Replaced hash with lock-free hash.

Extended lf-hash implementation to accept user defined hash function.

Added initializer callback to lf-hash. Needed to initialize properly non-POD
types.

Simplified MDL_object_lock and MDL_scoped_lock dichotomy so that they can be
stored in LF_HASH. This was done by moving out their differences to a
MDL_lock_strategy structure which is referenced from the MDL_lock object by
pointer.

Replaced m_ref_usage, m_ref_release, m_is_destroyed and m_version with single
m_state, which is updated atomically. Needed to get rid of MDL_map::m_mutex.

Removed MDL map partitions. Won't be needed when this MDEV is implemented.

Removed MDL objects cache. Won't be needed when this MDEV is implemented.

Based on the patch by Sriram Patil, made under terms of GSoC 2014.

of very similar copies of my_well_formed_len_xxx(), implemented
for big5, cp932, euckr, eucjpms, gb2312m gbk, sjis, ujis.

adjust suppression rules after warning message format change

Adding a new virtual function MY_CHARSET_HANDLER::copy_abort().
Moving character set specific code into the correspoding implementations
(for simple, multi-byte and mbmaxlen>1 character sets).

error messages.

* remove useless suppressions from the test file, when a plugin doesn't
  load, the file isn't executed anyway
* add the suppression to mysql-test-run.pl instead

Take into account that PIE binaries are loaded at some offset, so
addresses cannot be directly resolved with addr2line. Find this
offset and subtract it before resolving an address.

MDEV-7000 Assertion `0' failed in Protocol::end_statement() on executing DDL under innodb_fake_changes=1

correct the if() condition to match the behavior of the old code
that this if() was supposed to replace

There were two issues:

* set_var_default_role::user was overwritten with a new value,
  allocated in the thd->mem_root, which is reset between executions.
  That was causing the crash. Solved by introducing set_var_default_role::real_user

* when privilege tables were opened on EXECUTE, the reprepare_observer
  would abort the statement (as privilege tables are opened using
  the local TABLE_LIST that doesn't preserve metadata from PREPARE, so
  reprepare_observer thought they're changed). This issue also applied
  to SET PASSWORD. Solved by disabling reprepare_observer.

Added logic to sort gtid list based on domain_id before
populating them in string. Added a test case.

Removed 'galera-sst-mode' option from mysqldump and added logic
in wsrep_sst_mysqldump script to retrieve gtid_binlog_state from
donor node and send it to the joiner node.

Added an include file to check galera library version.

* Changed loopback detection to be done via ifa->ifa_flags
* Removed unused function wsrep_guess_address()

by adding a new class String_copier.

This is a pre-requisite patch for MDEV-6566 and MDEV-6572,
to avoid adding more similar code.

Create_tmp_table was called incorrectly called in
select_materialized_with_stats::create_result_table, having keep_row_order
passed for the do_not_open parameter and keep_row_order always set to false.

file_key_management_plugin is used

Fixed error handling and added disabling InnoDB redo log encryption
if encryption key management plugin is not there.

- Remove the compiler warning, add assert statements.
- make select_describe() not call mysql_explain_union() for
  views that were "merged for INSERT".

file_key_management_plugin is used

Fixed error handling and added disabling InnoDB redo log encryption
if encryption key management plugin is not there.

of encryption/compression pages and that will happen if and only
if dirty pages are written to the disk.

    MDEV-7399: Add support for INFORMATION_SCHEMA.INNODB_MUTEXES
    MDEV-7618: Improve semaphore instrumentation

    Introduced two new information schema tables to monitor mutex waits
    and semaphore waits. Added a new configuration variable
    innodb_intrument_semaphores to add thread_id, file name and
    line of current holder of mutex/rw_lock.

Added support for compression method snappy for page compression.

Changed wsrep plugin from mysql_plugin to maria_plugin to
set up plugin_maturity to Stable.

encrypted tables

Introduced a new innodb_default_page_encryption_key configuration
variable to allow user to set the default key identifier.