In commit fa8a46eb (MDEV-33613)
the parameter innodb_lru_flush_size ceased to have any effect.

Let us declare the parameter as deprecated and additionally as
MARIADB_REMOVED_OPTION, so that there will be a warning written
to the error log in case the option is specified in the command line.

Let us also do the same for the parameter
innodb_purge_rseg_truncate_frequency
that was deprecated&ignored earlier in MDEV-32050.

Reviewed by: Debarun Banerjee

Let us avoid EXTENDED in the CHECK TABLE after a defragmentation,
because it would occasionally report an orphan delete-marked record
in the index "third". That error does not seem to be reproducible
when using the regular OPTIMIZE TABLE.

Also, let us make the test --repeat safe by removing the defragmentation
related statistics after DROP TABLE.

The defragmentation feature was removed in later releases in
commit 7ca89af6 (MDEV-30545)
along with this test case.

purge_sys_t::stop_FTS(): Fix an incorrect debug assertion that
commit d58734d7 added.
The assertion would fail if there had been prior invocations of
purge_sys.stop_SYS() without purge_sys.resume_SYS().
The intention of the assertion is to check that number of pending
stop_FTS() stays below 65536.

The test was expecting the I/O thread to be in a specific state, but thread
scheduling may cause it to not yet have reached that state. So just have a
loop that waits for the expected state to occur.
Signed-off-by: Kristian Nielsen <knielsen@knielsen-hq.org>

Signed-off-by: Kristian Nielsen <knielsen@knielsen-hq.org>

Remove the test for MDEV-14528. This is supposed to test that parallel
replication from pre-10.0 master will update Seconds_Behind_Master. But
after MDEV-12179 the SQL thread is blocked from even beginning to fetch
events from the relay log due to FLUSH TABLES WITH READ LOCK, so the test
case is no longer testing what is was intended to. And pre-10.0 versions are
long since out of support, so does not seem worthwhile to try to rewrite the
test to work another way.

The root cause of the test failure is MDEV-34778. Briefly, depending on
exact timing during slave stop, the rli->sql_thread_caught_up flag may end
up with different value. If it ends up as "true", this causes
Seconds_Behind_Master to be 0 during next slave start; and this caused test
case timeout as the test was waiting for Seconds_Behind_Master to become
non-zero.
Signed-off-by: Kristian Nielsen <knielsen@knielsen-hq.org>

Depending on timing, an extra event run could start just when the event
scheduler is shut down and delay running until after the table has been
dropped; this would cause the test to fail with a "table does not exist"
error in the log.
Signed-off-by: Kristian Nielsen <knielsen@knielsen-hq.org>

(Revert a change done by mistake when XtraDB was removed.)
Signed-off-by: Kristian Nielsen <knielsen@knielsen-hq.org>

Before doing mark_start_commit(), check that there is no pending deadlock
kill. If there is a pending kill, we won't commit (we will abort, roll back,
and retry). Then we should not mark the commit as started, since that could
potentially make the following GCO start too early, before we completed the
commit after the retry.

This condition could trigger in some corner cases, where InnoDB would take
temporarily table/row locks that are released again immediately, not held
until the transaction commits. This happens with dict_stats updates and
possibly auto-increment locks.

Such locks can be passed to thd_rpl_deadlock_check() and cause a deadlock
kill to be scheduled in the background. But since the blocking locks are
held only temporarily, they can be released before the background kill
happens. This way, the kill can be delayed until after mark_start_commit()
has been called. Thus we need to check the synchronous indication
rgi->killed_for_retry, not just the asynchroneous thd->killed.
Signed-off-by: Kristian Nielsen <knielsen@knielsen-hq.org>

Before this patch, the InnoDB purge coordinator task submitted
innodb_purge_threads-1 tasks even if there was not sufficient amount
of work for all of them. For example, if there are undo log records
only for 1 table, only 1 task can be employed, and that task had better
be the purge coordinator.

srv_purge_worker_task_low(): Split from purge_worker_callback().

trx_purge_attach_undo_recs(): Remove the parameter n_purge_threads,
and add the parameter n_work_items, to keep track of the amount of
work.

trx_purge(): Launch purge worker tasks only if necessary. The work of
one thread will be executed by this purge coordinator thread.

que_fork_scheduler_round_robin(): Merged to trx_purge().

Thanks to Vladislav Vaintroub for supplying a prototype of this.

Reviewed by: Debarun Banerjee

In a Sysbench oltp_update_index workload that involves 1 table,
a serious contention between the workload and the purge of history
was observed. This was the worst when the table contained only 1 record.

This turned out to be fixed by setting innodb_purge_batch_size=128,
which corresponds to the number of usable persistent rollback segments.
When we go above that, there would be contention between row_purge_poss_sec()
and the workload, typically on the clustered index page latch, sometimes
also on a secondary index page latch. It might be that with smaller
batches, trx_sys.history_size() will end up pausing all concurrent
transaction start/commit frequently enough so that purge will be able
to make some progress, so that there would be less contention on the
index page latches between purge and SQL execution.

In commit aa719b50 (part of MDEV-32050)
the interpretation of the parameter innodb_purge_batch_size was slightly
changed. It would correspond to the maximum desired size of the
purge_sys.pages cache. Before that change, the parameter was referring to
a number of undo log pages, but the accounting might have been inaccurate.

To avoid a regression, we will reduce the default value to
innodb_purge_batch_size=127, which will also be compatible with
innodb_undo_tablespaces>1 (which will disable rollback segment 0).

Additionally, some logic in the purge and MVCC checks is simplified.
The purge tasks will make use of purge_sys.pages when accessing undo
log pages to find out if a secondary index record can be removed.
If an undo page needs to be looked up in buf_pool.page_hash, we will
merely buffer-fix it. This is correct, because the undo pages are
append-only in nature. Holding purge_sys.latch or purge_sys.end_latch
or the fact that the current thread is executing as a part of an
in-progress purge batch will prevent the contents of the undo page from
being freed and subsequently reused. The buffer-fix will prevent the
page from being evicted form the buffer pool. Thanks to this logic,
we can refer to the undo log record directly in the buffer pool page
and avoid copying the record.

buf_pool_t::page_fix(): Look up and buffer-fix a page. This is useful
for accessing undo log pages, which are append-only by nature.
There will be no need to deal with change buffer or ROW_FORMAT=COMPRESSED
in that case.

purge_sys_t::view_guard::view_guard(): Allow the type of guard to be
acquired: end_latch, latch, or no latch (in case we are a purge thread).

purge_sys_t::view_guard::get(): Read-only accessor to purge_sys.pages.

purge_sys_t::get_page(): Invoke buf_pool_t::page_fix().

row_vers_old_has_index_entry(): Replaced with row_purge_is_unsafe()
and row_undo_mod_sec_unsafe().

trx_undo_get_undo_rec(): Merged to trx_undo_prev_version_build().

row_purge_poss_sec(): Add the parameter mtr and remove redundant
or unused parameters sec_pcur, sec_mtr, is_tree. We will use the
caller's mtr object but release any acquired page latches before
returning.

btr_cur_get_page(), page_cur_get_page(): Do not invoke page_align().

row_purge_remove_sec_if_poss_leaf(): Return the value of PAGE_MAX_TRX_ID
to be checked against the page in row_purge_remove_sec_if_poss_tree().
If the secondary index page was not changed meanwhile, it will be
unnecessary to invoke row_purge_poss_sec() again.

trx_undo_prev_version_build(): Access any undo log pages using
the caller's mini-transaction object.

row_purge_vc_matches_cluster(): Moved to the only compilation unit that
needs it.

Reviewed by: Debarun Banerjee

There were two separate Atomic_counter<uint32_t>, purge_sys.m_SYS_paused
and purge_sys.m_FTS_paused. In purge_sys.wait_FTS() we have to read both
atomically. We used to use an overkill solution for this, acquiring
purge_sys.latch and waiting 10 milliseconds between samples. To make
matters worse, the 10-millisecond wait was unconditional, which would
unnecessarily suspend the purge_coordinator_task every now and then.

It turns out that we can fold both "reference counts" into a single
Atomic_relaxed<uint32_t> and avoid the purge_sys.latch.
To assess whether std::memory_order_relaxed is acceptable, we should
consider the operations that read these "reference counts", that is,
purge_sys_t::wait_FTS(bool) and purge_sys_t::must_wait_FTS().

Outside debug assertions, purge_sys.must_wait_FTS() is only invoked in
trx_purge_table_acquire(), which is covered by a shared dict_sys.latch.
We would increment the counter as part of a DDL operation, but before
acquiring an exclusive dict_sys.latch. So, a
purge_sys_t::close_and_reopen() loop could be triggered slightly
prematurely, before a problematic DDL operation is actually executed.
Decrementing the counter is less of an issue; purge_sys.resume_FTS()
or purge_sys.resume_SYS() would mostly be invoked while holding an
exclusive dict_sys.latch; ha_innobase::delete_table() does it outside
that critical section. Still, this would only cause some extra wait in
the purge_coordinator_task, just like at the start of a DDL operation.

There are two calls to purge_sys_t::wait_FTS(bool): in the above mentioned
purge_sys_t::close_and_reopen() and in purge_sys_t::clone_oldest_view(),
both invoked by the purge_coordinator_task. There is also a
purge_sys.clone_oldest_view<true>() call at startup when no DDL operation
can be in progress.

purge_sys_t::m_SYS_paused: Merged into m_FTS_paused, using a new
multiplier PAUSED_SYS = 65536.

purge_sys_t::wait_FTS(): Remove an unnecessary sleep as well as the
access to purge_sys.latch. It suffices to poll purge_sys.m_FTS_paused.

purge_sys_t::stop_FTS(): Do not acquire purge_sys.latch.

Reviewed by: Debarun Banerjee

Discovered this while working on MDEV-34720: test_if_cheaper_ordering()
uses rec_per_key, while the original estimate for the access method
is produced in best_access_path() by using actual_rec_per_key().

Make test_if_cheaper_ordering() also use actual_rec_per_key().
Also make several getter function "const" to make this compile.
Also adjusted the testcase to handle this (the change backported from
11.0)

buf_page_ibuf_merge_try(): A new, separate function for invoking
ibuf_merge_or_delete_for_page() when needed. Use the already requested
page latch for determining if the call is necessary. If it is and
if we are currently holding rw_latch==RW_S_LATCH, upgrading to an exclusive
latch may involve waiting that another thread acquires and releases
a U or X latch on the page. If we have to wait, we must recheck if the
call to ibuf_merge_or_delete_for_page() is still needed. If the page
turns out to be corrupted, we will release and fail the operation.
Finally, the exclusive page latch will be downgraded to the originally
requested latch.

ssux_lock_impl::rd_u_upgrade_try(): Attempt to upgrade a shared lock to
an update lock.

sux_lock::s_x_upgrade_try(): Attempt to upgrade a shared lock to
exclusive.

sux_lock::s_x_upgrade(): Upgrade a shared lock to exclusive.
Return whether a wait was elided.

ssux_lock_impl::u_rd_downgrade(), sux_lock::u_s_downgrade():
Downgrade an update lock to shared.

MDEV-33582 (3541bd63) changed the "Could not write packet"
error message in net_serv.cc to use the function
sql_print_warning(), instead of my_printf_error(). The flags
argument was not removed in this change though, so the old
flags were printed in place of the file descriptor, and all
other args are presenting for the wrong field (and length is
never showed).

This patch removes flags as a parameter to sql_print_warning().

One cause of the slowdown is because the ftruncate call can be much
slower on some systems.  ftruncate() is called by Aria for internal
temporary tables, tables created by the optimizer, when the upper level
asks Aria to delete the previous result set. This is needed when some
content from previous tables changes.

I have now changed Aria so that for internal temporary tables we don't
call ftruncate() anymore for maria_delete_all_rows().

I also had to update the Aria repair code to use the logical datafile
size and not the on-disk datafile size, which may contain data from a
previous result set.  The repair code is called to create indexes for
the internal temporary table after it is filled.
I also replaced a call to mysql_file_size() with a pwrite() in
_ma_bitmap_create_first().

Reviewer: Sergei Petrunia <sergey@mariadb.com>
Tester: Dave Gosselin <dave.gosselin@mariadb.com>

removed duplicated methods

Missed method added.

In commit 232d7a5e we almost got
the detection logic right. However, the XGETBV instruction would
crash if Linux was started up with the option noxsave.

have_vpclmulqdq(): Check for the XSAVE flag at the correct position
and also for the AVX flag.

This was tested on Ubuntu 22.04 by starting up its Linux 5.15 kernel
with and without the noxsave option.

Added missed methods to Item_string child.

Missing methods added to Item_bin_string

This is needed as the order of rows are not deterministic,
especially in future versions of table statistics.

The original code is correct.

valgrind and asan binaries should be built with a specialiced version of
mem_root that makes it easier to find memory overwrites.
This is what the BUILD scripts is doing.

The specialiced mem_root code allocates a new block for every allocation
which is visiable for any test that depenmds on the default original malloc
size and usage.

Running an UPDATE statement in PS mode and having positional
parameter(s) bound with an array of actual values (that is
prepared to be run in bulk mode) results in incorrect behaviour
in presence of on update trigger that also executes an UPDATE
statement. The same is true for handling a DELETE statement in
presence of on delete trigger. Typically, the visible effect of
such incorrect behaviour is expressed in a wrong number of
updated/deleted rows of a target table. Additionally, in case UPDATE
statement, a number of modified rows and a state message returned
by a statement contains wrong information about a number of modified rows.

The reason for incorrect number of updated/deleted rows is that
a data structure used for binding positional argument with its
actual values is stored in THD (this is thd->bulk_param) and reused
on processing every INSERT/UPDATE/DELETE statement. It leads to
consuming actual values bound with top-level UPDATE/DELETE statement
by other DML statements used by triggers' body.

To fix the issue, reset the thd->bulk_param temporary to the value
nullptr before invoking triggers and restore its value on finishing
its execution.

The second part of the problem relating with wrong value of affected
rows reported by Connector/C API is caused by the fact that diagnostics
area is reused by an original DML statement and a statement invoked
by a trigger. This fact should be take into account on finalizing a
state of diagnostics area on completion running of a statement.

Important remark: in case the macros DBUG_OFF is on, call of the method
  Diagnostics_area::reset_diagnostics_area()
results in reset of the data members
  m_affected_rows, m_statement_warn_count.
Values of these data members of the class Diagnostics_area are used on
sending OK and EOF messages. In case DML statement is executed in PS bulk
mode such resetting results in sending wrong result values to a client
for affected rows in case the DML statement fires a triggers. So, reset
these data members only in case the current statement being processed
is not run in bulk mode.

The #pragma that was removed in
commit e255837e (MDEV-34266)
turns out to be necessary for silencing all cases of
-Wstringop-truncation.

When SUX_LOCK_GENERIC is defined, the srw_mutex, srw_lock, sux_lock are
implemented based on pthread_mutex_t and pthread_cond_t.  This is the
only option for systems that lack a futex-like system call.

In the SUX_LOCK_GENERIC mode, if pthread_mutex_init() is allocating
some resources that need to be freed by pthread_mutex_destroy(),
a memory leak could occur when we are repeatedly invoking
pthread_mutex_init() without a pthread_mutex_destroy() in between.

pthread_mutex_wrapper::initialized: A debug field to track whether
pthread_mutex_init() has been invoked.  This also helps find bugs
like the one that was fixed by
commit 1c8af2ae (MDEV-34422);
one simply needs to add -DSUX_LOCK_GENERIC to the CMAKE_CXX_FLAGS
to catch that particular bug on the initial server bootstrap.

buf_block_init(), buf_page_init_for_read(): Invoke block_lock::init()
because buf_page_t::init() will no longer do that.

buf_page_t::init(): Instead of invoking lock.init(), assert that it
has already been invoked (the lock is vacant).

add_fts_index(), build_fts_hidden_table(): Explicitly invoke
index_lock::init() in order to avoid a pthread_mutex_destroy()
invocation on an uninitialized object.

srw_lock_debug::destroy(): Invoke readers_lock.destroy().

trx_sys_t::create(): Invoke trx_rseg_t::init() on all rollback segments
in order to guarantee a deterministic state for shutdown, even if
InnoDB fails to start up.

trx_rseg_array_init(), trx_temp_rseg_create(), trx_rseg_create():
Invoke trx_rseg_t::destroy() before trx_rseg_t::init() in order to
balance pthread_mutex_init() and pthread_mutex_destroy() calls.

- Added plugin_debug.test, multiple_index.test to innodb_fts suite
from mysql-5.7.

- commit c5b28e55 removes the warning
for InnoDB rebuilding table to add FTS_DOC_ID

- multiple_index test case  has MATCH(a) values are smaller
than in MySQL because ROLLBACK updates the stat_n_rows.

- st_mysql_ftparser_boolean_info structure conveys boolean
metadata to mysql search engine for every word in the query.
This structure misses the position value to store the correct
offset of every word. So phrase search queries in plugin_debug
test case with boolean mode for simple parser throws
wrong result.

With wsrep_sst_rsync, node goes into endless loop when trying
to establish connection to donor for IST/SST if the database
is bind on specific IP address, not the "*".

This commit fixes this problem. Separate tests are not
required - the problem can occur in normal configurations
on a number of systems when selecting a bing address other
than "*", especially on FreeBSD and with the IPv6 addresses.

int wsrep_thd_append_key(THD*, const wsrep_key*, int, Wsrep_service_key_type)

CREATE TABLE [SELECT|REPLACE SELECT] is CTAS and idea was that
we force ROW format. However, it was not correctly enforced
and keys were appended before wsrep transaction was started.

At THD::decide_logging_format we should force used stmt binlog
format to ROW in CTAS case and produce a warning if used
binlog format was not ROW.

At ha_innodb::update_row we should not append keys similarly
as in ha_innodb::write_row if sql_command is SQLCOM_CREATE_TABLE.
Improved error logging on ::write_row, ::update_row and ::delete_row
if wsrep key append fails.
Signed-off-by: Julius Goryavsky <julius.goryavsky@mariadb.com>

A mixture of a multi-byte *TEXT column and a short binary column
produced a too large column.
For example, COALESCE(tinytext_utf8mb4, short_varbinary)
produced a BLOB column instead of an expected TINYBLOB.

- Adding a virtual method Type_all_attributes::character_octet_length(),
  returning max_length by default.
- Overriding Item_field::character_octet_length() to extract
  the octet length from the underlying Field.
- Overriding Item_ref::character_octet_length() to extract
  the octet length from the references Item (e.g. as VIEW fields).
- Fixing Type_numeric_attributes::find_max_octet_length() to
  take the octet length using the new method character_octet_length()
  instead of accessing max_length directly.

Let perror produce OS error messages in English