modified:   storage/connect/ha_connect.cc
  modified:   storage/connect/user_connect.cc
  modified:   storage/connect/plgdbutl.cpp
  modified:   storage/connect/user_connect.cc

-- Trace work storage allocation and freeing in DEVELOPMENT mode
  modified:   storage/connect/ha_connect.cc
  modified:   storage/connect/jsonudf.cpp
  modified:   storage/connect/plugutil.cpp

  modified:   storage/connect/ha_connect.cc

-- Set NULL false in SetJsonValue
  modified:   storage/connect/jsonudf.cpp
  modified:   storage/connect/tabjson.cpp

  modified:   storage/connect/connect.cc
  modified:   storage/connect/plugutil.cpp
  modified:   storage/connect/jsonudf.cpp

-- Update result from json_udf test
  modified:   storage/connect/mysql-test/connect/r/json_udf.result

   Implement discovery for the MongoDB Java Driver
   Create classes to minimize code and avoid dupicates
   Rearrange and rename implied files
  modified:   storage/connect/CMakeLists.txt
  renamed:    storage/connect/mongofam.cpp -> storage/connect/cmgfam.cpp
  renamed:    storage/connect/mongofam.h -> storage/connect/cmgfam.h
  modified:   storage/connect/cmgoconn.h
  modified:   storage/connect/javaconn.h
  modified:   storage/connect/jdbconn.cpp
  modified:   storage/connect/jmgoconn.cpp
  modified:   storage/connect/jmgoconn.h
  modified:   storage/connect/mongo.cpp
  modified:   storage/connect/mongo.h
  renamed:    storage/connect/tabmgo.cpp -> storage/connect/tabcmg.cpp
  renamed:    storage/connect/tabmgo.h -> storage/connect/tabcmg.h
  modified:   storage/connect/tabjmg.cpp
  modified:   storage/connect/tabjmg.h
  modified:   storage/connect/tabjson.cpp
  modified:   storage/connect/tabjson.h

-- Trace Sarea allocation and freeing
  modified:   storage/connect/connect.cc
  modified:   storage/connect/plugutil.cpp
  modified:   storage/connect/user_connect.cc

-- Null Json values where not mark as null in JSNX::SetJsonValue
   This was added in TYPE_NULL (declared as TYPE_VOID)
  modified:   storage/connect/json.cpp
  modified:   storage/connect/json.h
  modified:   storage/connect/jsonudf.cpp

-- Null JValues are ignored in JSNX::CalculateArray
   Also done in tabjson.cpp for JSONCOL::CalculateArray
  modified:   storage/connect/json.h
  modified:   storage/connect/jsonudf.cpp
  modified:   storage/connect/tabjson.cpp

-- Null JSON values now represented by connect_json_null session variable
  modified:   storage/connect/json.cpp
  modified:   storage/connect/json.h
  modified:   storage/connect/jsonudf.cpp
  modified:   storage/connect/tabjson.cpp

-- JVALUE has size = 1
  modified:   storage/connect/json.h

-- Fix by vuvova because Debian compilation failure.
  modified:   storage/connect/value.cpp

around , and = in the OPTION_LIST.
  modified:   storage/connect/ha_connect.cc

  modified:   storage/connect/ha_connect.cc

- Add catalog table for Mongo java driver tables
  modified:   storage/connect/mongo.cpp
  modified:   storage/connect/mongo.h
  modified:   storage/connect/tabjmg.cpp
  modified:   storage/connect/tabjmg.h

  modified:   storage/connect/CMakeLists.txt
  modified:   storage/connect/JavaWrappers.jar
  modified:   storage/connect/colblk.h
  modified:   storage/connect/filter.cpp
  modified:   storage/connect/filter.h
  modified:   storage/connect/ha_connect.cc
  modified:   storage/connect/ha_connect.h
  modified:   storage/connect/jdbccat.h
  modified:   storage/connect/jdbconn.cpp
  modified:   storage/connect/jdbconn.h
  modified:   storage/connect/mongofam.cpp
  modified:   storage/connect/mongofam.h
  modified:   storage/connect/mycat.cc
  modified:   storage/connect/mycat.h
  modified:   storage/connect/tabext.h
  modified:   storage/connect/tabjdbc.cpp
  modified:   storage/connect/tabjdbc.h
  modified:   storage/connect/tabjson.cpp
  modified:   storage/connect/tabjson.h
  modified:   storage/connect/tabmgo.cpp
  modified:   storage/connect/tabmgo.h
  created:    storage/connect/Mongo2Interface.java
  created:    storage/connect/Mongo3Interface.java
  created:    storage/connect/cmgoconn.cpp
  created:    storage/connect/cmgoconn.h
  created:    storage/connect/javaconn.cpp
  created:    storage/connect/javaconn.h
  created:    storage/connect/jmgfam.cpp
  created:    storage/connect/jmgfam.h
  created:    storage/connect/jmgoconn.cpp
  created:    storage/connect/jmgoconn.h
  created:    storage/connect/mongo.cpp
  created:    storage/connect/mongo.h
  created:    storage/connect/tabjmg.cpp
  created:    storage/connect/tabjmg.h

- tdbp not initialized when catched exception
in CntGetTDB (connect.cc line 188)
  modified:   storage/connect/connect.h

- CheckCleanup should sometimes doing cleanup on pure info
Sometimes MariaDB loops on info to get the size of all tables in a database.
This can sometimes fail by exhausted memory.
CheckCleanup now have a force boolean parameter (defaulting to false)
  modified:   storage/connect/ha_connect.cc
  modified:   storage/connect/user_connect.cc
  modified:   storage/connect/user_connect.h

Change the copyright of some source files
  modified:   storage/connect/connect.cc
  modified:   storage/connect/connect.h
  modified:   storage/connect/engmsg.h
  modified:   storage/connect/global.h
  modified:   storage/connect/ha_connect.cc
  modified:   storage/connect/ha_connect.h
  modified:   storage/connect/msgid.h
  modified:   storage/connect/mycat.cc
  modified:   storage/connect/mycat.h
  modified:   storage/connect/os.h
  modified:   storage/connect/osutil.c
  modified:   storage/connect/osutil.h
  modified:   storage/connect/user_connect.cc
  modified:   storage/connect/user_connect.h

Force type int for ENUMs.
Replace remaining longjmp.
  modified:   storage/connect/array.cpp
  modified:   storage/connect/colblk.cpp
  modified:   storage/connect/connect.cc
  modified:   storage/connect/filter.cpp
  modified:   storage/connect/jdbconn.cpp
  modified:   storage/connect/plgdbutl.cpp
  modified:   storage/connect/tabdos.cpp
  modified:   storage/connect/tabvir.cpp
  modified:   storage/connect/tabxml.cpp
  modified:   storage/connect/value.cpp
  modified:   storage/connect/xobject.cpp

  modified:   storage/connect/tabmgo.cpp
  modified:   storage/connect/tabmgo.h

Added support of NCHAR, NVARCHAR an ROWID JDBC types.
  modified:   storage/connect/jdbconn.cpp

Seems due to making an index on unsigned integer that triggers an
un-handled THROW.
  modified:   storage/connect/tabdos.cpp
  modified:   storage/connect/xindex.cpp

  modified:   storage/connect/ha_connect.cc

  modified:   storage/connect/ha_connect.cc

Update failing test
  modified:   storage/connect/mysql-test/connect/t/secure_file_priv.test

  modified:   storage/connect/ha_connect.cc
  modified:   storage/connect/mongofam.cpp
  modified:   storage/connect/mycat.h
  modified:   storage/connect/tabjson.cpp
  modified:   storage/connect/tabjson.h
  modified:   storage/connect/tabmgo.cpp
  modified:   storage/connect/tabmgo.h

Fix a regression bug in MongoFam
(all = true only when no Options)
  modified:   storage/connect/mongofam.cpp

Fix a regression bug in JsonCol
(in JSONCOL::GetJpath)
  modified:   storage/connect/tabjson.cpp

This is to avoid an error to be reported when executing this command on a CONNECT table.
  modified:   storage/connect/ha_connect.cc

  modified:   storage/connect/mysql-test/connect/r/alter_xml2.result
  modified:   storage/connect/mysql-test/connect/r/infoschema2-9739.result
  modified:   storage/connect/mysql-test/connect/r/xml2_grant.result
  modified:   storage/connect/mysql-test/connect/r/xml2_mdev5261.result
  modified:   storage/connect/mysql-test/connect/r/xml_mdev5261.result
  modified:   storage/connect/mysql-test/connect/t/xml2_mdev5261.test
  modified:   storage/connect/mysql-test/connect/t/xml_mdev5261.test

  modified:   storage/connect/mysql-test/connect/r/alter_xml2.result
  modified:   storage/connect/mysql-test/connect/r/infoschema2-9739.result
  modified:   storage/connect/mysql-test/connect/r/xml2_mdev5261.result

  modified:   storage/connect/ha_connect.cc

Update tests to reflect recent changes, in particular new Jpath syntax
  modified:   storage/connect/ha_connect.cc
  modified:   storage/connect/mysql-test/connect/r/alter_xml.result
  modified:   storage/connect/mysql-test/connect/r/bin.result
  modified:   storage/connect/mysql-test/connect/r/dir.result
  modified:   storage/connect/mysql-test/connect/r/grant.result
  modified:   storage/connect/mysql-test/connect/r/grant2.result
  modified:   storage/connect/mysql-test/connect/r/infoschema-9739.result
  modified:   storage/connect/mysql-test/connect/r/ini_grant.result
  modified:   storage/connect/mysql-test/connect/r/jdbc_new.result
  modified:   storage/connect/mysql-test/connect/r/mysql_discovery.result
  modified:   storage/connect/mysql-test/connect/r/mysql_exec.result
  modified:   storage/connect/mysql-test/connect/r/mysql_grant.result
  modified:   storage/connect/mysql-test/connect/r/mysql_new.result
  modified:   storage/connect/mysql-test/connect/r/unsigned.result
  modified:   storage/connect/mysql-test/connect/r/upd.result
  modified:   storage/connect/mysql-test/connect/r/xml.result
  modified:   storage/connect/mysql-test/connect/r/xml_grant.result
  modified:   storage/connect/mysql-test/connect/r/xml_html.result
  modified:   storage/connect/mysql-test/connect/r/xml_mdev5261.result
  modified:   storage/connect/mysql-test/connect/r/xml_mult.result
  modified:   storage/connect/mysql-test/connect/r/xml_zip.result
  modified:   storage/connect/mysql-test/connect/t/alter_xml.test
  modified:   storage/connect/mysql-test/connect/t/dir.test
  modified:   storage/connect/mysql-test/connect/t/infoschema-9739.test
  modified:   storage/connect/mysql-test/connect/t/jdbc_new.test
  modified:   storage/connect/mysql-test/connect/t/mysql_exec.test
  modified:   storage/connect/mysql-test/connect/t/mysql_new.test
  modified:   storage/connect/mysql-test/connect/t/unsigned.test
  modified:   storage/connect/mysql-test/connect/t/upd.test
  modified:   storage/connect/mysql-test/connect/t/xml.test
  modified:   storage/connect/mysql-test/connect/t/xml_grant.test
  modified:   storage/connect/mysql-test/connect/t/xml_html.test
  modified:   storage/connect/mysql-test/connect/t/xml_mdev5261.test
  modified:   storage/connect/mysql-test/connect/t/xml_mult.test
  modified:   storage/connect/mysql-test/connect/t/xml_zip.test

when NO MONGO support. (tdb->Uri is uninitialized)
  modified:   storage/connect/tabjson.cpp

  modified:   storage/connect/array.cpp
  modified:   storage/connect/array.h
  modified:   storage/connect/blkfil.cpp
  modified:   storage/connect/blkfil.h
  modified:   storage/connect/block.h
  modified:   storage/connect/colblk.cpp
  modified:   storage/connect/colblk.h
  modified:   storage/connect/csort.h
  modified:   storage/connect/filamvct.cpp
  modified:   storage/connect/filter.cpp
  modified:   storage/connect/filter.h
  modified:   storage/connect/global.h
  modified:   storage/connect/json.h
  modified:   storage/connect/plgdbsem.h
  modified:   storage/connect/plgdbutl.cpp
  modified:   storage/connect/tabcol.cpp
  modified:   storage/connect/tabcol.h
  modified:   storage/connect/tabdos.cpp
  modified:   storage/connect/tabdos.h
  modified:   storage/connect/tabjson.cpp
  modified:   storage/connect/table.cpp
  modified:   storage/connect/tabodbc.cpp
  modified:   storage/connect/tabodbc.h
  modified:   storage/connect/tabsys.h
  modified:   storage/connect/tabxml.h
  modified:   storage/connect/value.cpp
  modified:   storage/connect/value.h
  modified:   storage/connect/xindex.cpp
  modified:   storage/connect/xindex.h
  modified:   storage/connect/xobject.cpp
  modified:   storage/connect/xobject.h
  modified:   storage/connect/xtable.h

Set values as nullable when retrieving catalog info
  modified:   storage/connect/jdbconn.cpp
  modified:   storage/connect/mysql-test/connect/r/odbc_oracle.result
  modified:   storage/connect/odbconn.cpp

Change format of Jpath
  modified:   storage/connect/json.cpp
  modified:   storage/connect/jsonudf.cpp
  modified:   storage/connect/mysql-test/connect/r/json.result
  modified:   storage/connect/mysql-test/connect/r/json_udf.result
  modified:   storage/connect/mysql-test/connect/r/json_udf_bin.result
  modified:   storage/connect/mysql-test/connect/r/zip.result
  modified:   storage/connect/mysql-test/connect/t/json.test
  modified:   storage/connect/mysql-test/connect/t/json_udf.test
  modified:   storage/connect/mysql-test/connect/t/json_udf_bin.test
  modified:   storage/connect/mysql-test/connect/t/zip.test
  modified:   storage/connect/tabjson.cpp
  modified:   storage/connect/tabjson.h
  modified:   storage/connect/tabmgo.cpp

Change null representation from ??? to <null>
  modified:   storage/connect/json.cpp

Change the name of UDF that are equal to a native JSON function name
  modified:   storage/connect/jsonudf.cpp
  modified:   storage/connect/jsonudf.h
  modified:   storage/connect/mysql-test/connect/t/json_udf.inc
  modified:   storage/connect/mysql-test/connect/t/json_udf2.inc

Fix bug in making JSON project info
  modified:   storage/connect/mongofam.cpp

Fix COMPUTE when one argument is null
  modified:   storage/connect/value.cpp

Value is null only when nullable
  modified:   storage/connect/value.h

The issue was that my_errno was not set properly when a repair was killed,
which confused the rpl_killed_ddl script.

I also added an extra test line in varchar.inc to ensure we don't give
duplicate error rows.

In 10.2, the definition of simple_counter resides in the file
sync0types.h, not in the file os0sync.h which has been removed.

There is a race condition related to the variable
srv_stats.n_lock_wait_current_count, which is only
incremented and decremented by the function lock_wait_suspend_thread(),

The incrementing is protected by lock_sys->wait_mutex, but the
decrementing does not appear to be protected by anything.
This mismatch could allow the counter to be corrupted when a
transactional InnoDB table or record lock wait is terminating
roughly at the same time with the start of a wait on a
(possibly different) lock.

ib_counter_t: Remove some unused methods. Prevent instantiation for N=1.
Add an inc() method that takes a slot index as a parameter.

single_indexer_t: Remove.

simple_counter<typename Type, bool atomic=false>: A new counter wrapper.
Optionally use atomic memory operations for modifying the counter.
Aligned to the cache line size.

lsn_ctr_1_t, ulint_ctr_1_t, int64_ctr_1_t: Define as simple_counter<Type>.
These counters are either only incremented (and we do not care about
losing some increment operations), or the increment/decrement operations
are protected by some mutex.

srv_stats_t::os_log_pending_writes: Document that the number is protected
by log_sys->mutex.

srv_stats_t::n_lock_wait_current_count: Use simple_counter<ulint, true>,
that is, atomic inc() and dec() operations.

lock_wait_suspend_thread(): Release the mutexes before incrementing
the counters. Avoid acquiring the lock mutex if the lock wait has
already been resolved. Atomically increment and decrement
srv_stats.n_lock_wait_current_count.

row_insert_for_mysql(), row_update_for_mysql(),
row_update_cascade_for_mysql(): Use the inc() method with the trx->id
as the slot index. This is a non-functional change, just using
inc() instead of add(1).

buf_LRU_get_free_block(): Replace the method add(index, n) with inc().
There is no slot index in the simple_counter.

This was because of two issues:
- thr_multi_lock_after_thr_lock needed to be hit 3 times before go2 could
  be signaled, because 2 of these happened before statistics_update_start
  was reached.
- The original code didn't take into accunt that thr_locks can be executed in
  any random order, which caused sporadic failures when waiting for 1 lock
  of 3, as if the locks where in different order, there would be a dead-lock.
  Fixed by introducing thr_multi_lock_before_thr_lock which is deterministic.
- Some of the test failures where not noticed as the DEBUG_SYNC timeout
  would cause the test to pass (after 300 seconds).

MDEV-11197: TrxInInnoDB::is_aborted(const trx_t*): Assertion `srv_read_only_mode || trx->in_depth > 0' failed

TrxInInnoDB should be constructed to track if a transaction is executing
inside InnoDB code i.e. it is like a gate between Server and InnoDB
::rnd_next() is called from Server and thus construct TrxInInnoDB
also there.

Applied suggested clean-up to TrxInInnoDB class functions enter()
and exit(). Note that exactly original did not work for enter().

The InnoDB temporary tablespace is only usable if innodb_read_only=OFF.
It is useless to create the tablespace in read-only mode, because
CREATE TEMPORARY TABLE is disallowed if innodb_read_only, and nothing
can we written to the temporary tablespace if no temporary tables
can be created.

fix sporadic innodb.truncate_purge_debug failures