- Adding class Field_int as a common
  parent for Field_{longlong|long|short|medium|tiny}
- Moving store_decimal(), val_decimal(), get_date(), store_time_dec(),
  get_date(), val_bool() from Field_num to Field_int
- Adding Field_int::val_str_from_long() and reusing it in
  Field_tiny::val_str(), Field_short::val_str(), Field_medium::val_str()
  and Field_long::val_str(). This removes a good amount of duplicate code
- Adding "const" qualifier to "virtual bool Field::optimize_range()".

Handle overlaping "from" and Field_blob_compressed::value for compressed
blobs similarily to regular blobs.

MDEV-14831 CREATE OR REPLACE SEQUENCE under LOCK TABLE corrupts the
sequence, causes ER_KEY_NOT_FOUND

The problem was that sequence_insert didn't properly handle the case
where there where there was a LOCK TABLE while creating the sequence.

Fixed by opening the sequence table, for inserting the first record, in
a new environment without any other open tables.

Found also a bug in Locked_tables_list::reopen_tables() where the lock
structure for the new tables was allocated in THD::mem_root, which causes
crashes. This could cause problems with other create tables done under
LOCK TABLES.

Use high accuracy timer on Windows 8.1+ for system versioning,it needs
accurate high resoution start query time.

Continue to use the inaccurate (but much faster timer function)
GetSystemTimeAsFileTime() where accuracy does not matter, e.g in
set_timespec_time_nsec(),or my_time()

This reverts commit d2660362.
The patch would cause a crash when DROP TABLE is executed
and the .ibd file is missing. It is not easy to fix this;
there is some delicate logic in fil_space_get_page_size().

btr_free_root_check(), btr_free_if_exists():
Replace page_id, page_size with fil_space_t* and the
root page number.

btr_free_but_not_root(): Take fil_space_t* as a parameter,
or NULL if the operation is not going to be redo-logged.

btr_free(): Pass space=NULL to btr_free_but_not_root().

this is a 10.3 version of 27d94b7e

It disables caching of the first argument of IN,
if it's of a temporal type. Because other types are not
cached in this context.

this is a 10.3 version of 1c6f6dc8

this is a 10.3 version of 885edc4f

reorder items in args[] array. Instead of

  when1,then1,when2,then2,...[,case][,else]

sort them as

  [case,]when1,when2,...,then1,then2,...[,else]

in this case all items used for comparison take a continuous part
of the array and can be aggregated directly. and all items that
can be returned take a continuous part of the array and can be
aggregated directly. Old code had to copy them to a temporary
array before aggreation, and then copy back (thd->change_item_tree)
everything that was changed.

this is a 10.3 version of bf1ca14f

fil_space_for_table_exists_in_mem(): Fix a regression that was
introduced in commit 05863142
when removing fil_system.name_hash. The condition
!valid || space == fnamespace
was incorrectly replaced with !valid, instead of true.

fil_report_missing_tablespace(): Merge to the only caller.

Introduced new status variable for custom aggregate functions.

InnoDB always keeps all tablespaces in the fil_system cache.
The fil_system.LRU is only for closing file handles; the
fil_space_t and fil_node_t for all data files will remain
in main memory. Between startup to shutdown, they can only be
created and removed by DDL statements. Therefore, we can
let dict_table_t::space point directly to the fil_space_t.

dict_table_t::space_id: A numeric tablespace ID for the corner cases
where we do not have a tablespace. The most prominent examples are
ALTER TABLE...DISCARD TABLESPACE or a missing or corrupted file.

There are a few functional differences; most notably:
(1) DROP TABLE will delete matching .ibd and .cfg files,
even if they were not attached to the data dictionary.
(2) Some error messages will report file names instead of numeric IDs.

There still are many functions that use numeric tablespace IDs instead
of fil_space_t*, and many functions could be converted to fil_space_t
member functions. Also, Tablespace and Datafile should be merged with
fil_space_t and fil_node_t. page_id_t and buf_page_get_gen() could use
fil_space_t& instead of a numeric ID, and after moving to a single
buffer pool (MDEV-15058), buf_pool_t::page_hash could be moved to
fil_space_t::page_hash.

FilSpace: Remove. Only few calls to fil_space_acquire() will remain,
and gradually they should be removed.

mtr_t::set_named_space_id(ulint): Renamed from set_named_space(),
to prevent accidental calls to this slower function. Very few
callers remain.

fseg_create(), fsp_reserve_free_extents(): Take fil_space_t*
as a parameter instead of a space_id.

fil_space_t::rename(): Wrapper for fil_rename_tablespace_check(),
fil_name_write_rename(), fil_rename_tablespace(). Mariabackup
passes the parameter log=false; InnoDB passes log=true.

dict_mem_table_create(): Take fil_space_t* instead of space_id
as parameter.

dict_process_sys_tables_rec_and_mtr_commit(): Replace the parameter
'status' with 'bool cached'.

dict_get_and_save_data_dir_path(): Avoid copying the fil_node_t::name.

fil_ibd_open(): Return the tablespace.

fil_space_t::set_imported(): Replaces fil_space_set_imported().

truncate_t: Change many member function parameters to fil_space_t*,
and remove page_size parameters.

row_truncate_prepare(): Merge to its only caller.

row_drop_table_from_cache(): Assert that the table is persistent.

dict_create_sys_indexes_tuple(): Write SYS_INDEXES.SPACE=FIL_NULL
if the tablespace has been discarded.

row_import_update_discarded_flag(): Remove a constant parameter.

fsp_get_available_space_in_free_extents(): Declare the function static
in the only caller, and take const fil_space_t& as a parameter.

fil_space_get_by_name(): Remove.
(Implement differently in mariabackup.)

fil_ibd_open(): Check if the tablespace by the same ID already
exists. If it is the same name, return success, else failure.

trx_rsegf_get(), trx_undo_get_first_rec(): Change the parameter to
fil_space_t* so that fewer callers need to be adjusted.

trx_undo_free_page(): Remove the redundant parameter 'space'.

Remove the parameter page_size, and pass a dummy page size
to buf_page_get_gen() along with BUF_PEEK_IF_IN_POOL.

fil_discard_tablespace(): Merge to row_discard_tablespace()
which was the only caller.

fil_recreate_table(), fil_recreate_tablespace(),
fil_reinit_space_header_for_table(): Move the functions
to the only calling module and declare static.

fil_recreate_table(): Remove the constant parameter space_id=0,flags.

Replace index->table_name with index->table->name.

We can rely on the dict_table_t::space. All indexes of a table object
are always in the same tablespace. (For fulltext indexes, the data is
located in auxiliary tables, and these will continue to have their own
table objects, separate from the main table.)

This is a non-functional change (pure refactoring).

fsp_header_init(): Take fil_space_t* as a parameter.

Add fil_system_t::sys_space, fil_system_t::temp_space.
These will replace lookups for TRX_SYS_SPACE or SRV_TMP_SPACE_ID.

mtr_t::m_undo_space, mtr_t::m_sys_space: Remove.

mtr_t::set_sys_modified(): Remove.

fil_space_get_type(), fil_space_get_n_reserved_extents(): Remove.

fsp_header_get_tablespace_size(), fsp_header_inc_size():
Merge to the only caller, innobase_start_or_create_for_mysql().

fil_system_t::create(): Replaces fil_init(), fsp_init().

fil_system_t::close(): Replaces fil_close().

fil_system_t::max_n_open: Remove. Use srv_max_n_open_files directly.

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

create_table_info_t::create_table_def(): Assign the innodb_temporary
tablespace directly.

dict_build_tablespace_for_table(): Merge to the only remaining caller,
dict_build_table_def_step().