convert_error_code_to_mysql(): Use the correct limit FK_MAX_CASCADE_DEL
in the error message. The DICT_FK_MAX_RECURSIVE_LOAD applies to
the number of foreign key constraints in table definitions,
not to the number of rows that are visited while processing
a foreign key constraint.

On FreeBSD, the error message would say "Resource deadlock avoided".
Let us simply replace the error message string in the test.

MDEV-22500 Assertion `thd->killed != 0' failed in ha_maria::enable_indexes

For MDEV-17223 the issue was an assert that didn't take into account that
we could get duplicate key errors when enablling unique indexes.
Fixed by not retrying repair in case of duplicate key error for this
case, which avoids the assert.

For MDEV-22500 I removed the assert, as it's not critical (just a way to
find potential wrong code) and we will anyway get things logged in the
error log if this happens. This case cannot triggered an assert in 10.3
but I verified that it would trigger in 10.5 and that this patch fixes
it.

Some GNU/Linux distributions ship a zlib that is modified to use
the s390x DFLTCC instruction. That modification would essentially
redefine compressBound(sourceLen) as (sourceLen * 16 + 2308) / 8 + 6.

Let us relax the tests for InnoDB ROW_FORMAT=COMPRESSED to cope with
such a weaker compression guarantee.

create_table_info_t::row_size_is_acceptable(): Remove a bogus debug-only
assertion that would fail to hold for the test innodb_zip.bug36169.
The function page_zip_empty_size() may indeed return 0.

Added ability to disable/enable (--disable_view_protocol/--enable_view_protocol) view-protocol in tests.
When the  option "--disable_view_protocol" is used  util connections are closed.
Added new test for checking view-protocol

The rpl.rpl_seconds_behind_master_spike test would sometimes
timeout or take a very long time to complete. This happened
because an MTR DEBUG_SYNC signal would be lost due to a
subsequent call to RESET. I.e., the slave SQL thread would
be paused due to the WAIT_FOR signal being lost, resulting in
either a failed test if the `select master_pos_wait` timeout
occurs first, or a very long run-time if the DBUG_SYNC timeout
occurs first.

The fix ensures that the MTR signal is processed by the slave
SQL thread before issuing the call to RESET

Reviewed By:
============
Andrei Elkin <andrei.elkin@mariadb.com>

MDEV-27746 Wrong comparision of BLOB's empty preffix with non-preffixed BLOB causes rows count mismatch for clustered and secondary indexes during non-locking read

row_sel_sec_rec_is_for_clust_rec() treats empty BLOB prefix field in
secondary index as a field equal to any external BLOB field in clustered
index. Row_sel_get_clust_rec_for_mysql::operator() doesn't zerro out
clustered record pointer in row_search_mvcc(), and row_search_mvcc()
thinks that delete-marked secondary index record has visible for
"CHECK TABLE"'s read view old-versioned clustered index record, and
row_scan_index_for_mysql() counts it as a row.

The fix is to execute row_sel_sec_rec_is_for_blob() in
row_sel_sec_rec_is_for_clust_rec() if clustered field contains BLOB's
reference.

The asserion failure was caused by this query

  select /*id=1*/ from t1
  where
   col= ( select /*id=2*/ from ... where corr_cond1
          union
          select /*id=4*/ from ... where corr_cond2)

Here,
- select with id=2 was correlated due to corr_cond1.
- select with id=4 was initially correlated due to corr_cond2, but then
  the optimizer optimized away the correlation, making the select with id=4
  uncorrelated.

However, since select with id=2 remained correlated, the execution had to
re-compute the whole UNION. When it tried to execute select with id=4, it
hit an assertion  (join buffer already free'd).

This is because select with id=4 has freed its execution structures after
it has been executed once. The select is uncorrelated, so it did not expect
it would need to be executed for the second time.

Fixed this by adding this logic in
st_select_lex::optimize_unflattened_subqueries():

  If a member of a UNION is correlated, mark all its members as
  correlated, so that they are prepared to be executed multiple times.

don't let Aria create a table that it cannot open

use the correct check. before invoking handler methods we
need to know that the table was opened, not only created.

Do not assume that subquery Item always present.

Removed all dependencies of command line arguments based on positions in
an array (this kind of code should never have been written).
Instead use option names, which are stable.

Reviewer: Sergei Golubchik

Use portable quoting in mtr_add_arg.

- Changed SST scripts to use /usr/bin/env bash instead of
  /bin/bash for better portability.
- Fixed use of mktemp on non-Linux platforms to produce
  temporary file instead of directory.
Reviewed-by: Jan Lindström <jan.lindstrom@mariadb.com>

(Backport Varun Gupta's patch + edit the commit comment)

Name resolution code produced errors for valid queries with window
functions (but not for queries which used aggregate functions as
window functions).

Name resolution code worked incorrectly, because window function
objects had is_window_func_sum_expr()=false. This was so, because
mark_as_window_func_sum_expr() was only called for aggregate functions
used as window functions.

The fix is to call it for any window function.

Fixed the test to execute only on linux as it depends on unportable sed.

revert 68b3fa88

accessing freed memory.
Before XMLCOL::WriteColumn() Tdbp->Clist gets assigned
a nodelist in

      Clist = RowNode->SelectNodes(g, Colname, Clist);

which is RowNode->Doc->Xop->nodesetval.

In XMLCOL::WriteColumn()

        ValNode = ColNode->SelectSingleNode(g, Xname, Vxnp);

calls LIBXMLDOC::GetNodeList() again, which frees the previous
XPath object Xop and replaces it with a new one.

In this case RowNode->Doc == ColNode->Doc, so Clist->Listp
points to a freed memory now.

fix it for Aria too

- Revert wrongly record embedded result files. These were either
  recorded with normal server (not embedded) or an embedded server
  with not default compile option. This can be seen that the committed
  result file had replication variables which should never happen.

- Reverted back change of include/is_embedded.inc. One cannot check for
  $MYSQL_EMBEDDED as this only tells if there exists an embedded
  server, not if the current server we are testing is the embedded
  server. This could easily be verified by doing
  'mtr sys_vars.sysvars_server_embedded'. This would fail with a wrong
  result instead of being marked as skipped as --embedded was not
  used.

This happens when compiled with HAVE_EMBEDDED_PRIVILEGE_CONTROL.
There is a lot of other problems with the above option that should
be fixed at some point

This failed because of MDEV-18918 which removed DEFAULT's

Backport from 10.6

Adds reload and --datadir functionality to mysqld_multi
Increased version to 3.0

Source:
https://github.com/openSUSE/mysql-packaging/blob/master/patches/mysql-patches/mariadb-10.0.15-mysqld_multi-features.patch

Author: Michal Hrusecky <Michal.Hrusecky@opensuse.org>
Reviewer: monty@mariadb.org