Fix errors caught by clang-7 in the encrypted variants of the tests
innodb.innodb-table-online innodb.innodb-index-online

stalls etc better.

- thread_pool_exact_stats -  uses high precision timestamp for
the time when connection was added to the queue. This timestamp helps
calculating queuing time shown in I_S.THREADPOOL_QUEUES entries.

- If thread_pool_dedicated_listener is on, then each group will have its
own dedicated listener, that does not convert to worker.
With this variable on, the queueing time in I_S.THREADPOOL_QUEUES , and
actual queue size in I_S.THREADPOOOL_GROUPS will be more exact, since
IO request are immediately dequeued from poll, without delay.


Part of MDEV-19313.

Added thread_pool_groups, thread_pool_queues, thread_pool_waits and
thread_pool_stats tables to information_schema.

Means, plugin will not be available in embedded, even if compiled-in

In Wolfcrypt, output length after CTR encryption is not the same
as input length. This is different from openssl and this makes unit test
aes-t fail.

So disable CTR for now.

MDEV-19581 Valgrind error with WolfSSL and encrypted binlog

WolfSSL can read  memory out of bounds in EVP_CipherUpdate()
in decrypt/NOPAD mode, when the input length is not multiple of AES block
size.

The workaround ensures that input will have some padding at the end
by having slightly larger allocated buffer, or padding the structures
with 16 more bytes.

ARMv8 (AArch64) CPUs implement the CRC32 extension which is implemented by inline assembly ,
so they can also benefit from hardware acceleration in IO-intensive workloads.

The patch optimizes crc32c calculate with the armv8 crypto instruction(Intrinsics) when available
rather than original linear crc instructions.

Change-Id: I05d36a64c726d910c47befad93390108f4e6567f
Signed-off-by: Yuqi Gu <yuqi.gu@arm.com>

There is only one InnoDB crash recovery subsystem.
Allocating recv_sys statically removes one level of pointer indirection
and makes code more readable, and removes the awkward initialization of
recv_sys->dblwr.

recv_sys_t::create(): Replaces recv_sys_init().

recv_sys_t::debug_free(): Replaces recv_sys_debug_free().

recv_sys_t::close(): Replaces recv_sys_close().

recv_sys_t::add(): Replaces recv_add_to_hash_table().

recv_sys_t::empty(): Replaces recv_sys_empty_hash().

InnoDB duplicates file descriptor returned by create_temp_file() to
workaround further inconsistent use of this descriptor.

Use mysys file descriptors consistently for innobase_mysql_tmpfile(path).
Mostly close it by appropriate mysys wrappers.

InnoDB duplicates file descriptor returned by create_temp_file() to
workaround further inconsistent use of this descriptor.

Use mysys file descriptors consistently for innobase_mysql_tmpfile(NULL).
Mostly close it by appropriate mysys wrappers.

The option innodb_rollback_segments was deprecated already in
MariaDB Server 10.0. Its misleadingly named replacement innodb_undo_logs
is of very limited use. It makes sense to always create and use the
maximum number of rollback segments.

Let us remove the deprecated parameter innodb_rollback_segments and
deprecate&ignore the parameter innodb_undo_logs (to be removed in a
later major release).

This work involves some cleanup of InnoDB startup. Similar to other
write operations, DROP TABLE will no longer be allowed if
innodb_force_recovery is set to a value larger than 3.

The parameter innodb_stats_sample_pages became an alias for
innodb_stats_transient_sample_pages and was deprecated in
MariaDB Server 10.0. Let us finally remove that alias.

The transaction isolation levels READ COMMITTED and READ UNCOMMITTED
should behave similarly to the old deprecated setting
innodb_locks_unsafe_for_binlog=1, that is, avoid acquiring gap locks.

row_search_mvcc(): Reduce the scope of some variables, and clean up
the initialization and use of the variable set_also_gap_locks.

The parameter innodb_log_checksums that was introduced in MariaDB 10.2.2
via mysql/mysql-server@af0acedd885eb7103e319f79d25fda7386ef1506
does not make much sense. The original motivation of introducing this
parameter (initially called innodb_log_checksum_algorithm in
mysql/mysql-server@22ba38218e1d76c24f69b5a5595ad3bf5933acb0)
was that the InnoDB redo log used the slow and insecure innodb algorithm.
With hardware or SIMD accelerated CRC-32C, there should be no reason to
allow checksums to be disabled on the redo log.

The parameter innodb_encrypt_log already implies innodb_log_checksums=ON.

Let us deprecate the parameter innodb_log_checksums and always compute
redo log checksums, even if innodb_log_checksums=OFF is specified.

An upgrade from MariaDB 10.2.2 or later will only be possible after
using the default value innodb_log_checksums=ON. If the non-default
value innodb_log_checksums=OFF was in effect when the server was shut down,
a log block checksum mismatch will be reported and the upgraded server
will fail to start up.

maria_open(): Initialize share->mode=0 for S3

The test result was affected by
commit 007f68c3
but the adjustment was inadvertently omitted.

To get a stacktrace in a program like aria_chk, one only have to do:

#include <my_stacktrace.h>

call my_init_stacktrace(1) in main().

A read-only storage engine that stores it's data in (aws) S3

To store data in S3 one could use ALTER TABLE:
ALTER TABLE table_name ENGINE=S3

libmarias3 integration done by Sergei Golubchik
libmarias3 created by Andrew Hutchings

Removed not needed table renames when doing ALTER TABLE when engine
changes and both of the following is true:
- Either new or old engine does not store the table in files
- Neither old or new engine uses files from another engine

We also skip renames when ALTER TABLE does an explicit rename

This improves performance, especially for engines where rename is
a slow operation (like the upcoming S3 engine)

Discoverred to be needed by the upcoming S3 engine

Reason for the change was that ha_notify_table_changed() was done
after table open when .frm had been replaced, which caused failure
in engines that checks on open if .frm matches the engines table
definition.

Other changes:
- Remove not needed open/close call at end of inline alter table.
  Some test that depended on the table beeing in the table cache after
  ALTER TABLE had to be updated.

This was done to match the naming of the ALTER #sql-#-# tmp files

- Add new submodule for WolfSSL
- Build and use wolfssl and wolfcrypt instead of yassl/taocrypt
- Use HAVE_WOLFSSL instead of HAVE_YASSL
- Increase MY_AES_CTX_SIZE, to avoid compile time asserts in my_crypt.cc
(sizeof(EVP_CIPHER_CTX) is larger on WolfSSL)