When writing rows with a minimal row image, it is possible to receive
empty events. In that case m_curr_row and m_rows_end are the same,
however the event implies an insert into the table with the default
values associated for that table.

Due to how events are created with a minimal binlog_row_image, it is
possible to receive empty write events because all the columns
in the table have a default value. (For example an auto-increment)
Make sure we account for that.

Update_rows_log_event must make use of the after image bitmap when
detecting which columns to update.

The bitmap is now deduced from the table's read and write set.

The logging function now writes to the binlog according
to the bitmap columns implied by the binlog_row_image variable.

The row events no longer require columns arguments.

When deciding which binlog events are pending, make use of the bitmap
compare function instead.

The function compares bitmaps according to the binlog_row_image variable
setting.

The rpl_injector code is now considered dead code.

This patch only removes the minimum number of function calls
to allow implementing binlog_row_image. The other functions are to be
removed in a subsequent patch.

Depending on which binlog_row_image we are using, we must
mark columns which to update differently both in the before image
as well as the after image.

The system variable is present but it does not do anything yet.

of wsrep_provider_options' value. Also increase the max value
length for SYSTEM_VARIABLES schema table.

Crypt data was used when it was already freed. Delete crypt data
more thorougly when freed.

Analysis: Flush changed page bitmaps calls log_online_follow_redo_log
that later calls log_group_read_log_seg with release_mutex = true
and that causes the log_sys mutex being released before
log_decrypt_after_read function that later required log_sys mutex.

Fix: Enter log_sys mutex before log_decrypt_after_read if mutex
is released and release the mutex after the function if we
acquired it before function call.

Time column of SHOW PROCESSLIST was returned in microseconds after rev. 8f603bcb.
Revert original timescale (seconds).

TDC_element::free_tables_back() had pre-lfhash leftover code, which referenced
TDC_element::free_tables via TDC_element::share. This is not correct as share
may be NULL (newly inserted or to be removed), instead access free_tables
directly.

ORDER BY against union may confuse name resolution context, causing valid
SQL statements to fail.

The purpose of context change was presumably intended for the duration of
gathering field list for ORDER BY. However it isn't actually required (name
resolution context is never accessed by the latter).

See also alternative solution (in MySQL 5.7): 92145b95.

Test create_or_replace should make sure that background decrypt
operation is finished and flush all dirty pages using restart
to clean up the database before ending.

It's now needed outside of Item_bool_func2 any more.

fix two #if MYSQL_VERSION_ID > 100105

SEQ_READ_APPEND is for two threads (reader and writer)
simultaneously accessing the IO_CACHE

Pretend that CREATE TABLE and CREATE TEMPORARY TABLE are
two different commands internally. The user doesn't need
to know that they both are SQLCOM_CREATE_TABLE.

Same for DROP [TEMPORARY] TABLE

* keep all com_xxx constants together in struct system_status_var
* fix an outdated comment in sql_cmd.h
* fix an off-by-one bug in mysqld.cc

as a bonus that makes CREATE TEMPORARY TEMPORARY TABLE illegal

Old code worked because plugin locking guaranteed that
encryption plugin is deinitialized last.
But compiled-in plugins are never locked.

This fixes encryption failures on fulltest builder

* support statically compiled file_key_management when possible
* rename encryption.encryption_create_or_replace -> encryption.create_or_replace
* delete unnecessary *.opt file (including
  have_key_management_plugin.inc is enough)
* remove unnecessary LOWER() for strings that are compared
  case insensitively anyway

Disable sys_vars.all_vars test. There's no need to write
boilerplate tests for every new system variable, our
INFORMATION_SCHEMA.SYSTEM_VARIABLES and sysvar_* tests
are now used to show all basic properties of all variables.