(because it's conceptually wrong. only the user can decide whether the kill is
allowed to leave tables in the inconsistent state, storage engine has no say in that)

The previous fix for MDEV-3992 was incomplete, because it still computed
incorrectly the number of keyparts of the extended secondary key in the
case when columns of the PK participate in the secondary key.

This patch by Monty corrects the above problem.

Analysis:
  The crash is a result of incorrect analysis of whether a secondary key
  can be extended with a primary in order to compute ORDER BY. The analysis
  is done in test_if_order_by_key(). This function doesn't take into account
  that the primary key may in fact index the same columns as the secondary
  key. For the test query test_if_order_by_key says that there is an extended
  key with total 2 keyparts.
  At the same time, the condition
    if (pkinfo->key_part[i].field->key_start.is_set(nr))
  in test_if_cheaper_oredring() becomes true for (i == 0), which results in
  an invalid access to rec_per_key[-1].
  
Solution:
  The best solution would be to reuse KEY::ext_key_parts that is already computed
  by open_binary_frm(), however after detailed analysis the conclusion is that
  the change would be too intrusive for a GA release.
  The solution for 5.5 is to add a guard for the case when the 0-th key part is
  considered, and to assume that all keys will be scanned in this case.

- Added --verbose to BUILD scripts to get make to write out compile commands.
- Detect if AM_EXTRA_MAKEFLAGS=VERBOSE=1 was used with build scripts.
- Don't write warnings about replication variables when doing bootstrap.
- Fixed that mysql_cond_wait() and mysql_cond_timedwait() will report original source file in case of errors.
- Ignore some compiler warnings

BUILD/FINISH.sh:
  Detect if AM_EXTRA_MAKEFLAGS=VERBOSE=1 or --verbose was used
BUILD/SETUP.sh:
  Added --verbose to print out the full compile lines
  Updated help message
client/mysqltest.cc:
  Fixed that one can use 'replace' with cat_file
cmake/configure.pl:
  If --verbose is used, get make to write out compile commands
debian/dist/Debian/rules:
  Added $AM_EXTRA_MAKEFLAGS to get VERBOSE=1 on buildbot builds
debian/dist/Ubuntu/rules:
  Added $AM_EXTRA_MAKEFLAGS to get VERBOSE=1 on buildbot builds
include/my_pthread.h:
  Made set_timespec_time_nsec() more portable.
include/mysql/psi/mysql_thread.h:
  Fixed that mysql_cond_wait() and mysql_cond_timedwait() will report original source file in case of errors.
mysql-test/suite/innodb/r/auto_increment_dup.result:
  Fixed wrong DBUG_SYNC
mysql-test/suite/innodb/t/auto_increment_dup.test:
  Fixed wrong DBUG_SYNC
mysql-test/suite/perfschema/include/upgrade_check.inc:
  Make test more portable for changes in *.sql files
mysql-test/suite/perfschema/r/pfs_upgrade.result:
  Updated test results
mysql-test/valgrind.supp:
  Ignore running Aria checkpoint thread
scripts/mysqlaccess.sh:
  Changed reference of bugs database
  Ensure that also client-server group is read.
sql/handler.cc:
  Added missing syncpoint
sql/mysqld.cc:
  Don't write warnings about replication variables when doing bootstrap
sql/mysqld.h:
  Don't write warnings about replication variables when doing bootstrap
sql/rpl_rli.cc:
  Don't write warnings about replication variables when doing bootstrap
sql/sql_insert.cc:
  Don't mask SERVER_SHUTDOWN in insert_delayed
  This is done to be able to distingush between shutdown and interrupt errors
support-files/compiler_warnings.supp:
  Ignore some compiler warnings in xtradb,innobase, oqgraph, yassl, string3.h

Fixed MDEV-4002: Server crash or valgrind errors in Item_func_group_concat::setup and Item_func_group_concat::add

mysql-test/r/group_by.result:
  Added test case for failing GROUP_CONCAT ... ROLLUP queries
mysql-test/t/group_by.test:
  Added test case for failing GROUP_CONCAT ... ROLLUP queries
sql/item_sum.cc:
  Fixed issue where field->table pointed to different temporary table than expected.
  Ensure that order->next points to the right object (could cause problems with setup_order())

Moved out creation of performance schema tables from mysql_system_tables.sql as
the performance_tables creation scripts needs a working mysql.proc to work.

client/mysql_upgrade.c:
  Added option -V, --version
debian/dist/Debian/mariadb-server-5.5.files:
  Added mysql_performance_tables.sql
debian/dist/Ubuntu/mariadb-server-5.5.files:
  Added mysql_performance_tables.sql
mysql-test/lib/v1/mysql-test-run.pl:
  Added mysql_performance_tables.sql
mysql-test/mysql-test-run.pl:
  Added mysql_performance_tables.sql
scripts/CMakeLists.txt:
  Moved out creation of performance schema tables from mysql_system_tables.sql 
  as the performance_tables creation scripts needs a working mysql.proc to work
scripts/mysql_install_db.sh:
  Added mysql_performance_tables.sql
scripts/mysql_performance_tables.sql:
  Moved out creation of performance schema tables from mysql_system_tables.sql 
  as the performance_tables creation scripts needs a working mysql.proc to work
scripts/mysql_system_tables.sql:
  Move creation of performance schema tables to mysql_performance_tables.sql
  Added 'flush tables' to get things to work if someone deletes a table like mysql.proc before run
scripts/mysql_system_tables_fix.sql:
  ove performance table things to mysql_performance_tables.sql
storage/perfschema/pfs.cc:
  Fixed comment

Give error for wrong parameters to CHANGE MASTER
Extend MASTER_PASSWORD and MASTER_HOST lengths


mysql-test/suite/rpl/r/rpl_password_boundaries.result:
  Test length of MASTER_PASSWORD, MASTER_HOST and MASTER_USER
mysql-test/suite/rpl/r/rpl_semi_sync.result:
  Use different password than user name for better test coverage
mysql-test/suite/rpl/t/rpl_password_boundaries.test:
  Test length of MASTER_PASSWORD, MASTER_HOST and MASTER_USER
mysql-test/suite/rpl/t/rpl_semi_sync.test:
  Use different password than user name for better test coverage
sql/rpl_mi.h:
  Extend MASTER_PASSWORD and MASTER_HOST lengths
sql/sql_repl.cc:
  Give error for wrong parameters to CHANGE MASTER
sql/sql_repl.h:
  Extend MASTER_PASSWORD and MASTER_HOST lengths

KILL now breaks locks inside InnoDB
Fixed possible deadlock when running INNODB STATUS
Added ha_kill_query() and kill_query() to send kill signal to all storage engines
Added reset_killed() to ensure we don't reset killed state while awake() is getting called


include/mysql/plugin.h:
  Added thd_mark_as_hard_kill()
include/mysql/plugin_audit.h.pp:
  Added thd_mark_as_hard_kill()
include/mysql/plugin_auth.h.pp:
  Added thd_mark_as_hard_kill()
include/mysql/plugin_ftparser.h.pp:
  Added thd_mark_as_hard_kill()
sql/handler.cc:
  Added ha_kill_query() to send kill signal to all storage engines
sql/handler.h:
  Added ha_kill_query() and kill_query() to send kill signal to all storage engines
sql/log_event.cc:
  Use reset_killed()
sql/mdl.cc:
  use thd->killed instead of thd_killed() to abort on soft kill
sql/sp_rcontext.cc:
  Use reset_killed()
sql/sql_class.cc:
  Fixed possible deadlock in INNODB STATUS by not getting thd->LOCK_thd_data if it's locked.
  Use reset_killed()
  Tell storge engines that KILL has been sent
sql/sql_class.h:
  Added reset_killed() to ensure we don't reset killed state while awake() is getting called.
  Added mark_as_hard_kill()
sql/sql_insert.cc:
  Use reset_killed()
sql/sql_parse.cc:
  Simplify detection of killed queries.
  Use reset_killed()
sql/sql_select.cc:
  Use reset_killed()
sql/sql_union.cc:
  Use reset_killed()
storage/innobase/handler/ha_innodb.cc:
  Added innobase_kill_query()
  Fixed error reporting for interrupted queries.
storage/xtradb/handler/ha_innodb.cc:
  Added innobase_kill_query()
  Fixed error reporting for interrupted queries.

Fix for MDEV-4009: main.delayed sporadically fails with "query 'REPLACE DELAYED t1 VALUES (5)' failed: 1317: Query execution was interrupted"
- Fixed broadcast without a proper mutex
- Don't break existing locks if we are just testing if we can get the lock

mysql-test/r/create_delayed.result:
  Added test case for failures with INSERT DELAYED with CREATE and DROP TABLE
mysql-test/t/create_delayed.test:
  Added test case for failures with INSERT DELAYED with CREATE and DROP TABLE
sql/mdl.cc:
  Don't break existing locks for timeout=0 (ie, just check if there are conflicting locks).
  This fixed the bug that INSERT DELAYED didn't work properly with CREATE TABLE
sql/sql_base.cc:
  One neads to hold the mutex before doing a mysql_cond_broadcast()
  This fixed the bug that INSERT DELAYED didn't work properly with DROP TABLE
sql/sql_insert.cc:
  Protect setting of mysys_var->current_mutex.

MDEV-3942 FROM_DAYS(<timestamp column>) returns different result in MariaDB comparing to MySQL: NULL vs 0000-00-00

fixed a regression, introduced while fixing MDEV-456

MDEV-3987 uninitialized read in Item_cond::fix_fields leads to crash: select .. where .. in ( select ... )

change Item_func_group_concat to use max_length according to the expected semantics

Remove timed mutexes in XtraDB - obsolete feature that does not link on Windows, if plugin is build dynamically
It was already  removed from innobase in the past.

Reasons:
  - as of 5.5.27, YEAR(2) is deprecated, hence the new warning;
  - MDEV-553 - different error code/message on out-of-range autoincrement;
  - INSERT IGNORE now produces a warning if a duplicate was encountered

storage_engine tests and upstream engines/* suites went out of sync with current MariaDB code. Reasons:
  - as of 5.5.27, YEAR(2) is deprecated, hence the new warning;
  - MDEV-553 - different error code/message on out-of-range autoincrement;
  - INSERT IGNORE now produces a warning if a duplicate was encountered (change pushed along with MDEV-553)

from a MERGE view.

The problem was in the lost ability to be null for the table of a left join if it
is a view/derived table.

It hapenned because setup_table_map(), was called earlier then we merged
the view or derived.

Fixed by propagating new maybe_null flag during Item::update_used_tables().

Change in join_outer.test and join_outer_jcl6.test appeared because
IS NULL reported no used tables (i.e. constant) for argument which could not be
NULL and new maybe_null flag was propagated for IS NULL argument (Item_field)
because table the Item_field belonged to changed its maybe_null status.

MDEV-3928: Assertion `example' failed in Item_cache::is_expensive_processor with a 2-level IN subquery

Analysis:
The following call stack shows that it is possible to set Item_cache::value_cached, and the relevant value
without setting Item_cache::example.

#0 Item_cache_temporal::store_packed at item.cc:8395
#1 get_datetime_value at item_cmpfunc.cc:915
#2 resolve_const_item at item.cc:7987
#3 propagate_cond_constants at sql_select.cc:12264
#4 propagate_cond_constants at sql_select.cc:12227
#5 optimize_cond at sql_select.cc:13026
#6 JOIN::optimize at sql_select.cc:1016
#7 st_select_lex::optimize_unflattened_subqueries at sql_lex.cc:3161
#8 JOIN::optimize_unflattened_subqueries at opt_subselect.cc:4880
#9 JOIN::optimize at sql_select.cc:1554

The fix is to set Item_cache_temporal::example even when the value is
set directly by Item_cache_temporal::store_packed. This makes the
Item_cache_temporal object consistent.

Using too long table aliases in stored routines might
have caused server crashes.

Code in sp_head::merge_table_list() which is responsible
for collecting information about tables used in stored
routine was not aware of the fact that table alias might
have arbitrary length. I.e. it assumed that table alias
can't be longer than NAME_LEN bytes and allocated buffer
for a key identifying table accordingly.

This patch fixes the issue by ensuring that we use
dynamically allocated buffer for table key when table
alias is too long. By default stack based buffer is used
in which NAME_LEN bytes are reserved for table alias.

No commit message

taking a change done to main 5.1 by Dmitri Lenev.

This is the original comment:

> committer: Dmitry Lenev <Dmitry.Lenev@oracle.com>
> branch nick: mysql-5.1-15954896
> timestamp: Wed 2012-12-05 19:26:56 +0400
> message:
>   Bug #15954896 "SP, MULTI-TABLE DELETE AND LONG ALIAS".

  Using too long table aliases in stored routines might
  have caused server crashes.

  Code in sp_head::merge_table_list() which is responsible
  for collecting information about tables used in stored
  routine was not aware of the fact that table alias might
  have arbitrary length. I.e. it assumed that table alias
  can't be longer than NAME_LEN bytes and allocated buffer
  for a key identifying table accordingly.

  This patch fixes the issue by ensuring that we use
  dynamically allocated buffer for table key when table
  alias is too long. By default stack based buffer is used
  in which NAME_LEN bytes are reserved for table alias.

then for 5.5.28a it should be
5.5.28a-mariadb1~wheezy not 5.5.28-mariadb-a1~wheezy

MDEV-3902  Assertion `record_length == m_record_length' failed at Filesort_buffer::alloc_sort_buffer

This bug is a duplicate of mdev-3899 so adding a test case only.

  
The patch decreases the duration of LOCK_thread_count, so it is not hold during THD destructor and freeing memory.
This mutex  now only protects the integrity of threads list, when removing THD from it,  and thread_count variable.
  
The add_to_status() function that updates global status during client disconnect,  is now correctly protected by the LOCK_status mutex.

Benchmark : in a  "non-persistent" sysbench test (oltp_ro with reconnect after each query),  ~ 25% more connects/disconnects were measured