Ensure that pointer to a buffer which is used for both reads and writes
is properly aligned.

I've intentially put permanent check right before io_submit() call instead
of the time of setting iocb date. I think that'll make check better.

LinuxAIOHandler::resever_slot(): check arguments alignment in debug builds

Add proper wsrep sync wait.

The function get_wkb_of_default_point() should never have been
added, and the cleanup in commit 56ff6f1b
should have removed it.

The unnecessary code was added in
mysql/mysql-server@0a27b72171c4449f506ad4e93df8c29fead1ed72
and mostly disabled in
mysql/mysql-server@8f11af7734509821b654f2c330dff5374c89073c.

In MariaDB, the types DATA_POINT and DATA_VAR_POINT are never used.
Instead, DATA_GEOMETRY continues to be used since 10.2.2, introduced by
mysql/mysql-server@673bad7c7e17701b69e29d0fbc4e2d68c1a7b613
in MySQL 5.7.1.

galera_2nodes.cnf did not contain wsrep_on=1 on correct places. Fixed
restart options to use correct configuration.

orig_test_id should be set properly.
Also fixed sporadic test failure.

executing undo undo_key_delete" upon startup on datadir restored from
incremental backup

aria_log* files were not copied on --prepare --incremental-dir step from
incremental to destination backup directory.

The thread_id of the INSERT DELAYED thread should not be set to 0.

Add notifications about the user and connection that actually
did the DELAYED insert.

As noted in commit abd45cdc
a search with PAGE_CUR_GE may land on the supremum record on
a leaf page that is not the rightmost leaf page. This could occur
when all keys on the current page are smaller than the search key,
and the smallest key on the successor page is larger than the search key.

Hence, after a failed PAGE_CUR_GE search, assertions
btr_pcur_is_after_last_in_tree() are bogus
and should be replaced with btr_pcur_is_after_last_on_page().

fix bug for spider where using "not like" (#890)

test case:
t1 is a spider engine table;
  CREATE TABLE `t1` (
  `id` int(11) NOT NULL DEFAULT '0',
  `name` char(64) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=SPIDER

query: "select * from t1 where name  not like 'x%' " would dispatch "select xxx name name like 'x%' " to remote mysqld, is wrong

Replace all io_context* occurrences with io_context_t

Even in release mode die immediately when some io_* functions return
EINVAL. This always means some programming bug and it's better to fail fast.

LinuxAIOHandler::resubmit(): fix condition. Stop ignoring -1 return code which
corresponds to EPERM and io_submit() really can return this one.

Use io_destroy() to stop leaking io_context_t.

Make m_aio_ctx std::vector instead of C array. I think that internal check
for index overflow might be useful.

Add debug assertions for EFAULT because for me receiving it
looks like a programming bug.

MDEV-20832 Don't print "row size too large" warnings in error log if innodb_strict_mode=OFF and log_warnings<=2

create_table_info_t::row_size_is_acceptable(): add condition for log writing

The fix consists of three commits backported from 10.3:

1) Cleanup isnan() portability checks

(cherry picked from commit 7ffd7fe9)

2) Cleanup isinf() portability checks

Original problem reported by Wlad: re-compilation of 10.3 on top of 10.2
build would cache undefined HAVE_ISINF from 10.2, whereas it is expected
to be 1 in 10.3.

std::isinf() seem to be available on all supported platforms.
(cherry picked from commit bc469a0b)

3) Use std::isfinite in C++ code

This is addition to parent revision fixing build failures.

(cherry picked from commit 54999f4e)

buf_read_ibuf_merge_pages(): Discard any page numbers that are
outside the current bounds of the tablespace, by invoking the
function ibuf_delete_recs() that was introduced in MDEV-20934.
This could avoid an infinite change buffer merge loop on
innodb_fast_shutdown=0, because normally the change buffer merge
would only be attempted if a page was successfully loaded into
the buffer pool.

dict_drop_index_tree(): Add the parameter trx_t*.
To prevent the DROP TABLE crash, do not invoke btr_free_if_exists()
if the entire .ibd file will be dropped. Thus, we will avoid a crash
if the BTR_SEG_LEAF or BTR_SEG_TOP of the index is corrupted,
and we will also avoid unnecessarily accessing the to-be-dropped
tablespace via the buffer pool.

In MariaDB 10.2, we disable the DROP TABLE fix if innodb_safe_truncate=0,
because the backup-unsafe MySQL 5.7 WL#6501 form of TRUNCATE TABLE
requires that the individual pages be freed inside the tablespace.

using create_w_max_indexes_64.result as a template

Move row size check to early CREATE/ALTER TABLE phase. Stop checking
on table open.

dict_index_add_to_cache(): remove parameter 'strict', stop checking row size

dict_index_t::record_size_info_t: this is a result of row size check operation

create_table_info_t::row_size_is_acceptable(): performs row size check.
Issues error or warning. Writes first overflow field to InnoDB log.

create_table_info_t::create_table(): add row size check

dict_index_t::record_size_info(): this is a refactored version
of dict_index_t::rec_potentially_too_big(). New version doesn't change global
state of a program but return all interesting info. And it's callers who
decide how to handle row size overflow.

dict_index_t::rec_potentially_too_big(): removed

memo_block_unfix(), memo_latch_release(): Merge to ReleaseLatches.

memo_slot_release(), ReleaseAll: Clean up the formatting.

A search with PAGE_CUR_GE may land on the supremum record on
a leaf page that is not the rightmost leaf page.
This could occur when all keys on the current page are
smaller than the search key, and the smallest key on the
successor page is larger than the search key.

ibuf_delete_recs(): Correct the debug assertion accordingly.

Closes #1407

mtr_t::Impl, mtr_t::Command: Merge to mtr_t.

MTR_MAGIC_N: Remove.

MTR_STATE_COMMITTING: Remove. This state was only being set
internally during mtr_t::commit().

mtr_t::Command::m_locks_released: Remove (set-and-never-read member).

mtr_t::Command::m_start_lsn: Replaced with the return value of
finish_write() and a parameter to release_blocks().

mtr_t::Command::m_end_lsn: Removed as a duplicate of mtr_t::m_commit_lsn.

mtr_t::Command::prepare_write(): Replace a switch () with a
comparison against 0. Only 2 m_log_mode are allowed.

Avoid creating std::vector, and use single instead of double traversal.

Problem:
========
CURRENT_TEST: binlog_encryption.rpl_corruption

mysqltest: In included file "./include/wait_for_slave_io_error.inc":
...
At line 72: Slave stopped with wrong error code
**** Slave stopped with wrong error code: 1743 (expected 1595,1913) ****

Analysis:
========
The test emulates the corruption at the various stages of replication for
example in binlog file, in network and in relay log etc. It verifies that all
corruption cases are handled through appropriate error messages.

The test cases which emulate network failure expect following errors.
--ER_SLAVE_RELAY_LOG_WRITE_FAILURE (1595)
--ER_NETWORK_READ_EVENT_CHECKSUM_FAILURE (1743)

Ideally test should expect error codes as 1595 and 1743.
But the test actually waits on incorrect error code 1595,1913

Fix:
===
Added appropriate error code for 'ER_NETWORK_READ_EVENT_CHECKSUM_FAILURE'.
Replaced 1913 with 1743.

The XDES_CLEAN_BIT is always set for every element of
the page allocation bitmap in the extent descriptor pages.
Do not bother touching it, to avoid redundant writes.

The DICT_HDR_MAX_SPACE_ID was already zero-initialized at page allocation.

page_rec_write_field(): Remove.

dict_create_index_tree_step(): If the SYS_INDEXES.PAGE does not change,
do not update it in the data dictionary. Typically, all index page numbers
would be unchanged before and after IMPORT TABLESPACE, except if some
secondary indexes were created after loading some data.

btr_root_fseg_adjust_on_import(): Remove the redundant mtr_t* parameter.
Redo logging is disabled during the page adjustments that IMPORT TABLESPACE
is performing.

The root page must never have any siblings, so it is unnecessary
to clear those fields.

fsp_alloc_seg_inode_page(): Ever since
commit 3926673c
all newly allocated pages are zero-initialized.
Assert that this is the case for the FSEG_ID fields.

btr_store_big_rec_extern_fields(): Remove the redundant initialization
of the most significant 32 bits of BTR_EXTERN_LEN. InnoDB never supported
BLOBs that are longer than 4GiB. In fact, dtuple_convert_big_rec()
would write emit an error message if a clustered index record tuple would
exceed 1,000,000,000 bytes in length.

The BTR_EXTERN_LEN in the BLOB pointers in clustered index leaf page
records is zero-initialized at least since
commit 41bb3537

Remove the unnecessary retrieval and null-modifications of
the preceding page.

Remove the redundant parameter mtr_t*.

Make use of page_has_prev(), page_has_next() whenever possible.

Remove the unnecessary retrieval and null-modifications of
the preceding page.

MDEV-19376 Repl_semi_sync_master::commit_trx assertion failure: ... || !m_active_tranxs->is_tranx_end_pos(trx_wait_binlog_name, trx_wait_binlog_pos)

The assert indicates that the current transaction got caught uncleaned from
the semisync master's cache when it is signaled to proceed upon its
ack receive.

The reason of missed cleanup turns out to be a flaw in the gtid
connect mode.
A submitted by connecting slave value of its last received event's
binlog file *name* was adopted into
{{Repl_semi_sync_master::m_reply_file_name}} as a part of semisync
initialization.

Notice that the initialization still refines the position part of the
submitted last received event's binlog coordinates.
The master side binlog filename:pos refinement is
specific to the gtid connect mode for purpose of computing the latest
binlog file to resume slave feeding from.
Effectively in the gtid connect mode the computed resumption filename:pos
may appear smaller in which case a new post-connect time committing
transaction may be logged with its filename:pos also less than the
submitted coordinates and that triggers the assert.

Fixed with making the semisync initialization to use the refined filename:pos.
It is guaranteed to be less than any new generated transaction's binlog:pos.

Make sure failure to find mariabackup binary does not terminate
the script silently, terminate with a clear error message instead