Since the client host can be extracted from the network connection, it can
always be printed. This makes it easier to find out where a slave is
replicating from. It could also be used to automatically discover slaves
that are replicating from a master.

This is an issue of memory alignment of variable argument when calling my_multi_malloc().
The fix is strictly casting allocating size to "uint".

Perl DBD::MariaDB driver is available CPAN and is already used in
production environment.

This will allow to check ABI for C++ plugins defined in include/mysql/plugin.h
e.g. like this:

struct st_mysql_xxx
{
 int interface_version;
 const class XXX *xxx;
};

Discussed with Serg.

plugin/versioning adds its own native functions by calling
item_create_append(). So GIS functions initialized two times.

Moving the initialization of GIS functions from item_create_append()
to item_create_init().

Cleanups.

* Mitigate race candition when got_no_such_table remains uncleared.
* Remove warnings about deprecated SELECT .. FROM .. INTO ...

MDEV-16222 Assertion `0' failed in row_purge_remove_sec_if_poss_leaf on table with virtual columns and indexes

MDEV-19175 Server crashes in ha_partition::vers_can_native upon INSERT DELAYED into versioned partitioned table

Uninitialized LEX::part_info on ha_partition::vers_can_native().

MDEV-16222 Assertion `0' failed in row_purge_remove_sec_if_poss_leaf on table with virtual columns and indexes

Cause
Stale thd->m_stmt_da->m_sql_errno which is from different invocation.

Fix
Reset error state before attempt to open table.

Another fail fix:

undefined reference to `ZipLoadFile`

MDEV-19972 Move GIS code from Item_bool_func::get_full_func_mm_tree() to Item_func_spatial_rel::get_mm_leaf()

In this statement:

  (uint *) thd->alloc(sizeof(uint) * field->interval->count+1);

parentheses around the '+' operator were missing. So too few memory
was allocated, which caused ASAN builds to fail on these tests:

  innodb.innodb-ucs2
  parts.part_ctype_utf32
  main.mix2_myisam_ucs2
  main.case
  main.ctype_ucs
  main.ctype_utf16
  main.ctype_utf16_uca
  main.ctype_utf16le

Fixed to a correct version with parentheses:

  (uint *) thd->alloc(sizeof(uint) * (field->interval->count+1));

According to the code, it was Windows specific "simulated AIO"
workaround. The simulated s not supported on Windows anymore.

Thus, remove the dead code

We use own IO callbacks from server code anyway.

- allow incremental linking for Debug build
- do not allow EDITANDCONTINUE (/ZI)
- better clang-cl warnings flags

Many InnoDB internal variables and counters were only exposed
in an unstructured fashion via SHOW ENGINE INNODB STATUS.

Expose more variables via SHOW STATUS. Many of these were
exported in XtraDB.

Also, introduce SHOW_SIZE_T and use the proper size for
exporting the InnoDB variables.

Remove some unnecessary indirection via export_vars, and
bind some variables directly.

dict_sys_t::rough_size(): Replaces dict_sys_get_size()
and includes the hash table sizes.

This is based on a contribution by Tony Liu from ServiceNow.