Lex_ident_sys had no new operator and was used incorrectly in
save_item_list_names(), so leaked memory.

MDEV-20523: rpl.create_or_replace_mix, rpl.create_or_replace_statement failed in buildbot with wrong result

Wait for the disconnect of the other connection to complete, before running
SHOW BINLOG EVENTS. Otherwise the DROP TEMPORARY TABLE that is binlogged
during disconnect may not have appeared yet depending on thread scheduling.
Signed-off-by: Kristian Nielsen <knielsen@knielsen-hq.org>

Fix wrong change to rpl.rpl_shutdown_wait_slaves. After shutting down the
master, slaves may or may not succeed in reconnecting depending on the timing
on their reconnect relative to master restart. So don't assume all IO threads
will be running, just restart any slave that needs it.
Signed-off-by: Kristian Nielsen <knielsen@knielsen-hq.org>

Fix sporadic test failure in rpl.rpl_ssl1. The test incorrectly did a STOP
SLAVE too early, which could race with the expected 'Access denied' error.
Signed-off-by: Kristian Nielsen <knielsen@knielsen-hq.org>

Fix sporadic test failures in rpl.rpl_set_statement_default_master and
rpl.rpl_slave_load_tmpdir_not_exist. A race between START and STOP
SLAVE could leave an error condition that causes test failure after
MDEV-32168.
Signed-off-by: Kristian Nielsen <knielsen@knielsen-hq.org>

Test rpl.show_status_stop_slave_race-7126 now fails sporadically
because it is expected to sometimes (but not always) leave an error
condition after slave stop. Fix by explicitly allowing the error
condition in this case.
Signed-off-by: Kristian Nielsen <knielsen@knielsen-hq.org>

Fix a start/stop race that causes occasional test failure after more the more
strict error check of MDEV-32168.
Signed-off-by: Kristian Nielsen <knielsen@knielsen-hq.org>

Calling SHOW BINLOG EVENTS FROM <offset> with an invalid offset
writes error messages into the server log about invalid reads. The
read errors that occur from this command should only be relayed back
to the user though, and not written into the server log. This is
because they are read-only and have no impact on server operation,
and the client only need be informed to correct the parameter.

This patch fixes this by omitting binary log read errors from the
server when the invocation happens from SHOW BINLOG EVENTS.
Additionally, redundant error messages are omitted when calling the
string based read_log_event from the IO_Cache based read_log_event,
as the later already will report the error of the former.

Reviewed By:
============
Kristian Nielsen <knielsen@knielsen-hq.org>
Andrei Elkin <andrei.elkin@mariadb.com>

To allow cmake -DWITH_ASAN=ON to work out of the box when using
newer compilers, we must increase the default thread stack size.

By design, AddressSanitizer will allocate some "sentinel" areas in
stack frames so that it can better catch buffer overflows, by trapping
access to memory addresses that reside between stack-allocated variables.

Apparently, some parameters related to this have been changed
recently, possibly to allow -fsanitize=address to catch more errors.

This fixes MDEV-30014, MDEV-29456, MDEV-29667, and MDEV-30049.

The server may ask storage engines to unlock when the original sql
command is not UNLOCK. This patch makes sure that spider honours these
requests, so that the server has the correct idea which tables are
locked and which are not.

MDEV-29456, MDEV-29667, MDEV-30049: a later LOCK statement would, as
the first step, unlock locked tables and clear the OPTION_TABLE_LOCK
bit in thd->variables.option_bits, as well as locked_tables_list,
indicating no tables are locked. If Spider does not unlock because the
sql command is not UNLOCK, and if after this the LOCK statement fails
to lock any tables, these indications that no tables are locked
remains, so a later UNLOCK TABLES; statement would not try to unlock
any table. Causing later statements requiring mdl locks to hang on
waiting until lock_wait_timeout (default 1h) has passed.

MDEV-30014: when a LOCK statement tries to lock more than one tables,
say t2 and t3 as in mdev_30014.test, and t2 succeeds but t3 fails, the
sql layer would try to undo by unlocking t2, and again, if Spider does
not honour this request, the sql layer would assume t2 has been
unlocked, but later actions on t2 or t2's remote table could hang on
waiting for the mdl.

Spider populates its lock lists (a hash) in store_lock(), and normally
clears them in the actual lock_tables(). However, if lock_tables()
fails, there's no reset_lock() method for storage engine handlers,
which can cause bad things to happen. For example, if one of the table
involved is dropped and recreated, or simply TRUNCATEd, when executing
LOCK TABLES again, the lock lists would be queried again in
store_lock(), which could cause access to freed space associated with
the dropped table.

Spider GBH's query rewrite of table joins is overly complex and
error-prone. We replace it with something closer to what
dbug_print() (more specifically, print_join()) does, but catered to
spider.

More specifically, we replace the body of
spider_db_mbase_util::append_from_and_tables() with a call to
spider_db_mbase_util::append_join(), and remove downstream append_X
functions.

We make it handle const tables by rewriting them as (select 1). This
fixes the main issue in MDEV-26247.

We also ban semijoin from spider gbh, which fixes MDEV-31645 and
MDEV-30392, as semi-join is an "internal" join, and "semi join" does
not parse, and it is different from "join" in that it deduplicates the
right hand side

Not all queries passed to a group by handler are valid (MDEV-32273),
for example, a join on expr may refer outer fields not in the current
context. We detect this during the handler creation when walking the
join. See also gbh_outer_fields_in_join.test.

It also skips eliminated tables, which fixes MDEV-26193.

Spider gbh query rewrite should get table for fields in a simple way.
Add a method spider_fields::find_table that searches its table holders
to find table for a given field. This way we will be able to get rid
of the first pass during the gbh creation where field_chains and
field_holders are created.

We also check that the field belongs to a spider table while walking
through the query, so we could remove
all_query_fields_are_query_table_members(). However, this requires an
earlier creation of the table_holder so that tables are added before
checking. We do that, and in doing so, also decouple table_holder and
spider_fields

Remove unused methods and fields. Add comments.

Two methods from spider_fields. There are probably more of these
conn_holder related methods that can be removed

reappend_tables_part()
reappend_tables()

- Reviewer: <knielsen@knielsen-hq.org>
            <brandon.nesterenko@mariadb.com>
            <andrei.elkin@mariadb.com>

Originally requested to be infinity, but rolled back to 99%
to allow for a remote ssh connection or the odd needed system
job. This is up from 15% which is the effective default of
DefaultTasksMax.

Thanks Rick Pizzi for the bug report.

MDEV-30064: binlog.binlog_mysqlbinlog_raw_flush sometimes fails with Errcode: 2 "No such file or directory"

Increase a 1-second timeout, which is a bit too small for slow buildbot
builders.
Signed-off-by: Kristian Nielsen <knielsen@knielsen-hq.org>

Reset the GTID sequence at the start of test so earlier run tests does not
influence the expected GTID sequence.
Signed-off-by: Kristian Nielsen <knielsen@knielsen-hq.org>

Wait for the binlog checkpoint event to fix non-determinism in the testcase.
Signed-off-by: Kristian Nielsen <knielsen@knielsen-hq.org>

The test was missing a wait_for_binlog_checkpoint.inc, making it non-deterministic
Signed-off-by: Kristian Nielsen <knielsen@knielsen-hq.org>

MDEV-32733: Two JSON related tests running in PS mode fail on server built with -DWITH_PROTECT_STATEMENT_MEMROOT=YES

The tests main.func_json and json.json_no_table fail on server built with
the option -DWITH_PROTECT_STATEMENT_MEMROOT=YES by the reason that a memory
is allocated on the statement's memory root on the second execution of
a query that uses the function json_contains_path().

The reason that a memory is allocated on second execution of a prepared
statement that ivokes the function json_contains_path() is that a memory
allocated on every call of the method Item_json_str_multipath::fix_fields

To fix the issue, memory allocation should be done only once on first
call of the method Item_json_str_multipath::fix_fields. Simmilar issue
take place inside the method Item_func_json_contains_path::fix_fields.
Both methods are modified to make memory allocation only once on its
first execution and later re-use the allocated memory.

Before this patch the memory referenced by the pointers stored in the array
tmp_paths were released by the method Item_func_json_contains_path::cleanup
that is called on finishing execution of a prepared statement. Now that
memory allocation performed inside the method Item_json_str_multipath::fix_fields
is done only once, the item clean up has degenerate form and can be
delegated to the cleanup() method of the base class and memory deallocation
can be performed in the destructor.

The getmntinfo64 interface is deprected in MacOSX12.1.sdk.

Using getmntinfo instead.

Thanks heyingquay for reporting the bug and testing the fix.

This fixes up commit 01031f43

When parsing statements like (SELECT .. FROM ..) ORDER BY <expr>,
there is a step LEX::add_tail_to_query_expression_body_ext_parens()
which calls LEX::wrap_unit_into_derived(). After that the statement
looks like SELECT * FROM (SELECT .. FROM ..), and parser's
Lex_order_limit_lock structure (ORDER BY <expr>) is assigned to
the new SELECT. But what is missing here is that Items in
Lex_order_limit_lock are left with their original name resolution
contexts, and fix_fields() later resolves the names incorrectly.

For example, when processing
  (SELECT * FROM t1 JOIN t2 ON a=b) ORDER BY a
Item_field 'a' in the ORDER BY clause is left with the name resolution
context of the derived table (first_name_resolution_table='t1'), so
it is resolved to 't1.a', which is incorrect.
After LEX::wrap_unit_into_derived() the statement looks like
  SELECT * FROM (SELECT * FROM t1 JOIN t2 ON a=b) AS '__2' ORDER BY a,
and the name resolution context for Item_field 'a' in the ORDER BY
must be set to the wrapping SELECT's one.

This commit fixes the issue by changing context for Items in
Lex_order_limit_lock after LEX::wrap_unit_into_derived().

There are two TABLE objects in each thread: first one is created in
delayed thread by Delayed_insert::open_and_lock_table(), second one is
created in connection thread by Delayed_insert::get_local_table(). It
is copied from the delayed thread table.

When the second table is copied copy-assignment operator copies
vcol_refix_list which is already filled with an item from delayed
thread. Then get_local_table() adds its own item. Thus both tables
contains the same list with two items which is wrong. Then connection
thread finishes and its item freed. Then delayed thread tries to
access it in vcol_cleanup_expr().

The fix just clears vcol_refix_list in the copied table.

Another problem is that copied table contains the same mem_root, any
allocations on it will be invalid if the original table is freed (and
that is indeterministic as it is done in another thread). Since copied
table is allocated in connection THD and lives not longer than
thd->mem_root we may assign its mem_root from thd->mem_root.

Third, it doesn't make sense to do open_and_lock_tables() on NULL
pointer.

mysql_compare_tables() treated all columns non-virtual. Now it
properly checks if the columns are virtual and matches expressions.

When computing vcol expression some items use current_thd and that was
not set in MyISAM repair thread. Since all the repair threads belong
to one connection and items should not write into THD we can utilize
table THD for that.

Attempt to resolve FOR SYSTEM_TIME expression as field for derived
table is done before derived table is fully prepared, so we fail on
assertion that table_list->table is missing.

Actually Vers_history_point::resolve_unit() is done under the call of
mysql_derived_prepare() itself (sql_derived.cc:824) and the table is
assigned later at 867.

The fix disables unit resolution for field type in FOR SYSTEM_TIME
expression as it does a little sense in any case: making historical
queries based on variable field values produces the result of multiple
time points.

fix_fields_if_needed() in resolve_units() was introduced by 46be3198

Index values for row_start/row_end was wrongly calculated for inplace
ALTER for some layout of virtual fields.

Possible impact

  1. history row is not detected upon build clustered index for
     inplace ALTER which may lead to duplicate key errors on
     auto-increment and FTS index add.
  2. foreign key constraint may falsely fail.
  3. after inplace ALTER before server restart trx-based system
     versioning can cause server crash or incorrect data written upon
     UPDATE.

The patch for "MDEV-25440: Indexed CHAR ... broken with NO_PAD collations"
fixed these scenarios from MDEV-26743:
- Basic latin letter vs equal accented letter
- Two letters vs equal (but space padded) expansion

However, this scenario was still broken:
- Basic latin letter (but followed by an ignorable character)
  vs equal accented letter

Fix:
When processing for a NOPAD collation a string with trailing ignorable
characters, like:
  '<non-ignorable><ignorable><ignorable>'

the string gets virtually converted to:
  '<non-ignorable><ignorable><ignorable><space><space><space>...'

After the fix the code works differently in these two cases:
1. <space> fits into the "nchars" limit
2. <space> does not fit into the "nchars" limit

Details:

1. If "nchars" is large enough (4+ in this example),
   return weights as follows:

  '[weight-for-non-ignorable, 1 char] [weight-for-space-character, 3 chars]'

  i.e. the weight for the virtual trailing space character now indicates
  that it corresponds to total 3 characters:
  - two ignorable characters
  - one virtual trailing space character

2. If "nchars" is small (3), then the virtual trailing space character
   does not fit into the "nchar" limit, so return 0x00 as weight, e.g.:

  '[weight-for-non-ignorable, 1 char] [0x00, 2 chars]'

Adding corresponding MTR tests and unit tests.

Problem:

The file backup-my.cnf from the backup directory was loaded by
"mariabackup --prepare" only in case of the explicit --target-dir given.
It was not loaded from the default directory ./xtrabackup_backupfiles/
in case if the explicit --target-dir was missing.

In other words, it worked as follows:

1. When started as "mariabackup --prepare --target-dir=DIR", mariabackup:
  a. loads defaults from "DIR/backup-my.cnf"
  b. processes data files in the specified directory DIR

2. When started as "mariabackup --prepare", mariabackup:
  a. does not load defaults from "./xtrabackup_backupfiles/backup-my.cnf"
  b. processes data files in the default directory "./xtrabackup_backupfiles/"

This patch fixes the second scenario, so it works as follows:

2. When started as "mariabackup --prepare", mariabackup:
  a. loads defaults from "./xtrabackup_backupfiles/backup-my.cnf"
  b. processes data files in the default directory "./xtrabackup_backupfiles/"

This change fixes (among others) the problem with the
"Can't open shared library '/file_key_management.so'" error
reported when "mariabackup --prepare" is used without --target-dir
in combinaton with the encryption plugin.

The crash happened with an indexed virtual column whose
value is evaluated using a function that has a different meaning
in sql_mode='' vs sql_mode=ORACLE:

- DECODE()
- LTRIM()
- RTRIM()
- LPAD()
- RPAD()
- REPLACE()
- SUBSTR()

For example:

CREATE TABLE t1 (
  b VARCHAR(1),
  g CHAR(1) GENERATED ALWAYS AS (SUBSTR(b,0,0)) VIRTUAL,
  KEY g(g)
);

So far we had replacement XXX_ORACLE() functions for all mentioned function,
e.g. SUBSTR_ORACLE() for SUBSTR(). So it was possible to correctly re-parse
SUBSTR_ORACLE() even in sql_mode=''.

But it was not possible to re-parse the MariaDB version of SUBSTR()
after switching to sql_mode=ORACLE. It was erroneously mis-interpreted
as SUBSTR_ORACLE().

As a result, this combination worked fine:

SET sql_mode=ORACLE;
CREATE TABLE t1 ... g CHAR(1) GENERATED ALWAYS AS (SUBSTR(b,0,0)) VIRTUAL, ...;
INSERT ...
FLUSH TABLES;
SET sql_mode='';
INSERT ...

But the other way around it crashed:

SET sql_mode='';
CREATE TABLE t1 ... g CHAR(1) GENERATED ALWAYS AS (SUBSTR(b,0,0)) VIRTUAL, ...;
INSERT ...
FLUSH TABLES;
SET sql_mode=ORACLE;
INSERT ...

At CREATE time, SUBSTR was instantiated as Item_func_substr and printed
in the FRM file as substr(). At re-open time with sql_mode=ORACLE, "substr()"
was erroneously instantiated as Item_func_substr_oracle.

Fix:

The fix proposes a symmetric solution. It provides a way to re-parse reliably
all sql_mode dependent functions to their original CREATE TABLE time meaning,
no matter what the open-time sql_mode is.

We take advantage of the same idea we previously used to resolve sql_mode
dependent data types.

Now all sql_mode dependent functions are printed by SHOW using a schema
qualifier when the current sql_mode differs from the function sql_mode:

SET sql_mode='';
CREATE TABLE t1 ... SUBSTR(a,b,c) ..;
SET sql_mode=ORACLE;
SHOW CREATE TABLE t1;   ->   mariadb_schema.substr(a,b,c)

SET sql_mode=ORACLE;
CREATE TABLE t2 ... SUBSTR(a,b,c) ..;
SET sql_mode='';
SHOW CREATE TABLE t1;   ->   oracle_schema.substr(a,b,c)

Old replacement names like substr_oracle() are still understood for
backward compatibility and used in FRM files (for downgrade compatibility),
but they are not printed by SHOW any more.

This imports and adapts a number of MySQL 5.7 test cases that are
applicable to MariaDB.

Some tests for old bug fixes are not that relevant because the code
has been refactored since then (especially starting with
MariaDB Server 10.6), and the tests would not reproduce the
original bug if the fix was reverted.

In the test innodb_fts.opt, there are many duplicate MATCH ranks, which
would make the results nondeterministic. The test was stabilized by
changing some LIMIT clauses or by adding sorted_result in those cases
where the purpose of a test was to show that no sorting took place
in the server.

In the test innodb_fts.phrase, MySQL 5.7 would generate FTS_DOC_ID that
are 1 larger than in MariaDB. In innodb_fts.index_table the difference is 2.
This is because in MariaDB, fts_get_next_doc_id() post-increments
cache->next_doc_id, while MySQL 5.7 pre-increments it.

Reviewed by: Thirunarayanan Balathandayuthapani

In some cases "SHOW PROCESSLIST" could show "Reset for next command"
as State, even if the previous query had finished properly.

Fixed by clearing State after end of command and also setting the State
for the "Connect" command.

Other things:
- Changed usage of 'thd->set_command(COM_SLEEP)' to
  'thd->mark_connection_idle()'.
- Changed thread_state_info() to return "" instead of NULL. This is
  just a safety measurement and in line with the logic of the
  rest of the function.