When "FLUSH TABLE ... FOR EXPORT" fails, the SQL layer should rollback
the statement. Otherwise we hit an assert when we try to close the
tables while having a non-empty list of statement transaction participants.

- compile_flags already include from top CMakeLists.txt
- MY_CHECK_CXX_COMPILER_FLAG() accepts only one parameter
- output variable of MY_CHECK_CXX_COMPILER_FLAG() is have_CXX__Wa__nH
- same check for mariabackup

Based on contribution by satanson (PR#466).

dict_foreign_qualify_index(): Avoid a redundant and harmful
computation of col_name of a virtual column. This fixes the
assertion failure.

dict_foreign_push_index_error(): Do not call dict_table_get_col_name()
on a virtual column. (It is unclear if this condition is actually
reachable.)

log_write_up_to(): Erase the end of the current log block.
Simplify the computation of pad_size.

log_buffer_switch(): Evaluate a condition only once.

- recovered_lsn shouldn't be initialized during xtrabackup_copy_logfile().
If partial redo log read during the end of xtrabackup_copy_logfile() then
recovered_lsn will be different from scanned_lsn. Re-initialization of
recovered_lsn could lead to partial read again. It is a regression of
MDEV-14545

           Item::derived_field_transformer_for_having

The crash occurred due to an inappropriate handling of multiple equalities
when pushing conditions into materialized views/derived tables. If equalities
extracted from a multiple equality can be pushed into a materialized
view/derived table they should be plainly conjuncted with other pushed
predicates rather than form a separate AND sub-formula.

concurrently.

There is a deadlock between

C1 mariabackup's connection that holds MDL locks
C2 Online ALTER TABLE that wants to have MDL exclusively
   and tries to upgrade its mdl lock.
C3 another mariabackup's connection that does FLUSH TABLES (or FTWRL)

C3 waits waits for C2,  which waits for C1, which waits for C3,
thus the deadlock.


MDL locks cannot be released until FLUSH  succeeds, because
otherwise it would allow ALTER to sneak in, causing backup to abort and
breaking lock-ddl-per-table's promise.

The fix here workarounds the deadlock, by killing connections in
"Waiting for metadata lock" status (i.e ALTER). This killing continues
until FTWRL succeeds.

Killing connections is skipped in case --no-locks parameter
was  passed to backup, because there won't be a FLUSH.

For the reference,in Percona's xtrabackup --lock-ddl-per-connection
silently implies --no-lock ie FLUSH is always skipped there.

A rather large part of fix is introducing DBUG capability to start
a query  the new connection at the right moment of backup
compensating somewhat for mariabackup' lack of send_query or DBUG_SYNC.

HAVE_LARGE_PAGES was always Linux but now there is
HAVE_SOLARIS_LARGE_PAGES in the code base. Innodb was using HAVE_LINUX_LARGE_PAGES
so keep this consistent everywhere.

Test plan:

$ grep Hugepagesize: /proc/meminfo
Hugepagesize:       2048 kB

$ sudo sysctl vm.nr_hugepages=1024
vm.nr_hugepages = 1024
$ sudo sysctl  kernel.shmmax=$(( 2 * 1024 *1024 * 1024 ))
kernel.shmmax = 2147483648

No errors in ouput:
$ sql/mysqld --skip-networking --datadir=/tmp/datadir --log-bin=/tmp/datadir/mysqlbin --socket /tmp/s.sock --lc-messages-dir=${PWD}/sql/share --verbose --large-pages=1
2018-03-23 12:51:18 139697428129984 [Note] sql/mysqld (mysqld 10.2.14-MariaDB-log) starting as process 25406 ...
2018-03-23 12:51:18 139697428129984 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2018-03-23 12:51:18 139697428129984 [Note] InnoDB: Uses event mutexes
2018-03-23 12:51:18 139697428129984 [Note] InnoDB: Compressed tables use zlib 1.2.11
2018-03-23 12:51:18 139697428129984 [Note] InnoDB: Using Linux native AIO
2018-03-23 12:51:18 139697428129984 [Note] InnoDB: Number of pools: 1
2018-03-23 12:51:18 139697428129984 [Note] InnoDB: Using SSE2 crc32 instructions
2018-03-23 12:51:18 139697428129984 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2018-03-23 12:51:18 139697428129984 [Note] InnoDB: Completed initialization of buffer pool
2018-03-23 12:51:18 139696883590912 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
2018-03-23 12:51:18 139697428129984 [Note] InnoDB: Highest supported file format is Barracuda.
2018-03-23 12:51:18 139697428129984 [Note] InnoDB: 128 out of 128 rollback segments are active.
2018-03-23 12:51:18 139697428129984 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2018-03-23 12:51:18 139697428129984 [Note] InnoDB: Creating shared tablespace for temporary tables
2018-03-23 12:51:18 139697428129984 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2018-03-23 12:51:18 139697428129984 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2018-03-23 12:51:18 139697428129984 [Note] InnoDB: 5.7.21 started; log sequence number 1620099
2018-03-23 12:51:18 139696713733888 [Note] InnoDB: Loading buffer pool(s) from /tmp/datadir/ib_buffer_pool
2018-03-23 12:51:18 139696713733888 [Note] InnoDB: Buffer pool(s) load completed at 180323 12:51:18
2018-03-23 12:51:18 139697428129984 [Note] Plugin 'FEEDBACK' is disabled.
2018-03-23 12:51:18 139697428129984 [Note] Reading of all Master_info entries succeded
2018-03-23 12:51:18 139697428129984 [Note] Added new Master_info '' to hash table
2018-03-23 12:51:18 139697428129984 [Note] sql/mysqld: ready for connections.
Version: '10.2.14-MariaDB-log'  socket: '/tmp/s.sock'  port: 0  Source distribution

$ grep -i huge /proc/25406/smaps | grep -v ' 0 kB'
Private_Hugetlb:    8192 kB
Private_Hugetlb:    2048 kB
$ grep huge /proc/25406/numa_maps
7f0d74400000 default file=/SYSV00000000\040(deleted) huge
7f0dbd200000 default file=/SYSV00000000\040(deleted) huge dirty=4 N0=4 kernelpagesize_kB=2048
7f0dc5600000 default file=/SYSV00000000\040(deleted) huge
7f0dd1200000 default file=/SYSV00000000\040(deleted) huge dirty=1 N0=1 kernelpagesize_kB=2048

$ grep Huge  /proc/meminfo
AnonHugePages:         0 kB
ShmemHugePages:        0 kB
HugePages_Total:     940
HugePages_Free:      935
HugePages_Rsvd:      177
HugePages_Surp:        0
Hugepagesize:       2048 kB

Ran again with --memlock
(note needs ulimit -l > size)

$ grep Huge  /proc/meminfo
AnonHugePages:         0 kB
ShmemHugePages:        0 kB
HugePages_Total:     940
HugePages_Free:      758
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:       2048 kB

$ grep huge /proc/26020/numa_maps
7fe870400000 default file=/SYSV00000000\040(deleted) huge dirty=62 N0=62 kernelpagesize_kB=2048
7fe8b3a00000 default file=/SYSV00000000\040(deleted) huge dirty=66 N0=66 kernelpagesize_kB=2048
7fe8bd600000 default file=/SYSV00000000\040(deleted) huge dirty=53 N0=53 kernelpagesize_kB=2048
7fe8c8400000 default file=/SYSV00000000\040(deleted) huge dirty=1 N0=1 kernelpagesize_kB=2048

$ grep -i huge /proc/26020/smaps | grep -v ' 0 kB'
Private_Hugetlb:  126976 kB
Private_Hugetlb:  135168 kB
Private_Hugetlb:  108544 kB
Private_Hugetlb:    2048 kB

It does not hurt to delete non-existing records from SYS_TABLESPACES
and SYS_DATAFILES. Because MariaDB does not support CREATE TABLESPACE,
only the system tablespace (space_id=0) can contain multiple tables.
But, there are no entries for the system tablespace in these tables
(which actually are stored inside the system tablespace).

MariaDB differs from the upstream for "DDL-like" command. For these,
it sets binlog_format=STATEMENT for the duration of the statement.
This doesn't play well with MyRocks, which tries to prevent DML
commands with binlog_format!=ROW.

Also, if Locked_tables_list::reopen_tables() returned an error, then
close_cached_tables should propagate the error condition and not silently
consume it (it's difficult to have test coverage for this because this
error condition is rare)

Skip the test mariabackup.unsupported_redo if a checkpoint occurred
before mariabackup --backup completed. Remove the slow shutdowns
and restarts which were attempting to prevent the checkpoints from
occurring.

The purpose of the InnoDB buffer pool dump is to allow InnoDB to be
restarted with the same persistent data pages in the buffer pool.

The InnoDB temporary tablespace that was introduced in MariaDB 10.2.2
is always reinitialized on restart. Therefore, it does not make sense
to attempt to dump or restore any pages of the temporary tablespace.

ha_innobase::check_if_supported_inplace_alter(): Only check for
high_level_read_only. Do not unnecessarily refuse
ALTER TABLE...ALGORITHM=INPLACE if innodb_force_recovery was
specified as 1, 2, or 3.

innobase_start_or_create_for_mysql(): Block all writes from SQL
if the system tablespace was initialized with 'newraw'.

Adjust the testcase to handle all possible outcomes.

- Disallow loading of MyRocks (or any auxilary) plugins after it has been
  unloaded.
- Do it carefully - Plugin's system variables may be accesssed (e.g. default
  value is set) after the first rocksdb_done_func() call but before
  the secon rocksdb_init_func() call.

Ignore the warning.
On Windows, Galera is not available so the server starts in non-XA mode
when both MyRocks and InnoDB are disabled.

Test changes only.

Problem:
=======
	During validation of missing tablespace, missing tablespace id is
being compared with hash table of redo logs (recv_sys->addr_hash). But if the
hash table ran out of memory then there is a possibility that it will not contain
the redo logs of all tablespace. In that case, Server will load the InnoDB
even though there is a missing tablespace.

Solution:
========
	If the recv_sys->addr_hash hash table ran out of memory then InnoDB needs
to scan the remaining redo log again to validate the missing tablespace.

When the plugin is unloaded, walk the s_trx_list and delete the left over
Rdb_transaction objects.
It is responsibility of the SQL layer to make sure that the storage engine
has no open tables when the plugin is being unloaded.

Scientific notation handling fixed.

and remove redundant have_innodb.inc, it's included in
galera_cluster.inc anyway.

and remove redundant have_innodb.inc, it's included in
galera_cluster.inc anyway.

extra/mariabackup/ds_buffer.c:145:9: warning: pointer targets in assignment differ in signedness [-Wpointer-sign]

information can be obtained.

plugin only enabled for Linux, as it fails building on BSD/MacOSX.
disks.test fixed.

information can be obtained.

disks.test moved to plugin's directory.