take into account that the list of equal items in
an Item_equal object may contain items with type() == REF_ITEM.

The rdiff file needed to be adjusted after changes made in scope of MDEV-9864

for materialized views and derived tables: there were no
push-down if the view was defined as union of selects
without aggregation. Added test cases with such unions.

Adjusted result files after the merge of the code for mdev-9197.

Ability to print lock type added.
Restoring correct lock type for CREATE VIEW added.

Modifying innodb_ctype_ldml.test related files to take into account
the previous commit changes.

- Moving detection of the MY_CS_CSSORT, MY_CS_PUREASCII, MY_CS_NONASCII
  flags of loadable collations from add_collation() in mysys.c
  to my_cset_init_8bit() and my_coll_init_simple() in ctype-simple.c.

- Adding tests that these flags are set properly for loadable collations

- Moving LDML test related *.xml files from mysql-test/std_data/
  to mysql-test/std_data/ldml/, as there will be more *.xml test files

Do not push conditions into recursive with tables.

Adjusted one result file.

parallel replication

to know what goes wrong.
rpl_parallel_conflicts now contains the tests that
can cause row conflicts in replication.

into branch 10.2-mdev9197.

Recent commits has added new variables and changed the default
for server-id, which caused the patch in rdiff to no longer apply.

Postreview fixes.
New MySQL tests fixes.

Transaction tracker

System variables tracking

initial commit to test

Markdown README for a prettier github representation

Added comments.
Added reaction for exceeding maximum number of elements in with clause.
Added a test case to check this reaction.
Added a test case where the specification of a recursive table
uses two non-recursive with tables.

- Sometimes privilege_table_io printed double rows of roles_mapping
  - Fixed by forcing restart of server when running test
- Wsrep_cluster_address_basic failed in some combinations because
  wsrep_cluster_address was set to NULL
  - Fixed by ensuring it's never set to NULL, only empty string

This makes it easier to setup master as on only have to set --log-bin.
Before this patch if one did set up the master with just --log-bin, slaves
could not connect until server_id was set on the master, which could be
both confusing and hard to do.

- When waiting for events, start time is now counted from start of wait
- Instead of having "Connect" as "Command" for all replication threads we
  now have:
  - Slave_IO for Slave thread reading relay log
  - Slave_SQL for slave executing SQL commands or distribution queries to
    Slave workers
  - Slave_worker for slave threads executin SQL commands in parallel replication