When we move data we should fix buffer string length

under LOCK TABLES we still have to open everything, otherwise DML
prelocking will try to take an MDL on a table that wasn't in the
LOCK TABLES list.

only MDL-prelock but do not open FK child tables for read-only (RESTRICT)
FK actions.

Tables still needs to be opened for CASCADE actions, see 9180e866

We must ensure that the NUL will not terminate the query string.

Replace the 30-second sleep in the test with proper
DEBUG_SYNC interlocking.

MDEV-21437 MariaDB's SUSE/SLES packages don't "provide" all of the same capabilities as the platform's default packages

commit d467bb7e accidentally
broke the build without WSREP, by misplacing an #endif.

This is a partial backport of
commit 5e7e7153 from 10.4.

assert_trx_is_free(): Assert !is_wsrep().

trx_init(): Do not initialize trx->wsrep, because it must have been
initialized already.

trx_commit_in_memory(): Invoke wsrep_commit_ordered(). This call
was being skipped, because the transaction object had already been
freed to the pool.

trx_rollback_for_mysql(), innobase_commit_low(),
innobase_rollback_trx(): Always reset trx->wsrep.

		FOREIGN_KEY_CHECKS is disabled

- Referenced index can be null While renaming the referenced column name.
In that case, rename the referenced column name in dict_foreign_t and
find the equivalent referenced index.

queues.c cleanup and refactoring.

Restore old version of _downhead() (from before cd483c55)
that works well in an average case. Use it for queue_fix().

Move existing specialized version of _downhead() to queue_replace()
where it'll be handling the case it was specifically optimized for
(moving the element to the end of the queue).
And correct it to fix the heap not only down, but also up
(this fixes BUG#30301356).

Add unit tests.

Collateral cosmetic fixes.

CONCAT_WS didn't have it

DESCRIPTION:
============
There can be issues if the packets sent by the server
are not proper. Certain checks should be performed at the
client side while unpacking fields data.

FIX:
====
Check for the appropriate fields data and error out if it
is not present.

RB: 23601

The event scheduler has a THD which is used for e.g. keeping track
of the timing of the events. Thus, each scheduling of an event will
make use of this THD, which in turn allocates memory in the THD's
mem root. However, the mem root was never cleared, and hence, the
memory occupied would monotonically increase throughout the life
time of the server.

The root cause was found by Jon Olav Hauglid, and this fix clears the
THD's mem root for each event being scheduled.

Change-Id: I462d2b9fd9658c9f33ab5080f7cd0e0ea28382df

in fact, in MariaDB it cannot, but it can show spurious slaves
in SHOW SLAVE HOSTS.

slave was registered in COM_REGISTER_SLAVE and un-registered after
COM_BINLOG_DUMP. If there was no COM_BINLOG_DUMP, it would never
unregister.

Fix mtr error:

Bareword "HAVE_WIN32_CONSOLE" not allowed while "strict subs" in use at mysql-test-run.pl line 387.
Execution of mysql-test-run.pl aborted due to compilation errors.

Added in e3f5789a

Also fix the link to unicode.org repo, it is now on github.

Port this functionality from to Windows.
It requires Win32::Console module, which is already included into
Strawberry perl

This is a way do disable DBUG_ENTER()/DBUG_EXIT() stuff which is
needed to dbug trace. Those who doesn't need it may avoid tests
slowdown with -DWITH_DBUG_TRACE=OFF

dbug/tests.c: add define which is neede always in this test

innodb.log_file_name_debug.test: do not depend on DBUG trace stuff
in test

Benchmark results: each test eats less CPU and you can have more
parallel jobs in MTR.

patched:
./mtr -mem -par=8 -suite=innodb  185.34s user 86.85s system 133% cpu 3:23.27 total
./mtr -mem -par=8 -suite=main    80.96s  user 36.01s system 182% cpu 1:04.07 total

main.select                              [ pass ]   1660
main.select                              [ pass ]   1513
main.select                              [ pass ]   1543
main.select                              [ pass ]   1660
main.select                              [ pass ]   1521
main.select                              [ pass ]   1511
main.select                              [ pass ]   1508
main.select                              [ pass ]   1520
main.select                              [ pass ]   1514
main.select                              [ pass ]   1522

vanilla:
./mtr -mem -par=8 -suite=innodb  203.61s user 92.16s system 140% cpu 3:30.16 total
./mtr -mem -par=8 -suite=main    94.11s  user 35.51s system 206% cpu 1:02.69 total

main.select                              [ pass ]   2032
main.select                              [ pass ]   2017
main.select                              [ pass ]   2040
main.select                              [ pass ]   2183
main.select                              [ pass ]   2253
main.select                              [ pass ]   2075
main.select                              [ pass ]   2109
main.select                              [ pass ]   2080
main.select                              [ pass ]   2098
main.select                              [ pass ]   2114

Add wait_condition to make sure that node contains all the rows
expected.

test case

Cause:
In case of version based condtional comments, if the condition evaluates
to false, it is converted to a regular comment for replication by
replacing "!"  by " ".

Nested comment in a conditional comment is replicated as is. Nested
comments are supported only in case of conditional comments and when a
the comment on slave is no more a conditional comment, the statement
execution fails on the slave.

Fix:
Convert the nested comment, start from "/*" to "(*" and comment end from
"*/" to "*)" for replication.

Change-Id: I1a8e385a267b2370529eade094f0258fa96886c0