Provide basic info about sorting/grouping done by the queries.

Add test coverage. The issue itself has been fixed already.

Fix a race in the test case. When we do start_slave.inc immediately
followed by stop_slave.inc, it is possible to kill the IO thread while
it is still running inside get_master_version_and_clock(), and this
gives warnings in the error log that cause the test to fail.

(Based on original patch by Sanja Byelkin)
Make the code that produces JSON output handle LooseScan quick select.

The output we produce is compatible with MySQL 5.6.

The test case was missing --source include/wait_for_binlog_checkpoint.inc.
So it could occasionally fail if the checkpoint managed to occur just at the
right point in time between fetching the two binlog positions to compare.

Follow-up patch with 10.1-specific changes.

Add test cases that more closely resembles the original bug report (which uses
the 10.1-specific --slave-parallel-mode=optimistic).

Also fix the code so that ANALYZE statements are now marked as DDL, and will
not be attempted to speculatively run in parallel with other transactions.

The hangs occur when the group_commit_orderer object is freed before the last
mark_start_commit() call on it - this loses the wakeup to other waiting worker
threads, causing them to hang until killed manually.

The object was freed because wakeup_subsequent_commits() was called two early
in two places. For MDEV-7888, during ANALYZE TABLE, and for MDEV-7929 during
record_gtid() after processing a DDL event. The group_commit_orderer object
can be freed when its last transaction has called wait_for_prior_commit().

Fix by implementing a suspend/resume mechanism for wakeup_subsequent_commits()
that can be used in places where a transaction is committed without this being
the commit of the actual replication event group.

Also add a protection mechanism (that asserts in debug builds) which can
prevent the too-early free and hang if other similar bugs should remain in
other parts of the code.

- JOIN::save_explain_data should also set JOIN::tracker (it already
  sets join_tab[0].tracker). This is needed for UNIONs inside subqueries.

- Remove ANALYZE's timing code off the the execution path of regular
  SELECTs.
- Improve the tracker that tracks counts/execution times of SELECTs or
  DML statements:
  = regular execution just increments counters
  = ANALYZE will also collect timings.

Make the test work on case insensitive FS

mysql.slow_log table has an extra column in 10.1, so the test
table copy should too -- added the column.

Correctly initialize Explain_node::connection_type, remove unused
Explain_node constructor.

MDEV-7918: A number of tests fail in valgrind builder with "InnoDB: Error: Requested state 6 current state 4 old_state 4"

Problem with this state transfer is that different state transfers
are protected with different mutexes.

Print r_rows. There is no table tracking for reading from tmp table, yet.

MDEV-7878: innodb_scrub_background fails sporadically in buildbot (Failing assertion: offset > 0 && offset < UNIV_PAGE_SIZE)

Problem was that when encrypted space was flushed page 0 is
also updated but crypt data offset was sometimes not
calculated.

Conflicts:
	mysql-test/suite/rpl/r/rpl_parallel.result
	sql/rpl_parallel.cc

MDEV-7847: "Slave worker thread retried transaction 10 time(s) in vain, giving up", followed by replication hanging

This patch fixes a bug in the error handling in parallel replication, when one
worker thread gets a failure and other worker threads processing later
transactions have to rollback and abort.

The problem was with the lifetime of group_commit_orderer objects (GCOs).
A GCO is freed when we register that its last event group has committed. This
relies on register_wait_for_prior_commit() and wait_for_prior_commit() to
ensure that the fact that T2 has committed implies that any earlier T1 has
also committed, and can thus no longer execute mark_start_commit().

However, in the error case, the code was skipping the
register_wait_for_prior_commit() and wait_for_prior_commit() calls. Thus
commit ordering was not guaranteed, and a GCO could be freed too early. Then a
later mark_start_commit() would reference deallocated GCO, which could lead to
lost wakeup (causing slave threads to hang) or other corruption.

This patch makes also the error case respect commit order. This way, also the
error case gets the GCO lifetime correct, and the hang no longer occurs.

When a transaction in parallel replication needs to retry (eg. because of
deadlock kill), first wait for all prior transactions to commit before doing
the retry. This way, we avoid the retry once again conflicting with a prior
transaction, requiring yet another retry.

Without this patch, we saw "in the wild" that transactions had to be retried
more than 10 times to succeed, which exceeds the default
--slave_transaction_retries value and is in any case undesirable.

(We already do this in 10.1 in "optimistic" parallel replication mode; this
patch just makes the code use the same logic for "conservative" mode (only
mode in 10.0)).

making Item_string::is_cs_specified() virtual instead.

MDEV-7874 deb package installation fails with "dpkg: dependency problems prevent configuration of mariadb-server"

Added usr/share/mysql/maria_add_gis_sp_bootstrap.sql to the file lists

Tracking total time added in UPDATE/DELETE
Fixed selectivity calculation in UPDATE/DELETE
Macro definitions of time tracting fixed.

MDEV-6218 Wrong result of CHAR_LENGTH(non-BMP-character) with 3-byte utf8
- Moving get_text() as a method to Lex_input_stream.
- Moving the unescaping part into a separate function,
  this piece of code will later go to /strings most likely.
- Removing Lex_input_string::yytoklen, as it's not needed any more.