It tests SQL-level feature that is available in FB/MySQL and not in MariaDB

Remove trailing white space, and use lower case for "eval" and "let".
Add an "End of 10.2 tests" marker to ease future merges.

The relevant InnoDB/XtraDB fixes up to 5.6.42 had already
been applied to MariaDB in commit 30c3d6db.

Revert some changes that appeared in
the merge commit 87d852f1.

Problem affects INPLACE ALTER rename columns.

innobase_rename_column_try(): some strcmp() was replaced with my_strcasecmp(),
queries to update data dictionary was updated to not match column name case.

MDEV-17349 Assertion `!table || (!table->read_set || bitmap_is_set(table->read_set, field_index))' failed on concurrent SELECT and DELETE after RENAME from table with index on virtual column

Race condition. field->flags were copied from s->field->flags during
field->clone(), early in open_table_from_share(). But s->field->flags
were getting their PART_INDIRECT_KEY_FLAG bit much later in
TABLE::mark_columns_used_by_virtual_fields() and only once per share.

If two threads were executing the code between field->clone()
and mark_columns_used_by_virtual_fields() at the same time, only
one would get PART_INDIRECT_KEY_FLAG bits in field[].

LOCK view WRITE shouldn't block FLUSH view.
So we set the view's mdl_request type to it's tables.

thd_rpl_stmt_based(): A new predicate to check if statement-based
replication is active. (This can also hold when replication is not
in use, but binlog is.)

que_thr_stop(), row_ins_duplicate_error_in_clust(),
row_ins_sec_index_entry_low(), row_ins(): On a duplicate key error,
only lock all index records when statement-based replication is in use.

Users expect window functions to produce a certain ordering of rows in
the final result set. Although the standard does not require this, we
already have the filesort result done for when we computed the window
function. If there is no ORDER BY attached to the query, just keep it
till the SELECT is completely evaluated and use that to print the
result.

Update test cases as many did not take care to guarantee a stable
result.

set both `password` and `authentication_string` columns in `mysql`.`user`
table for now.

Suppress the "password was ignored" warning if the password is
the same as the authentication string

 which did not always correctly simulated io-cache::end_of_file.
The error was caused by implicit cast to unsigned of an intemediate term
in a formula.

The parameters bool sync=true, bool read_only=false of mtr_t::start()
were added in
https://github.com/mysql/mysql-server/commit/eca5b0fc17a5bd6d4833d35a0d08c8549dd3b5ec
(MySQL 5.7.3).

The parameter read_only was never used anywhere.
The parameter sync was only copied around, and would be returned
by the unused function mtr_t::is_async().

We do not need this dead code in MariaDB.

At the start of the function, we already dereferenced node,
so the checks for NULL are unnecessary and redundant.

For index merge union[or sort union], the estimates are not taken into account while calculating the selectivity of
a condition. So instead of showing the estimates of the index merge union[or sort union], it shows estimates equal to
all the records of the table.
The fix for the issue is to include the selectivity of index merge
union[or sort union] while calculating the selectivity of a condition.

branch.

Query INFORMATION_SCHEMA.INNODB_SYS_TABLES only once, and cache results.

As a small cleanup, remove  mdl_lock_con_mutex, the MDL handling
connection is never accessed by multiple threads at the same time.

--gdb now accepts an argument, it will be passed to gdb as a command.
multiple commands can be separated by a (non-standard and not escapable)
delimiter - semicolon (;).

Old usage with a bare --gdb continues to work too, of course.

Cherry-picked c47c0ca5 5441bbd3 339b9055

We should clear trailing zeroes in frac part. Otherwise
that tail is growing quickly and forces unnecessary truncating of
arguments.

row_drop_table_for_mysql(): Avoid accessing non-existing dictionary tables.

dict_create_or_check_foreign_constraint_tables(): Add debug instrumentation
for creating and dropping a table before the creation of any non-core
dictionary tables.

trx_purge_add_update_undo_to_history(): Adjust a debug assertion, so that
it will not fail due to the test instrumentation.

Also change Jira link to actual domain. The mariadb.org/jira web server redirect
might not be maintained at some point.

row_drop_table_for_mysql(): Avoid accessing non-existing dictionary tables.

dict_create_or_check_foreign_constraint_tables(): Add debug instrumentation
for creating and dropping a table before the creation of any non-core
dictionary tables.

trx_purge_add_update_undo_to_history(): Adjust a debug assertion, so that
it will not fail due to the test instrumentation.