When "simulate_failed_connection_1"  DBUG keyword is set, current thread's
DBUG stack points to global variable in dbug (init_settings).
This global variable could be overriden while current THD is still active,
producing crash in worst scenario.

Added DBUG_SET()so that the current thread own dbug
context that cannot concurrently modified by anyone else.

Follow-up to
Bug#21141390: REMOVE UNUSED FUNCTIONS AND CONVERT GLOBAL SYMBOLS TO STATIC
but for variables instead of functions.

Was identified with the -Wmissing-variable-declarations
compiler warning option supported by Clang 3.6.
Reviewed-by: Marko Mäkelä <marko.makela@oracle.com>

RB: 9070

InnoDB defines some functions that are not called at all.
Other functions are called, but only from the same compilation unit.

Remove some function declarations and definitions, and add 'static'
keywords. Some symbols must be kept for separately compiled tools,
such as innochecksum.

Also, remove empty .ic files that were not removed by my MySQL commit.

Problem:
InnoDB used to support a compilation mode that allowed to choose
whether the function definitions in .ic files are to be inlined or not.
This stopped making sense when InnoDB moved to C++ in MySQL 5.6
(and ha_innodb.cc started to #include .ic files), and more so in
MySQL 5.7 when inline methods and functions were introduced
in .h files.

Solution:
Remove all references to UNIV_NONINL and UNIV_MUST_NOT_INLINE from
all files, assuming that the symbols are never defined.
Remove the files fut0fut.cc and ut0byte.cc which only mattered when
UNIV_NONINL was defined.

until the protocol changes for bulk are finalized.

This is a partial port of my patch in MySQL 8.0.
In MySQL 8.0, all InnoDB references to DBUG_OFF were replaced
with UNIV_DEBUG. We will not do that in MariaDB.

InnoDB used two independent compile-time flags that distinguish
debug and non-debug builds, which is confusing.

Also, make ut_ad() and alias of DBUG_ASSERT().

In the InnoDB internal SQL parser, there is the keyword
DOES_NOT_FIT_IN_MEMORY that is never specified in any CREATE TABLE
statement that is passed to the InnoDB SQL parser
(que_eval_sql() or pars_sql() or yyparse()). If this keyword were
ever present, it would set the flag dict_table_t::does_not_fit_in_memory
which is only present in debug builds.

Let us remove all traces of this.

Also, fix storage/innobase/pars/make_flex.sh so that no the generated
file storage/innobase/pars/lexyy.cc works as is.

FIXME: Always generate the InnoDB Bison files at build time, similar
to how sql/sql_yacc.yy is handled. (This would still leave the
generated scanner files, unless we want to add a build-time dependency
for Flex.)

The fix is about filling the space beyond the end of VARCHAR values with zeroes.
VARCHAR NULLs already has its buffer filled with zeros. So when the VARCHAR fields
are not NULL, then we explicitly fill the buffer with zeros.

Added conditions so that the WITH queries are also added to the query cache

fix proposed by Diego

dict_create_or_check_foreign_constraint_tables(): Change the warning
about the foreign key metadata table creation to a note.

Remove messages after metadata table creation. If the creation fails,
startup will abort with a message. Normally the creation succeeds on
bootstrap, and the messages would only be noise.

Remove the related suppressions from the tests.

        Now let's check JSON length to fit the max_allowed packet.

        In get_mm_tree we have to change Field_geom::geom_type to
        GEOMETRY as we have to let storing all types of the spatial features
        in the field. So now we restore the original geom_type as it's
        done.

character (").

        The my_wildcmp function doesn't expect the string parameter to
        have escapements, only the template. So the string
        should be unescaped if necessary.

MDEV-10140: Add support for EXCEPT

row_purge_remove_sec_if_poss_leaf(): Add a debug assertion.

row_purge_parse_undo_rec(): Add a debug assertion that the table cannot
be a temporary table. Remove a dead condition.

- add PAGESIZE property to the MSI installer
- add combobox  to the MSI UI to select innodb page size
- add new parameter --innodb_page_size for mysql_install_db.exe.
this is passed down to bootstrap and also stored in my.ini.

MSI will call mysql_install_db.exe with --innodb_page_size set to the
PAGESIZE property

fixed C++ comment in C code

Starting with MySQL 5.7, temporary tables in InnoDB are handled
differently from persistent tables. Because temporary tables are
private to a connection, concurrency control and multi-versioning
(MVCC) are not applicable. For performance reasons, purge is
disabled as well. Rollback is supported for temporary tables;
that is why we have the temporary undo logs in the first place.

Because MVCC and purge are disabled for temporary tables, we should
discard all temporary undo logs already at transaction commit,
just like we discard the persistent insert_undo logs. Before this
change, update_undo logs were being preserved.

trx_temp_undo_t: A wrapper for temporary undo logs, comprising
a rollback segment and a single temporary undo log.

trx_rsegs_t::m_noredo: Use trx_temp_undo_t.
(Instead of insert_undo, update_undo, there will be a single undo.)

trx_is_noredo_rseg_updated(), trx_is_rseg_assigned(): Remove.

trx_undo_add_page(): Remove the parameter undo_ptr.
Acquire and release the rollback segment mutex inside the function.

trx_undo_free_last_page(): Remove the parameter trx.

trx_undo_truncate_end(): Remove the parameter trx, and add the
parameter is_temp. Clean up the code a bit.

trx_undo_assign_undo(): Split the parameter undo_ptr into rseg, undo.

trx_undo_commit_cleanup(): Renamed from trx_undo_insert_cleanup().
Replace the parameter undo_ptr with undo.
This will discard the temporary undo or insert_undo log at
commit/rollback.

trx_purge_add_update_undo_to_history(), trx_undo_update_cleanup():
Remove 3 parameters. Always operate on the persistent update_undo.

trx_serialise(): Renamed from trx_serialisation_number_get().

trx_write_serialisation_history(): Simplify the code flow.
If there are no persistent changes, do not update MONITOR_TRX_COMMIT_UNDO.

trx_commit_in_memory(): Simplify the logic, and add assertions.

trx_undo_page_report_modify(): Keep a direct reference to the
persistent update_undo log.

trx_undo_report_row_operation(): Simplify some code.
Always assign TRX_UNDO_INSERT for temporary undo logs.

trx_prepare_low(): Keep only one parameter. Prepare all 3 undo logs.

trx_roll_try_truncate(): Remove the parameter undo_ptr.
Try to truncate all 3 undo logs of the transaction.

trx_roll_pop_top_rec_of_trx_low(): Remove.

trx_roll_pop_top_rec_of_trx(): Remove the redundant parameter
trx->roll_limit. Clear roll_limit when exhausting the undo logs.
Consider all 3 undo logs at once, prioritizing the persistent
undo logs.

row_undo(): Minor cleanup. Let trx_roll_pop_top_rec_of_trx()
reset the trx->roll_limit.

In the 10.1 InnoDB Plugin, a call os_event_free(buf_flush_event) was
misplaced. The event could be triggered by rollback of resurrected
transactions while shutdown was in progress. This bug was caught
by cmake -DWITH_ASAN testing. This call was only present in the
10.1 InnoDB Plugin, not in other versions, or in XtraDB.

That said, the bug affects all InnoDB versions. Shutdown assumes the
cessation of any page-dirtying activity, including the activity of
the background rollback thread. InnoDB only waited for the background
rollback to finish as part of a slow shutdown (innodb_fast_shutdown=0).
The default is a clean shutdown (innodb_fast_shutdown=1). In a scenario
where InnoDB is killed, restarted, and shut down soon enough, the data
files could become corrupted.

logs_empty_and_mark_files_at_shutdown(): Wait for the
rollback to finish, except if innodb_fast_shutdown=2
(crash-like shutdown) was requested.

trx_rollback_or_clean_recovered(): Before choosing the next
recovered transaction to roll back, terminate early if non-slow
shutdown was initiated. Roll back everything on slow shutdown
(innodb_fast_shutdown=0).

srv_innodb_monitor_mutex: Declare as static, because the mutex
is only used within one module.

In 10.2, os_event_destroy() sets the event to a NULL pointer,
while os_event_free() in earlier versions did not do that.

os_sync_free(), which hid resource leaks, was removed in MySQL 5.7.

Take into acount result of open table operation in mysql_admin_table.

It appeared during a merge from 10.2 to bb-10.2-ext.

Compatibility links ended up looking like this:
libmysqlclient.so.18 -> /tmp/buildd/mariadb-10.2-10.2.0/debian/tmp/usr/lib/i386-linux-gnu/libmariadb.so.3

This change fixes ln syntax to create links with correct target paths.

Reason : after running sysbench tests (rw,update_no_index), in all cases
the throughout was considerably (approx 15%) better with the patch removed.

Reverted commit info
commit 8dc03bee3ade2edcc53a3a257346f4a0a9f0b44c
Author: Yasufumi Kinoshita <yasufumi.kinoshita@oracle.com>
Date:   Wed Nov 20 17:02:24 2013 +0900

Bug #17824101 : WL#7050 CAUSES RW PERFORMANCE REGRESSION AT SOME WINDOWS ENVIRONMENT

InnoDB undo logs currently always use the innodb_page_size,
whether they are stored in the system tablespace, in a
dedicated undo tablespace, or in the temporary tablespace.
Remove redundant page_size parameters.

TrxUndoRsegsIterator::set_next(): return bool instead of page_size.