Cherry-picking only test case.

trx_undo_mem_create_at_db_start(): Relax too strict upgrade checks
that were introduced in
commit e46f76c9 (MDEV-15912).
On commit, pages will typically be set to TRX_UNDO_CACHED state.
Having the type TRX_UNDO_INSERT in such pages is common and
unproblematic; the type would be reset in trx_undo_reuse_cached().

trx_rseg_array_init(): On failure, clean up the rollback segments
that were initialized so far, to avoid an assertion failure later
during shutdown.

init_crypt_key(): On failure, set info->key_version to
ENCRYPTION_KEY_VERSION_INVALID.

log_crypt_101_read_block(): Refuse to attempt decryption if
info->key_version is ENCRYPTION_KEY_VERSION_INVALID.

This bug affected queries with views / derived_tables / CTEs whose
specifications were of the form
  (SELECT ... LIMIT <n>) ORDER BY ...
Units representing such specifications contains one SELECT_LEX structure
for (SELECT ... LIMIT <n>) and additionally SELECT_LEX structure for
fake_select_lex. This fact should have been taken into account in the
function mysql_derived_fill().

This patch has to be applied to 10.2 and 10.3 only.

This bug affected queries with views / derived_tables / CTEs whose
specifications were of the form
  (SELECT ... LIMIT <n>) ORDER BY ...
Units representing such specifications contains one SELECT_LEX structure
for (SELECT ... LIMIT <n>) and additionally SELECT_LEX structure for
fake_select_lex. This fact should have been taken into account in the
function mysql_derived_fill().

This patch has to be applied to 10.2 and 10.3 only.

trx_undo_report_row_operation(): Fix a race condition that was introduced
in commit f74023b9 (MDEV-15090).
We must not access undo_block after the page latch has been released
in mtr_t::commit(), because the block could be evicted or replaced.

In the merge commit d3e4fae7
a message about innodb_force_recovery was accidentally duplicated.

Let us simply refuse an upgrade from earlier versions if the
upgrade procedure was not followed. This simplifies the purge,
commit, and rollback of transactions.

Before upgrading to MariaDB 10.3 or later, a clean shutdown
of the server (with innodb_fast_shutdown=1 or 0) is necessary,
to ensure that any incomplete transactions are rolled back.
The undo log format was changed in MDEV-12288. There is only
one persistent undo log for each transaction.

Builds on travis-ci.org ceased on 2021-06-15.

see also 068246c0

see also a5f6eca5

spider tests use

--let $var= many;sql;statements
--eval $var

and this doesn't work in ps

and *never* disable tests in suite.pm based on $::opt_big_test,
this will make the test skipped both as too big (for ./mtr)
and as too small (for ./mtr --big --big).

- Make innodb_fts.misc_debug test case more stable.

In commit 1c35a3f6 a useless
computation that used the variable was removed.

Additional improvements aimed at improving operational
reliability of the SST scripts:

1) Script need to give rsync and stunnel a short time to
   terminate after "kill -9" before the first PID check
   using ps utility;
2) The temporary file used to create the binlog index could
   sometimes remain in the data directory if tar failed and
   then may be reused without being cleaned up (the next
   time when SST was run) - now it's fixed;
3) The temporary file used to build the binlog index is now
   created using mktemp and, if this variable is present in
   the configuration file, in tmpdir;
4) Checking the secret tag in SST via rsync is made faster
   and does not require creating a temporary file, which
   could remain in the data directory in case of failure;
5) Added "-F" option to grep to check the tag when using
   mariabackup/xtrabackup-v2 - to avoid possible collisions
   in case of special characters in the tag value (unlikely
   scenario, but the new check is more reliable).

This commit fixes a bug was originally discovered during the
galera_nbo_sst_slave mtr test for 10.6 branch. However it is
relevant for all versions and can lead to intermittent SST
crashes via rsync on very fast server restarts - when a new
SST process (for example, after starting a new server instance)
overlaps the old SST process started by the previous, already
terminated server. This overlap can result in the new rsync
being killed instead of the old rsync, or the pid file from
the new rsync being killed, which then lead to problems.

a new warning -Wunused-but-set-variable was introduced recently to clang

- During online alter conversion from compact to redundant,
virtual column field length already set during
innobase_get_computed_value(). Skip the char(n) check for
virtual column in row_merge_buf_add()

MDEV-25872 InnoDB: Assertion failure in row_merge_read_clustered_index upon ALTER on table with indexed virtual columns

- InnoDB fails to check DB_COMPUTE_VALUE_FAILED error in
row_merge_read_clustered_index() and wrongly asserts that
the buffer shouldn't be ran out of memory. Alter table
should give warning when the column value is being
truncated.

Problem:
=======
- InnoDB iterates the fil_system space list to encrypt the
tablespace in case of key rotation. But it is not
necessary for any encryption plugin which doesn't do
key version rotation.

Solution:
=========
- Introduce a new variable called srv_encrypt_rotate to
indicate whether encryption plugin does key rotation

fil_space_crypt_t::key_get_latest_version(): Enable the
srv_encrypt_rotate only once if current key version is
higher than innodb_encyrption_rotate_key_age

fil_crypt_must_default_encrypt(): Default encryption tables
should be added to default_encryp_tables list if
innodb_encyrption_rotate_key_age is zero and encryption
plugin doesn't do key version rotation

fil_space_create(): Add the newly created space to
default_encrypt_tables list if
fil_crypt_must_default_encrypt() returns true

Removed the nondeterministic select from
innodb-key-rotation-disable test. By default,
InnoDB adds the tablespace to the rotation list and
background crypt thread does encryption of tablespace.
So these select doesn't give reliable results.

- Rename the rotation list to default_encrypt_tables in
fil_system_t. Because rotation list naming could be
misleading when it comes to key version rotation

- Rename is_in_rotation_list to is_in_default_encrypt
in fil_space_t

- Rename keyrotate_next function to default_encrypt_next

fil_system_t::default_encrypt_next(): Find the next
suitable default encrypt table if beginning of
default_encrypt_tables list has been scheduled
to be deleted

Brad Smith made this OpenBSD file based of the
FreeBSD cmake directives in commit ab589043
by the Monty Program Ab.

As such the Oracle Copyright header isn't really applicable.

Fix malloc/delete mismatch. This causes a double free in the cleanup.

closes #1845

* read_command_buf is a pointer now, sizeof() no longer reflects its
  length, read_command_buflen is.
* my_safe_print_str() prints multiple screens of '\0' bytes after the
  query end and up to read_command_buflen. Use fprintf() instead.
* when setting connection->name to "-closed_connection-" update
  connection->name_len to match.

The check-testcase record uses a mysqltest connection
to the database to do the recording. With the server configured
as an abstract socket, the mysqltest client cannot connect and
fails.

We work around this by starting the server as normal and then
restart with an abstract socket and test this.

This didn't affect Windows as it just did a tcp connection.
So this did affect all unix socket based systems except Linux
as this was the only one that supported abstract sockets.

Not all environments have 'diff' installed. Most notably CentOS 8
does not have diff out-of-the-box. Thus users running 'cmake .' and
'make' would fail to build MariaDB, and they would think the error
was in ABI incompatibilities due to the error message emitted by CMake
when in reality simply 'diff' was missing.

This fixes it and makes the developer experience better by simply
skipping the diffing if 'diff' is not found.

Closes #1846

Removed Field_map, since it was used only in a single function.

Fixed is_indexed_agg_distinct(), since it relied on initialization of
Bitmap in constructor.

Fixes MDEV-25888 in 10.4