Flush the proc file after every modifications. This will avoid errors of type "Table './mysql/proc' is marked as crashed and should be repaired"

sql/keycaches.cc:
  Added free_all_rpl_filters() to be able to free all filters at cleanup
sql/keycaches.h:
  Added prototype
sql/rpl_rli.cc:
  Fixed compiler warning
sql/slave.cc:
  Free all rpl_filters at cleanup
sql/sp.cc:
  Fixed compiler warning when not all struct elements was initialized
sql/sql_acl.cc:
  Fixed compiler warning when not all struct elements was initialized
storage/perfschema/table_events_waits.cc:
  Fixed compiler warning when not all struct elements was initialized
storage/perfschema/table_events_waits_summary.cc:
  Fixed compiler warning when not all struct elements was initialized
storage/perfschema/table_ews_global_by_event_name.cc:
  Fixed compiler warning when not all struct elements was initialized
storage/perfschema/table_file_instances.cc:
  Fixed compiler warning when not all struct elements was initialized
storage/perfschema/table_file_summary.cc:
  Fixed compiler warning when not all struct elements was initialized
storage/perfschema/table_performance_timers.cc:
  Fixed compiler warning when not all struct elements was initialized
storage/perfschema/table_setup_consumers.cc:
  Fixed compiler warning when not all struct elements was initialized
storage/perfschema/table_setup_instruments.cc:
  Fixed compiler warning when not all struct elements was initialized
storage/perfschema/table_setup_timers.cc:
  Fixed compiler warning when not all struct elements was initialized
storage/perfschema/table_sync_instances.cc:
  Fixed compiler warning when not all struct elements was initialized
storage/perfschema/table_threads.cc:
  Fixed compiler warning when not all struct elements was initialized
storage/xtradb/os/os0file.c:
  Fixed compiler warning when not all struct elements was initialized

Generalized support for auto-updated and/or auto-initialized timestamp
and datetime columns. This patch is a reimplementation of MySQL's
"WL#5874: CURRENT_TIMESTAMP as DEFAULT for DATETIME columns". In order to
ease future merges, this implementation reused few function and variable
names from MySQL's patch, however the implementation is quite different.

TODO:
The only unresolved problem in this patch is the semantics of LOAD DATA for
TIMESTAMP and DATETIME columns in the cases when there are missing or NULL
columns. I couldn't fully comprehend the logic behind MySQL's behavior and
its relationship with their own documentation, so I left the results to be
more consistent with all other LOAD cases.

The problematic test cases can be seen by running the test file function_defaults,
and observing the test case differences. Those were left on purpose for discussion.

CONSISTENT SNAPSHOT OPTION

A transaction is started with a consistent snapshot.  After 
the transaction is started new indexes are added to the 
table.  Now when we issue an update statement, the optimizer
chooses an index.  When the index scan is being initialized
via ha_innobase::change_active_index(), InnoDB reports 
the error code HA_ERR_TABLE_DEF_CHANGED, with message 
stating that "insufficient history for index".

This error message is propagated up to the SQL layer.  But
the my_error() api is never called.  The statement level
diagnostics area is not updated with the correct error 
status (it remains in Diagnostics_area::DA_EMPTY).  

Hence the following check in the Protocol::end_statement()
fails.

 516   case Diagnostics_area::DA_EMPTY:
 517   default:
 518     DBUG_ASSERT(0);
 519     error= send_ok(thd->server_status, 0, 0, 0, NULL);
 520     break;

The fix is to backport the fix of bugs 14365043, 11761652 
and 11746399. 

14365043 PROTOCOL::END_STATEMENT(): ASSERTION `0' FAILED
11761652 HA_RND_INIT() RESULT CODE NOT CHECKED
11746399 RETURN VALUES OF HA_INDEX_INIT() AND INDEX_INIT() IGNORED

rb://1227 approved by guilhem and mattiasj.

Switch automaticly to statement based replication for statements that can't generate row based events. This is needed to avoid getting
updates to system, statistics and admin tables logged to binary log.
- Removed special code used to temporarily change to statement based replication.
- Changed to a faster and smaller interface for temporarily switching to statement based replication.

sql/event_db_repository.cc:
  Change to new interface to not use row based replication for system table changes.
sql/events.cc:
  Change to new interface to not use row based replication for system table changes.
sql/sp.cc:
  Removed temporarily switching to statement based replication (this is now done automaticly in mysql_execute_command())
sql/sql_acl.cc:
  Change to new interface to not use row based replication for system table changes.
  Removed temporarily switching to statement based replication (this is now done automaticly in mysql_execute_command())
sql/sql_class.h:
  Added new interface for temporarily switching to statement based replication.
sql/sql_parse.cc:
  Mark commands that needs original replication mode with CF_FORCE_ORIGINAL_BINLOG_FORMAT.
  Switch automaticly to statement based replication for statements that can't generate row based events (and can't change replication mode)
sql/sql_udf.cc:
  Removed temporarily switching to statement based replication (this is now done automaticly in mysql_execute_command())

Split ER_NO_SUCH_TABLE into ER_NO_SUCH_TABLE and ER_NO_SUCH_TABLE_IN_ENGINE to be able to distingus if a .frm file is missing or if the table is missing in the engine.


sql/handler.cc:
  Added ER_NO_SUCH_TABLE_IN_ENGINE
sql/rpl_record.cc:
  Fixed wrong printf
sql/share/errmsg-utf8.txt:
  Added ER_NO_SUCH_TABLE_IN_ENGINE
sql/sp.cc:
  Added ER_NO_SUCH_TABLE_IN_ENGINE
sql/sp_head.cc:
  Added ER_NO_SUCH_TABLE_IN_ENGINE
sql/sql_admin.cc:
  Added ER_NO_SUCH_TABLE_IN_ENGINE
sql/sql_base.cc:
  Added ER_NO_SUCH_TABLE_IN_ENGINE
sql/sql_show.cc:
  Added ER_NO_SUCH_TABLE_IN_ENGINE
sql/table.cc:
  Fixed typo

Cleanup:  Changed procedure type from a int/char to an enum for easier to manage and debug code.

mysql-test/r/trigger.result:
  Test that mysql.proc is not used as part of creating or using a trigger.
mysql-test/t/trigger.test:
  Test that mysql.proc is not used as part of creating or using a trigger.
sql/sp.cc:
  The main bug fix is to not look up triggers in mysql.proc; This is done by ignoreing type == TYPE_ENUM_TRIGGER in sp_add_used_routine()
  Cleanup:  Changed procedure type from a int/char to an enum.
sql/sp.h:
  Cleanup:  Changed procedure type from a int/char to an enum.
sql/sp_head.h:
  Cleanup:  Changed procedure type from a int/char to an enum.
sql/sql_db.cc:
  Fix include order
sql/sql_lex.cc:
  Fix include order
sql/sql_parse.cc:
  Cleanup:  Changed procedure type from a int/char to an enum.
sql/sql_show.cc:
  Fix include order
sql/sql_view.cc:
  Fix include order

most tests pass.
5.3 merge is next

BOGUS "THE TABLE MYSQL.PROC IS MISSING,..."

There was a race condition between loading a stored routine
(function/procedure/trigger) specified by fully qualified name
SCHEMA_NAME.PROC_NAME and dropping the stored routine database.

The problem was that there is a window for race condition when one server
thread tries to load a stored routine being executed and the other thread
tries to drop the stored routine schema.

This condition race window exists in implementation of function
mysql_change_db() called by db_load_routine() during loading of stored
routine to cache. Function mysql_change_db() calls check_db_dir_existence()
that might failed because specified database was dropped during concurrent
execution of DROP SCHEMA statement. db_load_routine() calls mysql_change_db()
with flag 'force_switch' set to 'true' value so when referenced db is not found
then my_error() is not called and function mysql_change_db() returns ok.
This shadows information about schema opening error in db_load_routine().
Then db_load_routine() makes attempt to parse stored routine that is failed.
This makes to return error to sp_cache_routines_and_add_tables_aux() but since
during error generation a call to my_error wasn't made and hence
THD::main_da wasn't set we set the generic "mysql.proc table corrupt" error
when running sp_cache_routines_and_add_tables_aux().

The fix is to install an error handler inside db_load_routine() for
the mysql_op_change_db() call, and check later if the ER_BAD_DB_ERROR
was caught.


sql/sql_db.cc:
  Added synchronization point "before_db_dir_check" to emulate a race condition during
  processing of CALL/DROP SCHEMA.

Changed some String.ptr() -> String.c_ptr() for String that are not guaranteed to end with \0
Removed some c_ptr() usage from parameters to functions that takes ptr & length
Use preallocate buffers to avoid calling malloc() for most operations. 


sql/event_db_repository.cc:
  alias is now a String
sql/event_scheduler.cc:
  c_ptr -> c_ptr_safe() to avoid warnings from valgrind.
sql/events.cc:
  c_ptr -> c_ptr_safe() to avoid warnings from valgrind.
  c_ptr -> ptr() as function takes ptr & length
sql/field.cc:
  alias is now a String
sql/field.h:
  alias is now a String
sql/ha_partition.cc:
  alias is now a String
sql/handler.cc:
  alias is now a String
  ptr() -> c_ptr() as string is not guaranteed to be \0 terminated
sql/item.cc:
  Store error parameter in separarte buffer to ensure correct error message
sql/item_func.cc:
  ptr() -> c_ptr_safe() as string is not guaranteed to be \0 terminated
sql/item_sum.h:
  Use my_strtod() instead of my_atof() to not have to make string \0 terminated
sql/lock.cc:
  alias is now a String
sql/log.cc:
  c_ptr() -> ptr() as function takes ptr & length
sql/log_event.cc:
  c_ptr_quick() -> ptr() as we only want to get the pointer to String buffer
sql/opt_range.cc:
  ptr() -> c_ptr() as string is not guaranteed to be \0 terminated
sql/opt_table_elimination.cc:
  alias is now a String
sql/set_var.cc:
  ptr() -> c_ptr() as string is not guaranteed to be \0 terminated
  c_ptr() -> c_ptr_safe() to avoid warnings from valgrind.
  c_ptr() -> ptr() as function takes ptr & length
  Simplify some code.
sql/sp.cc:
  c_ptr() -> ptr() as function takes ptr & length
sql/sp_rcontext.cc:
  alias is now a String
sql/sql_base.cc:
  alias is now a String.
  Here we win a realloc() for most alias usage.
sql/sql_class.cc:
  Use size descriptor for printf() to avoid accessing bytes outside of buffer
sql/sql_insert.cc:
  Change allocation of TABLE as it's now contains a String
  _ptr() -> ptr() as function takes ptr & length
sql/sql_load.cc:
  Use preallocate buffers to avoid calling malloc() for most operations.
sql/sql_parse.cc:
  Use c_ptr_safe() to ensure string is \0 terminated.
sql/sql_plugin.cc:
  c_ptr_quick() -> ptr() as function takes ptr & length
sql/sql_select.cc:
  alias is now a String
sql/sql_show.cc:
  alias is now a String
sql/sql_string.h:
  Added move() function to change who owns the string (owner does the free)
sql/sql_table.cc:
  alias is now a String
  c_ptr() -> c_ptr_safe() to avoid warnings from valgrind.
sql/sql_test.cc:
  c_ptr() -> c_ptr_safe() to avoid warnings from valgrind.
  alias is now a String
sql/sql_trigger.cc:
  c_ptr() -> c_ptr_safe() to avoid warnings from valgrind.
  Use field->init() to setup pointers to alias.
sql/sql_update.cc:
  alias is now a String
sql/sql_view.cc:
  ptr() -> c_ptr_safe() as string is not guaranteed to be \0 terminated
sql/sql_yacc.yy:
  r() -> c_ptr() as string is not guaranteed to be \0 terminated
sql/table.cc:
  alias is now a String
sql/table.h:
  alias is now a String
storage/federatedx/ha_federatedx.cc:
  Remove extra 1 byte alloc that is automaticly done by strmake()
  Ensure that error message ends with \0
storage/maria/ha_maria.cc:
  alias is now a String
storage/myisam/ha_myisam.cc:
  alias is now a String

The problem was that mysql_upgrade failed because DROP DATABASE
refused to drop the 'performance_schema' database when the 
mysql.proc table definition was made temporarily invalid
by dump import.

This patch fixes the problem by adding the error resulting
from opening a damaged mysq.proc table (ER_CANNOT_LOAD_FROM_TABLE),
to the list of errors DROP DATABASE will ignore when trying
to lock stored procedures and functions before deletion.

This problem was a regression introduced by the patch for
Bug#57663.

Test case added to sp-destruct.test.

Reverting the patch.

- Changed TABLE->alias to String to get fewer reallocs when alias are used.
- Preallocate some buffers

Changed some String->c_ptr() -> String->ptr() when \0 is not needed.
Fixed wrong usage of String->ptr() when we need a \0 terminated string.
Use my_strtod() instead of my_atof() to avoid having to add \0 to string.
c_ptr() -> c_ptr_safe() to avoid warnings from valgrind.
zr 

sql/event_db_repository.cc:
  Update usage of TABLE->alias
sql/event_scheduler.cc:
  c_ptr() -> c_ptr_safe()
sql/events.cc:
  c_ptr() -> ptr() as \0 was not needed
sql/field.cc:
  Update usage of TABLE->alias
sql/field.h:
  Update usage of TABLE->alias
sql/ha_partition.cc:
  Update usage of TABLE->alias
sql/handler.cc:
  Update usage of TABLE->alias
  Fixed wrong usage of str.ptr()
sql/item.cc:
  Fixed error where code wrongly assumed string was \0 terminated.
sql/item_func.cc:
  c_ptr() -> c_ptr_safe()
  Update usage of TABLE->alias
sql/item_sum.h:
  Use my_strtod() instead of my_atof() to avoid having to add \0 to string
sql/lock.cc:
  Update usage of TABLE->alias
sql/log.cc:
  c_ptr() -> ptr() as \0 was not needed
sql/log_event.cc:
  c_ptr_quick() -> ptr() as \0 was not needed
sql/opt_range.cc:
  ptr() -> c_ptr() as \0 is needed
sql/opt_subselect.cc:
  Update usage of TABLE->alias
sql/opt_table_elimination.cc:
  Update usage of TABLE->alias
sql/set_var.cc:
  ptr() -> c_ptr() as \0 is needed
  c_ptr() -> c_ptr_safe()
sql/sp.cc:
  c_ptr() -> ptr() as \0 was not needed
sql/sp_rcontext.cc:
  
  Update usage of TABLE->alias
sql/sql_base.cc:
  Preallocate buffers
  Update usage of TABLE->alias
sql/sql_class.cc:
  Fix arguments to sprintf() to work even if string is not \0 terminated
sql/sql_insert.cc:
  Update usage of TABLE->alias
  c_ptr() -> ptr() as \0 was not needed
sql/sql_load.cc:
  Preallocate buffers
  Trivial optimizations
sql/sql_parse.cc:
  Trivial optimization
sql/sql_plugin.cc:
  c_ptr() -> ptr() as \0 was not needed
sql/sql_select.cc:
  Update usage of TABLE->alias
sql/sql_show.cc:
  Update usage of TABLE->alias
sql/sql_string.h:
  Added move() function to move allocated memory from one object to another.
sql/sql_table.cc:
  Update usage of TABLE->alias
  c_ptr() -> c_ptr_safe()
sql/sql_test.cc:
  ptr() -> c_ptr_safe()
sql/sql_trigger.cc:
  Update usage of TABLE->alias
  c_ptr() -> c_ptr_safe()
sql/sql_update.cc:
  Update usage of TABLE->alias
sql/sql_view.cc:
  ptr() -> c_ptr_safe()
sql/sql_yacc.yy:
  ptr() -> c_ptr()
sql/table.cc:
  
  Update usage of TABLE->alias
sql/table.h:
  Changed TABLE->alias to String to get fewer reallocs when alias are used.
storage/federatedx/ha_federatedx.cc:
  Use c_ptr_safe() to ensure strings are \0 terminated.
storage/maria/ha_maria.cc:
  Update usage of TABLE->alias
storage/myisam/ha_myisam.cc:
  Update usage of TABLE->alias
storage/xtradb/row/row0sel.c:
  Ensure that null bits in record are properly reset.
  (Old code didn't work as row_search_for_mysql() can be called twice while reading fields from one row.

           breaks SBR

The problem was that DROP DATABASE ignored any metadata locks on stored
functions and procedures held by other connections. This made it
possible for DROP DATABASE to drop functions/procedures that were in use
by other connections and therefore break statement based replication.
(DROP DATABASE could appear in the binlog before a statement using a
dropped function/procedure.)

This problem was an issue left unresolved by the patch for Bug#30977
where metadata locks for stored functions/procedures were introduced.

This patch fixes the problem by making sure DROP DATABASE takes
exclusive metadata locks on all stored functions/procedures to be
dropped.

Test case added to sp-lock.test.

bug #57006 "Deadlock between HANDLER and FLUSH TABLES WITH READ
LOCK" and bug #54673 "It takes too long to get readlock for
'FLUSH TABLES WITH READ LOCK'".

The first bug manifested itself as a deadlock which occurred
when a connection, which had some table open through HANDLER
statement, tried to update some data through DML statement
while another connection tried to execute FLUSH TABLES WITH
READ LOCK concurrently.

What happened was that FTWRL in the second connection managed
to perform first step of GRL acquisition and thus blocked all
upcoming DML. After that it started to wait for table open
through HANDLER statement to be flushed. When the first connection
tried to execute DML it has started to wait for GRL/the second
connection creating deadlock.

The second bug manifested itself as starvation of FLUSH TABLES
WITH READ LOCK statements in cases when there was a constant
stream of concurrent DML statements (in two or more
connections).

This has happened because requests for protection against GRL
which were acquired by DML statements were ignoring presence of
pending GRL and thus the latter was starved.

This patch solves both these problems by re-implementing GRL
using metadata locks.

Similar to the old implementation acquisition of GRL in new
implementation is two-step. During the first step we block
all concurrent DML and DDL statements by acquiring global S
metadata lock (each DML and DDL statement acquires global IX
lock for its duration). During the second step we block commits
by acquiring global S lock in COMMIT namespace (commit code
acquires global IX lock in this namespace).

Note that unlike in old implementation acquisition of
protection against GRL in DML and DDL is semi-automatic.
We assume that any statement which should be blocked by GRL
will either open and acquires write-lock on tables or acquires
metadata locks on objects it is going to modify. For any such
statement global IX metadata lock is automatically acquired
for its duration.

The first problem is solved because waits for GRL become
visible to deadlock detector in metadata locking subsystem
and thus deadlocks like one in the first bug become impossible.

The second problem is solved because global S locks which
are used for GRL implementation are given preference over
IX locks which are acquired by concurrent DML (and we can
switch to fair scheduling in future if needed).

Important change:
FTWRL/GRL no longer blocks DML and DDL on temporary tables.
Before this patch behavior was not consistent in this respect:
in some cases DML/DDL statements on temporary tables were
blocked while in others they were not. Since the main use cases
for FTWRL are various forms of backups and temporary tables are
not preserved during backups we have opted for consistently
allowing DML/DDL on temporary tables during FTWRL/GRL.

Important change:
This patch changes thread state names which are used when
DML/DDL of FTWRL is waiting for global read lock. It is now
either "Waiting for global read lock" or "Waiting for commit
lock" depending on the stage on which FTWRL is.

Incompatible change:
To solve deadlock in events code which was exposed by this
patch we have to replace LOCK_event_metadata mutex with
metadata locks on events. As result we have to prohibit
DDL on events under LOCK TABLES.

This patch also adds extensive test coverage for interaction
of DML/DDL and FTWRL.

Performance of new and old global read lock implementations
in sysbench tests were compared. There were no significant
difference between new and old implementations.

mysql-test/include/check_ftwrl_compatible.inc:
  Added helper script which allows to check that a statement is
  compatible with FLUSH TABLES WITH READ LOCK.
mysql-test/include/check_ftwrl_incompatible.inc:
  Added helper script which allows to check that a statement is
  incompatible with FLUSH TABLES WITH READ LOCK.
mysql-test/include/handler.inc:
  Adjusted test case to the fact that now DROP TABLE closes
  open HANDLERs for the table to be dropped before checking
  if there active FTWRL in this connection.
mysql-test/include/wait_show_condition.inc:
  Fixed small error in the timeout message. The correct name
  of variable used as parameter for this script is "$condition"
  and not "$wait_condition".
mysql-test/r/delayed.result:
  Added test coverage for scenario which triggered assert in
  metadata locking subsystem.
mysql-test/r/events_2.result:
  Updated test results after prohibiting event DDL operations
  under LOCK TABLES.
mysql-test/r/flush.result:
  Added test coverage for bug #57006 "Deadlock between HANDLER
  and FLUSH TABLES WITH READ LOCK".
mysql-test/r/flush_read_lock.result:
  Added test coverage for various aspects of FLUSH TABLES WITH
  READ LOCK functionality.
mysql-test/r/flush_read_lock_kill.result:
  Adjusted test case after replacing custom global read lock
  implementation with one based on metadata locks. Use new
  debug_sync point. Do not disable concurrent inserts as now
  InnoDB we always use InnoDB table.
mysql-test/r/handler_innodb.result:
  Adjusted test case to the fact that now DROP TABLE closes
  open HANDLERs for the table to be dropped before checking
  if there active FTWRL in this connection.
mysql-test/r/handler_myisam.result:
  Adjusted test case to the fact that now DROP TABLE closes
  open HANDLERs for the table to be dropped before checking
  if there active FTWRL in this connection.
mysql-test/r/mdl_sync.result:
  Adjusted test case after replacing custom global read lock
  implementation with one based on metadata locks. Replaced
  usage of GRL-specific debug_sync's with appropriate sync
  points in MDL subsystem.
mysql-test/suite/perfschema/r/dml_setup_instruments.result:
  Updated test results after removing global
  COND_global_read_lock condition variable.
mysql-test/suite/perfschema/r/func_file_io.result:
  Ensure that this test doesn't affect subsequent tests.
  At the end of its execution enable back P_S instrumentation
  which this test disables at some point.
mysql-test/suite/perfschema/r/func_mutex.result:
  Ensure that this test doesn't affect subsequent tests.
  At the end of its execution enable back P_S instrumentation
  which this test disables at some point.
mysql-test/suite/perfschema/r/global_read_lock.result:
  Adjusted test case to take into account that new GRL
  implementation is based on MDL.
mysql-test/suite/perfschema/r/server_init.result:
  Adjusted test case after replacing custom global read
  lock implementation with one based on MDL and replacing
  LOCK_event_metadata mutex with metadata lock.
mysql-test/suite/perfschema/t/func_file_io.test:
  Ensure that this test doesn't affect subsequent tests.
  At the end of its execution enable back P_S instrumentation
  which this test disables at some point.
mysql-test/suite/perfschema/t/func_mutex.test:
  Ensure that this test doesn't affect subsequent tests.
  At the end of its execution enable back P_S instrumentation
  which this test disables at some point.
mysql-test/suite/perfschema/t/global_read_lock.test:
  Adjusted test case to take into account that new GRL
  implementation is based on MDL.
mysql-test/suite/perfschema/t/server_init.test:
  Adjusted test case after replacing custom global read
  lock implementation with one based on MDL and replacing
  LOCK_event_metadata mutex with metadata lock.
mysql-test/suite/rpl/r/rpl_tmp_table_and_DDL.result:
  Updated test results after prohibiting event DDL under
  LOCK TABLES.
mysql-test/t/delayed.test:
  Added test coverage for scenario which triggered assert in
  metadata locking subsystem.
mysql-test/t/events_2.test:
  Updated test case after prohibiting event DDL operations
  under LOCK TABLES.
mysql-test/t/flush.test:
  Added test coverage for bug #57006 "Deadlock between HANDLER
  and FLUSH TABLES WITH READ LOCK".
mysql-test/t/flush_block_commit.test:
  Adjusted test case after changing thread state name which
  is used when COMMIT waits for FLUSH TABLES WITH READ LOCK
  from "Waiting for release of readlock" to "Waiting for commit
  lock".
mysql-test/t/flush_block_commit_notembedded.test:
  Adjusted test case after changing thread state name which is
  used when DML waits for FLUSH TABLES WITH READ LOCK. Now we
  use "Waiting for global read lock" in this case.
mysql-test/t/flush_read_lock.test:
  Added test coverage for various aspects of FLUSH TABLES WITH
  READ LOCK functionality.
mysql-test/t/flush_read_lock_kill-master.opt:
  We no longer need to use make_global_read_lock_block_commit_loop
  debug tag in this test. Instead we rely on an appropriate
  debug_sync point in MDL code.
mysql-test/t/flush_read_lock_kill.test:
  Adjusted test case after replacing custom global read lock
  implementation with one based on metadata locks. Use new
  debug_sync point. Do not disable concurrent inserts as now
  InnoDB we always use InnoDB table.
mysql-test/t/lock_multi.test:
  Adjusted test case after changing thread state names which
  are used when DML or DDL waits for FLUSH TABLES WITH READ
  LOCK to "Waiting for global read lock".
mysql-test/t/mdl_sync.test:
  Adjusted test case after replacing custom global read lock
  implementation with one based on metadata locks. Replaced
  usage of GRL-specific debug_sync's with appropriate sync
  points in MDL subsystem. Updated thread state names which
  are used when DDL waits for FTWRL.
mysql-test/t/trigger_notembedded.test:
  Adjusted test case after changing thread state names which
  are used when DML or DDL waits for FLUSH TABLES WITH READ
  LOCK to "Waiting for global read lock".
sql/event_data_objects.cc:
  Removed Event_queue_element::status/last_executed_changed
  members and Event_queue_element::update_timing_fields()
  method. We no longer use this class for updating mysql.events
  once event is chosen for execution. Accesses to instances of
  this class in scheduler thread require protection by
  Event_queue::LOCK_event_queue mutex and we try to avoid
  updating table while holding this lock.
sql/event_data_objects.h:
  Removed Event_queue_element::status/last_executed_changed
  members and Event_queue_element::update_timing_fields()
  method. We no longer use this class for updating mysql.events
  once event is chosen for execution. Accesses to instances of
  this class in scheduler thread require protection by
  Event_queue::LOCK_event_queue mutex and we try to avoid
  updating table while holding this lock.
sql/event_db_repository.cc:
  - Changed Event_db_repository methods to not release all
    metadata locks once they are done updating mysql.events
    table. This allows to keep metadata lock protecting
    against GRL and lock protecting particular event around
    until corresponding DDL statement is written to the binary
    log.
  - Removed logic for conditional update of "status" and
    "last_executed" fields from update_timing_fields_for_event()
    method. In the only case when this method is called now
    "last_executed" is always modified and tracking change
    of "status" is too much hassle.
sql/event_db_repository.h:
  Removed logic for conditional update of "status" and
  "last_executed" fields from Event_db_repository::
  update_timing_fields_for_event() method.
  In the only case when this method is called now "last_executed"
  is always modified and tracking change of "status" field is
  too much hassle.
sql/event_queue.cc:
  Changed event scheduler code not to update mysql.events
  table while holding Event_queue::LOCK_event_queue mutex.
  Doing so led to a deadlock with a new GRL implementation.
  This deadlock didn't occur with old implementation due to
  fact that code acquiring protection against GRL ignored
  pending GRL requests (which lead to GRL starvation).
  One of goals of new implementation is to disallow GRL
  starvation and so we have to solve problem with this
  deadlock in a different way.
sql/events.cc:
  Changed methods of Events class to acquire protection
  against GRL while perfoming DDL statement and keep it
  until statement is written to the binary log.
  Unfortunately this step together with new GRL implementation
  exposed deadlock involving Events::LOCK_event_metadata
  and GRL. To solve it Events::LOCK_event_metadata mutex was
  replaced with a metadata lock on event. As a side-effect
  events DDL has to be prohibited under LOCK TABLES even in
  cases when mysql.events table was explicitly locked for
  write.
sql/events.h:
  Replaced Events::LOCK_event_metadata mutex with a metadata
  lock on event.
sql/ha_ndbcluster.cc:
  Updated code after replacing custom global read lock
  implementation with one based on MDL. Since MDL subsystem
  should now be able to detect deadlocks involving metadata
  locks and GRL there is no need for special handling of
  active GRL.
sql/handler.cc:
  Replaced custom implementation of global read lock with
  one based on metadata locks. Consequently when doing
  commit instead of calling method of Global_read_lock
  class to acquire protection against GRL we simply acquire
  IX in COMMIT namespace.
sql/lock.cc:
  Replaced custom implementation of global read lock with
  one based on metadata locks. This step allows to expose
  wait for GRL to deadlock detector of MDL subsystem and
  thus succesfully resolve deadlocks similar to one behind
  bug #57006 "Deadlock between HANDLER and FLUSH TABLES
  WITH READ LOCK". It also solves problem with GRL starvation
  described in bug #54673 "It takes too long to get readlock
  for 'FLUSH TABLES WITH READ LOCK'" since metadata locks used
  by GRL give preference to FTWRL statement instead of DML
  statements (if needed in future this can be changed to
  fair scheduling).
  
  Similar to old implementation of acquisition of GRL is
  two-step. During the first step we block all concurrent
  DML and DDL statements by acquiring global S metadata lock
  (each DML and DDL statement acquires global IX lock for
  its duration). During the second step we block commits by
  acquiring global S lock in COMMIT namespace (commit code
  acquires global IX lock in this namespace).
  
  Note that unlike in old implementation acquisition of
  protection against GRL in DML and DDL is semi-automatic.
  We assume that any statement which should be blocked by GRL
  will either open and acquires write-lock on tables or acquires
  metadata locks on objects it is going to modify. For any such
  statement global IX metadata lock is automatically acquired
  for its duration.
  
  To support this change:
  - Global_read_lock::lock/unlock_global_read_lock and
    make_global_read_lock_block_commit methods were changed
    accordingly.
  - Global_read_lock::wait_if_global_read_lock() and
    start_waiting_global_read_lock() methods were dropped.
    It is now responsibility of code acquiring metadata locks
    opening tables to acquire protection against GRL by
    explicitly taking global IX lock with statement duration.
  - Global variables, mutex and condition variable used by
    old implementation was removed.
  - lock_routine_name() was changed to use statement duration for
    its global IX lock. It was also renamed to lock_object_name()
    as it now also used to take metadata locks on events.
  - Global_read_lock::set_explicit_lock_duration() was added which
    allows not to release locks used for GRL when leaving prelocked
    mode.
sql/lock.h:
  - Renamed lock_routine_name() to lock_object_name() and changed
    its signature to allow its usage for events.
  - Removed broadcast_refresh() function. It is no longer needed
    with new GRL implementation.
sql/log_event.cc:
  Release metadata locks with statement duration at the end
  of processing legacy event for LOAD DATA. This ensures that
  replication thread processing such event properly releases
  its protection against global read lock.
sql/mdl.cc:
  Changed MDL subsystem to support new MDL-based implementation
  of global read lock.
  
  Added COMMIT and EVENTS namespaces for metadata locks. Changed
  thread state name for GLOBAL namespace to "Waiting for global
  read lock".
  
  Optimized MDL_map::find_or_insert() method to avoid taking
  m_mutex mutex when looking up MDL_lock objects for GLOBAL
  or COMMIT namespaces. We keep pre-created MDL_lock objects
  for these namespaces around and simply return pointers to
  these global objects when needed.
  
  Changed MDL_lock/MDL_scoped_lock to properly handle
  notification of insert delayed handler threads when FTWRL
  takes global S lock.
  
  Introduced concept of lock duration. In addition to locks with
  transaction duration which work in the way which is similar to
  how locks worked before (i.e. they are released at the end of
  transaction), locks with statement and explicit duration were
  introduced.
  Locks with statement duration are automatically released at the
  end of statement. Locks with explicit duration require explicit
  release and obsolete concept of transactional sentinel.
  
  * Changed MDL_request and MDL_ticket classes to support notion
    of duration.
  * Changed MDL_context to keep locks with different duration in
    different lists. Changed code handling ticket list to take
    this into account.
  * Changed methods responsible for releasing locks to take into
    account duration of tickets. Particularly public
    MDL_context::release_lock() method now only can release
    tickets with explicit duration (there is still internal
    method which allows to specify duration). To release locks
    with statement or transaction duration one have to use
    release_statement/transactional_locks() methods.
  * Concept of savepoint for MDL subsystem now has to take into
    account locks with statement duration. Consequently
    MDL_savepoint class was introduced and methods working with
    savepoints were updated accordingly.
  * Added methods which allow to set duration for one or all
    locks in the context.
sql/mdl.h:
  Changed MDL subsystem to support new MDL-based implementation
  of global read lock.
  
  Added COMMIT and EVENTS namespaces for metadata locks.
  
  Introduced concept of lock duration. In addition to locks with
  transaction duration which work in the way which is similar to
  how locks worked before (i.e. they are released at the end of
  transaction), locks with statement and explicit duration were
  introduced.
  Locks with statement duration are automatically released at the
  end of statement. Locks with explicit duration require explicit
  release and obsolete concept of transactional sentinel.
  
  * Changed MDL_request and MDL_ticket classes to support notion
    of duration.
  * Changed MDL_context to keep locks with different duration in
    different lists. Changed code handling ticket list to take
    this into account.
  * Changed methods responsible for releasing locks to take into
    account duration of tickets. Particularly public
    MDL_context::release_lock() method now only can release
    tickets with explicit duration (there is still internal
    method which allows to specify duration). To release locks
    with statement or transaction duration one have to use
    release_statement/transactional_locks() methods.
  * Concept of savepoint for MDL subsystem now has to take into
    account locks with statement duration. Consequently
    MDL_savepoint class was introduced and methods working with
    savepoints were updated accordingly.
  * Added methods which allow to set duration for one or all
    locks in the context.
sql/mysqld.cc:
  Removed global mutex and condition variables which were used
  by old implementation of GRL.
  Also we no longer need to initialize Events::LOCK_event_metadata
  mutex as it was replaced with metadata locks on events.
sql/mysqld.h:
  Removed global variable, mutex and condition variables which
  were used by old implementation of GRL.
sql/rpl_rli.cc:
  When slave thread closes tables which were open for handling
  of RBR events ensure that it releases global IX lock which
  was acquired as protection against GRL.
sql/sp.cc:
  Adjusted code to the new signature of lock_object/routine_name(),
  to the fact that one now needs specify duration of lock when
  initializing MDL_request and to the fact that savepoints for MDL
  subsystem are now represented by MDL_savepoint class.
sql/sp_head.cc:
  Ensure that statements in stored procedures release statement
  metadata locks and thus release their protectiong against GRL
  in proper moment in time.
  Adjusted code to the fact that one now needs specify duration
  of lock when initializing MDL_request.
sql/sql_admin.cc:
  Adjusted code to the fact that one now needs specify duration
  of lock when initializing MDL_request.
sql/sql_base.cc:
  - Implemented support for new approach to acquiring protection
    against global read lock. We no longer acquire such protection
    explicitly on the basis of statement flags. Instead we always
    rely on code which is responsible for acquiring metadata locks
    on object to be changed acquiring this protection. This is
    achieved by acquiring global IX metadata lock with statement
    duration. Code doing this also responsible for checking that
    current connection has no active GRL by calling an
    Global_read_lock::can_acquire_protection() method.
    Changed code in open_table() and lock_table_names()
    accordingly.
    Note that as result of this change DDL and DML on temporary
    tables is always compatible with GRL (before it was
    incompatible in some cases and compatible in other cases).
  - To speed-up code acquiring protection against GRL introduced
    m_has_protection_against_grl member in Open_table_context
    class. It indicates that protection was already acquired
    sometime during open_tables() execution and new attempts
    can be skipped.
  - Thanks to new GRL implementation calls to broadcast_refresh()
    became unnecessary and were removed.
  - Adjusted code to the fact that one now needs specify duration
    of lock when initializing MDL_request and to the fact that
    savepoints for MDL subsystem are now represented by
    MDL_savepoint class.
sql/sql_base.h:
  Adjusted code to the fact that savepoints for MDL subsystem are
  now represented by MDL_savepoint class.
  Also introduced Open_table_context::m_has_protection_against_grl
  member which allows to avoid acquiring protection against GRL
  while opening tables if such protection was already acquired.
sql/sql_class.cc:
  Changed THD::leave_locked_tables_mode() after transactional
  sentinel for metadata locks was obsoleted by introduction of
  locks with explicit duration.
sql/sql_class.h:
  - Adjusted code to the fact that savepoints for MDL subsystem
    are now represented by MDL_savepoint class.
  - Changed Global_read_lock class according to changes in
    global read lock implementation:
    * wait_if_global_read_lock and start_waiting_global_read_lock
      are now gone. Instead code needing protection against GRL
      has to acquire global IX metadata lock with statement
      duration itself. To help it new can_acquire_protection()
      was introduced. Also as result of the above change
      m_protection_count member is gone too.
    * Added m_mdl_blocks_commits_lock member to store metadata
      lock blocking commits.
    * Adjusted code to the fact that concept of transactional
      sentinel was obsoleted by concept of lock duration.
  - Removed CF_PROTECT_AGAINST_GRL flag as it is no longer
    necessary. New GRL implementation acquires protection
    against global read lock automagically when statement
    acquires metadata locks on tables or other objects it
    is going to change.
sql/sql_db.cc:
  Adjusted code to the fact that one now needs specify duration
  of lock when initializing MDL_request.
sql/sql_handler.cc:
  Removed call to broadcast_refresh() function. It is no longer
  needed with new GRL implementation.
  Adjusted code after introducing duration concept for metadata
  locks. Particularly to the fact transactional sentinel was
  replaced with explicit duration.
sql/sql_handler.h:
  Renamed mysql_ha_move_tickets_after_trans_sentinel() to
  mysql_ha_set_explicit_lock_duration() after transactional
  sentinel was obsoleted by locks with explicit duration.
sql/sql_insert.cc:
  Adjusted code handling delaying inserts after switching to
  new GRL implementation. Now connection thread initiating
  delayed insert has to acquire global IX lock in addition
  to metadata lock on table being inserted into. This IX lock
  protects against GRL and similarly to SW lock on table being
  inserted into has to be passed to handler thread in order to
  avoid deadlocks.
sql/sql_lex.cc:
  LEX::protect_against_global_read_lock member is no longer
  necessary since protection against GRL is automatically
  taken by code acquiring metadata locks/opening tables.
sql/sql_lex.h:
  LEX::protect_against_global_read_lock member is no longer
  necessary since protection against GRL is automatically
  taken by code acquiring metadata locks/opening tables.
sql/sql_parse.cc:
  - Implemented support for new approach to acquiring protection
    against global read lock. We no longer acquire such protection
    explicitly on the basis of statement flags. Instead we always
    rely on code which is responsible for acquiring metadata locks
    on object to be changed acquiring this protection. This is
    achieved by acquiring global IX metadata lock with statement
    duration. This lock is automatically released at the end of
    statement execution.
  - Changed implementation of CREATE/DROP PROCEDURE/FUNCTION not
    to release metadata locks and thus protection against of GRL
    in the middle of statement execution.
  - Adjusted code to the fact that one now needs specify duration
    of lock when initializing MDL_request and to the fact that
    savepoints for MDL subsystem are now represented by
    MDL_savepoint class.
sql/sql_prepare.cc:
  Adjusted code to the to the fact that savepoints for MDL
  subsystem are now represented by MDL_savepoint class.
sql/sql_rename.cc:
  With new GRL implementation there is no need to explicitly
  acquire protection against GRL before renaming tables.
  This happens automatically in code which acquires metadata
  locks on tables being renamed.
sql/sql_show.cc:
  Adjusted code to the fact that one now needs specify duration
  of lock when initializing MDL_request and to the fact that
  savepoints for MDL subsystem are now represented by
  MDL_savepoint class.
sql/sql_table.cc:
  - With new GRL implementation there is no need to explicitly
    acquire protection against GRL before dropping tables.
    This happens automatically in code which acquires metadata
    locks on tables being dropped.
  - Changed mysql_alter_table() not to release lock on new table
    name explicitly and to rely on automatic release of locks
    at the end of statement instead. This was necessary since
    now MDL_context::release_lock() is supported only for locks
    for explicit duration.
sql/sql_trigger.cc:
  With new GRL implementation there is no need to explicitly
  acquire protection against GRL before changing table triggers.
  This happens automatically in code which acquires metadata
  locks on tables which triggers are to be changed.
sql/sql_update.cc:
  Fix bug exposed by GRL testing. During prepare phase acquire
  only S metadata locks instead of SW locks to keep prepare of
  multi-UPDATE compatible with concurrent LOCK TABLES WRITE
  and global read lock.
sql/sql_view.cc:
  With new GRL implementation there is no need to explicitly
  acquire protection against GRL before creating view.
  This happens automatically in code which acquires metadata
  lock on view to be created.
sql/sql_yacc.yy:
  LEX::protect_against_global_read_lock member is no longer
  necessary since protection against GRL is automatically
  taken by code acquiring metadata locks/opening tables.
sql/table.cc:
  Adjusted code to the fact that one now needs specify duration
  of lock when initializing MDL_request.
sql/table.h:
  Adjusted code to the fact that one now needs specify duration
  of lock when initializing MDL_request.
sql/transaction.cc:
  Replaced custom implementation of global read lock with
  one based on metadata locks. Consequently when doing
  commit instead of calling method of Global_read_lock
  class to acquire protection against GRL we simply acquire
  IX in COMMIT namespace.
  Also adjusted code to the fact that MDL savepoint is now
  represented by MDL_savepoint class.

- Fixed bug in pagecache_delete_internal() when deleting block that was flushed by another thread (fixed bug when block->next_used was unexpectedly null)
Fixed some using uninitialized memory warnings found by valgrind. 

mysql-test/t/information_schema_all_engines-master.opt:
  Added options to make slow test run faster
sql/sp.cc:
  Fixed valgrind warning.
sql/sql_show.cc:
  Fixed valgrind warning.
storage/maria/ma_bitmap.c:
  Fixed wrong call parameter to pagecache_unlock_by_link() that caused assert crash in pagecache
storage/maria/ma_pagecache.c:
  Fixed possible error in pagecache_wait_lock() when hash_link was not set. (We never hit this issue, but could be possible when two threads updates the same page.
  Fixed bug in pagecache_delete_internal() when deleting block that was flushed by another thread (fixed bug when block->next_used was unexpectedly null)
  Cleanup: moved pagecache_pthread_mutex_unlock() over comments and asserts to be just before pagecache_fwrite()

Avoid doing reallocs
Prealloc some strings / provide extension allocation size to some strings
This gave a 25 % speedup in some mysql-test-run tests.



mysys/safemalloc.c:
  More DBUG_PRINT
sql/net_serv.cc:
  Make all mallocs() look the similar. (just-for-safety fix)
sql/protocol.cc:
  Ensure that communication packet buffer is allocated.
  (It's freed by stored precedures and some DLL statements)
sql/sp.cc:
  Fixed valgrind warning
sql/sql_select.cc:
  Set extent allocation for buffer that has a lot of append() calls.
sql/sql_show.cc:
  Fixed wrong usage of string buffer. Old code worked in test suite 'just-by-chance'
sql/sql_string.cc:
  Call realloc_with_extra_if_needed() in append() functions.
sql/sql_string.h:
  Added 'extra_alloc' member, to specify chunck size for realloc().
  extra_alloc is addaptive to catch cases where preallocation of buffers is not done properly.
  Simplified free() to allow compiler to optimize things better (and to keep things consistent).
  Fixed shrink() to take into account the extra memory added to the Alloced_length in realloc(). This saves us a realloc() per query.
sql/sql_test.cc:
  Set extent allocation for buffer that has a lot of append() calls.
sql/table.cc:
  Set extent allocation for buffer that has a lot of append() calls.

set to 128k.

sql/sp.cc:
  Added checking for stack overrun at functions
  db_load_routine/sp_find_routine.
sql/sp_head.cc:
  sp_head::execute() modified: pass constant value STACK_MIN_SIZE
  instead of 8 * STACK_MIN_SIZE  as second argument value
  in call to check_stack_overrun. Added checking for stack overrun
  at functions sp_lex_keeper::reset_lex_and_exec_core/sp_instr_stmt::execute.
sql/sql_parse.cc:
  check_stack_overrun modified: allocate buffer for error message
  at heap instead of stack.
  parse_sql modified: added call to check_stack_overrun() before
  parsing of sql statement.

discover its existence".

The problem was that user without any privileges on 
routine was able to find out whether it existed or not.
DROP FUNCTION and DROP PROCEDURE statements were 
checking if routine being dropped existed and reported 
ER_SP_DOES_NOT_EXIST error/warning before checking 
if user had enough privileges to drop it.

This patch solves this problem by changing code not to 
check if routine exists before checking if user has enough 
privileges to drop it. Moreover we no longer perform this 
check using a separate call instead we rely on 
sp_drop_routine() returning SP_KEY_NOT_FOUND if routine 
doesn't exist.

This change also simplifies one of upcoming patches
refactoring global read lock implementation.

mysql-test/r/grant.result:
  Updated test case after fixing bug#57061 "User without
  privilege on routine can discover its existence". Removed
  DROP PROCEDURE/FUNCTION statements which have started to
  fail after this fix (correctly). There is no need in
  dropping routines in freshly created database anyway.
mysql-test/r/sp-security.result:
  Added new test case for bug#57061 "User without privilege
  on routine can discover its existence". Updated existing
  tests according to new behaviour.
mysql-test/suite/funcs_1/r/innodb_storedproc_06.result:
  Updated test case after fixing bug#57061 "User without
  privilege on routine can discover its existence".
  Now we drop routines under user which has enough
  privileges to do so.
mysql-test/suite/funcs_1/r/memory_storedproc_06.result:
  Updated test case after fixing bug#57061 "User without
  privilege on routine can discover its existence".
  Now we drop routines under user which has enough
  privileges to do so.
mysql-test/suite/funcs_1/r/myisam_storedproc_06.result:
  Updated test case after fixing bug#57061 "User without
  privilege on routine can discover its existence".
  Now we drop routines under user which has enough
  privileges to do so.
mysql-test/suite/funcs_1/storedproc/storedproc_06.inc:
  Updated test case after fixing bug#57061 "User without
  privilege on routine can discover its existence".
  Now we drop routines under user which has enough
  privileges to do so.
mysql-test/t/grant.test:
  Updated test case after fixing bug#57061 "User without
  privilege on routine can discover its existence". Removed
  DROP PROCEDURE/FUNCTION statements which have started to
  fail after this fix (correctly). There is no need in
  dropping routines in freshly created database anyway.
mysql-test/t/sp-security.test:
  Added new test case for bug#57061 "User without privilege
  on routine can discover its existence". Updated existing
  tests according to new behaviour.
sql/sp.cc:
  Removed sp_routine_exists_in_table() which is no longer
  used.
sql/sp.h:
  Removed sp_routine_exists_in_table() which is no longer
  used.
sql/sql_parse.cc:
  When dropping routine we no longer check if routine exists 
  before checking if user has enough privileges to do so. 
  Moreover we no longer perform this check using a separate 
  call instead we rely on sp_drop_routine() returning 
  SP_KEY_NOT_FOUND if routine doesn't exist.

Fall back to use ALTER TABLE for engines that doesn't support REPAIR when doing repair for upgrade.
Nicer output from mysql_upgrade and mysql_check
Updated all arrays that used NAME_LEN to use SAFE_NAME_LEN to ensure that we don't break things accidently as names can now have a #mysql50# prefix.

client/mysql_upgrade.c:
  If we are using verbose, also run mysqlcheck in verbose mode.
client/mysqlcheck.c:
  Add more information if running in verbose mode
  Print 'Needs upgrade' instead of complex error if table needs to be upgraded
  Don't write connect information if verbose is not 2 or above
mysql-test/r/drop.result:
  Updated test and results as we now support full table names
mysql-test/r/grant.result:
  Now you get a correct error message if using #mysql with paths
mysql-test/r/show_check.result:
  Update results as table names can temporarly be bigger than NAME_LEN (during upgrade)
mysql-test/r/upgrade.result:
  Test upgrade for long table names.
mysql-test/suite/funcs_1/r/is_tables_is.result:
  Updated old test result (had note been updated in a while)
mysql-test/t/drop.test:
  Updated test and results as we now support full table names
mysql-test/t/grant.test:
  Now you get a correct error message if using #mysql with paths
mysql-test/t/upgrade.test:
  Test upgrade for long table names.
sql/ha_partition.cc:
  NAME_LEN -> SAFE_NAME_LEN
sql/item.cc:
  NAME_LEN -> SAFE_NAME_LEN
sql/log_event.cc:
  NAME_LEN -> SAFE_NAME_LEN
sql/mysql_priv.h:
  Added SAFE_NAME_LEN
sql/rpl_filter.cc:
  NAME_LEN -> SAFE_NAME_LEN
sql/sp.cc:
  NAME_LEN -> SAFE_NAME_LEN
sql/sp_head.cc:
  NAME_LEN -> SAFE_NAME_LEN
sql/sql_acl.cc:
  NAME_LEN -> SAFE_NAME_LEN
sql/sql_base.cc:
  NAME_LEN -> SAFE_NAME_LEN
sql/sql_connect.cc:
  NAME_LEN -> SAFE_NAME_LEN
sql/sql_parse.cc:
  NAME_LEN -> SAFE_NAME_LEN
sql/sql_prepare.cc:
  NAME_LEN -> SAFE_NAME_LEN
sql/sql_select.cc:
  NAME_LEN -> SAFE_NAME_LEN
sql/sql_show.cc:
  NAME_LEN -> SAFE_NAME_LEN
  Enlarge table names for SHOW TABLES to also include optional #mysql50#
sql/sql_table.cc:
  Fall back to use ALTER TABLE for engines that doesn't support REPAIR when doing repair for upgrade.
sql/sql_trigger.cc:
  NAME_LEN -> SAFE_NAME_LEN
sql/sql_udf.cc:
  NAME_LEN -> SAFE_NAME_LEN
sql/sql_view.cc:
  NAME_LEN -> SAFE_NAME_LEN
sql/table.cc:
  Fixed check_table_name() to not count #mysql50# as part of name
  If #mysql50# is part of the name, don't allow path characters in name.

```---------------------------------------------------------
revno: 3124
revision-id: dlenev@mysql.com-20100831090419-rzr5ktekby2gspm1
parent: alik@sun.com-20100827083901-x4wvtc10u9p7gcs9
committer: Dmitry Lenev <dlenev@mysql.com>
branch nick: mysql-5.5-rt-56137
timestamp: Tue 2010-08-31 13:04:19 +0400
message:
  Bug #56137 "Assertion `thd->lock == 0' failed on upgrading 
  from 5.1.50 to 5.5.6".
  
  Debug builds of the server aborted due to an assertion
  failure when DROP DATABASE statement was run on an
  installation which had outdated or corrupt mysql.proc table.
  Particularly this affected the mysql_upgrade tool which is
  run as part of 5.1 to 5.5 upgrade.
  
  The problem was that sp_drop_db_routines(), which was invoked
  during dropping of the database, could have returned without
  closing and unlocking mysql.proc table in cases when this
  table was not up-to-date with the current server. As a result
  further attempt to open and lock the mysql.event table, which
  was necessary to complete dropping of the database, ended up
  with an assert.
  
  This patch solves this problem by ensuring that
  sp_drop_db_routines() always closes mysql.proc table and
  releases metadata locks on it. This is achieved by changing
  open_proc_table_for_update() function to close tables and
  release metadata locks acquired by it in case of failure.
  This step also makes behavior of the latter function
  consistent with behavior of open_proc_table_for_read()/
  open_and_lock_tables().
  
  
  Test case for this bug was added to sp-destruct.test.
```

---------------------------------------------------------

from 5.1.50 to 5.5.6".

Debug builds of the server aborted due to an assertion
failure when DROP DATABASE statement was run on an
installation which had outdated or corrupt mysql.proc table.
Particularly this affected the mysql_upgrade tool which is
run as part of 5.1 to 5.5 upgrade.

The problem was that sp_drop_db_routines(), which was invoked
during dropping of the database, could have returned without
closing and unlocking mysql.proc table in cases when this
table was not up-to-date with the current server. As a result
further attempt to open and lock the mysql.event table, which
was necessary to complete dropping of the database, ended up
with an assert.

This patch solves this problem by ensuring that
sp_drop_db_routines() always closes mysql.proc table and
releases metadata locks on it. This is achieved by changing
open_proc_table_for_update() function to close tables and
release metadata locks acquired by it in case of failure.
This step also makes behavior of the latter function
consistent with behavior of open_proc_table_for_read()/
open_and_lock_tables().


Test case for this bug was added to sp-destruct.test.

This patch also fixes Bug#55452 "SET PASSWORD is
replicated twice in RBR mode".

The goal of this patch is to remove the release of 
metadata locks from close_thread_tables().
This is necessary to not mistakenly release
the locks in the course of a multi-step
operation that involves multiple close_thread_tables()
or close_tables_for_reopen().

On the same token, move statement commit outside 
close_thread_tables().

Other cleanups:
Cleanup COM_FIELD_LIST.
Don't call close_thread_tables() in COM_SHUTDOWN -- there
are no open tables there that can be closed (we leave
the locked tables mode in THD destructor, and this
close_thread_tables() won't leave it anyway).

Make open_and_lock_tables() and open_and_lock_tables_derived()
call close_thread_tables() upon failure.
Remove the calls to close_thread_tables() that are now
unnecessary.

Simplify the back off condition in Open_table_context.

Streamline metadata lock handling in LOCK TABLES 
implementation.

Add asserts to ensure correct life cycle of 
statement transaction in a session.

Remove a piece of dead code that has also become redundant
after the fix for Bug 37521.

mysql-test/r/variables.result:
  Update results: set @@autocommit and statement transaction/
  prelocked mode.
mysql-test/r/view.result:
  A harmless change in CHECK TABLE <view> status for a broken view.
  If previously a failure to prelock all functions used in a view 
  would leave the connection in LTM_PRELOCKED mode, now we call
  close_thread_tables() from open_and_lock_tables()
  and leave prelocked mode, thus some check in mysql_admin_table() that
  works only in prelocked/locked tables mode is no longer activated.
mysql-test/suite/rpl/r/rpl_row_implicit_commit_binlog.result:
  Fixed Bug#55452 "SET PASSWORD is replicated twice in
  RBR mode": extra binlog events are gone from the
  binary log.
mysql-test/t/variables.test:
  Add a test case: set autocommit and statement transaction/prelocked
  mode.
sql/event_data_objects.cc:
  Simplify code in Event_job_data::execute().
  Move sp_head memory management to lex_end().
sql/event_db_repository.cc:
  Move the release of metadata locks outside
  close_thread_tables().
  Make sure we call close_thread_tables() when
  open_and_lock_tables() fails and remove extra
  code from the events data dictionary.
  Use close_mysql_tables(), a new internal
  function to properly close mysql.* tables
  in the data dictionary.
  Contract Event_db_repository::drop_events_by_field,
  drop_schema_events into one function.
  When dropping all events in a schema,
  make sure we don't mistakenly release all
  locks acquired by DROP DATABASE. These
  include locks on the database name
  and the global intention exclusive
  metadata lock.
sql/event_db_repository.h:
  Function open_event_table() does not require an instance 
  of Event_db_repository.
sql/events.cc:
  Use close_mysql_tables() instead of close_thread_tables()
  to bootstrap events, since the latter no longer
  releases metadata locks.
sql/ha_ndbcluster.cc:
  - mysql_rm_table_part2 no longer releases
  acquired metadata locks. Do it in the caller.
sql/ha_ndbcluster_binlog.cc:
  Deploy the new protocol for closing thread
  tables in run_query() and ndb_binlog_index
  code.
sql/handler.cc:
  Assert that we never call ha_commit_trans/
  ha_rollback_trans in sub-statement, which
  is now the case.
sql/handler.h:
  Add an accessor to check whether THD_TRANS object
  is empty (has no transaction started).
sql/log.cc:
  Update a comment.
sql/log_event.cc:
  Since now we commit/rollback statement transaction in 
  mysql_execute_command(), we need a mechanism to communicate
  from Query_log_event::do_apply_event() to mysql_execute_command()
  that the statement transaction should be rolled back, not committed.
  Ideally it would be a virtual method of THD. I hesitate
  to make THD a virtual base class in this already large patch.
  Use a thd->variables.option_bits for now.
  
  Remove a call to close_thread_tables() from the slave IO
  thread. It doesn't open any tables, and the protocol
  for closing thread tables is more complicated now.
  
  Make sure we properly close thread tables, however, 
  in Load_data_log_event, which doesn't
  follow the standard server execution procedure
  with mysql_execute_command().
  @todo: this piece should use Server_runnable
  framework instead.
  Remove an unnecessary call to mysql_unlock_tables().
sql/rpl_rli.cc:
  Update Relay_log_info::slave_close_thread_tables()
  to follow the new close protocol.
sql/set_var.cc:
  Remove an unused header.
sql/slave.cc:
  Remove an unnecessary call to
  close_thread_tables().
sql/sp.cc:
  Remove unnecessary calls to close_thread_tables()
  from SP DDL implementation. The tables will
  be closed by the caller, in mysql_execute_command().
  When dropping all routines in a database, make sure
  to not mistakenly drop all metadata locks acquired
  so far, they include the scoped lock on the schema.
sql/sp_head.cc:
  Correct the protocol that closes thread tables
  in an SP instruction.
  Clear lex->sphead before cleaning up lex
  with lex_end to make sure that we don't
  delete the sphead twice. It's considered
  to be "cleaner" and more in line with
  future changes than calling delete lex->sphead
  in other places that cleanup the lex.
sql/sp_head.h:
  When destroying m_lex_keeper of an instruction,
  don't delete the sphead that all lex objects
  share. 
  @todo: don't store a reference to routine's sp_head
  instance in instruction's lex.
sql/sql_acl.cc:
  Don't call close_thread_tables() where the caller will
  do that for us.
  Fix Bug#55452 "SET PASSWORD is replicated twice in RBR 
  mode" by disabling RBR replication in change_password()
  function.
  Use close_mysql_tables() in bootstrap and ACL reload
  code to make sure we release all metadata locks.
sql/sql_base.cc:
  This is the main part of the patch:
  - remove manipulation with thd->transaction
  and thd->mdl_context from close_thread_tables().
  Now this function is only responsible for closing
  tables, nothing else.
  This is necessary to be able to easily use
  close_thread_tables() in procedures, that
  involve multiple open/close tables, which all
  need to be protected continuously by metadata
  locks.
  Add asserts ensuring that TABLE object
  is only used when is protected by a metadata lock.
  Simplify the back off condition of Open_table_context,
  we no longer need to look at the autocommit mode.
  Make open_and_lock_tables() and open_normal_and_derived_tables()
  close thread tables and release metadata locks acquired so-far 
  upon failure. This simplifies their usage.
  Implement close_mysql_tables().
sql/sql_base.h:
  Add declaration for close_mysql_tables().
sql/sql_class.cc:
  Remove a piece of dead code that has also become redundant
  after the fix for Bug 37521.
  The code became dead when my_eof() was made a non-protocol method,
  but a method that merely modifies the diagnostics area.
  The code became redundant with the fix for Bug#37521, when 
  we started to cal close_thread_tables() before
  Protocol::end_statement().
sql/sql_do.cc:
  Do nothing in DO if inside a substatement
  (the assert moved out of trans_rollback_stmt).
sql/sql_handler.cc:
  Add comments.
sql/sql_insert.cc:
  Remove dead code. 
  Release metadata locks explicitly at the
  end of the delayed insert thread.
sql/sql_lex.cc:
  Add destruction of lex->sphead to lex_end(),
  lex "reset" method called at the end of each statement.
sql/sql_parse.cc:
  Move close_thread_tables() and other related
  cleanups to mysql_execute_command()
  from dispatch_command(). This has become
  possible after the fix for Bug#37521.
  Mark federated SERVER statements as DDL.
  
  Next step: make sure that we don't store
  eof packet in the query cache, and move
  the query cache code outside mysql_parse.
  
  Brush up the code of COM_FIELD_LIST.
  Remove unnecessary calls to close_thread_tables().
  
  When killing a query, don't report "OK"
  if it was a suicide.
sql/sql_parse.h:
  Remove declaration of a function that is now static.
sql/sql_partition.cc:
  Remove an unnecessary call to close_thread_tables().
sql/sql_plugin.cc:
  open_and_lock_tables() will clean up
  after itself after a failure.
  Move close_thread_tables() above
  end: label, and replace with close_mysql_tables(),
  which will also release the metadata lock
  on mysql.plugin.
sql/sql_prepare.cc:
  Now that we no longer release locks in close_thread_tables()
  statement prepare code has become more straightforward.
  Remove the now redundant check for thd->killed() (used
  only by the backup project) from Execute_server_runnable.
  Reorder code to take into account that now mysql_execute_command()
  performs lex->unit.cleanup() and close_thread_tables().
sql/sql_priv.h:
  Add a new option to server options to interact
  between the slave SQL thread and execution
  framework (hack). @todo: use a virtual
  method of class THD instead.
sql/sql_servers.cc:
  Due to Bug 25705 replication of 
  DROP/CREATE/ALTER SERVER is broken.
  Make sure at least we do not attempt to 
  replicate these statements using RBR,
  as this violates the assert in close_mysql_tables().
sql/sql_table.cc:
  Do not release metadata locks in mysql_rm_table_part2,
  this is done by the caller.
  Do not call close_thread_tables() in mysql_create_table(),
  this is done by the caller. 
  Fix a bug in DROP TABLE under LOCK TABLES when,
  upon error in wait_while_table_is_used() we would mistakenly
  release the metadata lock on a non-dropped table.
  Explicitly release metadata locks when doing an implicit
  commit.
sql/sql_trigger.cc:
  Now that we delete lex->sphead in lex_end(),
  zero the trigger's sphead in lex after loading
  the trigger, to avoid double deletion.
sql/sql_udf.cc:
  Use close_mysql_tables() instead of close_thread_tables().
sql/sys_vars.cc:
  Remove code added in scope of WL#4284 which would
  break when we perform set @@session.autocommit along
  with setting other variables and using tables or functions.
  A test case added to variables.test.
sql/transaction.cc:
  Add asserts.
sql/tztime.cc:
  Use close_mysql_tables() rather than close_thread_tables().

            strict aliasing violations.

One somewhat major source of strict-aliasing violations and
related warnings is the SQL_LIST structure. For example,
consider its member function `link_in_list` which takes
a pointer to pointer of type T (any type) as a pointer to
pointer to unsigned char. Dereferencing this pointer, which
is done to reset the next field, violates strict-aliasing
rules and might cause problems for surrounding code that
uses the next field of the object being added to the list.

The solution is to use templates to parametrize the SQL_LIST
structure in order to deference the pointers with compatible
types. As a side bonus, it becomes possible to remove quite
a few casts related to acessing data members of SQL_LIST.

sql/handler.h:
  Use the appropriate template type argument.
sql/item.cc:
  Remove now-unnecessary cast.
sql/item_subselect.cc:
  Remove now-unnecessary casts.
sql/item_sum.cc:
  Use the appropriate template type argument.
  Remove now-unnecessary cast.
sql/mysql_priv.h:
  Move SQL_LIST structure to sql_list.h
  Use the appropriate template type argument.
sql/sp.cc:
  Remove now-unnecessary casts.
sql/sql_delete.cc:
  Use the appropriate template type argument.
  Remove now-unnecessary casts.
sql/sql_derived.cc:
  Remove now-unnecessary casts.
sql/sql_lex.cc:
  Remove now-unnecessary casts.
sql/sql_lex.h:
  SQL_LIST now takes a template type argument which must
  match the type of the elements of the list. Use forward
  declaration when the type is not available, it is used
  in pointers anyway.
sql/sql_list.h:
  Rename SQL_LIST to SQL_I_List. The template parameter is
  the type of object that is stored in the list.
sql/sql_olap.cc:
  Remove now-unnecessary casts.
sql/sql_parse.cc:
  Remove now-unnecessary casts.
sql/sql_prepare.cc:
  Remove now-unnecessary casts.
sql/sql_select.cc:
  Remove now-unnecessary casts.
sql/sql_show.cc:
  Remove now-unnecessary casts.
sql/sql_table.cc:
  Remove now-unnecessary casts.
sql/sql_trigger.cc:
  Remove now-unnecessary casts.
sql/sql_union.cc:
  Remove now-unnecessary casts.
sql/sql_update.cc:
  Remove now-unnecessary casts.
sql/sql_view.cc:
  Remove now-unnecessary casts.
sql/sql_yacc.yy:
  Remove now-unnecessary casts.
storage/myisammrg/ha_myisammrg.cc:
  Remove now-unnecessary casts.

* remove handler::index_read_last()
* create handler::keyread_read_time() (was get_index_only_read_time() in opt_range.cc)
* ha_show_status() allows engine's show_status() to fail
* remove HTON_FLUSH_AFTER_RENAME
* fix key_cmp_if_same() to work for floats and doubles
* set table->status in the server, don't force engines to do it
* increment status vars in the server, don't force engines to do it

mysql-test/r/status_user.result:
  correct test results - innodb was wrongly counting internal
  index searches as handler_read_* calls.
sql/ha_partition.cc:
  compensate for handler incrementing status counters -
  we want to count only calls to underlying engines
sql/handler.h:
  inline methods moved to sql_class.h
sql/key.cc:
  simplify the check
sql/opt_range.cc:
  move get_index_only_read_time to the handler class
sql/sp.cc:
  don't use a key that's stored in the record buffer -
  the engine can overwrite the buffer with anything, destroying the key
sql/sql_class.h:
  inline handler methods that need to see THD and TABLE definitions
sql/sql_select.cc:
  no ha_index_read_last_map anymore
sql/sql_table.cc:
  remove HTON_FLUSH_AFTER_RENAME
sql/table.cc:
  set HA_CAN_MEMCMP as appropriate
sql/tztime.cc:
  don't use a key that's stored in the record buffer -
  the engine can overwrite the buffer with anything, destroying the key
storage/myisam/ha_myisam.cc:
  engines don't need to update table->status or use ha_statistic_increment anymore
storage/myisam/ha_myisam.h:
  index_read_last_map is no more

            Item_hex_string::Item_hex_string

The status of memory allocation in the Lex_input_stream (called
from the Parser_state constructor) was not checked which led to
a parser crash in case of the out-of-memory error.

The solution is to introduce new init() member function in
Parser_state and Lex_input_stream so that status of memory
allocation can be returned to the caller.

mysql-test/r/error_simulation.result:
  Added a test case for bug #42064.
mysql-test/t/error_simulation.test:
  Added a test case for bug #42064.
mysys/my_alloc.c:
  Added error injection code for the regression test.
mysys/my_malloc.c:
  Added error injection code for the regression test.
mysys/safemalloc.c:
  Added error injection code for the regression test.
sql/event_data_objects.cc:
  Use the new init() member function of Parser_state and check
  its return value to handle memory allocation failures.
sql/mysqld.cc:
  Added error injection code for the regression test.
sql/sp.cc:
  Use the new init() member function of Parser_state and check
  its return value to handle memory allocation failures.
sql/sql_lex.cc:
  Moved memory allocation from constructor to the separate init()
  member function.
  Added error injection code for the regression test.
sql/sql_lex.h:
  Moved memory allocation from constructor to the separate init()
  member function.
sql/sql_parse.cc:
  Use the new init() member function of Parser_state and check
  its return value to handle memory allocation failures.
sql/sql_partition.cc:
  Use the new init() member function of Parser_state and check
  its return value to handle memory allocation failures.
sql/sql_prepare.cc:
  Use the new init() member function of Parser_state and check
  its return value to handle memory allocation failures.
sql/sql_trigger.cc:
  Use the new init() member function of Parser_state and check
  its return value to handle memory allocation failures.
sql/sql_view.cc:
  Use the new init() member function of Parser_state and check
  its return value to handle memory allocation failures..
sql/thr_malloc.cc:
  Added error injection code for the regression test.

Stored routine DDL statements use statement-based replication
regardless of the current binlog format. The problem here was
that if a DDL statement failed during metadata lock acquisition
or opening of mysql.proc, the binlog format would not be reset
before returning. So the following DDL or DML statements are 
binlogged with a wrong binlog format, which causes the slave 
to stop.

The problem can be resolved by grabbing an exclusive MDL lock firstly
instead of clearing the current binlog format. So that the binlog
format will not be affected when the lock grab returns directly with
an error. The same way is taken to open a proc table for update.


mysql-test/suite/rpl/r/rpl_tmp_table_and_DDL.result:
  Test Result for bug#51839
mysql-test/suite/rpl/t/rpl_tmp_table_and_DDL.test:
  Added test to make sure the binlog format is not changed
  after a execution of DDL with a table locked.
sql/sp.cc:
  Grab an exclusive MDL lock and open a proc table for update firstly
  instead of clearing the current binlog format.

Docs/sp-imp-spec.txt:
  New sql_mode added.
include/my_base.h:
  Flag in frm of create options.
libmysqld/CMakeLists.txt:
  New files added.
libmysqld/Makefile.am:
  New files added.
mysql-test/r/events_bugs.result:
  New sql_mode added.
mysql-test/r/information_schema.result:
  New sql_mode added.
mysql-test/r/sp.result:
  New sql_mode added.
mysql-test/r/system_mysql_db.result:
  New sql_mode added.
mysql-test/suite/funcs_1/r/is_columns_mysql.result:
  New sql_mode added.
mysql-test/suite/funcs_1/r/is_columns_mysql_embedded.result:
  New sql_mode added.
mysql-test/t/events_bugs.test:
  New sql_mode added.
mysql-test/t/sp.test:
  New sql_mode added.
scripts/mysql_system_tables.sql:
  New sql_mode added.
scripts/mysql_system_tables_fix.sql:
  New sql_mode added.
sql/CMakeLists.txt:
  New files added.
sql/Makefile.am:
  New files added.
sql/event_db_repository.cc:
  New sql_mode added.
sql/field.cc:
  Create options support added.
sql/field.h:
  Create options support added.
sql/ha_partition.cc:
  Create options support added.
sql/handler.cc:
  Create options support added.
sql/handler.h:
  Create options support added.
sql/log_event.h:
  New sql_mode added.
sql/mysql_priv.h:
  New sql_mode added.
sql/mysqld.cc:
  New sql_mode added.
sql/share/errmsg.txt:
  New error messages added.
sql/sp.cc:
  New sql_mode added.
sql/sp_head.cc:
  Create options support added.
sql/sql_class.cc:
  Create options support added.
  Debug added.
sql/sql_class.h:
  Create options support added.
sql/sql_insert.cc:
  my_safe_a* moved to mysqld_priv.h
sql/sql_lex.h:
  Create options support added.
sql/sql_parse.cc:
  Create options support added.
sql/sql_show.cc:
  Create options support added.
sql/sql_table.cc:
  Create options support added.
sql/sql_view.cc:
  New sql_mode added.
sql/sql_yacc.yy:
  Create options support added.
sql/structs.h:
  Create options support added.
sql/table.cc:
  Create options support added.
sql/table.h:
  Create options support added.
sql/unireg.cc:
  Create options support added.
storage/example/ha_example.cc:
  Create options example.
storage/example/ha_example.h:
  Create options example.
storage/pbxt/src/discover_xt.cc:
  Create options support added.

This patch:

- Moves all definitions from the mysql_priv.h file into
  header files for the component where the variable is
  defined
- Creates header files if the component lacks one
- Eliminates all include directives from mysql_priv.h
- Eliminates all circular include cycles
- Rename time.cc to sql_time.cc
- Rename mysql_priv.h to sql_priv.h

Deployed DBUG_ASSERT before the conditional binlog format
restore.

As part of BUG@39934 fix, the public:
 - THD::current_stmt_binlog_row_based 
variable had been removed and replaced by a private variable:
 - THD::current_stmt_binlog_format. 

THD was refactored and some modifiers and accessors were
implemented for the new variable.

However, due to a bad merge, the
THD::current_stmt_binlog_row_based variable is back as a public
member of THD. This in itself is already potentially
harmful. What's even worse is that while merging some more
patches and resolving conflicts, the variable started being used
again, which is obviously wrong.

To fix this we:
  1. remove the extraneous variable from sql_class.h
  2. revert a bad merge for BUG#49132
  3. merge BUG#49132 properly again (actually, making use of the
     cset used to merge the original patch to mysql-pe).

Cherry-pick a fix Bug#37148 from next-mr, to preserve
file ids of the added files, and ensure that all the necessary
changes have been pulled.

Since initially Bug#37148 was null-merged into 6.0,
the changeset that is now being cherry-picked was likewise
null merged into next-4284.

Now that Bug#37148 has been reapplied to 6.0, try to make
it work with next-4284. This is also necessary to be able
to pull other changes from 5.1-rep into next-4284.

To resolve the merge issues use this changeset applied
to 6.0:
revid:jperkin@sun.com-20091216103628-ylhqf7s6yegui2t9
revno: 3776.1.1
committer: He Zhenxing <zhenxing.he@sun.com>
branch nick: 6.0-codebase-bugfixing
timestamp: Thu 2009-12-17 17:02:50 +0800
message:
  Fix merge problem with Bug#37148

In RBR, DDL statement will change binlog format to non row-based
format before it is binlogged, but the binlog format was not be
restored, and then manipulating a temporary table can not reset binlog
format to row-based format rightly. So that the manipulated statement
is binlogged with statement-based format.

To fix the problem, restore the state of binlog format after the DDL
statement is binlogged.

mysql-test/extra/rpl_tests/rpl_tmp_table_and_DDL.test:
  Added the test file to verify if executing DDL statement before
  trying to manipulate a temporary table causes row-based replication
  to break with error 'table does not exist'.
mysql-test/suite/binlog/r/binlog_row_mix_innodb_myisam.result:
  Correct the test result, all the above binlog event
  should be row-based after the bug49132 is fixed IN RBR.
mysql-test/suite/ndb/r/ndb_tmp_table_and_DDL.result:
  Test result for bug#49132 base on ndb engine.
mysql-test/suite/ndb/t/ndb_tmp_table_and_DDL.test:
  Added the test file to verify if executing DDL statement before
  trying to manipulate a temporary table causes row-based replication
  to break with error 'table does not exist' base on ndb engine.
mysql-test/suite/rpl/r/rpl_tmp_table_and_DDL.result:
  Test result for bug#49132 base on myisam engine.
mysql-test/suite/rpl/t/rpl_tmp_table_and_DDL.test:
  Added the test file to verify if executing DDL statement before
  trying to manipulate a temporary table causes row-based replication
  to break with error 'table does not exist' base on myisam engine.
sql/event_db_repository.cc:
  Added code to restore the state of binlog format after the DDL
  statement is binlogged.
sql/events.cc:
  Added code to restore the state of binlog format after the DDL
  statement is binlogged.
sql/sp.cc:
  Added code to restore the state of binlog format after the DDL
  statement is binlogged.
sql/sql_acl.cc:
  Added code to restore the state of binlog format after the DDL
  statement is binlogged.
sql/sql_udf.cc:
  Added code to restore the state of binlog format after the DDL
  statement is binlogged.

condition variable per context instead of one mutex and one conditional
variable for the whole subsystem.

This should increase concurrency in this subsystem.

It also opens the way for further changes which are necessary to solve
such bugs as bug #46272 "MySQL 5.4.4, new MDL: unnecessary deadlock"
and bug #37346 "innodb does not detect deadlock between update and alter
table".

Two other notable changes done by this patch:

- MDL subsystem no longer implicitly acquires global intention exclusive
  metadata lock when per-object metadata lock is acquired. Now this has
  to be done by explicit calls outside of MDL subsystem.
- Instead of using separate MDL_context for opening system tables/tables
  for purposes of I_S we now create MDL savepoint in the main context
  before opening tables and rollback to this savepoint after closing
  them. This means that it is now possible to get ER_LOCK_DEADLOCK error
  even not inside a transaction. This might happen in unlikely case when
  one runs DDL on one of system tables while also running DDL on some
  other tables. Cases when this ER_LOCK_DEADLOCK error is not justified
  will be addressed by advanced deadlock detector for MDL subsystem which
  we plan to implement.

mysql-test/include/handler.inc:
  Adjusted handler_myisam.test and handler_innodb.test to the fact that
  exclusive metadata locks on tables are now acquired according to
  alphabetical order of fully qualified table names instead of order
  in which tables are mentioned in statement.
mysql-test/r/handler_innodb.result:
  Adjusted handler_myisam.test and handler_innodb.test to the fact that
  exclusive metadata locks on tables are now acquired according to
  alphabetical order of fully qualified table names instead of order
  in which tables are mentioned in statement.
mysql-test/r/handler_myisam.result:
  Adjusted handler_myisam.test and handler_innodb.test to the fact that
  exclusive metadata locks on tables are now acquired according to
  alphabetical order of fully qualified table names instead of order
  in which tables are mentioned in statement.
mysql-test/r/mdl_sync.result:
  Adjusted mdl_sync.test to the fact that exclusive metadata locks on
  tables are now acquired according to alphabetical order of fully
  qualified table names instead of order in which tables are mentioned
  in statement.
mysql-test/t/mdl_sync.test:
  Adjusted mdl_sync.test to the fact that exclusive metadata locks on
  tables are now acquired according to alphabetical order of fully
  qualified table names instead of order in which tables are mentioned
  in statement.
sql/events.cc:
  Instead of using separate MDL_context for opening system tables we now
  create MDL savepoint in the main context before opening such tables
  and rollback to this savepoint after closing them. To support this
  change methods of THD responsible for saving/restoring open table
  state were changed to use Open_tables_backup class which in addition
  to Open_table_state has a member for this savepoint. As result code
  opening/closing system tables was changed to use Open_tables_backup
  instead of Open_table_state class as well.
sql/ha_ndbcluster.cc:
  Since manipulations with open table state no longer install proxy
  MDL_context it does not make sense to perform them in order to
  satisfy assert in mysql_rm_tables_part2(). Removed them per agreement
  with Cluster team. This has not broken test suite since scenario in
  which deadlock can occur and assertion fails is not covered by tests.
sql/lock.cc:
  MDL subsystem no longer implicitly acquires global intention exclusive
  metadata lock when per-object exclusive metadata lock is acquired.
  Now this has to be done by explicit calls outside of MDL subsystem.
sql/log.cc:
  Instead of using separate MDL_context for opening system tables we now
  create MDL savepoint in the main context before opening such tables
  and rollback to this savepoint after closing them. To support this
  change methods of THD responsible for saving/restoring open table
  state were changed to use Open_tables_backup class which in addition
  to Open_table_state has a member for this savepoint. As result code
  opening/closing system tables was changed to use Open_tables_backup
  instead of Open_table_state class as well.
sql/mdl.cc:
  Changed metadata locking subsystem to use mutex per lock and condition
  variable per context instead of one mutex and one conditional variable
  for the whole subsystem.
  Changed approach to handling of global metadata locks. Instead of
  implicitly acquiring intention exclusive locks when user requests
  per-object upgradeable or exclusive locks now we require them to be
  acquired explicitly in the same way as ordinary metadata locks.
  In fact global lock are now ordinary metadata locks in new GLOBAL
  namespace.
  
  To implement these changes:
  - Removed LOCK_mdl mutex and COND_mdl condition variable.
  - Introduced MDL_lock::m_mutex mutexes which protect individual lock
    objects.
  - Replaced mdl_locks hash with MDL_map class, which has hash for
    MDL_lock objects as a member and separate mutex which protects this
    hash. Methods of this class allow to find(), find_or_create() or
    remove() MDL_lock objects in concurrency-friendly fashion (i.e.
    for most common operation, find_or_create(), we don't acquire
    MDL_lock::m_mutex while holding MDL_map::m_mutex. Thanks to MikaelR
    for this idea and benchmarks!). Added three auxiliary members to
    MDL_lock class (m_is_destroyed, m_ref_usage, m_ref_release) to
    support this concurrency-friendly behavior.
  - Introduced MDL_context::m_ctx_wakeup_cond condition variable to be
    used for waiting until this context's pending request can be
    satisfied or its thread has to perform actions to resolve potential
    deadlock. Context which want to wait add ticket corresponding to the
    request to an appropriate queue of waiters in MDL_lock object so
    they can be noticed when other contexts change state of lock and be
    awaken by them by signalling on MDL_context::m_ctx_wakeup_cond.
    As consequence MDL_ticket objects has to be used for any waiting
    in metadata locking subsystem including one which happens in
    MDL_context::wait_for_locks() method.
    Another consequence is that MDL_context is no longer copyable and
    can't be saved/restored when working with system tables.
  - Made MDL_lock an abstract class, which delegates specifying exact
    compatibility matrix to its descendants. Added MDL_global_lock child
    class for global lock (The old is_lock_type_compatible() method
    became can_grant_lock() method of this class). Added MDL_object_lock
    class to represent per-object lock (The old MDL_lock::can_grant_lock()
    became its method). Choice between two classes happens based on MDL
    namespace in MDL_lock::create() method.
  - Got rid of MDL_lock::type member as its meaning became ambigous for
    global locks.
  - To simplify waking up of contexts waiting for lock split waiting queue
    in MDL_lock class in two queues. One for pending requests for exclusive
    (including intention exclusive) locks and another for requests for
    shared locks.
  - Added virtual wake_up_waiters() method to MDL_lock, MDL_global_lock and
    MDL_object_lock classes which allows to wake up waiting contexts after
    state of lock changes. Replaced old duplicated code with calls to this
    method.
  - Adjusted MDL_context::try_acquire_shared_lock()/exclusive_lock()/
    global_shared_lock(), MDL_ticket::upgrade_shared_lock_to_exclusive_lock()
    and MDL_context::release_ticket() methods to use MDL_map and
    MDL_lock::m_mutex instead of single LOCK_mdl mutex and wake up
    waiters according to the approach described above. The latter method
    also was renamed to MDL_context::release_lock().
  - Changed MDL_context::try_acquire_shared_lock()/exclusive_lock() and
    release_lock() not to handle global locks. They are now supposed to
    be taken explicitly like ordinary metadata locks.
  - Added helper MDL_context::try_acquire_global_intention_exclusive_lock()
    and acquire_global_intention_exclusive_lock() methods.
  - Moved common code from MDL_context::acquire_global_shared_lock() and
    acquire_global_intention_exclusive_lock() to new method -
    MDL_context::acquire_lock_impl().
  - Moved common code from MDL_context::try_acquire_shared_lock(),
    try_acquire_global_intention_exclusive_lock()/exclusive_lock()
    to MDL_context::try_acquire_lock_impl().
  - Since acquiring of several exclusive locks can no longer happen under
    single LOCK_mdl mutex the approach to it had to be changed. Now we do
    it in one by one fashion. This is done in alphabetical order to avoid
    deadlocks. Changed MDL_context::acquire_exclusive_locks() accordingly
    (as part of this change moved code responsible for acquiring single
    exclusive lock to new MDL_context::acquire_exclusive_lock_impl()
    method).
  - Since we no longer have single LOCK_mdl mutex which protects all
    MDL_context::m_is_waiting_in_mdl members using these members to
    determine if we have really awaken context holding conflicting
    shared lock became inconvinient. Got rid of this member and changed
    notify_shared_lock() helper function and process of acquiring
    of/upgrading to exclusive lock not to rely on such information.
    Now in MDL_context::acquire_exclusive_lock_impl() and
    MDL_ticket::upgrade_shared_lock_to_exclusive_lock() we simply
    re-try to wake up threads holding conflicting shared locks after
    small time out.
  - Adjusted MDL_context::can_wait_lead_to_deadlock() and
    MDL_ticket::has_pending_conflicting_lock() to use per-lock
    mutexes instead of LOCK_mdl. To do this introduced
    MDL_lock::has_pending_exclusive_lock() method.
sql/mdl.h:
  Changed metadata locking subsystem to use mutex per lock and condition
  variable per context instead of one mutex and one conditional variable
  for the whole subsystem. In order to implement this change:
  
  - Added MDL_key::cmp() method to be able to sort MDL_key objects
    alphabetically. Changed length fields in MDL_key class to uint16
    as 16-bit is enough for length of any key.
  - Changed MDL_ticket::get_ctx() to return pointer to non-const
    object in order to be able to use MDL_context::awake() method
    for such contexts.
  - Got rid of unlocked versions of can_wait_lead_to_deadlock()/
    has_pending_conflicting_lock() methods in MDL_context and
    MDL_ticket. We no longer has single mutex which protects all
    locks. Thus one always has to use versions of these methods
    which acquire per-lock mutexes.
  - MDL_request_list type of list now counts its elements.
  - Added MDL_context::m_ctx_wakeup_cond condition variable to be used
    for waiting until this context's pending request can be satisfied
    or its thread has to perform actions to resolve potential deadlock.
    Added awake() method to wake up context from such wait.
    Addition of condition variable made MDL_context uncopyable.
    As result we no longer can save/restore MDL_context when working
    with system tables. Instead we create MDL savepoint before opening
    those tables and rollback to it once they are closed.
  - MDL_context::release_ticket() became release_lock() method.
  - Added auxiliary MDL_context::acquire_exclusive_lock_impl() method
    which does all necessary work to acquire exclusive lock on one object
    but should not be used directly as it does not enforce any asserts
    ensuring that no deadlocks are possible.
  - Since we no longer need to know if thread trying to acquire exclusive
    lock managed to wake up any threads having conflicting shared locks
    (as, anyway, we will try to wake up such threads again shortly)
  - MDL_context::m_is_waiting_in_mdl member became unnecessary and
    notify_shared_lock() no longer needs to be friend of MDL_context.
  
  Changed approach to handling of global metadata locks. Instead of
  implicitly acquiring intention exclusive locks when user requests
  per-object upgradeable or exclusive locks now we require them to be
  acquired explicitly in the same way as ordinary metadata locks.
  
  - Added new GLOBAL namespace for such locks.
  - Added new type of lock to be requested MDL_INTENTION_EXCLISIVE.
  - Added MDL_context::try_acquire_global_intention_exclusive_lock()
    and acquire_global_intention_exclusive_lock() methods.
  - Moved common code from MDL_context::acquire_global_shared_lock()
    and acquire_global_intention_exclusive_lock() to new method -
    MDL_context::acquire_lock_impl().
  - Moved common code from MDL_context::try_acquire_shared_lock(),
    try_acquire_global_intention_exclusive_lock()/exclusive_lock()
    to MDL_context::try_acquire_lock_impl().
  - Added helper MDL_context::is_global_lock_owner() method to be
    able easily to find what kind of global lock this context holds.
  - MDL_context::m_has_global_shared_lock became unnecessary as
    global read lock is now represented by ordinary ticket.
  - Removed assert in MDL_context::set_lt_or_ha_sentinel() which became
    false for cases when we execute LOCK TABLES under global read lock
    mode.
sql/mysql_priv.h:
  Instead of using separate MDL_context for opening system tables we now
  create MDL savepoint in the main context before opening such tables
  and rollback to this savepoint after closing them. To support this
  change methods of THD responsible for saving/restoring open table
  state were changed to use Open_tables_backup class which in addition
  to Open_table_state has a member for this savepoint. As result calls
  opening/closing system tables were changed to use Open_tables_backup
  instead of Open_table_state class as well.
sql/sp.cc:
  Instead of using separate MDL_context for opening system tables we now
  create MDL savepoint in the main context before opening such tables
  and rollback to this savepoint after closing them. To support this
  change methods of THD responsible for saving/restoring open table
  state were changed to use Open_tables_backup class which in addition
  to Open_table_state has a member for this savepoint. As result code
  opening/closing system tables was changed to use Open_tables_backup
  instead of Open_table_state class as well.
sql/sp.h:
  Instead of using separate MDL_context for opening system tables we now
  create MDL savepoint in the main context before opening such tables
  and rollback to this savepoint after closing them. To support this
  change methods of THD responsible for saving/restoring open table
  state were changed to use Open_tables_backup class which in addition
  to Open_table_state has a member for this savepoint. As result code
  opening/closing system tables was changed to use Open_tables_backup
  instead of Open_table_state class as well.
sql/sql_base.cc:
  close_thread_tables():
    Since we no longer use separate MDL_context for opening system
    tables we need to avoid releasing all transaction locks when
    closing system table. Releasing metadata lock on system table
    is now responsibility of THD::restore_backup_open_tables_state().
  open_table_get_mdl_lock(),
  Open_table_context::recover_from_failed_open():
    MDL subsystem no longer implicitly acquires global intention exclusive
    metadata lock when per-object upgradable or exclusive metadata lock is
    acquired. So this have to be done explicitly from these calls.
    Changed Open_table_context class to store MDL_request object for
    global intention exclusive lock acquired when opening tables.
  open_table():
    Do not release metadata lock if we have failed to open table as
    this lock might have been acquired by one of previous statements
    in transaction, and therefore should not be released.
  open_system_tables_for_read()/close_system_tables()/
  open_performance_schema_table():
    Instead of using separate MDL_context for opening system tables we now
    create MDL savepoint in the main context before opening such tables
    and rollback to this savepoint after closing them. To support this
    change methods of THD responsible for saving/restoring open table
    state were changed to use Open_tables_backup class which in addition
    to Open_table_state has a member for this savepoint. As result code
    opening/closing system tables was changed to use Open_tables_backup
    instead of Open_table_state class as well.
  close_performance_schema_table():
    Got rid of duplicated code.
sql/sql_class.cc:
  Instead of using separate MDL_context for opening system tables we now
  create MDL savepoint in the main context before opening such tables
  and rollback to this savepoint after closing them. To support this
  change methods of THD responsible for saving/restoring open table
  state were changed to use Open_tables_backup class which in addition
  to Open_table_state has a member for this savepoint. Also releasing
  metadata lock on system table is now responsibility of
  THD::restore_backup_open_tables_state().
  Adjusted assert in THD::cleanup() to take into account fact that now
  we also use MDL sentinel for global read lock.
sql/sql_class.h:
  Instead of using separate MDL_context for opening system tables we now
  create MDL savepoint in the main context before opening such tables
  and rollback to this savepoint after closing them. As result:
  - 'mdl_context' member was moved out of Open_tables_state to THD class.
    enter_locked_tables_mode()/leave_locked_tables_mode() had to follow.
  - Methods of THD responsible for saving/restoring open table state were
    changed to use Open_tables_backup class which in addition to
    Open_table_state has a member for this savepoint.
  Changed Open_table_context class to store MDL_request object for
  global intention exclusive lock acquired when opening tables.
sql/sql_delete.cc:
  MDL subsystem no longer implicitly acquires global intention exclusive
  metadata lock when per-object exclusive metadata lock is acquired.
  Now this has to be done by explicit calls outside of MDL subsystem.
sql/sql_help.cc:
  Instead of using separate MDL_context for opening system tables we now
  create MDL savepoint in the main context before opening such tables
  and rollback to this savepoint after closing them. To support this
  change methods of THD responsible for saving/restoring open table
  state were changed to use Open_tables_backup class which in addition
  to Open_table_state has a member for this savepoint. As result code
  opening/closing system tables was changed to use Open_tables_backup
  instead of Open_table_state class as well.
sql/sql_parse.cc:
  Adjusted assert reload_acl_and_cache() to the fact that global read
  lock now takes full-blown metadata lock.
sql/sql_plist.h:
  Added support for element counting to I_P_List list template.
  One can use policy classes to specify if such counting is needed
  or not needed for particular list.
sql/sql_show.cc:
  Instead of using separate MDL_context for opening tables for I_S
  purposes we now create MDL savepoint in the main context before
  opening tables and rollback to this savepoint after closing them.
  To support this and similar change for system tables methods of
  THD responsible for saving/restoring open table state were changed
  to use Open_tables_backup class which in addition to Open_table_state
  has a member for this savepoint. As result code opening/closing tables
  for I_S purposes was changed to use Open_tables_backup instead of
  Open_table_state class as well.
sql/sql_table.cc:
  mysql_rm_tables_part2():
    Since now global intention exclusive metadata lock is ordinary
    metadata lock we no longer can rely that by releasing MDL locks
    on all tables we will release all locks acquired by this routine.
    So in non-LOCK-TABLES mode we have to release all locks acquired
    explicitly.
  prepare_for_repair(), mysql_alter_table():
    MDL subsystem no longer implicitly acquires global intention
    exclusive metadata lock when per-object exclusive metadata lock
    is acquired. Now this has to be done by explicit calls outside of
    MDL subsystem.
sql/tztime.cc:
  Instead of using separate MDL_context for opening system tables we now
  create MDL savepoint in the main context before opening such tables
  and rollback to this savepoint after closing them. To support this
  change methods of THD responsible for saving/restoring open table
  state were changed to use Open_tables_backup class which in addition
  to Open_table_state has a member for this savepoint. As result code
  opening/closing system tables was changed to use Open_tables_backup
  instead of Open_table_state class as well.
  Also changed code not to use special mechanism for open system tables
  when it is not really necessary.

-WL#2822 INFORMATION_SCHEMA.ROUTINES: Add missing columns
-WL#2003 INFORMATION_SCHEMA: PARAMETERS view
-addon for 'I_S optimization' WL