The problem was that select_gtid_pos_table() was called by IO thread
without mutex protection.

This is to get core's in mysql-test-run if server doesn't die in shutdown

- Added inline lex_string_cmp() to replace my_strcase_cmp().
- Added inline lex_string_eq to first compares lengths before comparing strings

WSREP_LOG increased the stack size of all function, where it was used,
with 1024 bytes, even if it would never called. What's worse is that one
a Mac with Lion 10.7, the stack size was increased with 1024* number of
calls per function.

By moving WSREP_LOG() to a function, the stack size on Lion in function
mysql_execute() was reduced from 18K to 12K. On my main Linux machine
with gcc 5.4 the reduction was from 5k to 4k.

Before this patch running full mtr generated some 70 cores (at least
on systemd). Now no cores should be generated.

- Changed DBUG_ABORT()'s used by mysql-test-run to DBUG_SUICIDE()
- Changed DBUG_ABORT() used to crash server with core to DBUG_ASSERT(0)
- DBUG_ASSERT now flushes DBUG files

The old behavior of returning the affected rows for the last statement
in a stored procedure was more an accident than design. Having the number
of affected rows for all sub statements is more useful and will not change
just because on changes the order of statements in the stored procedure.

- Changed also a few ;; to ;

This fixes MDEV-7742 and MDEV-8305 (Allow user to specify if stored
procedures should be logged in the slow and general log)

New functionality:
- Added new variables log_slow_disable_statements and log_disable_statements
  that can be used to disable logging of certain queries to slow and
  general log. Currently supported options are 'admin', 'call', 'slave'
  and 'sp'.
  Defaults are as before. Only 'sp' (stored procedure statements) is
  disabled for  slow and general_log.
- Slow log to files now includes the following new information:
  - When logging stored procedure statements the name of stored
    procedure is logged.
  - Number of created tmp_tables, tmp_disk_tables and the space used
    by temporary tables.
- When logging 'call', the logged status now contains the sum of all
  included statements.  Before only 'time' was correct.
- Added filsort_priority_queue as an option for log_slow_filter (this
  variable existed before, but was not exposed)
- Added support for BIT types in my_getopt()

Mapped some old variables to bitmaps (old variables can still be used)
- Variable 'log_queries_not_using_indexes' is mapped to
  log_slow_filter='not_using_index'
- Variable 'log_slow_slave_statements' is mapped to
  log_slow_disabled_statements='slave'
- Variable 'log_slow_admin_statements' is mapped to
  log_slow_disabled_statements='admin'
- All the above variables are changed to session variables from global
  variables

Other things:
- Simplified LOGGER::log_command. We don't need to check for super if
  OPTION_LOG_OFF is set as this flag can only be set if one is a super
  user.
- Removed some setting of enable_slow_log as it's guaranteed to be set by
  mysql_parse()
- mysql_admin_table() now sets thd->enable_slow_log
- Added prepare_logs_for_admin_command() to reset thd->enable_slow_log if
  needed.
- Added new functions to store, restore and add slow query status
- Added new functions to store and restore query start time
- Reorganized Sub_statement_state according to types
- Added code in dispatch_command() to ensure that
  thd->reset_for_next_command() is always called for a query.
- Added thd->last_sql_command to simplify checking of what was the type
  of the last command. Needed when logging to slow log as lex->sql_command
  may have changed before slow logging is called.
- Moved QPLAN_TMP_... to where status for tmp tables are updated
- Added new THD variable, affected_rows, to be able to correctly log
  number of affected rows to slow log.

If compiling a non DBUG binary with
-DDBUG_ASSERT_AS_PRINTF asserts will be
changed to printf + stack trace (of stack
trace are enabled).

- Changed #ifndef DBUG_OFF to
  #ifdef DBUG_ASSERT_EXISTS
  for those DBUG_OFF that was just used to enable
  assert
- Assert checking that could greatly impact
  performance where changed to DBUG_ASSERT_SLOW which
  is not affected by DBUG_ASSERT_AS_PRINTF
- Added one extra option to my_print_stacktrace() to
  get more silent in case of stack trace printing as
  part of assert.

The mutex is needed to ensure that sql thread should not not miss the error
signal.

- Simplified use_trans_cache() to return at once if is_transactional is set
- Indentation and spelling errors fixed
- Don't call signal_update() if update_binlog_end_pos() is called as the
  function already calls signal_update()
- Removed not used function wait_for_update_bin_log(), which would cause
  errors if ever used.
- Simplified handler::clone() by always allocating 'ref' in ha_open(). To do
  this I added an optional MEM_ROOT argument to ha_open() to be used when
  allocating 'ref'
- Changed arguments to get_system_var() from LEX_CSTRING to LEX_CSTRING*
- Added THD as argument to create_select_for_variable(). Changed also char*
  argument to LEX_CSTRING to avoid strlen() call.
- Change calls to append() to use LEX_CSTRING

- Now we have same thread_id in general log, slow long and error log
  instead of a long meaningless thread number that may even change for
  one user.
- Align error and slow log header with output
- Extend thread_id with one number to handle nice printing up to ten
  million connections

- Added TABLE_SHARE->not_usable_by_query_cache
- Moved TABLE->no_replicate to TABLE_SHARE->no_replicate as it's same for
  all TABLE instances
- Renamed TABLE_SHARE->cached_row_logging_check to can_do_row_logging

- Moved declaration of Sql_alloc from Sql_list.h as they are independent
  structures.

this partially reverts 6e56ebbb498

* update cracklib_password_check to match the new prototype
* cannot use __attribute__((format)) for my_snprintf, because
  we support format extensions that the compiler doesn't know about.

- Added sql/mariadb.h file that should be included first by files in sql
  directory, if sql_plugin.h is not used (sql_plugin.h adds SHOW variables
  that must be done before my_global.h is included)
- Removed a lot of include my_global.h from include files
- Removed include's of some files that my_global.h automatically includes
- Removed duplicated include's of my_sys.h
- Replaced include my_config.h with my_global.h

- Use microsecond_interval_timer() to calculate time for applying row events.
  (Faster execution)
- Removed return value for set_row_stmt_start_timestamp()
  as it was never used.

Don't use the server's version, that expects a valid THD.
Modify net_serv.cc not not use any THD if MYSQL_SERVER isn't defined.

This reverts commit aaddac5c.

accept proxy protocol header from client connections.
The new server variable 'proxy_protocol_networks' contains list
of networks from which proxy header is accepted.

platform independent.

It allows to push conditions into derived with window functions not
only in the cases when the window specifications of these window
functions use the same partition, but also in the cases when the window
functions use partitions that share only some fields. In these
cases only the conditions over the common fields are pushed.