Parser: uninitialized Lex->create_last_non_select_table under
mysql_unpack_partition() fix.

Tested with main, parts suites.

Re-enable main.mysql_client_test on all builders, because
at the moment we do not run any --big-test on buildbot
due to resource constraints.

A number of tests were declared big in
commit eeee1832
in an attempt to save resources on buildbot.

The default keyread_time() was optimized for blocks and not suitable for
HEAP. The effect was the HEAP prefered table scans over ranges for btree
indexes.
Fixed also get_sweep_read_cost() for HEAP tables.

- Move testing of my_writer to inline functions to avoid calls
- Made more functions inline. Especially thd->thread_started()
  is now very optimized!
- Moved Opt_trace_stmt classe to opt_trace_context.h to get critical
  functions inline

- Added unlikely() to optimize for not having optimizer trace enabled
- Made THD::trace_started() inline
- Added 'if (trace_enabled())' around some potentially expensive code
  (not many found)
- Added ASSERT's to ensure we don't call expensive optimizer trace calls
  if optimizer trace is not enabled
- Added length to Json_writer functions to speed up buffer writes
  when optimizer trace is enabled.
- Changed LEX_CSTRING argument handling to not send full struct to writer
  function on_add_str() functions now trusts length arguments

Stop masking the Data_free values, because innodb_file_per_table=1
is the default.

Also, do mask Update_time after updating tables, even though for
some reason it does appear to matter.

Change events only on Galera environment where idea is that
event is enabled only on one node of the cluster and nodes
are identified by server_id.

* Small refactor of my_getncpus function to compile for very old glibc < 2.6.
* Cleanup code to eliminate duplication.

Cleanup install_layout to account for multi-arch setup and remove
redundant defines in debian rules.
Signed-off-by: Vicențiu Ciorbaru <vicentiu@mariadb.org>

The .pc file installed by mariadb mentions archful directories and
therefore must be archful itself.

This fixes MDEV-14340.

status threads_connected can temporarily be bigger than max_connections+1

If SHOW STATUS LIKE "Threads_connected" comes after
ER_CON_COUNT_ERROR is sent to the client, but before the counter is
decremented, Threads_connected can differ from the expected value.

ha_partition: Remove redundant 'virtual' keywords and add
missing 'override'.

FIXME: handler::table_type() is not declared virtual, yet ha_partition
and ha_sequence are seemingly trying to override it.

- Flag ALTER_STORED_COLUMN_TYPE set while doing varchar extension
for partition table. Basically all partition supports
can_be_converted_by_engine() then it should be set to
ALTER_COLUMN_TYPE_CHANGE_BY_ENGINE.

Main select should be pushed first in case of SET STATEMENT.

When installing, no headers are installed into the parent directory of
`${includedir}`.

cmake cannot detect openssl headers on Mac during checks.
the solution is to add path to openssl includes to
CMAKE_REQUIRED_INCLUDES before checks.

added cmake checks for pam_ext.h and pam_appl.h headers
added check for pam_syslog()
added pam_syslog() if doesn't exist
all cmake checks performed from inside the plugin

           join_cache_level=6+

The patch fixes two similar bugs in the commit 8eeb689e
that added multi_range_read support to partitions. The commit opened
a possibility to join a partition table using BKA+MRR. However in some
cases it could lead to wrong results or even crashes.

This could happened when
- index condition pushdown was used to join the table or
- the joined table was an inner table of an outer join and 'not exist'
  optimization was applied or
- the join table was the inner table of a semi-join and the first match
  optimization was applied

The bugs were in the code of the call-back functions
- partition_multi_range_key_skip_record() and
- partition_multi_range_key_skip_index_tuple().
Each of this function consist only of an invocation of another function.
Yet a wrong parameter was passed at this invocation.

The fix was suggested by Sergey Petrunia and it is apparently in line
with original design.
The corresponding comprehensive test cases demonstrating the problems
caused by the bugs were constructed by me.

No adverse effects since this was made a null function in
6b53f9d7.

This function had the last remaining cmake CMP0026 violation.

cmake enabling -DENABLE_DTRACE=ON is particularlly noisy with CMP0026
errors.

Fixed in the same way as 6b53f9d7