ha_release_auto_increment() must be done before F_UNLCK.
Non-atomic case is handled by select_insert::binlog_query().

MDEV-28933 added a condition to avoid keeping cached foreign keys when
renaming into temporary table. Such foreign keys must be freed.

make_tmp_name() creates temporary name with prefix containing PID and
TID. This prefix influences max length of the rest of the name (the
whole name is limited by NAME_LEN). During the test run PID and TID
can change. PID increases when the server restarts. TID is incremented
with the new connections (generated by next_thread_id(), is not the
posix thread ID).

During the test run PID can increase max 2 decimal positions: from
tens to thousands this requires ~900 restarts. TID depends on
connection count, but for test we assume it will not trespass 100000
connections which is 5 decimal positions. So it should be enough to
reserve 7 characters for PID and TID increment.

The patch reserves more: it reserves 12 characters for 7-decimal PID
and 5-decimal TID plus 4 chars of additional reserve (for future
prefix changes) and assumes minimal legth of the prefix is 30 bytes:

#sql-backup-PID-TID-
#sql-create-PID-TID-

4-6-PID-TID- is 10 + 4 + PID + TID, so PID + TID is 16 chars (7 + 5 + 4).

Usually when we get into finalize_locked_tables() with error
m_locked_tables_count was not decremented. m_locked_tables_count is
decremented when we drop the original table and if we failed that
m_locked_tables_count is expected intact.

The bug comes from the fact that finalize_atomic_replace() violates
the above contract. It does HA_EXTRA_PREPARE_FOR_DROP and decrements
m_locked_tables_count. Then it tries rename_table_and_triggers() and
fails. With decremented m_locked_tables_count reopen_tables() does
nothing and we don't get new value for pos_in_locked_tables->table.

The test case demonstrates ER_ERROR_ON_RENAME where non-atomic CREATE
OR REPLACE would not fail. The original RENAME TABLE fails under such
broken environment, so nothing is wrong with atomic CREATE OR REPLACE
failing there too.

mysqlslap has an unusual semantics of the --iterations option, so that
$ mysqlslap --concurrency=16 --iterations=1000
performs 16,000 connections. Because of that it gets many times slower
with --ssl

Let's disable ssl for mysqlslap in mysql-test

Problem:
=======
Test Case 4 sporadically failed upon waiting for the slave to start during
master demotion to slave, due to a GTID event not existing in the new
master's binlog. If by chance the original slave (new master) did not yet
receive all the binlog events, then this failure could occur.

Solution:
========
Sync slave with master GTID  before master demotion.

Reviewed By:
============
Brandon Nesterenko <brandon.nesterenko@mariadb.com>

The benefit of this is that one can remove the READ ONLY ADMIN privilege
from all users and this way ensure that no one can do any changes on
any non-temporary tables.

This is good option to use on slaves when one wants to ensure that the
slave is kept identical to the master.

Update the result of a ./mtr --ps-protocol test

The test is unstable because 'UPDATE t SET b = 100' latches a page and
waits for 'upd_cont' signal in lock_trx_handle_wait_enter sync point, then
purge requests RW_X_LATCH on the same page, and then 'SELECT * FROM t
WHERE a = 10 FOR UPDATE' requests RW_S_LATCH, waiting for RW_X_LATCH
requested by purge. 'UPDATE t SET b = 100' can't release page latch as
it waits for upd_cont signal, which must be emitted after 'SELECT * FROM
t WHERE a = 10 FOR UPDATE' acquired RW_S_LATCH. So we have a deadlock,
which is resolved by finishing the debug sync point wait by timeout, and
the 'UPDATE t SET b = 100' releases it's record locks rolling back the
transaction, and 'SELECT * FROM t WHERE a = 10 FOR UPDATE' is finished
successfully instead of finishing by lock wait timeout.

The fix is to forbid purging during the test by opening read view in a
separate connection before the first insert into the table.

Besides, 'lock_wait_end' syncpoint is not needed, as it enough to wait
the end of the SELECT execution to let the UPDATE to continue.

* MDEV-29426 Fix memory leak in CONNECT JSON/BSON

If information is being gathered on JSON/BSON tables we leak the heap
allocated to the table class. With this fix we close and cleanup
instead, just as we do for XML tables.

The reason why mysql/mysql-server@8020cfac20c55a870a874446870d5e90bdc181ed
split the files was some unit tests that never existed in the
MariaDB Server code base. The storage/innobase/unittest/ works just fine
with this file.

This is reverting part of 2e814d47
which applied InnoDB changes from MySQL 5.7.9.

The futex system calls were introduced in Linux 2.6.0,
which was released in December 2003. It should be safe to assume
that the system calls are always available on the Linux kernels
that MariaDB Server 10.3 would run on.

There should be no point to disable branch prediction hints or prefetch.

Let us use the normal platform-specific preprocessor symbols
__linux__, __sun__, _AIX instead of some homebrew ones.

The preprocessor symbol UNIV_HPUX must have lost its meaning
by f6deb00a (note: the symbol
UNIV_HPUX10 is being checked for, but only UNIV_HPUX is defined).

log_phys_t::apply(): When parsing an INSERT_HEAP_DYNAMIC record,
allow ll==rlen to hold for the last part. A secondary index record
may inherit all preceding bytes from the infimum pseudo-record.

For INSERT_HEAP_REDUNDANT, some header bytes will always be present
because the header will never be copied from the page infimum.
We will tolerate ll==rlen also in that case to be consistent with
the parsing of INSERT_HEAP_DYNAMIC.

Thanks to Thirunarayanan Balathandayuthapani for spotting this.

recv_scan_log(): Do not dereference the first byte of the log record
before recv_sys.parse_pmem() (or recv_sys_t::parse_mtr()) returns OK.

In the case of the failure that was analyzed, we had
recv_sys.offset == recv_sys.len and recv_sys_t::parse_mtr() would return
PREMATURE_EOF. This would lead us to reading more data and parsing again.

When a memory-mapped interface to the log is being used, that is,
log_sys.is_pmem() holds, recv_sys.offset cannot point past the
end of the memory-mapped log_sys.buf[]. This is guaranteed by
log_sys.calc_lsn_offset().

Thanks to Nayuta Yanagisawa for providing a core dump for analysis.

To make it possible to update the HELP text of UPDATE without
changing this test every time, the test is changed to look
for a faked help topic. A non-existant help topic generates
different metadata and wasn't suitable as a test.

Requested by Ian Gilfillan.

Reviewed by Dmitry Shulga