MDEV-6656: Test wsrep.variables hangs

  Analysis: wsrep_applier_thread shutdown signaling does not always work
  correctly causing a timing problem where main thread is waiting in a
  condition variable a signal that all worker threads to end.

option.

    Merged lp:maria/maria-10.0-galera up to revision 3880.

    Added a new functions to handler API to forcefully abort_transaction,
    producing fake_trx_id, get_checkpoint and set_checkpoint for XA. These
    were added for future possiblity to add more storage engines that
    could use galera replication.

Merged lp:maria/maria-10.0-galera up to revision 3879.

Added a new functions to handler API to forcefully abort_transaction,
producing fake_trx_id, get_checkpoint and set_checkpoint for XA. These
were added for future possiblity to add more storage engines that
could use galera replication.

Added a new functions to handler API to forcefully abort_transaction,
producing fake_trx_id, get_checkpoint and set_checkpoint for XA. These
were added for future possiblity to add more storage engines that
could use galera replication.

Reverted workaround for gcc bug, which was fixed 3 years ago:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34772

3871..3879.

IS [NOT] NULL predicate is sargable within an outer join. Range
analysis only uses predicates from ON expressions, which have
regular semantics (without null-complemented rows, etc).
There is no reason not use IS [NOT] NULL predicates.

Discover P_S tables automatically.

Most of this patch is code clean-up:
- removed tests and code responsible for P_S tables correctness verification
- always return error from ha_perfschema::create()
- install/upgrade scripts won't create P_S tables anymore

ALGORITHM=INPLACE for InnoDB

Added thd_progress calls to row_merge_sort to give
some hint how merge sort progresses.

- After PREPARE is done, save the value of thd->select_number
  (this is what will be assigned to next select_lex object)
- Restore the value at each execution of the prepared statement.

Removed raw debug output when no error on OS operation has not happened.

mysqldump:
- Added --log-queries to allow one to disable logging for the dump

sql/log_event.cc:
- Removed setting of enable_slow_log as it's not required anymore.

sql/sql_parse.cc:
- Set enable_slow_log to value of thd->variables.sql_log_slow as this will speed up tests if slow log is disabled.
- opt_log_slow_admin_statements can now only disable slow log, not enable it.

sql/sql_explain.cc:
- Minor cleanup

Other things:
- Added sql_log_slow to system variables.
- Changed opt_slow_log to global_system_variables.sql_log_slow in all files
- Updated tests to reflect changes

Removed -DSECURITY_HARDENED=OFF for debug build scripts
ignore configure

Analysis: Provided incorrect parameter to output buffer size
and incorrectly determined actual payload size after compression.

implementation.

Merged lp:maria/maria-10.0-galera up to revision 3867.

    Merge https://github.com/kakao/mariadb-10.0 that contains Facebook's
    implementation for defragmentation

    facebook/mysql-5.6@a2d3a74
    facebook/mysql-5.6@def96c8
    facebook/mysql-5.6@9c67c5d
    facebook/mysql-5.6@921a81b
    facebook/mysql-5.6@aa519bd
    facebook/mysql-5.6@fea7d13
    facebook/mysql-5.6@09b29d3
    facebook/mysql-5.6@9284abb
    facebook/mysql-5.6@dbd623d
    facebook/mysql-5.6@aed55dc
    facebook/mysql-5.6@aad5c82

    This version does not add new SQL-syntax and new handler API function.
    Instead optimize table is mapped to defragment table if
    innodb_defragment=ON, by default the feature is off.

    Contains changes authored by Sunguck Lee (Kakao).

buf0buf.cc line 2642.

Analysis: innodb_compression_algorithm is a global variable and
can change while we are building page compressed page. This could
lead page corruption.

Fix: Cache innodb_compression_algorithm on local variable before
doing any compression or page formating to avoid concurrent
change. Improved page verification on debug builds.

Analysis: InnoDB writes also files that do not contain FIL-header.
This could lead incorrect analysis on os_fil_read_func function
when it tries to see is page page compressed based on FIL_PAGE_TYPE
field on FIL-header. With bad luck uncompressed page that does
not contain FIL-headed, the byte on FIL_PAGE_TYPE position could
indicate that page is page comrpessed.

Fix: Upper layer must indicate is file space page compressed
or not. If this is not yet known, we need to read the FIL-header
and find it out. Files that we know that are not page compressed
we can always just provide FALSE.