calc_field_event_length(): For type=MYSQL_TYPE_BLOB and meta==0,
return 0 instead of *ptr+1. This was noted by -Wimplicit-fallthrough.

(fix and explanation came with MDEV-20753 (duplicate of this bug))

Do not try to push down conditions to engine if query was resolved without tables (and so the engine).

Fix rpl_skip_error test.
  We cant reset Slave_skipped_errors(even with FLUSH STATUS), So instead
of absolute slave_skipped_errors we look for delta of slave_skipped_errors
Fix rpl.rpl_binlog_errors and binlog_encryption.rpl_binlog_errors
  We create the $load_file and $load_file2 but we never remove them.
Fix rpl_000011.test
  Instead of real value use delta value , Since flush status wont flush
LONGLONG variable.
Fix rpl_row_find_row_debug
  Instead of searching whole log_error_ file we will use search_pattern_in_file
which runs pattern search only on latest test run , instead of full file.
Fix rpl_ip_mix rpl_ip_mix2
  We should call reset slave all because we also want to reset master_host
otherwise show slave status wont be empty and making repeat N a failure.
Fix rpl_rotate_logs
  First we have to remove master.info file (cleanup) and second we have to
call reset slave all because if we do not call reset slave all then we wont
read master.info file beacuse we already have master config in memory.
And this makes start slave to pass , which shoud fail becuase its permision
is 000
Fix circular_serverid0 test
  The reason is that ++dbug_rows_event_count == 2 in queue_event does
not take --repeat into account. So I have reseted the dbug_rows_event_count
in if body.

calc_field_event_length should accurately calculate the size of BLOB type
fields, Instead of returning just the bytes taken by length it should return
length bytes + actual length.

As it is included from my_global.h already.

This applies to large allocations.

This maps to the way Linux does it in MDEV-10814 except FreeBSD uses
different constants.

Adjust error string to match to implementation.

Tested on FreeBSD-12.0

Make the skip_key a bit faster.

First character of the key name is just skipped, so the escapement
wasn't handled properly.

For release builds, do not declare unused variables.

unpack_row(): Omit a debug-only variable from WSREP diagnostic message.

create_wsrep_THD(): Fix -Wmaybe-uninitialized for the PSI_thread_key.

MDEV-20645: Replication consistency is broken as workers miss the error notification from an earlier failed group.

Analysis:
========
In general if there are three groups.
1 - Inserts 32 which fails due to local entry '32' on slave.
2 - Inserts 33
3 - Inserts 34

Each group considers itself as a waiter and it waits for prior group 'waitee'.
This is done in 'register_wait_for_prior_event_group_commit'. If there is no
other parallel group being scheduled then no waitee will be there.

Let us assume 3 groups are being scheduled in parallel.

3-> waits for 2-> waits for->1

'1' upon completion it checks is there any registered subsequent waiter. If
so it wakes up the subsequent waiter with its execution status. This execution
status is stored in wakeup_error.

If '1' failed then it sends corresponding wakeup_error to 2. Then '2' aborts
and it propagates error to '3'.  So all further commits are aborted.  This
mechanism works only when all transactions reach a stage where they are
waiting for their prior commit to complete.

In case of optimistic following scenario occurs.

1,2,3 are scheduled in parallel.

3 - Reaches group_commit_code waits for 2 to complete.
1 - errors out sets stop_on_error_sub_id=1.

When a group execution results in error its corresponding sub_id is set to
'stop_on_error_sub_id'. Any new groups queued for execution will check if
their sub_id is > stop_on_error_sub_id.  If it is true their execution will be
skipped as prior group execution failed.  'skip_event_group=1' will be set.
Since the execution of SQL thread is about to stop we just skip execution of
all the following event groups.  We still do all the normal waiting and wakeup
processing between the event groups as a simple way to ensure that everything
is stopped and cleaned up correctly.

Upon error '1' transaction checks for registered waiters. Since no one is
there it simply goes away.

2 - Starts the execution. It checks do I have a waitee.

Since wait_commit_sub_id == entry->last_committed_sub_id no waitee is set.

Secondly: 'entry->stop_on_error_sub_id' is set by '1'st execution.  Now
'handle_parallel_thread' code checks if the current group 'sub_id' is greater
than the 'sub_id' set within 'stop_on_error_sub_id'.

Since the above is true 'skip_event_group=true' is set.  Simply call
'wait_for_prior_commit' to wakeup all waiters.  Group '2' didn't had any
waitee and its execution is skipped.  Hence its wakeup_error=0.It sends a
positive wakeup signal to '3'. Which commits. This results in a missed
transaction. i.e 33 is missed and 34 is committed.

Fix:
===
When a worker learns that an earlier transaction execution has failed, and it
should not proceed for further execution, it should mark its own execution
status as failed so that it alerts its followers to abort as well.

A syntax error in the mysqld_multi.sh script has been fixed
here + a "--defaults-group-suffix" option has been moved to
the top of the mysqld options list.

The test encryption.innodb-redo-badkey was accidentally disabled
until commit 23657a21 enabled
it recently. Once it was enabled, it started failing randomly.

recv_recover_corrupt_page(): Do not assume that any redo log exists
for the page. A page may be unnecessarily read by read-ahead.
When noting the corruption, reset recv_addr->state to RECV_PROCESSED,
so that even if the same page is re-read again, we will only
decrement recv_sys->n_addrs once.

Spotted by Thirunarayanan Balathandayuthapani.

rw_lock_own(), rw_lock_own_flagged(): Traverse the rw_lock_t::debug_list
only after quickly checking if the thread is holding X-latch or SX-latch.

chkconfig --add and --del [might] invoke /sbin/insserv
and even if chkconfig exists, insserv might not (SLES15).

Ignore chkconfig --del errors - it's a "best effort" cleanup anyway

The test innodb_fts.fulltext_table_evict was only creating 1000 tables
with fulltext indexes, only to check that no tables with fulltext
indexes are being evicted.

The reason why tables containing fulltext indexes cannot be evicted is
that fts_optimize_init() invokes dict_table_prevent_eviction().

For CMAKE_BUILD_TYPE=Debug, the default MYSQL_MAINTAINER_MODE=AUTO
implies -Werror along with other flags in cmake/maintainer.cmake,
which would break the debug builds when CMAKE_CXX_FLAGS include -O2.

This fix includes a backport of 6dd3f240
from MariaDB 10.3.

Always initialize ScopedStatementReplication::saved_binlog_format,
so that GCC cannot emit a bogus warning about
ScopedStatementReplication::~ScopedStatementReplication() using the
variable.

The code was originally introduced in
commit d998da03.

lock_print_info::operator(): Do not dereference purge_sys.query in case
it is NULL. We would not initialize purge_sys if innodb_force_recovery
is set to 5 or 6.

The test case will be added by merge from 10.2.

Test innodb_read_only startup (which will be refused after a crash),
and test also innodb_force_recovery=5, and extract some change buffer
merge statistics. Omit any statistics about delete (purge) buffering,
because purge could happen at any time.

Use the sequence storage engine for populating the table.

Add a test case. MariaDB Server 10.2 is not affected.

A syntax error in the mysqld_multi.sh script has been fixed
here + a "--defaults-group-suffix" option has been moved to
the top of the mysqld options list.

Eliminate one InnoDB table with 128*16384 rows, and use
the sequence engine instead. Also, run everything in a single
transaction, to prevent purge from running concurrently
unnecessarily. (Starting with MariaDB Server 10.3, purge would
reset the DB_TRX_ID after INSERT.)

The arg was introduced as part of 75bcf1f9
to fix a SELinux problem caused by mysqld_safe accessing files it should
not be via the my_which function.

The root cause for this was fixed in 10.3, via
355ee687 which eliminated the my_which
function from mysqld_safe entirely. Thus, in 10.3, this --basedir flag
is not necessary.

btr_block_get(): Remove #ifdef around the definition