Clean up and improve the parallel implementation code, mainly related to
scheduling of work to threads and handling of stop and errors.

Fix a lot of bugs in various corner cases that could lead to crashes or
corruption.

Fix that a single replication domain could easily grab all worker threads and
stall all other domains; now a configuration variable
--slave-domain-parallel-threads allows to limit the number of
workers.

Allow next event group to start as soon as previous group begins the commit
phase (as opposed to when it ends it); this allows multiple event groups on
the slave to participate in group commit, even when no other opportunities for
parallelism are available.

Various fixes:

 - Fix some races in the rpl.rpl_parallel test case.

 - Fix an old incorrect assertion in Log_event iocache read.

 - Fix repeated malloc/free of wait_for_commit and rpl_group_info objects.

 - Simplify wait_for_commit wakeup logic.

 - Fix one case in queue_for_group_commit() where killing one thread would
   fail to correctly signal the error to the next, causing loss of the
   transaction after slave restart.

 - Fix leaking of pthreads (and their allocated stack) due to missing
   PTHREAD_CREATE_DETACHED attribute.

 - Fix how one batch of group-committed transactions wait for the previous
   batch before starting to execute themselves. The old code had a very
   complex scheduling where the first transaction was handled differently,
   with subtle bugs in corner cases. Now each event group is always scheduled
   for a new worker (in a round-robin fashion amongst available workers).
   Keep a count of how many transactions have started to commit, and wait for
   that counter to reach the appropriate value.

 - Fix slave stop to wait for all workers to actually complete processing;
   before, the wait was for update of last_committed_sub_id, which happens a
   bit earlier, and could leave worker threads potentially accessing bits of
   the replication state that is no longer valid after slave stop.

 - Fix a couple of places where the test suite would kill a thread waiting
   inside enter_cond() in connection with debug_sync; debug_sync + kill can
   crash in rare cases due to a race with mysys_var_current_mutex in this
   case.

 - Fix some corner cases where we had enter_cond() but no exit_cond().

 - Fix that we could get failure in wait_for_prior_commit() but forget to flag
   the error with my_error().

 - Fix slave stop (both for normal stop and stop due to error). Now, at stop
   we pick a specific safe point (in terms of event groups executed) and make
   sure that all event groups before that point are executed to completion,
   and that no event group after start executing; this ensures a safe place to
   restart replication, even for non-transactional stuff/DDL. In error stop,
   make sure that all prior event groups are allowed to execute to completion,
   and that any later event groups that have started are rolled back, if
   possible. The old code could leave eg. T1 and T3 committed but T2 not, or
   it could even leave half a transaction not rolled back in some random
   worker, which would cause big problems when that worker was later reused
   after slave restart.

 - Fix the accounting of amount of events queued for one worker. Before, the
   amount was reduced immediately as soon as the events were dequeued (which
   happens all at once); this allowed twice the amount of events to be queued
   in memory for each single worker, which is not what users would expect.

 - Fix that an error set during execution of one event was sometimes not
   cleared before executing the next, causing problems with the error
   reporting.

 - Fix incorrect handling of thd->killed in worker threads.

Removed repetative calls of virtual functions.
Removed check of posibility just copy field for every record.

Ported fix for MySQL BUG#51861.

As part of the fix we don't anymore generate a create table statement when doing a
CREATE TABLE IF NOT EXISTS table_that_exist LiKE temporary_table
if the 'table_that_exist' existed.

This is because it's not self evident if we should generate a create statement
matching the existing table or the temporary_table. 
The old code generated a table like the existing table in row based replication and like the temporary table
in statement based replication.
It's better to ensure that both cases works the same way.

mysql-test/suite/rpl/r/rpl_row_create_table.result:
  Updated results
  (Now we don't anymore CREATE TABLE IF NOT EXISTS LIKE if the table existed)
sql/sql_base.cc:
  More DBUG_PRINT
sql/sql_error.cc:
  More DBUG_PRINT
sql/sql_table.cc:
  Don't generate a create table statement when doing a
  CREATE TABLE IF NOT EXISTS table_that_exist like temporary_table if the table existed.

This is port of fix for MySQL BUG#17647863.

revno: 5572
revision-id: jon.hauglid@oracle.com-20131030232243-b0pw98oy72uka2sj
committer: Jon Olav Hauglid <jon.hauglid@oracle.com>
timestamp: Thu 2013-10-31 00:22:43 +0100
message:
  Bug#17647863: MYSQL DOES NOT COMPILE ON OSX 10.9 GM

  Rename test() macro to MY_TEST() to avoid conflict with libc++.

Replaced LOCK_flush with per-share conditional variable.

Move TABLE::in_use out of LOCK_open.

This is done with assumtion that foreign threads accessing TABLE::in_use
will only need consistent value _after_ marking table for flush and purging
unused table instances. In this case TABLE::in_use will always point to a
valid thread object.

Previously FLUSH TABLES thread may wait for tables flushed subsequently by
concurrent threads which breaks the above assumption, e.g.:
open tables: t1 (version= 1)
thr1 (FLUSH TABLES): refresh_version++
thr1 (FLUSH TABLES): purge table cache
open tables: none
thr2 (SELECT * FROM t1): open tables: t1
open tables: t1 (version= 2)
thr2 (FLUSH TABLES): refresh_version++
thr2 (FLUSH TABLES): purge table cache
thr1 (FLUSH TABLES): wait for old tables (including t1 with version 2)

It is fixed so that FLUSH TABLES waits only for tables that were open
heretofore.

Lock-free tc_count.

mysql-test/r/rpl_mysqldump_slave.result:
  Updated test result

When running with multi-source enabled master (MariaDB 10.0) all master will be recorded

mysql-test/r/rpl_mysqldump_slave.result:
  Updated results to new syntax

Fixed MDEV-3815: Aria engine return "The table is full" (ERROR 1114) inserting record, while MyISAM and InnoDB doesn't

Increase default pointer length for Aria tables to be able to handle big files without having to specify MAX_ROWS


mysql-test/suite/maria/icp.result:
  Updated result
mysql-test/suite/maria/maria-preload.result:
  More pages are needed with longer pointer length
mysql-test/suite/maria/maria.result:
  Added more tests
mysql-test/suite/maria/maria.test:
  Added more tests
storage/maria/ma_create.c:
  Increase default pointer length for Aria tables to be able to handle big files without having to specify MAX_ROWS
storage/maria/ma_range.c:
  Optimize records_in_range() to be more exact
storage/maria/ma_static.c:
  Increase default pointer size
storage/maria/ma_test2.c:
  Allow a bit larger errors in records_in_range

As a side-effect of purge_relay_logs(), sql_slave_skip_counter
was silently ignored in GTID mode.

But sql_slave_skip_counter in fact is not a good match with GTID.
And it is not really needed either, as users can explicitly set
@@gtid_slave_pos to skip specific GTIDs, in a way that matches
well how GTID replication works.

So with this patch, we give an error on attempts to set
sql_slave_skip_counter when using GTID, with a suggestion to use
gtid_slave_pos instead, if needed.

    MDEV-4984: Implement MASTER_GTID_WAIT() and @@LAST_GTID.
    MDEV-4726: Race in mysql-test/suite/rpl/t/rpl_gtid_stop_start.test
    MDEV-5636: Deadlock in RESET MASTER

Fix a race in test case rpl_gtid_basic.
include/sync_with_master_gtid.inc got confused due to two different
GTIDs both with the same seq_no=9.

The problem is a deadlock between MYSQL_BIN_LOG::reset_logs() and
MYSQL_BIN_LOG::mark_xid_done(). The former takes LOCK_log and waits for the
latter to complete. But the latter also tries to take LOCK_log; this can lead
to a deadlock.

There was already code that tries to deal with this, with the flag
reset_master_pending. However, there was still a small opportunity for
deadlock, when an previous mark_xid_done() is still running when reset_logs()
is called and is at the precise point where it first releases LOCK_xid_list
and then re-aquires both LOCK_log and LOCK_xid_list.

Solve by setting reset_master_pending in reset_logs() before taking
LOCK_log. And also count how many invocations of LOCK_xid_list are in the
progress of releasing and re-aquiring locks, and in reset_logs() wait for that
number to drop to zero after setting reset_master_pending and before taking
LOCK_log.

Rewrite the gtid_waiting::wait_for_gtid() function.
The code was rubbish (and buggy). Now the logic is
much clearer.

Also fix a missing slave sync that could cause test failure.

Couple of small fixes following buildbot testing.

Some GTID test cases were using include/wait_condition.inc with a
condition like SELECT COUNT(*)=4 FROM t1 to wait for the slave to
catch up with the master. This causes races and test failures, as the
changes to the tables become visible at the COMMIT of the SQL thread
(or even before in case of MyISAM), but the changes to
@@gtid_slave_pos only become visible a little bit after the COMMIT.

Now that we have MASTER_GTID_WAIT(), just use that to sync up in a
GTID-friendly way, wrapped in nice include/save_master_gtid.inc and
include/sync_with_master_gtid.inc scripts.

MASTER_GTID_WAIT() is similar to MASTER_POS_WAIT(), but works with a
GTID position rather than an old-style filename/offset.

@@LAST_GTID gives the GTID assigned to the last transaction written
into the binlog.

Together, the two can be used by applications to obtain the GTID of
an update on the master, and then do a MASTER_GTID_WAIT() for that
position on any read slave where it is important to get results that
are caught up with the master at least to the point of the update.

The implementation of MASTER_GTID_WAIT() is implemented in a way
that tries to minimise the performance impact on the SQL threads,
even in the presense of many waiters on single GTID positions (as
from @@LAST_GTID).

(as it was done for spider suite)

MDEV-4439 ALTER TABLE .. [ADD|DROP] FOREIGN KEY IF [NOT] EXISTS does not work if constraint name is not used.
  Patches for server and the Innodb engine.
  Server is fixed so it does nothing if no indexes left to alter.
  Innodb parser is fixed so it looks for the IF [NOT] EXISTS option in a string.
  Another change is that it uses the index name for the internal dictionary.
  Prior to that it only used the CONSTRAINT name for it.

mysql-test/r/lowercase_table2.result:
  Updated result
  (The change happend because we don't try to open the table anymore as part of create table)
mysql-test/suite/rpl/r/create_or_replace_mix.result:
  Fixed result file
mysql-test/suite/rpl/r/create_or_replace_row.result:
  Fixed result file
mysql-test/suite/rpl/r/create_or_replace_statement.result:
  Fixed result file
mysql-test/suite/rpl/t/create_or_replace.inc:
  Drop open temporary table
mysys/my_delete.c:
  Added missing newline
plugin/metadata_lock_info/mysql-test/metadata_lock_info/r/user_lock.result:
  Fixed result
  (Lock names was before off by one. Was corrected by my previous patch)
sql/sql_select.cc:
  Fixed compiler warnings by adding missing casts
storage/connect/ha_connect.cc:
  Fixed compiler warnings
storage/innobase/os/os0file.cc:
  Fixed compiler warnings
storage/xtradb/btr/btr0btr.cc:
  Fixed compiler warnings
storage/xtradb/handler/ha_innodb.cc:
  removed not used function
strings/ctype-uca.c:
  Fixed compiler warnings
support-files/compiler_warnings.supp:
  Added suppression for warnings that are wrong or are not serious andthat we don't plan to fix.