and query_cache don't play along nicely.

An alternative for RENAME DATABSE using RENAME TABLE has been used to implement this.

Parts of index_merge_innodb were disabled.These have been enabled with a few changes 
and the test is being made experimental to study it's behaviour.

Also fixed possibly uninitialized use of need_copy_table_res.

post-push fixes for show_slave_io_error= 1 of wait_for_slave_io_error.inc;
Unix and win format path specifically so few tests have to change show_slave_io_error
to zero.

The bug case is similar to one fixed earlier bug_49536.
Deadlock involving LOCK_log appears to be possible because the purge running thread
is holding LOCK_log whereas there is no sense of doing that and which fact was
exploited by the earlier bug fixes.

Fixed with small reengineering of rotate_and_purge(), adding two new methods and
setting up a policy to execute those instead of the former
rotate_and_purge(RP_LOCK_LOG_IS_ALREADY_LOCKED).
The policy for using rotate(), purge() is that if the caller acquires LOCK_log itself,
it should call rotate(), release the mutex and run purge().

Side effect of this patch is refining error message of bug@11747416 to print
the whole path.



mysql-test/suite/rpl/r/rpl_cant_read_event_incident.result:
  the file name printing is changed to a relative path instead of just the file name.
mysql-test/suite/rpl/r/rpl_log_pos.result:
  the file name printing is changed to a relative path instead of just the file name.
mysql-test/suite/rpl/r/rpl_manual_change_index_file.result:
  the file name printing is changed to a relative path instead of just the file name.
mysql-test/suite/rpl/r/rpl_packet.result:
  the file name printing is changed to a relative path instead of just the file name.
mysql-test/suite/rpl/r/rpl_rotate_purge_deadlock.result:
  new result file is added.
mysql-test/suite/rpl/t/rpl_cant_read_event_incident.test:
  The test of that bug can't satisfy windows and unix backslash interpretation so windows
  execution is chosen to bypass.
mysql-test/suite/rpl/t/rpl_rotate_purge_deadlock-master.opt:
  new opt file is added.
mysql-test/suite/rpl/t/rpl_rotate_purge_deadlock.test:
  regression test is added as well as verification of a 
  possible side effect of the fixes is tried.
sql/log.cc:
  LOCK_log is never taken during execution of log purging routine.
  The former MYSQL_BIN_LOG::rotate_and_purge is made to necessarily 
  acquiring and releasing LOCK_log. 
  If caller takes the mutex itself it has to use a new rotate(), purge() 
  methods combination and to never let purge() be run with LOCK_log grabbed.
  
  
  
  split apart to allow
  the caller to chose either it
  Simulation of concurrently rotating/purging threads is added.
sql/log.h:
  new rotate(), purge() methods are added to be used instead of
  the former rotate_and_purge(RP_LOCK_LOG_IS_ALREADY_LOCKED).
  rotate_and_purge() signature is changed. Caller should not call rotate_and_purge()
  but rather {rotate(), purge()} if LOCK_log is acquired by it.
sql/rpl_injector.cc:
  changes to reflect the new rotate_and_purge() signature.
sql/sql_class.h:
  unnecessary constants are removed.
sql/sql_parse.cc:
  changes to reflect the new rotate_and_purge() signature.
sql/sql_reload.cc:
  changes to reflect the new rotate_and_purge() signature.
sql/sql_repl.cc:
  followup for bug@11747416: the file name printing is changed to a relative 
  path instead of just the file name.

row_rename_table_for_mysql(): Return DB_ERROR instead of DB_SUCCESS
when fil_rename_tablespace() returns an error. This bug was introduced
in the InnoDB Plugin.

Approved by Sunny Bains over IM.

TABLE ERROR, RECOVERY
            
rb://792 approved by Sunny Bains

Fixed a misplaced parenthesis, injected due to
syncing from libedit CVS head.

NEW_FRM_MEM WITHOUT NEEDING TO".

During the process of opening tables for a statement, we allocated
memory which was used only during view loading even in cases when the
statement didn't use any views. Such an unnecessary allocation (and
corresponding freeing) might have caused significant performance
overhead in some workloads. For example, it caused up to 15% slowdown
in a simple stored routine calculating Fibonacci's numbers.

This memory was pre-allocated as part of "new_frm_mem" MEM_ROOT
initialization at the beginning of open_tables(). 

This patch addresses this issue by turning off memory pre-allocation
during initialization for this MEM_ROOT. Now, memory on this root
will be allocated only at the point when the first .FRM for a view is 
opened.

The patch doesn't contain a test case since it is hard to test the
performance improvements or the absence of memory allocation in our
test framework.

                      TESTS: CRASH, CORRUPTION, 4G MEMOR

Issue: Valgrind errors due to checksum and optimize
       query against archive tables with null columns.
       Table record buffer was not initialized.

Solution: Initialize the record buffer.

             BREAKS SOURCE RELEASE BUILD

Some of the required files were not getting copied while
performing 'make dist' and hence the build failed for
the created distribution source.

Added the missing files to Makefile.am.

                      TESTS: CRASH, CORRUPTION, 4G MEMOR

Issue: Valgrind errors due to checksum and optimize 
       query angaist archive tables with null columns.
       Table record buffer was not initialized.

Solution: Initialize the record buffer.

btr_record_not_null_field_in_rec(): Remove the parameter rec.
Use rec_offs_nth_sql_null() instead of rec_get_nth_field().

rb:788 approved by Jimmy Yang

               USING MYISAM_USE_MMAP ON WINDOWS

When OPTIMIZE/REPAIR TABLE is switching to new data file,
old data file is removed while memory mapping is still
active.

With 5.1 implementation of nt_share_delete() it is not
permitted to remove mmaped file.

This fix disables memory mapping for mi_repair() operations.

mysql-test/r/myisam.result:
  A test case for BUG#11757032.
mysql-test/t/myisam.test:
  A test case for BUG#11757032.
storage/myisam/ha_myisam.cc:
  mi_repair*() functions family use file I/O even if memory
  mapping is available.
  
  Since mixing mmap I/O and file I/O may cause various artifacts,
  memory mapping must be disabled.
storage/myisam/mi_delete_all.c:
  Clean-up: do not attempt to remap file after truncate, since
  there is nothing to map.

modified function do_get_error in mysqltest.cc to handle multiple variable passed
added test case to mysqltest.test to verify handling to multiple errors passed

               WITH LIBEDIT

Libedit won't build on platforms that do not provide
"sys/cdefs.h".

Removed the inclusion of cdefs.h from all files
other that sys.h, which includes this file only
when the header is found while configuring.

This patch corrects a defect whereby the bootstrap_server() method was
returning 0 instead of the error code generated. The code has been changed to
return the correct value returned from the bootstrap command.

This patch corrects a defect in the building of the DELETE commands for
disabling a plugin whereby only the original plugin data was deleted. If there
were other plugins, the delete did not remove the rows. The code has been
changed to remove all rows from the mysql.plugin table that were inserted when
the plugin was loaded. The test has also been changed to correctly identify if
all rows have been deleted.

warnings are converted to errors, the compiler complains about
the fact that binlog_can_be_corrupted is defined but never used.

We need to check if this is a dead code or if someone removed any
code by mistake.

Updated libedit library.

When temporary tables is used for result sorting
result field for gconcat function is created using
group_concat_max_len size. It leads to result truncation
when character_set_results is multi-byte character set due
to insufficient tmp table field size.
The fix is to increase temporary table field size for
gconcat. Method make_string_field() is overloaded
for Item_func_group_concat class and uses
max_characters * collation.collation->mbmaxlen size for
result field. max_characters is maximum number of characters
what can fit into max_length size.


mysql-test/r/ctype_utf16.result:
  test result
mysql-test/r/ctype_utf32.result:
  test result
mysql-test/r/ctype_utf8.result:
  test result
mysql-test/t/ctype_utf16.test:
  test case
mysql-test/t/ctype_utf32.test:
  test case
mysql-test/t/ctype_utf8.test:
  test case
sql/item.h:
  make Item::make_string_field() virtual
sql/item_sum.cc:
  added Item_func_group_concat::make_string_field(TABLE *table) method
  which uses max_characters * collation.collation->mbmaxlen size for
  result item. max_characters is maximum number of characters what can
  fit into max_length size.
sql/item_sum.h:
  added Item_func_group_concat::make_string_field(TABLE *table) method