The issue here is the wrong estimate of the cardinality of a partial join,
the cardinality is too high because the function table_cond_selectivity()
returns an absurd number 100 while selectivity cannot be greater than 1.

When accessing table t by outer reference t1.a via index we do not perform any
range analysis for t. Yet we see TABLE::quick_key_parts[key] and
TABLE->quick_rows[key] contain a non-zero value though these should have been
remained untouched and equal to 0.

Thus real cause of the problem is that TABLE::init does not clean the arrays
TABLE::quick_key_parts[] and TABLE::>quick_rows[].
It should have done it because the TABLE structure created for any
instance of a table can be reused for many queries.

InnoDB: Assertion failure in file .../dict/dict0dict.cc line ...
InnoDB: Failing assertion: table->can_be_evicted

This fixes a regression that was caused by the fix of MDEV-20621
(commit a41d4297).
MySQL 5.6 (and MariaDB 10.0) introduced eviction of tables from
the InnoDB data dictionary cache. Tables that are connected to
FOREIGN KEY constraints or FULLTEXT INDEX are exempt of the eviction.
With the problematic change, a table that would already be exempt
from eviction due to FOREIGN KEY would cause the problem if there
also was a FULLTEXT INDEX defined on it.

dict_load_table(): Only prevent eviction if table->can_be_evicted holds.

Do not rely on existence of CMakeFiles/${target}.dir directory existence
It is not there for custom targets in Ninja build.

Don't save/restore HP_INFO as it could be changed by a concurrent thread.
different parts of HP_INFO are protected by different mutexes and
the mutex that protect most of the HP_INFO does not protect its open_list
data.

As a bonus, make heap_check_heap() to take const HP_INFO* and not
make any changes there whatsoever.

dict_table_rename_in_cache(): Use strcpy() instead of strncpy(),
because they are known to be equivalent in this case (the length
of old_name was already validated).

mariabackup: Invoke strncpy() with one less than the buffer size,
and explicitly add NUL as the last byte of the buffer.

Do the same that newer branches do and don't include glibc-related headers on non-glibc environment.

In the function prev_record_reads where one finds the different row combinations for a
subset of partial join, it did not take into account the selectivity of tables
involved in the subset of partial join.

Unfortunate DROP TEMPORARY..IF EXISTS on a regular table may allow
subsequent CREATE TABLE statements to steal away the PFS_table_share
instance from the dropped table.

In commit d1e6b0bc
some code was supposed to be modified, but instead
it got duplicated. Remove the duplicated copy.

* use compile_time_assert instead of DBUG_ASSERT

* don't use thd->clear_error(), because
  * the error was already consumed by the error handler, so there is
     nothing to clear
  * it's dangerous to clear errors indiscriminately, if the error came
    from outside of read_statistics_for_tables() it must not be cleared

mysql_insert() first opens all affected tables (which implicitly
starts a transaction in InnoDB), then stat tables.
A failure to open a stat table caused open_tables() to abort
the current stmt transaction (trans_rollback_stmt()). So, from the
server point of view the following ha_write_row()-s happened outside
of a transactions, and the server didn't bother to commit them.

The server has a mechanism to prevent a transaction being
unexpectedly committed or rolled back in the middle of a statement -
if an operation takes place _in a sub-statement_ it cannot change
the transaction state. Operations on stat tables are exactly that -
they are not allowed to change a transaction state. Put them in
a sub-statement to make sure they don't.

following Fedora recommendations (see %systemd_post macro in FC29)
let's do `systemctl preset` on the first installation of the server

This reverts commit 396313d3.

Apply the changes to InnoDB and XtraDB that had been
inadvertently skipped in the merge
commit ae476868

That merge failure sabotaged part of MDEV-20127:
>Revert a problematic auto_increment_increment 'fix' from 2014.
>This involves replacing the MDEV-8827 fix and in 10.1,
>removing some WSREP instrumentation.

The code changes were re-merged manually by executing the following:

 # Get the parent of the problematic merge.
git checkout ae476868^
 # Perform the merge again.
git merge ae476868^2
 # Get the conflict resolution from that merge.
git checkout ae476868 .
 # Note: Any changes to these files were removed (empty diff)!
git diff HEAD storage/{innobase,xtradb}/handler/ha_innodb.cc
 # Apply the code changes:
git diff cf403934^2..MERGE_HEAD \
storage/{innobase,xtradb}/handler/ha_innodb.cc|
patch -p1

Basicaly it's an uninitialized read. 165 is 0xa5 which comes from TRASH_ALLOC()

Fix by calling a class ctor which initializes problematic
TMP_TABLE_PARAM::force_copy_fields field

In debug build, whenever MEMORY table instance gets closed it performs
consistency check without protection. It may cause server crash if
executed concurrently with DML.

Moved consistency check to ha_heap::external_lock(F_UNLCK), so that it
is protected by THR_LOCK.

Ever since MariaDB 10.0 (and MySQL 5.6.8), the innodb_log_file_size
and innodb_log_files_in_group can be changed between server restarts,
and the redo log files will be resized on server startup if needed.

- fts_optimize_thread() uses dict_table_t object instead of table id.
So that it doesn't acquire dict_sys->mutex. It leads to remove the
hang of dict_sys->mutex between fts_optimize_thread() and other threads.

- in_queue to indicate whether the table is in fts_optimize_queue. It
is protected by fts_optimize_wq->mutex to avoid any race condition.

- fts_optimize_init() adds the fts table to the fts_optimize_wq

InnoDB stores synced_doc_id + 1 value in FTS_CONFIG table. But
while reading the synced doc id from FTS_CONFIG table after restart,
InnoDB should read synced_doc_id - 1 to get the actual synced
doc id value.

using a specially crafted strings one could overflow `shift`
variable and cause a crash by dereferencing d10[-2147483648]
(on a sufficiently old gcc).

This is a correct fix and a test case for

Bug #29723340: MYSQL SERVER CRASH AFTER SQL QUERY WITH DATA ?AST

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