Don't let network errors from mysql_close() leak into THD.

* remove incorrect upstream fix
** table->in_use can be NULL, must use ha_thd()
** clear_error() may remove earlier errors, don't use it
* fix the bug properly in federated and federatedx

* reduce code duplication
* change int->void for the function that doesn't return an error
* use ha_thd()

fix innodb auto-increment handling
three bugs:
1. innobase_next_autoinc treated the case of current<offset incorrectly
2. ha_innobase::get_auto_increment didn't recalculate current when increment changed
3. ha_innobase::get_auto_increment didn't pass offset down to innobase_next_autoinc

debian/additions/my.cnf sets slow_query_log_file to
/var/log/mysql/mariadb-slow.log.

Update the filename to rotate the slow log file.

Incorrect array lenght for comma buffer.

Analysis: There were two problems. (1) if partition table was
created using lower_case_tables = 1 on windows we did find the
correct table but we did not set share->ib_table correctly.
(2) we did open table on dictionary but did not increase
mysql_open_tables.

Fix: In xtradb allow access to tables with incorrect
lower case names (warning is printed to error log). If
table is opened increase mysql_open_tables count to avoid
crash on flush tables.

Item_func_coalesce::fix_length_and_dec() calls
Item_func::count_string_result_length()) which called agg_arg_charsets()
with wrong flags, so the collation derivation of the COALESCE result was
not properly set to DERIVATION_COERCIBLE. It erroneously stayed
DERIVATION_NUMERIC. So GREATEST() misinterpreted the argument as
a number rather that a string and did not calculate its own length properly.

mysqldump --routine fails to dump databases containing backslash ("\")
character. This happened because escaped database name was being used as an
identifier while changing current database. Such identifers are not supposed
to be escaped, they must be properly quoted instead.

Analysis: debug only assertion I_S function (IS is XtraDB feature) is calling
buf_block_get_frame on any page it reads, which debug-asserts that the page is
buffer-fixed, which is not the case in I_S query.

Fixed by holding the buffer page mutex while the fields are read directly.

Non-select-like queries has no correct JOIN structure connected to top-most SELECT_LEX (and should not).

feedback plugin needs to set tables->select_lex properly

make it possible to change feedback plugin wait intervals
* only in debug builds
* and force the feedback report to be ignored

update the test to use this feature

View/derived fields should be taken into account when we build ref_pointer_array constructed.

DBUG_ASSERTs added to avoid memory overrun.

Improved warning messages by quote marks.

MDEV-8938 Server Crash on Update with joins

Make unique table check after setup_fields of update because unique table can materialize table and we do not need field resolving after materialization.

cherry-picked 7454f1c5 from 10.1

When CHANGE MASTER was executed as a PS, its attributes were wrongly
getting reset toward the end of PREPARE. As a result, the subsequent
executions had no effect. Fixed by making sure that the CHANGE MASTER
attributes are preserved during the lifetime of the PS.

* OSX (mysqlimport freeing unallocated memory)
* Windows (didn't compile MSI)
* fulltest2 (innodb crashes in --embedded --big)

make_cond_for_info_schema() does preserve outer fields

Substitute into transformed subselects original left expression and than register its change in case it was substituted.

MDEV-7565: Server crash with Signal 6 (part 2)

followup test suite and its fix.

Problem was in rewriting left expression which had 2 references on it. Solved with making subselect reference main.

Item_in_optimized can have not Item_in_subselect reference in left part so type casting with no check is dangerous.

Item::cols() should be checked after Item::fix_fields().

Preparation of subselect moved earlier (before checks which needs it prepared).

MDEV-8845: Table disappear after modifying FK

Added test case.

Fixed incorrect access to freed memory.

Made no_rows_in_result()/restore_to_before_no_rows_in_result() not looking
annecessary deep with walk() method.

The patch was pushed into 10.0, but it needs to be applied to 5.5 as well

The test restarts the server and expects that the feedback plugin
will send a report on shutdown, and will write about it in the error
log. But the server is only given 10 sec to shut down properly,
which is not always enough.
Added a parameter to restart_mysqld.inc, and set it to a bigger
value in feedback_plugin_send

The culprit is the feedback_plugin_load test, which is run both separately
and from inside feedback_plugin_send.test. The test queries I_S.FEEDBACK,
and every time it does, 'FEEDBACK used' value is increased.
Fixed by checking that the value is increased instead of recording the actual
value in the result file.

The test would take really long if it was run without --mem.
Fixed by adding --innodb-flush-log-at-trx-commit=2