Show outer_ref_condition in EXPLAIN FORMAT=JSON output.

Also fixed race condition in main.connect2 test: we need to wait for
disconnected connections to actually decrease Threads_connected.

This is expected to fix many test failures on 32bit builds where creation of
second temporary table was failing.

        --raw, --stop-never and --stop-never-slave-server-id=id options
        added to the mysqlbinlog tool.

This is an addition to rev. ed990465
Reverted some test cases changes done in MDEV-6150.

Cleanup now unused arguments of tdc_open_view().

Remove tdc_acquire_share() helpers: they don't actually make things simpler.

tdc_assign_new_table_id() does not relate to table cache, move it out of
table_cache.cc.

Compile time assertion "sizeof(struct st_irem) % sizeof(double) == 0" started
to fail on 32bit systems after my_thread_id was changed from ulong to int64.

Fixed by added padding to struct st_irem on 32bit systems.

First thread was getting id 0, while it is intended to get id 1.

Fixed assertion failure introduced along with MDEV-6150 (thd must be unlinked
before calling "delete thd").

It is not permitted to "delete thd" under LOCK_thread_count anymore.

Also, renamed wsrep_skip_append_keys to wsrep_ignore_table.
Test case : galera.galera_as_slave_gtid.test

- "Early NULLs filtering" optimization used to "peel off" Item_ref and
  Item_direct_ref wrappers from an outside column reference before
  adding "outer_table_col IS NOT NULL" into JOIN::outer_ref_cond.
- When this happened in a subquery that was evaluated in a post-GROUP-BY
  context, attempt to evaluate JOIN::outer_ref_cond would fetch an
  incorrect value of outer_table_col.

10.0 merge
10.0-galera merge
connect/10.1 merge

contains broken procedure body when used shielding quotes inside.

  If any given variable the xtrabackup-v2 sst script looks for is specified
  multiple times in cnf file then it tend to pick both of them causing
  some of the follow-up command to fail.

  Avoid this programatic mistake by honoring only the last variable assigned
  setting as done by mysqld too.

  Check https://bugs.launchpad.net/percona-xtradb-cluster/+bug/1362830

Semantics:
---------

* Generally end-user will create a separate user with needed
privileges for
    performing DONOR action.
* This user credentials are specified using wsrep_sst_auth.

* Along with this user there could be other user(s) created on the
server
    that sysadmin may use for normal or other operations
* Credentials for these user(s) can be specified in same
cluster/server
    cnf file as part of [client] section

When cluster act as DONOR and if wsrep_sst_auth is provided then it
should
strictly use it for performing SST based action.

What if end-user has same credentials for performing both SST action
and
normal admin work ?
* Then end-user can simply specify these credentials as part of
[client]
    section in cnf file and skip providing wsrep_sst_auth.

Issue:
-----

MySQL client user/password parsing preference order is as follows:
* command line (through --user/--password)
* cnf file
* MYSQL_PWD enviornment variable.

Recent change tried passing sst user password through MYSQL_PWD
(and user though --user command line param as before).

On the system where-in admin had another user for performing non-SST
actions,
credentials for such user were present in cnf file under [client]
section.

Due to mysql client preference order, SST user name was used (as it
was
passed through command line) but password of other user (meant for
non-SST)
action was being used as it was passed through cnf file.

Password passed through MYSQL_PWD was completely ignored causing
user-name/password mismatch.

Solution:
---------

* If user has specified credentials for SST then pass them through
command
    line so that they are used in priority.

(There could be security concern on passing things through command
line but
   when I tried passing user-name and password through command line to
mysql
   client and then did ps I saw this
   ./bin/mysql --user=sstuser --password=x xxxxxxxx -S /tmp/n1.sock
so seems like password is not shown)

The reason for the assertion failure is that the update statement for
the minimal row image sets only the PK column in the write_set of the
table to true. On the other hand, the trigger aims to update a different
column.

Make sure that triggers update the used columns accordingly, when being
processed.

don't transform Item_func_nullif if it's context_analysis_only

when calculating COUNT(basic_const), take into account that
this basic_const may be NULL

This fixes
MDEV-9538 Server crashes in check_show_access on SHOW STATISTICS
MDEV-9539 Server crashes in make_columns_old_format on SHOW GEOMETRY_COLUMNS
MDEV-9540 SHOW SPATIAL_REF_SYS and SHOW SYSTEM_VARIABLES return empty results with numerous warnings

when doing set_field_to_new_field (from switch_to_nullable_trigger_fields())
make sure that the field we're about to change actually belongs
to the right table (otherwise we cannot dereference new_field[]
array as the wrong table might have more fields than
new_field[] has elements)

Case: table with a NOT NULL field, BEFORE UPDATE trigger,
and UPDATE with a subquery that uses GROUP BY on that
NOT NULL field, and needs a temporary table for it.

Because of the BEFORE trigger, the field becomes nullable
temporarily. But its Item_field (used in GROUP BY) doesn't.
When working with the temptable some code looked at
item->maybe_null, some - at field->null_ptr.
The fix: make Item_field nullable when its field is.

This triggers an assert. The group key size is calculated
before the item is made nullable, so the group key doesn't
have a null byte. The fix: make fields/items nullable
before the group key size is calculated.