- Moving select_options_and_item_list from select_init2
  to select_init and view_select_aux
- Renaming select_init2 to select_init3
This will simplify upcoming sql_yacc.yy fixes (e.g. MDEV-10035, MDEV-8909).

An addition to original patch:
- use FN_REFLEN instead of HOST_NAME_MAX (the latter can be undefined)
- avoid calling gethostname() on every prompt construction by caching it

Introduce `\H` option which behaves mostly like `\h`. The only exception is
when the client connects to the server hosted on localhost. In this case, the
hostname will be used instead.

closer the grammar in the SQL Standard:
- <query specification> is only a SELECT followed by
  <set quantifier>, <select list> and <table expression>.
- While <query term> includes SELECT queries and derived tables.

MDEV-10036 sql_yacc.yy: Split select_part2 to disallow syntactically bad constructs with INTO, PROCEDURE, UNION
MDEV-10037 UNION with LIMIT ROWS EXAMINED does not require parentheses

MDEV-10030 sql_yacc.yy: Split table_expression and remove PROCEDURE from create_select, select_paren_derived, select_derived2, query_specification

This change refactors the "table_expression" rule in sql_yacc.yy.

Queries with subselects and derived tables, as well as "CREATE TABLE ... SELECT"
now return syntax error instead of "Incorrect usage of PROCEDURE and ...".

This is an addition to original patch. Removed meaningless
"echo SET SESSION AUTOCOMMIT=0" (transaction is started explicitely on
master anyway).

- Don't log connection creation in galera_connect.inc

* simplify the code at default: label
* bugfix: flush the checksum for NULL fields
  (perfschema.checksum was failing)
* cleanup: put repeated code into a function

Error noted by Sergey Vojtovich.

Checksum implementations contain optimizations for calculating
checksums of larger blocks of memory.

This optimization calls my_checksum on a larger block of memory
rather than calling on multiple adjacent memory as its going though
the table columns for each table row.

- Change some static variables to dynamic to ensure that we don't do any memory
  allocations before server starts or stops
- Print more memory information on SIGHUP. Fixed output.
- Write out if memory was lost if run with --debug-at-exit
- Fixed wrong #ifdef in sql_cache.cc

- Avoid some realloc() during startup
- Ensure that file_key_management_plugin frees it's memory early, even if
  it's linked statically.
- Fixed compiler warnings from unused variables and missing destructors
- Fixed wrong indentation

MariaDB 10.1.x 32-bit binaries.

Problem was the fact that tablespace size was incorrectly
rounded to next extent size (1M).

wrong mutex usage from safe_mutex.
Ensure that LOCK_status is always taken before LOCK_thread_count

Problem was that cost_group_min_max() could not handle if group by was optimized away.

This appears to break some installation, and it did not do anything
useful anyway.

change buffer not empty

Fix: Allow not empty change buffer when innodb_force_recovery >= 5
and output only a warning to error log.

Note: Before using force recovery you should always take backup
of your database.

When the specification of a WITH table referred to a view
that used a based table with the same name as the WITH table
the server went into an infinite loop because it erroneously
resolved the reference to the base table as the reference to
the WITH table.

With tables used in a view cannot be searched for beyond the
scope the view.

When the specification of a WITH table referred to a view
that used a based table with the same name as the WITH table
the server went into an infinite loop because it erroneously
resolved the reference to the base table as the reference to
the WITH table.

With tables used in a view cannot be searched for beyond the
scope the view.

The issues themselves were fixed as part of MDEV-8646

When join output is just one row, we still need to compute window
function values for it. We could skip invoking filesort for it,
but it doesn't seem to be worth it to do such optimization.

Make Frame_range_current_row_bottom to take into account partition bounds.

Other partition bounds that could potentially hit the end of partition are
Frame_range_n_bottom, Frame_n_rows_following, Frame_unbounded_following,
and they all had end-of-partition protection.

To simplify the code, factored out end-of-partition checks into
class Partition_read_cursor.