This patch for MDEV-12770 is also fixing:

MDEV-12769 Arithmetic operators with temporal types create excessive column types

- SETVAL(sequence_name, next_value, is_used, round)
- ALTER SEQUENCE, including RESTART WITH

Other things:
- Added handler::extra() option HA_EXTRA_PREPARE_FOR_ALTER_TABLE to signal
  ha_sequence() that it should allow write_row statments.
- ALTER ONLINE TABLE now works with SEQUENCE:s

Other things
- Ensure that ut_d() is set to EXPR if ut_ad() is DEBUG_ASSERT()
  If not, we will get a crash in purge_sys_t::~purge_sys_t() as
  this ut_ad() code expect's that the ut_d() codes has been executed

Adding "const" qualifier to Item::cols(), and to the "Item *cmp" parameter to Type_handler::make_const_item_for_comparison()

This gives better performance, as excludes handler-by-type lookup.

This is a join patch fixing these two bugs:
MDEV-12560 Wrong data type for SELECT NULL UNION SELECT Point(1,1)
MDEV-12665 Hybrid functions do not preserve geometry type

Port of mysql changeset by Georgi Kodinov <Georgi.Kodinov@Oracle.com>:

    Bug #34325 : --add-drop-trigger option for mysqldump

    Implemented the --add-drop-trigger option to prepend each
    CREATE TRIGGER in the dump file with DROP TRIGGER.
    The option is off by default. Added a test case.

Fixing result set metadata for Item_int to match type_handler(),
i.e. MYSQL_TYPE_LONG for small numbers and MYSQL_TYPE_LONGLONG for big numbers.

The new 10.2 has log-slow-admin-statements ON but log-slow-queries OFF,
thus  there is no reason for a warning about it(the change was "by design")

Making sql_yacc.yy close to sql_yacc_ora.yy:

1. Adding struct sp_cursor_name_and_offset into %union
2. Adding field_type_numeric, field_type_string,  field_type_lob,
   field_type_temporal, field_type_misc
3. Adding keyword_sp_data_type and keyword_sp_not_data_type
4. Removing "opt_savepoint". Moving this grammar to "rollback" instead.
   This fixes one shift/reduce conflict.
5. Minor indentation cleanup.

The usage of windows functions when all tables were optimized away
by min/max optimization were not supported. As result a result,
the queries that used window functions with min/max aggregation
over the whole table returned wrong result sets.
The patch fixed this problem.

Removing duplication:
- fix_length_and_dec()
- tmp_value
- lpad_str, rpad_str -> pad_str

(from: http://buildbot.askmonty.org/buildbot/builders/p8-rhel6-bintar/builds/820/steps/test/logs/stdio)

Errors like the following indicate a potential endian storage issue:

rocksdb.rocksdb_range                    w1 [ fail ]
        Test ended at 2017-04-27 18:56:11

CURRENT_TEST: rocksdb.rocksdb_range
--- /home/buildbot/maria-slave/p8-rhel6-bintar/build/storage/rocksdb/mysql-test/rocksdb/r/rocksdb_range.result	2017-04-27 17:41:27.740050347 -0400
+++ /home/buildbot/maria-slave/p8-rhel6-bintar/build/storage/rocksdb/mysql-test/rocksdb/r/rocksdb_range.reject	2017-04-27 18:56:11.230050346 -0400
@@ -25,15 +25,15 @@
 select * from t2 force index (a) where a=0;
 pk	a	b
 0	0	0
-1	0	1
-2	0	2
-3	0	3
-4	0	4
-5	0	5
-6	0	6
-7	0	7
-8	0	8
-9	0	9
+16777216	0	1
+33554432	0	2
+50331648	0	3
+67108864	0	4
+83886080	0	5
+100663296	0	6
+117440512	0	7
+134217728	0	8
+150994944	0	9
 # The rest are for code coverage:
 explain
 select * from t2 force index (a) where a=2;
@@ -41,23 +41,23 @@
 1	SIMPLE	t2	ref	a	a	4	const	#
 select * from t2 force index (a) where a=2;
 pk	a	b
-20	2	20
-21	2	21
-22	2	22
-23	2	23
-24	2	24
-25	2	25
-26	2	26
-27	2	27
-28	2	28
-29	2	29
+335544320	2	20
+352321536	2	21
+369098752	2	22
+385875968	2	23
+402653184	2	24
+419430400	2	25
+436207616	2	26
+452984832	2	27
+469762048	2	28
+486539264	2	29
 explain
 select * from t2 force index (a) where a=3 and pk=33;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	const	a	a	8	const,const	#
 select * from t2 force index (a) where a=3 and pk=33;
 pk	a	b
-33	3	33
+553648128	3	33
 select * from t2 force index (a) where a=99 and pk=99;
 pk	a	b
 select * from t2 force index (a) where a=0 and pk=0;
...
Signed-off-by: Daniel Black <daniel.black@au.ibm.com>

        Flags are wrongly set for MBR_CONTAINS/MBR_WITHIN functions.

MDEV-12363 Assertion `0' failed in Type_handler_string_result::make_sort_key(uchar*, Item*, const SORT_FIELD_ATTR*, Sort_param*).

        maybe_null wasn't properly set for Item_json_func_keys.

json_find_path.

        The ..[0] path can be treated wrong on second json_find_path
        call.

JSON_SEARCH with variables.

        Wrong index for the tmp_paths array in
        Item_func_json_search::val_str.