pool->threads is freed before being reassigned the new pool.

Although not really a memory barrier I though it prudent to keep the pool
thread count to be the lower of the old/new thread list before the new threads
is allocated.

            fails in buildbot)

There was a race condition in timer functionality of query timeouts.

Race was as following:
main thread:          init_thr_timers()
timer handler thread: my_thread_init()
main thread:          end_thr_timer()/timer_thread_state= ABORTING
timer handler thread: timer_thread_state= RUNNING, continue normal op
main thread:          waits indefinitely for timer handler thread to go down

The original idea of the fix is to set RUNNING state in main thread, before
starting timer handler thread. But it didn't survive further cleanups:
- removed "timer_thread_state" and used "thr_timer_inited" for this purpose
- removed unused "timer_thread_running"
- removed code responisble for "timer handler thread" shutdown synchronization,
  use pthread_join() instead.

INFORMATION_SCHEMA.SYSTEM_VARIABLES.DEFAULT_VALUE had broken values on
big endian.

Default value is internally stored as longlong, while I_S references it's
pointer (longlong *) according to variable type (e.g. int, my_bool, etc). This
works well on little endian, but on big endian we always get 0 for such
variables.

This is temporal test fixt to avoid concurrent IST for now until
the actual issue https://github.com/codership/galera/issues/204
is fixed.

With commit 227510e0 (parser cleanup: don't store field properties in LEX,
use Create_field directly) it became possible to create columns DOUBLE(0,0) and alike

Added options for each compression type that can be disabled i.e.
bzip2, lz4, lzma and lzo.

* reset current_thd in THD::~THD, otherwise my_malloc_size_cb_func()
  might access THD after it was destroyed.
* remove now redundant set_current_thd(0) calls that follow delete thd.

This reverts commit 06c16904.

* error reporting was never needed
* avoid useless transformaton hton to db_type to hton
* in many cases the engine was guaranteed to exist, add asserts
* use ha_default_handlerton() instead of ha_checktype(DB_TYPE_DEFAULT)

but keep the code cleanup.
as it turns out, it didn't change the behavior, which is good :)

Now this works the same way as all other multi source variables.

Extend interface for 'show variables' with current scope

in case args[0] changes between PREPARE and EXECUTE

in particular, not the one that destructively changes Item's charset
(meaning different metadata for PREPARE and EXECUTE)

* fix the test to pass
* rearrange tests in a file to allow it to auto-merge in the future

use the old registry branch, even if we changed the "manufacturer" string

MDEV-7024: Assertion `! is_set()' failed in Diagnostics_area::set_eof_status on executing ANALYZE SELECT via PS

select_send::is_result_interceptor() should return FALSE because it return results to the client.

added a script to regenerate certificates easily in the future (2035!)
restored server8k-key.pem to actually be 8K key, as it was supposed to

MDEV-7023: Error 2027: Malformed packet and assertion `field_types == 0 || field_types[field_pos] == MYSQL_TYPE_INT24 || field_types[field_pos] == MYSQL_TYPE_LONG' failure in Protocol_text::store_long

The problem was that sp_head::MULTI_RESULTS was not set correctly for ANALYZE statement.

Backport from mysql 5.7. The patch reviewed, test added.

Merged revision 5224 from mysql-5.6 and added a test case.
..
revno: 5224
committer: Sergey Glukhov <sergey.glukhov@oracle.com>
branch nick: mysql-5.6
timestamp: Wed 2013-06-19 14:24:08 +0400
message:
    Bug#16620047 INCORRECT QUERY RESULT (AFTER SERVER UPGRADE)

MDEV-6668: Server crashes in check_view_single_update on concurrent DDL/DML flow with views and triggers

Call mysql_derived_reinit() if we are reusing view.
This is needed as during a previous error condition the view may not have been reset

sql/sql_derived.cc:
  More DBUG_PRINT
  Always reset merged_for_insert (no reason to not do that)
sql/sql_derived.h:
  Added prototype
sql/sql_insert.cc:
  More DBUG_PRINT
  Added DBUG_ASSERT
sql/sql_view.cc:
  Call mysql_derived_reinit() if we are reusing view.
  This is needed as during a previous error condition the view may not have been reset
sql/table.cc:
  More DBUG_PRINT