There were no InnoDB changes between MySQL 5.6.48 and MySQL 5.6.49.

This issue was originally reported by Fungo Wang, along with a fix, as
MySQL Bug #98990.

His suggested fix was applied as part of
mysql/mysql-server@a003fc373d1adb3ccea353b5d7d83f6c4c552383
and released in MySQL 5.7.31.

i_s_metrics_fill(): Add the missing call to Field::set_notnull(),
and simplify some code.

- i_s_fts_index_cache_fill() should take shared lock of fts cache
before accessing index cache to avoid reading stale data.

- Problem is that test case creates iblogfile* files. So existing
ibdata pages could point to future LSN. Fix is that taking the
backup of data before iblogfile* creation and apply it before
exiting the test case.

MDEV-22890 DEADLOCK of threads detected: row0sel.cc S-LOCK / btr0cur.cc S-LOCK / row0quiesce.cc X-LOCK

Problem:
=======
- Read operations are always allowed to hold a secondary index leaf
latch and then look up the corresponding clustered index record.
Flush table operation acquires secondary index latch while holding
a clustered index latch. It leads to deadlock violation.

Fix:
====
- Flush table operation should acquire secondary index before taking
clustered index to avoid deadlock violation with select operation.

Only install wsrep scripts and links if WSREP_ON is actually set

When setting the PLUGIN_AUTH_PAM variable, mark it as a "CACHE" variable
so it can be overridden by the user.

failed in Diagnostics_area::set_ok_status on FUNCTION replace

When there is REPLACE in the statement, sp_drop_routine_internal() returns
0 (SP_OK) on success which is then assigned to ret. So ret becomes false
and the error state is lost. The expression inside DBUG_ASSERT()
evaluates to false and thus the assertion failure.

While trying to detect datadir, take into account that one can use
Windows service name as section name in options file, for Windows service.

The historical obscurity is being used by WAMP installations.

MDEV-22390: Assertion `m_next_rec_ptr >= m_rawmem' failed in Filesort_buffer::spaceleft | SIGSEGV in __memmove_avx_unaligned_erms from my_b_write

Make sure that the sort_buffer that is allocated has atleast space for MERGEBUFF2 keys.
The issue here was that the record length is quite high and sort buffer size is very small,
due to which we end up with zero number of keys in the sort buffer. The Sort_param::max_keys_per_buffer
was zero in such a case, due to which we were flushing empty sort_buffer to the disk.

accept might return an error, including SOCKET_EAGAIN/
SOCKET_EINTR. The caller, usually handle_connections_sockets
can these however and invalid file descriptor isn't something
to call fcntl on.

Thanks to Etienne Guesnet (ATOS) for diagnosis,
sample patch description and testing.

This reverts commit e0793d38.

In idiomatic C++, accessor functions should not discard qualifiers.

- service not using "--defaults-file" can have any name not just "MySQL"
- service with "--defaults-file", without datadir in them
use default datadir (install_root\data)

and remove it on error

Disable existing non-empty datadir for mysql_install_db.exe

MDEV-23003 INFORMATION_SCHEMA.INNODB_TABLESPACES_ENCRYPTION requires SUPER instead PROCESS privilege

Fix a typo in a source code. Now real required privileges corresponds
to a ones mentions in documentation.

Documentation states that this table requires PROCESS privilege:
https://mariadb.com/kb/en/information-schema-innodb_tablespaces_encryption-table/

The issue here was that the left expr and right expr of the ANY subquery
had different character sets, so we were converting the left expr to utf8 character set.
So when this conversion was happening we were actually converting the item inside the cache,
it looked like <cache>(convert(t1.l1 using utf8)), which is incorrect.
To fix this problem we are going to store the reference of the left expr and convert that
to utf8 character set, it would look like convert(<cache>(`test`.`t1`.`l1`) using utf8)

Problem:
========
Relay_log_info::flush reports following MSAN issue.
==17820==WARNING: MemorySanitizer: use-of-uninitialized-value is reported
#5  0x00005584f0981441 in my_write (Filedes=22,
Buffer=0x72500003e818 "5\n./slave-relay-bin.000003\n21385\n
master-bin.000001\n21643\n0\n", '\245' <repeats 141 times>..., Count=118,
MyFlags=532) at /home/sujatha/bug_repo/test-10.5-msan/mysys/my_write.c:49

Analysis:
=========
In parallel replication at the end of each statement execution the worker execution
status is updated in 'relay-log.info' file. When two workers try to flush
the status at the same time, since the write to cache is not serialized both
workers write to the same address simultaneously and increment the
length twice. Because of this the length of buffer is more than actual data.
When flush code tries to read the buffer beyond valid data length MSAN
reports uninitialized values error.

Fix:
===
Serialize the relay log flush operation using "rli->data_lock".

Deadlock in DbugParse, on Linux.

In 10.1, DBUG recursive mutex was improperly implemented.
CODE_STATE::locked counter was never updated.

Copy the code around LockMutex/UnlockMutex from 10.2

Analysis:
========
When "Profiling" is enabled, server collects the resource usage of each
statement that gets executed in current session. Profiling doesn't support
nested statements. In order to ensure this behavior when profiling is enabled
for a statement, there should not be any other active query which is being
profiled. This active query information is stored in 'current' variable. When
a nested query arrives it finds 'current' being not NULL and server aborts.

When 'init_connect' and 'init_slave' system variables are set they contain a
set of statements to be executed. "execute_init_command" is the function call
which invokes "dispatch_command" for each statement provided in
'init_connect', 'init_slave' system variables. "execute_init_command" invokes
"start_new_query" and it passes the statement list to "dispatch_command". This
"dispatch_command" intern invokes "start_new_query" which leads to nesting of
queries. Hence '!current' assert is triggered.

Fix:
===
Remove profiling from "execute_init_command" as it will be done within
"dispatch_command" execution.

changes.

This requires Galera commit 065e484144c5999709ae8fd19844da72bb785073

On FreeBSD, perl isn't in /usr/bin, its in /usr/local/bin or
elsewhere in the path.

Like storage/{maria/unittest/,}ma_test_* , we use /usr/bin/env to
find perl and run it.

Apparently, in Win10, dtrace is avaialable, but it does not work with
MariaDB user probes

FreeState() zeros init_settings.out_file, which another thread can be using

The code in fill_schema_schemata() did not take into account that
make_db_list() can leave empty db_names if the requested database
name was too long, so the call for db_names.at(0) crashed on assert.

- Moving the code testing if the database directory exists
  into a separate function verify_database_directory_exists()
- Modifying the test to check if db_names is not empty

Problem:
=======
The "Start binlog_dump" message hasn't been updated to include the slave's
requested GTID position:

20:05:05 139836760311552 [Note] Start binlog_dump to slave_server(2), pos(, 4)

For diagnostic purposes, it would be helpful if the GTID position were
included.

Fix:
===
Imporve "Start binlog_dump" print message to include "using_gtid" and
"GTID position" requested by slave.

Ex:
[Note] Start binlog_dump to slave_server(2), pos(, 4), using_gtid(1),
  gtid('1-1-201,2-2-100')

[Note] Start binlog_dump to slave_server(3), pos('mariadb-bin.004142',
  507988273), using_gtid(0), gtid('')

Use krb5_xfree if available, otherwise default to
krb5_free_unparsed_name.

MDEV-22755 CREATE USER leads to indirect SIGABRT in __stack_chk_fail () from fill_schema_user_privileges + *** stack smashing detected *** (on optimized builds)

The code erroneously used buff[100] in a fiew places to make
a GRANTEE value in the form:
  'user'@'host'

Fix:
- Fixing the code to use (USER_HOST_BUFF_SIZE + 6) instead of 100.
- Adding a DBUG_ASSERT to make sure the buffer is enough
- Wrapping the code into a class Grantee_str, to reuse it easier in 4 places.

On large hard disks (> 2TB), the plugin won't function correctly, always
showing 2 TB of available space due to integer overflow. Upgrade table
fields to bigint to resolve this problem.

The real problem was that attempt to roll back cahnes after end of memory in QC was made incorrectly and lead to using uninitialized memory.
(bug has nothing to do with resize operation, it is just lack of resources erro processed incorrectly)

This reverts commit 44339123.

In case of SELECT without tables which returns either 0 or 1 rows,
JOIN::exec_inner() did not check if the flag representing SQL_CALC_FOUND_ROWS
is set or not and send_records was direclty assigned 0. So SELECT FOUND_ROWS()
was giving 0 in the output. Now it checks if the flag is set, if it is set
send_record=1 else 0. 1 is the number of rows that could have been sent
to the client if the SELECT query had SQL_CALC_FOUND_ROWS.
It is 0 when no rows were sent because the SELECT query did not have
SQL_CALC_FOUND_ROWS.

MDEV-22717: Conditional jump or move depends on uninitialised value(s) in find_uniq_filename(char*, unsigned long)

Fix:
===
Initialize 'number' variable to '0'.

MDEV-22728: SIGFPE in Unique::get_cost_calc_buff_size from prepare_search_best_index_intersect on optimized builds

For low sort_buffer_size, in the cost calculation of using the Unique object the elements in the tree were evaluated to 0, make sure to have atleast 1 element in the Unique tree.

Also for the function Unique::get allocate memory for atleast MERGEBUFF2+1 keys.

For DECIMAL[(M[,D])] datatype max_sort_length was not being honoured which was leading to buffer
overflow while making the sort key. The fix to this problem would be to create sort keys for decimals
with atmost max_sort_key bytes

Important:
The minimum value of max_sort_length has been raised to 8 (previously was 4),
so fixed size datatypes like DOUBLE and BIGINIT are not truncated for
lower values of max_sort_length.