the files to be removed in a temporary buffer.
      2 - update the log-bin.index.
      3 - flush the log-bin.index.
      4 - erase the files whose names where register in the temporary buffer
      in step 1.

Thus a failure while  executing step 4 would generate an orphan file. Second,
a similar issue might happen while creating a new binary as follows:

          (create routine - sql/log.cc - MYSQL_BIN_LOG::open)

      1 - open the new log-bin.
      2 - update the log-bin.index.

Thus a failure while executing step 1 would generate an orphan file.

To fix these issues, we record the files to be purged or created before really
removing or adding them. So if a failure happens such records can be used to
automatically remove dangling files. The new steps might be outlined as follows:

          (purge routine - sql/log.cc - MYSQL_BIN_LOG::purge_logs)

      1 - register the files to be removed in the log-bin.~rec~ placed in
      the data directory.
      2 - update the log-bin.index.
      3 - flush the log-bin.index.
      4 - delete the log-bin.~rec~.

          (create routine - sql/log.cc - MYSQL_BIN_LOG::open)

      1 - register the file to be created in the log-bin.~rec~
      placed in the data directory.
      2 - open the new log-bin.
      3 - update the log-bin.index.
      4 - delete the log-bin.~rec~.

          (recovery routine - sql/log.cc - MYSQL_BIN_LOG::open_index_file)

      1 - open the log-bin.index.
      2 - open the log-bin.~rec~.
      3 - for each file in log-bin.~rec~.
        3.1 Check if the file is in the log-bin.index and if so ignore it.
        3.2 Otherwise, delete it.

The third issue can be described as follows. The purge operation was allowing
to remove a file in use thus leading to the loss of data and possible
inconsistencies between the master and slave. Roughly, the routine was only
taking into account the dump threads and so if a slave was not connect the
file might be delete even though it was in use.

After-push minor code cleanup for WL 2360: unnecessary external
reference to LOCK_thread_count has been removed from ha_innodb.cc.

"mysql_upgrade (ver 5.1) add 3 fields to mysql.proc table but does
not set values".
            
mysql_upgrade (ver 5.1) adds 3 fields (character_set_client, 
collation_connection and db_collation) to the mysql.proc table, but 
does not set any values. When we run stored procedures, which were 
created with mysql 5.0, a warning is logged into the error log.
            
The solution to this is for mysql_upgrade to set default best guess
values for these fields. A warning is also written during upgrade, to
make the user aware that default values are set.

client/mysql_upgrade.c:
  Result lines which start with "WARNING" are passed through to the output. 
  This way we have a way of triggering WARNING-messages during upgrade 
  directly from the .sql-script.
mysql-test/r/mysql_upgrade.result:
  Expected result of the test.
mysql-test/t/mysql_upgrade.test:
  Added a test-case for the bug.
scripts/mysql_system_tables_fix.sql:
  The new fields are populated, and warnings are written.

Test case cleanup.

mysql-test/r/ps.result:
  Test case cleanup for bug#48508.
mysql-test/t/ps.test:
  Test case cleanup for bug#48508.

When checking for an error after removing the special view error handler the code
was not taking into account that open_tables() may fail because of the current
statement being killed. 
Added a check for thd->killed.
Added a client program to test it.

Problem: Item_char_typecast reported wrong max_length when
casting to BINARY, which lead, in particular, in wrong
"ORDER BY BINARY(char_column)" results.

Fix: making Item_char_typecast report correct max_length.

  @ mysql-test/r/ctype_utf16.result
    Fixing old incorrect test result.
  @ mysql-test/r/ctype_utf32.result
    Fixing old incorrect test result.
  @ mysql-test/r/ctype_utf8.result
    Adding new test
  @ mysql-test/t/ctype_utf8.test
    Adding new test
  @ sql/item_timefunc.cc
    Making Item_char_typecast report correct max_length
    when cast is done to BINARY.

Problem: SHOW CREATE FUNCTION and SELECT DTD_IDENTIFIER FROM I_S.ROUTINES
returned wrong values in case of ENUM return data type and UCS2
character set.

Fix: the string to collect returned data type was incorrectly set to
"binary" character set, therefore UCS2 values where returned with
extra '\0' characters.
Setting string character set to creation_ctx->get_client_cs()
in sp_find_routine(), and to system_charset_info in sp_create_routine
fixes the problem.

Adding tests:
- the original test with Latin letters
- an extra test with non-Latin letters

Actually there is two different bugs.
The first one caused crash on queries with WHERE condition over views
containing WHERE condition. A wrong check for prepared statement phase led
to items for view fields being allocated in the execution memory and freed
at the end of execution. Thus the optimized WHERE condition refers to
unallocated memory on the second execution and server crashed.
The second one caused by the Item_cond::compile function not saving changes
it made to the item tree. Thus on the next execution changes weren't
reverted and server crashed on dereferencing of unallocated space.

The new helper function called is_stmt_prepare_or_first_stmt_execute
is added to the Query_arena class.
The find_field_in_view function now uses
is_stmt_prepare_or_first_stmt_execute() to check whether
newly created view items should be freed at the end of the query execution.
The Item_cond::compile function now saves changes it makes to item tree.

mysql-test/r/ps.result:
  Added a test case for the bug#48508.
mysql-test/t/ps.test:
  Added a test case for the bug#48508.
sql/item_cmpfunc.cc:
  Bug#48508: Crash on prepared statement re-execution.
  The Item_cond::compile function now saves changes it makes to item tree.
sql/sql_base.cc:
  Bug#48508: Crash on prepared statement re-execution.
  The find_field_in_view function now uses
  is_stmt_prepare_or_first_stmt_execute() to check whether
  newly created view items should be freed at the end of the query execution.
sql/sql_class.h:
  Bug#48508: Crash on prepared statement re-execution.
  The Query_arena::is_stmt_prepare_or_first_sp_execute function now correctly
  do its check.

the last IF ELSE part which decides the plugin name is not relevant as we still have
to substitute the occurences of INNOBASE with INNODB_PLUGIN.
Remove the last IF ELSE part in CMakeLists.txt as it doesn't make sense in 5.1.