generate_derived_keys_for_table() did not work correctly in the case where
- it had a potential index on derived table
- however, TABLE::check_tmp_key() would disallow creation of this index 
  after looking at its future key parts (because of the key parts exceeding 
  max. index length)
- the code would leave a KEYUSE structure that refers to a non-existant index.
  Depending on further optimizer calculations, this could cause a crash. 

MDEV-7150 Wrong auto increment values on INSERT .. ON DUPLICATE KEY UPDATE when the inserted columns include NULL in an auto-increment column

when restoring auto-inc value in INSERT ... ON DUPLICATE KEY UPDATE, take into account that
1. it may be changed in the UPDATE clause (old code did that)
2. it may be changed in the INSERT clause and then cause a dup key (old code missed that)

Item_ident fixed to allow double cleanup().

MDEV-6855 Assertion `cond_type == Item::FUNC_ITEM' failed in check_group_min_max_predicates with GROUP BY, aggregate in WHERE SQ, multi-part key


mysql-test/r/group_by.result:
  Test for MDEV-6855
mysql-test/t/group_by.test:
  Test for MDEV-6855
sql/item.h:
  Fixed spelling error
sql/opt_range.cc:
  Added handling of cond_type == Item::CACHE_ITEM in WHERE clauses for MIN/MAX optimization.
  Fixed indentation

There was a bug in lock handling when mixing INSERT ... SELECT on the same table.


mysql-test/suite/maria/insert_select.result:
  Test case for MDEV_4010
mysql-test/suite/maria/insert_select.test:
  Test case for MDEV_4010
mysys/thr_lock.c:
  We wrongly alldoed TL_WRITE_CONCURRENT_INSERT when there was a TL_READ_NO_INSERT lock

mysql-test/r/kill-2.result:
  test case for MDEV-6896
mysql-test/t/kill-2-master.opt:
  test case for MDEV-6896
mysql-test/t/kill-2.test:
  test case for MDEV-6896
sql/sql_parse.cc:
  Use host_or_ip instead of host as host may be 0

MDEV-6871 Multi-value insert on MyISAM table that makes slaves crash (when using --skip-external-locking=0)
Problem was that repair() did lock and unlock tables, which leaved already locked tables in wrong state

include/my_check_opt.h:
  Added option T_NO_LOCKS to disable locking during repair()
  Fixed duplicated bit T_NO_CREATE_RENAME_LSN
mysql-test/suite/rpl/r/myisam_external_lock.result:
  Test case for MDEV-6871
mysql-test/suite/rpl/t/myisam_external_lock-slave.opt:
  Test case for MDEV-6871
mysql-test/suite/rpl/t/myisam_external_lock.test:
  Test case for MDEV-6871
storage/maria/ha_maria.cc:
  Don't lock tables during enable_indexes()
  Removed some calls to current_thd
storage/myisam/ha_myisam.cc:
  Don't lock tables during enable_indexes()
  Removed some calls to current_thd

On PPC64 high-loaded server may crash due to assertion failure in InnoDB
rwlocks code.

This happened because load order between "recursive" and "writer_thread"
wasn't properly enforced.

Problem is that there could be undo slots from previous runs.

Problem is that on Windows command "perl" failed with error: 255  my_errno: 0  errno: 0.
Do not run on Windows.

Applied the fix previously pushed into 10.0. 
Initial Jan's commit comment:
Problem is that test could open Microsoft C++ Client Debugger
windows with abort exception. Lets not try to test this on
windows.

Thanks to Daniel Black.

            server

This is an addition to original patch. Added full memory barrier to ensure
proper StoreLoad order between waiters and lock_word on PPC64.

Use traditional statistics estimation by default (innodb-stats-traditional=true).
There could be performance regression for customers if there is a lot of
open table operations.

This came with the upgrade from yassl 2.3.0 to 2.3.4 -
ssl tests started to hang on Windows. Comparing and removing changes
I've got to this:

 void input_buffer::set_current(uint i) 
 {
-    if (i)
-        check(i - 1, size_); 
-    current_ = i; 
+    if (error_ == 0 && i && check(i - 1, size_) == 0)
+        current_ = i;
+    else
+        error_ = -1;
 }

in 2.3.0 i==0 was only used to avoid the check, in 2.3.4 it's an error.
but there are places in the code that do set_current(0) and others that
do, like, { before=get_current(); ...; set_current(before); } - and the
initial value of current_ is 0.

So, I suspect that set_current(0) should not be an error, but it should
only skip the check().

followup:
* explicitly disable SSLv2 and SSLv3, keep other protocols enabled
* fix a compiler warning
* rename the test and combinations to avoid confusion

vio/viossl.c:
  fix a compiler warning

innodb_stats_sample_pages

Analysis: If you set the number of analyzed pages 
to very low number compared to actual pages on 
that table/index it randomly pics those pages 
(default 8 pages), this leads to fact that query 
after analyze table returns different results. If 
the index tree is small, smaller than 10 * 
n_sample_pages + total_external_size, then the 
estimate is ok. For bigger index trees it is 
common that we do not see any borders between 
key values in the few pages we pick. But still 
there may be n_sample_pages different key values, 
or even more. And it just tries to 
approximate to n_sample_pages (8).

Fix: (1) Introduced new dynamic configuration variable
innodb_stats_sample_traditional  that retains
the current design. Default false.

(2) If traditional sample is not used we use
n_sample_pages = max(min(srv_stats_sample_pages,
                         index->stat_index_size),
                     log2(index->stat_index_size)*
                          srv_stats_sample_pages);

(3) Introduced new dynamic configuration variable
stat_modified_counter (default = 0) if set
sets lower bound for row updates when statistics is re-estimated.

If user has provided upper bound for how many rows needs to be updated
before we calculate new statistics we use minimum of provided value
and 1/16 of table every 16th round. If no upper bound is provided
(srv_stats_modified_counter = 0, default) then calculate new statistics
if 1 / 16 of table has been modified
since the last time a statistics batch was run.
We calculate statistics at most every 16th round, since we may have
a counter table which is very small and updated very often.
@param t table
@return true if the table has changed too much and stats need to be
recalculated
*/
#define DICT_TABLE_CHANGED_TOO_MUCH(t) \
	((ib_int64_t) (t)->stat_modified_counter > (srv_stats_modified_counter ? \
	ut_min(srv_stats_modified_counter, (16 + (t)->stat_n_rows / 16)) : \
		16 + (t)->stat_n_rows / 16))

The bug was that full memory barrier was missing in the code that ensures that
a waiter on an InnoDB mutex will not go to sleep unless it is guaranteed to be
woken up again by another thread currently holding the mutex. This made
possible a race where a thread could get stuck waiting for a mutex that is in
fact no longer locked. If that thread was also holding other critical locks,
this could stall the entire server. There is an error monitor thread than can
break the stall, it runs about once per second. But if the error monitor
thread itself got stuck or was not running, then the entire server could hang
infinitely.

This was introduced on i386/amd64 platforms in 5.5.40 and 10.0.13 by an
incorrect patch that tried to fix the similar problem for PowerPC.

This commit reverts the incorrect PowerPC patch, and instead implements a fix
for PowerPC that does not change i386/amd64 behaviour, making PowerPC work
similarly to i386/amd64.

change SSL methods to be SSLv23 (according to openssl manpage:
"A TLS/SSL connection established with these methods may understand
the SSLv2, SSLv3, TLSv1, TLSv1.1 and TLSv1.2 protocols") from
TLSv1 methods, that go back to the initial SSL implementation
in MySQL in 2001.

OpenSSL default ciphers are different if TLSv1.2 is enabled,
so tests need to take this into account.

e.g. from "error:00000001:lib(0):func(0):reason(1)"
to "error:140830B5:SSL routines:SSL3_CLIENT_HELLO:no ciphers available"

two bugs in mysql_config:
1. flags like -Werror=format were not stipped out
2. one-pass s/// command was used that could not remove all matching flags
   (e.g. s/ A */ /g cannot remove all A's in " 1 2 A A A A A 4 5 ")

MDEV-4513 Valgrind warnings (Conditional jump or move depends on uninitialised value) in inflate on UNCOMPRESS

MDEV-6789 segfault in Item_func_from_unixtime::get_date on updating table with virtual columns

* prohibit VALUES in partitioning expression
* prohibit user and system variables in virtual column expressions
* fix Item_func_date_format to cache locale (for %M/%W to return the same as MONTHNAME/DAYNAME)
* fix Item_func_from_unixtime to cache time_zone directly, not THD (and not to crash)
* added tests for other incorrectly allowed (in vcols) functions to see that they don't crash

MDEV-3940 Server crash or assertion `item->type() == Item::STRING_ITEM' failure on LOAD DATA through a view with statement binary logging

A "field" could be either an Item_field or
(if loading into a view) an Item_direct_ref that references Item_field.

Also: when iterating fields, use fields of the TABLE_LIST (table or view),
not fields of a TABLE (actual underlying table - might have more columns).