Added encryption support for online alter table where InnoDB temporary
files are used. Added similar support also for tables containing
full text-indexes.

Made sure that table remains encrypted during discard and import
tablespace.

MDEV-8699 Wrong result for SELECT..WHERE HEX(date_column)!='323030312D30312D3031' AND date_column='2001-01-01x'

The fix for MDEV-8749 also fixed MDEV-8742.
Just adding the test case from the bug report.

MDEV-8703 Wrong result for SELECT..WHERE LENGTH(decimal_10_1_column)!=3 AND decimal_10_1_column=1.10

Moving to field.cc.

Follow-up for MDEV-6066: new default value, the result file needs to be updated

Suppress errors about not being able to load plugins from file_key_management library.
Errors about the non-existing library are already suppressed globally.

New defaults for query cache caused wrong test output

removing IMPOSSIBLE_RESULT from Item_result, as it's not
needed any more. The fact that an Item is not in a comparison
context is now always designated by IDENTITY_SUBST in Subst_constraint.
Previously IMPOSSIBLE_RESULT and IDENTITY_SUBST co-existed but
actually meant the same thing.

MDEV-8747 Wrong result for SELECT..WHERE derived_table_column='a' AND derived_table_column<>_latin1'A' COLLATE latin1_bin
MDEV-8749 Wrong result for SELECT..WHERE derived_table_enum_column='number' AND derived_table_enum_column OP number

MDEV-8753: 10.1 build is broken: xtradb/handler/ha_innodb.cc:21430: error: redefinition of 'void ib_push_warning(trx_t*, ulint, const char*, ...)'

Fixed bad merge.

Analysis: Server tried to continue reading tablespace using a cursor after
we had resolved that pages in the tablespace can't be decrypted.

Fixed by addind check is tablespace still encrypted.

   MDEV-8588: Assertion failure in file ha_innodb.cc line 21140 if at least one encrypted table exists and encryption service is not available

    Analysis: Problem was that in fil_read_first_page we do find that
    table has encryption information and that encryption service
    or used key_id is not available. But, then we just printed
    fatal error message that causes above assertion.

    Fix: When we open single table tablespace if it has encryption
    information (crypt_data) store this crypt data to the table
    structure. When we open a table and we find out that tablespace
    is not available, check has table a encryption information
    and from there is encryption service or used key_id is not available.
    If it is, add additional warning for SQL-layer.

MDEV-8588: Assertion failure in file ha_innodb.cc line 21140 if at least one encrypted table exists and encryption service is not available

Analysis: Problem was that in fil_read_first_page we do find that
table has encryption information and that encryption service
or used key_id is not available. But, then we just printed
fatal error message that causes above assertion.

Fix: When we open single table tablespace if it has encryption
information (crypt_data) store this crypt data to the table
structure. When we open a table and we find out that tablespace
is not available, check has table a encryption information
and from there is encryption service or used key_id is not available.
If it is, add additional warning for SQL-layer.

cosmetic fixes. test fixes.

MDEV-6066: Merge new defaults from 5.6 and 5.7 (defaults changed, QC can be stopped with no-zero size)

--autoset- command line prefix added

* Start_encryption_log_event
* --encrypt-binlog command line option

based on google patches.

Introduce Log_event_writer() that encapsulates
writing data to an IO_CACHE with automatic checksum calculation.

Now all events properly checksum themselves as needed.

Use Log_event_writer in MYSQL_BIN_LOG::write_cache() instead
of copy-pasting its logic all over.

Later Log_event_writer will also do encryption.

now when my_vsnprintf() supports %llu for a few years already.

commit f1abd015
Author: Andrei Elkin <aelkin@mysql.com>
Date:   Thu Nov 12 17:10:19 2009 +0200

    Bug #47210   first execution of "start slave until" stops too early

introduce DBUG_DUMP_EVENT_BUF,
remove few unused DBUG_EXECUTE_IF's
simplify few DBUG_PRINT's
remove few redundant #ifndef DBUG_OFF's

* replace binlog positions where they are calculated
  (instead of --disable_query_log)
* don't replace binlog positions when they're hard-coded anyway

1. use include/show_binlog_events.inc instead of SHOW BINLOG EVENTS
2. use include/show_relaylog_eventc.inc too
3. in all other places where a number might appear in the result
   file, include binlog_start_pos.inc, calculate the position
   like pos=`select $binlog_start_pos + 100`; and use
   replace_result $pos <pos>

and fix SHOW RELAYLOG 'src_name' EVENTS to respect src_name

* fix unireg.h includes
* use enum_binlog_checksum_alg for binlog checksum variables,
  not uint8

* reformat long lines
* remove useless 'const'
* remove unneeded do { ... } while(false} wrapper
* remove unneeded method