Something was wrong with the removal of pointer indirection,
because on 32-bit Windows we got crash recovery failures.
Curiously, WITH_ASAN of a 32-bit debug build did not notice anything.

This reverts a part of commit b7fc2c89.

We have a 2MiB recv_sys.buf for the initial buffering. The minimum size
of log_sys.buf would be 16MiB, and that buffer should be practically
unused during recovery. If the buffer pool size is measured in gigabytes,
it would indeed make sense to use the buffer pool for the recovered log
records, perhaps after we have run out of log_sys.buf.

FIXME: allow the entire buf_block_t::frame to be used for buffered
log records, and remove MEM_HEAP_FOR_RECV_SYS. For example, use
buf_page_t::list or buf_page_t::LRU for keeping track of memory that
was allocated for recovery? Most members of buf_block_t
(except buf_block_t::frame) are unused when
block->page.state == BUF_BLOCK_MEMORY.

Follow-up to commit 8965ae27:
always initialize found_group.

recv_t, recv_t::data_t: Define constructors that copy the log records

Ideally, we should remove recv_sys.buf, RECV_DATA_BLOCK_SIZE,
and recv_sys_justify_left_parsing_buf(), and let the
recv_sys.pages point directly to a buffer of parsed redo log
records.

The RECV_PARSING_BUF_SIZE (size of recv_sys.buf) is only 2MiB,
while the minimum innodb_log_buffer_size (size of log_sys.buf) is 16MiB,
and log_sys.buf is unused during redo log apply!

Except for fil_name_process(), which invokes os_normalize_path(),
the redo log record parser will not modify the redo log records.
Add const qualifiers accordingly.

followup to 00c3a288

storage/innobase/log/log0recv.cc|1760 col 35 error| 'void* memcpy(void*, const void*, size_t)' writing to an object of type 'struct recv_t' with no trivial copy-assignment [-Werror=class-memaccess]

GCC 4.7 only knows about std::map::insert(), not emplace().

Also, reformat the function in the common style.

page_recv_t: Replaces recv_sys_t::recs_t.
page_recv_t::state is not private, even though some accessors exist.

page_recv_t::log: A singly-linked list of log_rec_t* with STL decoration
and the custom operations trim() and append(). The list members are private.

recv_t::data_t: Replaces recv_data_t.

recv_t::data: Remove the pointer indirection for the first log chunk,
and copy the first chunk directly after the record. Adjust the
definition of RECV_DATA_BLOCK_SIZE accordingly.

In the collections of Standard Template Library,
empty() is a predicate and clear() empties a collection.
Let us rename recv_sys.empty() to recv_sys.clear() to avoid confusion.

simplify type naming (less boilerplate code).
don't force a plugin to specify the name twice.

typos, comments

In order to:
- unify sql_yacc.yy and sql_yacc_ora.yy easier
- move more functionality from the parser to Type_handler
  (so plugins can override the behavior)

this patch:
- removes rules sp_param_field_type_string and sp_param_field_type
  from sql_yacc_ora.yy
- adds a new virtial method Type_handler::Column_definition_set_attributes()

ut_strcmp(), ut_strcpy(), ut_strlen(), ut_memcpy(), ut_memcmp(),
ut_memmove(): Remove. Invoke the standard library functions directly.

TODO: do not use fil_* functions for redo log files.

log_t::checkpoint_lock: remove this lock which was used to wait for
async I/O completion.

checkpoint_lock_key
checkpoint_lock: remove now unneeded globals

log_write_checkpoint_info(): remove sync argument because all checkpoint
writes are synchronous now

log_write_checkpoint_info(): remove sync argument

log_group_checkpoint(): merge with the only caller

log_complete_checkpoint(): merge with the only caller

log_t::complete_checkpoint(): remove by merging with the only caller.

Adding the missing grammar.

Fixing unintentionally diverged parts:
- syncing indentation
- syncing "unlikely"
- syncyning missing new lines
- fixing typos

The test rpl.rpl_failed_drop_tbl_binlog exercises a scenario where
the adaptive hash index is enabled. Try to explicitly enable the
adaptive hash index for this test, and skip the test if it does not
succeed (that is, if the server was not built WITH_INNODB_AHI=ON).

Don't assume that passwords (and other conv replies) are zero-terminated.
If they are, though, strndup() down below will take care of that.

Historically, InnoDB split the redo log into at least 2 files.
MDEV-12061 allowed the minimum to be innodb_log_files_in_group=1,
but it kept the default at innodb_log_files_in_group=2.

Because performance seems to be slightly better with only one log file,
and because implementing an append-only variant of the log would require
a single file, let us define the default to be 1, and have
innodb_log_file_size=96M, to retain the same default total size.

clang warns if only some overridden member functions in a class
are tagged with the C++11 override keyword. Add the missing keywords.

Remove redundant NULL checks for __attribute__((nonnull)) parameters,
because clang warns about them.

This reverts commit 2b5f4b3e
due to build failures.

Update wsrep-lib, and adapt to wsrep-lib interface changes.

Based on the performance testing that was conducted in MDEV-17492,
the InnoDB adaptive hash index could only help performance in specific,
almost-read-only workloads. It could slow down all kinds of workloads
(especially DROP TABLE, TRUNCATE TABLE, ALTER TABLE, or DROP INDEX
operations), and it can become corrupted, causing crashes (such as
MDEV-18815, MDEV-20203) and possibly data corruption. Furthermore,
the adaptive hash index consumes space from the InnoDB buffer pool,
which could hurt performance when the working set would almost fit
in the buffer pool.

Given all this, it is best to disable the adaptive hash index by default.

Ignore warning.

Changes to be committed:
	modified:   mysql-test/suite/galera_sr/disabled.def
	modified:   mysql-test/suite/galera_sr/r/GCF-561.result
	modified:   mysql-test/suite/galera_sr/r/galera_sr_ddl_master.result
	modified:   mysql-test/suite/galera_sr/r/galera_sr_kill_query.result
	modified:   mysql-test/suite/galera_sr/r/galera_sr_shutdown_slave.result
	new file:   mysql-test/suite/galera_sr/suite.pm
	modified:   mysql-test/suite/galera_sr/t/GCF-561.test
	modified:   mysql-test/suite/galera_sr/t/galera_sr_ddl_master.test
	modified:   mysql-test/suite/galera_sr/t/galera_sr_kill_query.test
	modified:   mysql-test/suite/galera_sr/t/galera_sr_shutdown_slave.test

Test should die if innodb_compression_algorithm=3 doesn't exists

Fixes MDEV-18067, MDEV-18068 and MDEV-18069

The problem was that FLUSH TABLES table_name combined with UNLOCK TABLES
calls MDL_context::set_transaction_duration_for_all_locks(), which
changed backup_locks from MDL_EXPLICT to MDL_TRANSACTION.

Fixed by ensuring that set_transaction_duration_for_all_locks() doesn't
touch BACKUP locks.