Remove test galera.MDEV-27713. This test relies on GET_LOCK() and has
stopped working since commit 844ddb1 (see MDEV-30473). This commit
disabled GET_LOCK() in combination with Galera.
Signed-off-by: Julius Goryavsky <julius.goryavsky@mariadb.com>
Problem for Galera is the fact that sequences are not really
transactional. Sequence operation is committed immediately
in sql_sequence.cd and later Galera could find out that
we have changes but actual statement is not there anymore.
Therefore, we must make some restrictions what kind
of sequences Galera can support.
(1) Galera cluster supports only sequences implemented
by InnoDB storage engine. This is because Galera replication
supports currently only InnoDB.
(2) We do not allow LOCK TABLE on sequence object and
we do not allow sequence creation under LOCK TABLE, instead
lock is released and we issue warning.
(3) We allow sequences with NOCACHE definition or with
INCREMEMENT BY 0 CACHE=n definition. This makes sure that
sequence values are unique accross Galera cluster.
Signed-off-by: Julius Goryavsky <julius.goryavsky@mariadb.com>
lower_case_table_names=2 means "table names and database names are
stored as declared, but they are compared in lowercase".
But names of objects in grants are stored in lowercase for any value
of lower_case_table_names. This caused an error when checking grants
for objects containing uppercase letters since table_hash_search()
didn't take into account lower_case_table_names value
EXPLAIN EXTENDED should always print the field item used in the left part
of an equality expression from the SET clause of an update statement as a
reference to table column.
Approved by Oleksandr Byelkin <sanja@mariadb.com>
This bug affected EXPLAIN EXTENDED command for single-table DELETE that
used an IN subquery in its WHERE clause. A crash happened if the optimizer
chose to employ index_subquery or unique_subquery access when processing
such command.
The crash happened when the command tried to print the transformed query.
In the current code of 10.4 for single-table DELETE statements the output
of any explain command is produced after the join structures of all used
subqueries have been destroyed. JOIN::destroy() sets the field tab of the
JOIN_TAB structures created for subquery tables to NULL. As a result
subselect_indexsubquery_engine::print(), subselect_indexsubquery_engine()
cannot use this field to get the alias name of the joined table.
This patch suggests to use the field TABLE_LIST::TAB that can be accessed
from JOIN_TAB::tab_list to get the alias name of the joined table.
Approved by Oleksandr Byelkin <sanja@mariadb.com>
- main.selectivity failed because one test produced different result with
embedded (missing feature). Fixed by moving the failing part to
selectivity_notembedded.
- Disabled maria.encrypt-no-key for embedded as embedded does not support
encryption
- Moved test from join_cache to join_cache_notasan that tried to alloc()
a buffer bigger than available memory.
- Remove virtual from get_min_join_buffer_size() and
get_max_join_buffer_size().
- Avoid some calls to get_min_buffer_size()
- Simply cache usage in get_..._join_buffer_size()
- Simplify get_max_join_buffer_size() when using optimize_buff_size
- Reindented some long comments
Reviewer: Sergei Petrunia <sergey@mariadb.com>
The old code did set max_records to either number_of_rows
(partial_join_cardinality) or memory size (join_buffer_space_limit)
which did not make sense.
Fixed by setting max_records to number of rows that fits into
join_buffer_size.
Other things:
- Initialize buffer cache values in JOIN_CACHE constructors (safety)
Reviewer: Sergei Petrunia <sergey@mariadb.com>
The problem, introduced in patch for MDEV-26301:
When check_join_cache_usage() decides not to use join buffer, it must
adjust the access method accordingly. For BNL-H joins this means switching
from pseudo-"ref access"(with index=MAX_KEY) to some other access method.
Failing to do this will cause assertions down the line when code that is
not aware of BNL-H will try to initialize index use for ref access with
index=MAX_KEY.
The fix is to follow the regular code path to disable the join buffer for
the join_tab ("goto no_join_cache") instead of just returning from
check_join_cache_usage().
The problem was that join_buffer_size conflicted with
join_buffer_space_limit, which caused the query to be run without join
buffer. However this caused wrong results as the optimizer assumed
that hash+join buffer would ensure that the equi-join condition
would be satisfied, and didn't check it itself.
Fixed by not using join_buffer_space_limit when
optimize_join_buffer_size=off. This matches the documentation at
https://mariadb.com/kb/en/block-based-join-algorithms
Other things:
- Removed not used variable JOIN_TAB::join_buffer_size_limit
- Give an error if we cannot allocate a join buffer. This can
only happen if the join_buffer variables are wrongly configured or
we are running out of memory.
In the future, instead of returning an error, we could properly
convert the query plan that uses BNL-H join into one that doesn't
use join buffering:
make sure the equi-join condition is checked where appropriate.
Reviewer: Sergei Petrunia <sergey@mariadb.com>
RocksDB (in a submodule) has to include <cstdint> to use uint64_t
but it doesn't. Until the submodule is upgraded, let's replace
problematic types with something that's available
select_insert::store_values() must reset
has_value_set bitmap before every row, just like mysql_insert() does.
because ON DUPLICATE KEY UPDATE and triggers modify it
This patch optimizes the number of refills for the lateral derived table
to which a materialized derived table subject to split optimization is
is converted. This optimized number of refills is now considered as the
expected number of refills of the materialized derived table when searching
for the best possible splitting of the table.
galera.galera_log_bin test created the test tables and executed initial DML into node 2
Then connection is switched to node 1, where ALTER TABLE was attempted. But there is no guarantee that the table to alter was yet replicated to node 1.
The fix in this commit, creates the test tables in node 1 instead, so it is guaranteed that they are available for the later ALTER
Signed-off-by: Julius Goryavsky <julius.goryavsky@mariadb.com>
When a query does implicit grouping and join operation produces an empty
result set, a NULL-complemented row combination is generated.
However, constant table fields still show non-NULL values.
What happens in the is that end_send_group() is called with a
const row but without any rows matching the WHERE clause.
This last part is shown by 'join->first_record' not being set.
This causes item->no_rows_in_result() to be called for all items to reset
all sum functions to their initial state. However fields are not set
to NULL.
The used fix is to produce NULL-complemented records for constant tables
as well. Also, reset the constant table's records back in case we're
in a subquery which may get re-executed.
An alternative fix would have item->no_rows_in_result() also work
with Item_field objects.
There is some other issues with the code:
- join->no_rows_in_result_called is used but never set.
- Tables that are used with group functions are not properly marked as
maybe_null, which is required if the table rows should be regarded as
null-complemented (not existing).
- The code that tries to detect if mixed_implicit_grouping should be set
didn't take into account all usage of fields and sum functions.
- Item_func::restore_to_before_no_rows_in_result() called the wrong
function.
- join->clear() does not use a table_map argument to clear_tables(),
which caused it to ignore constant tables.
- unclear_tables() does not correctly restore status to what is
was before clear_tables().
Main bug fix was to always use a table_map argument to clear_tables() and
always use join->clear() and clear_tables() together with unclear_tables().
Other fixes:
- Fixed Item_func::restore_to_before_no_rows_in_result()
- Set 'join->no_rows_in_result_called' when no_rows_in_result_set()
is called.
- Removed not used argument from setup_end_select_func().
- More code comments
- Ensure that end_send_group() modifies the same fields as are in the
result set.
- Changed return_zero_rows() to use pointers instead of references,
similar to the rest of the code.
The problem was that mutex_init() was called after the worker was
put into the domain_hash, which allowed other threads to access it
before mutex was initialized.
The cause of the crash was that test was setting
aria_sort_buffer_size to MAX_LONG_LONG, which caused an overflow in
my_malloc() when trying to allocate the buffer + 8 bytes.
Fixed by reducing max size of sort_buffer for Aria and MyISAM
Other things:
- Added code in maria_repair_parallell() to not allocate a big sort buffer
for small files.
- Updated size of minumim sort buffer in Aria
The reason for the MDEV reported failures is that the tests are enabling
encryption for Aria but not providing any encryption keys.
Fixed by checking if encryption keys exists before creating the table.
Other things:
- maria.encrypt_wrong-key changed as we now get the error on CREATE
instead during insert.
- Update wsrep-lib which contains fix for the assertion
- Fix error handling for appending fragment to streaming log,
make sure tables are closed after rollback.
Signed-off-by: Julius Goryavsky <julius.goryavsky@mariadb.com>
Adding virtual methods to class Schema:
make_item_func_replace()
make_item_func_substr()
make_item_func_trim()
This is a non-functional preparatory change for MDEV-27744.
Variant #2.
When Histogram::point_selectivity() sees that the point value of interest
falls into one bucket, it tries to guess whether the bucket has many
different (unpopular) values or a few popular values. (The number of
rows is fixed, as it's a Height-balanced histogram).
The basis for this guess is the "width" of the value range the bucket
covers. Buckets covering wider value ranges are assumed to contain
values with proportionally lower frequencies.
This is just a [brave] guesswork. For a very narrow bucket, it may
produce an estimate that's larger than total #rows in the bucket
or even in the whole table.
Remove the guesswork and replace it with basic logic: return
either the per-table average selectivity of col=const, or selectivity
of one bucket, whichever is lower.
Fix-up for commit 476b24d084
Author: Monty
Date: Thu Feb 16 14:19:33 2023 +0200
MDEV-20057 Distinct SUM on CROSS JOIN and grouped returns wrong result
which misses initializing of sorder->suffix_length.
In this commit the initialization is implemented by passing
MY_ZEROFILL flag to the allocation of SORT_FIELD elements
When using binlog_row_image=FULL with sequence table inserts, a
replica can deadlock because it treats full inserts in a sequence as DDL
statements by getting an exclusive lock on the sequence table. It
has been observed that with parallel replication, this exclusive
lock on the sequence table can lead to a deadlock where one
transaction has the exclusive lock and is waiting on a prior
transaction to commit, whereas this prior transaction is waiting on
the MDL lock.
This fix for this is on the master side, to raise FL_DDL
flag on the GTID of a full binlog_row_image write of a sequence table.
This forces the slave to execute the statement serially so a deadlock
cannot happen.
A test verifies the deadlock also to prove it happen on the OLD (pre-fixes)
slave.
OLD (buggy master) -replication-> NEW (fixed slave) is provided.
As the pre-fixes master's full row-image may represent both
SELECT NEXT VALUE and INSERT, the parallel slave pessimistically
waits for the prior transaction to have committed before to take on the
critical part of the second (like INSERT in the test) event execution.
The waiting exploits a parallel slave's retry mechanism which is
controlled by `@@global.slave_transaction_retries`.
Note that in order to avoid any persistent 'Deadlock found' 2013 error
in OLD -> NEW, `slave_transaction_retries` may need to be set to a
higher than the default value.
START-SLAVE is an effective work-around if this still happens.
