This is part 2 of the MySQL 5.7.1 announcement
* Replication: In certain cases, the dump thread could send a
heartbeat out of synchronisation with format description
events. One of the effects of this issue what that, after
provisioning a new server from a backup data directory and
setting --gtid-mode=ON and enabling autopositioning (see
CHANGE MASTER TO Syntax
(http://dev.mysql.com/doc/refman/5.7/en/change-master-to.html)
), replication failed to start, with the error Read invalid
event from master.... The same problem could also cause
GTID-based replication to fail due to skipped events following
a unplanned shutdown of the master. (Bug #16051857)
* Replication: In some cases, when the slave could not recognize
the server version of the master, this could cause the slave
to fail. (Bug #16056365)
* Replication: Dropping a table that includes non-regular ASCII
characters in the table name caused a replication failure. The
parser converted the table name into standard charset
characters and stored the table name in the table_name
variable. When the drop table query was regenerated using the
table_name variable, the table name was not converted back to
the original charset.
Additionally, table and database names with 64 characters
caused an assert failure. The assert required the table or
database name to be less than 128 characters. Latin characters
require two-bytes each, which requires an assert condition of
less than or equal to 128 bits.
The fix includes a new function to convert tables names back
to the original charset, and a correction to the assert
condition allowing table and database names be less than or
equal to 128 bits. (Bug #16066637)
* Replication: When using GTID-based replication, and whenever a
transaction was executed on the master but was not sent to the
slave because the slave already had a transaction with that
ID, semisynchrononous replication timed out. One case in which
this could happen was during a failover operation where the
new master started behind the new slave. (Bug #15985893)
* Replication: An unnecessary flush to disk performed after
every transaction when using FILE as the replication info
repository type could degrade performance. Now this is done
only when both data and relay log info is stored in
(transactional) tables. (Bug #15980626)
* Replication: When reading row log events from the binary log,
the slave assumed that these events were always valid; because
of this, an event having an invalid binary log offset could
cause the slave to crash. Now in such cases, the slave fails
gracefully, and an error is reported, if any of the fields in
a given row event are invalid. (Bug #15829568)
* Replication: Table IDs used in replication were defined as
type ulong on the master and uint on the slave. In addition,
the maximum value for table IDs in binary log events is 6
bytes (281474976710655). This combination of factors led to
the following issues:
+ Data could be lost on the slave when a table was assigned
an ID greater than uint.
+ Table IDs greater than 281474976710655 were written to
the binary log as 281474976710655.
+ This led to a stopped slave when the slave encountered
two tables having the same table ID.
To fix these problems, IDs are now defined by both master and
slave as type ulonglong but constrained to a range of 0 to
281474976710655, restarting from 0 when it exceeds this value.
(Bug #14801955, Bug #67352)
* Replication: MASTER_POS_WAIT() could hang or return -1 due to
invalid updates by the slave SQL thread when transactions were
skipped by the GTID protocol. (Bug #14737388)
References: See also Bug #15927032.
* Replication: Trying to execute a Stop event on a multithreaded
slave could cause unwanted updates to the relay log, leading
the slave to lose synchronization with the master. (Bug
#14737388)
* Replication: Internal objects used for relay log information
were only partially deleted before freeing their memory. (Bug
#14677824)
* Replication: When the server starts, it checks whether
semisynchronous replication has been enabled without a lock,
and, if so, it takes the lock, then tests again. Disabling
semisynchronous replication following the first of the these
tests, but prior to the second one, could lead to a crash of
the server. (Bug #14511533, Bug #66411)
* Replication: It was possible in certain cases---immediately
after detecting an EOF in the dump thread read event loop, and
before deciding whether to change to a new binary log
file---for new events to be written to the binary log before
this decision was made. If log rotation occurred at this time,
any events that occurred following EOF detection were dropped,
resulting in loss of data. Now in such cases, steps are taken
to make sure that all events are processed before allowing the
log rotation to take place. (Bug #13545447, Bug #67929)
References: See also Bug #16016886.
* Replication: It was possible for the MASTER_POS_WAIT()
function to return prematurely following a CHANGE MASTER TO
statement that updated the RELAY_LOG_POS or RELAY_LOG_NAME.
This could happen because CHANGE MASTER TO did not update the
master log position in such cases, causing MASTER_POS_WAIT()
to read an invalid log position and to return immediately.
To fix this problem, the master log position is flagged as
invalid until the position is set to a valid value when the
SQL thread reads the first event, after which it is flagged as
valid. Functions such as MASTER_POS_WAIT() now defer any
comparison with the master log position until a valid value
can be obtained (that is, after the first event following the
CHANGE MASTER TO statement has been applied). (Bug #11766010,
Bug #59037)
* Replication: If the disk becomes full while writing to the
binary log, the server hangs until space is freed up manually.
It was possible after this was done for the MySQL server to
fail, due to an internal status value being set when not
needed. Now in such cases, rather than trying to set this
status, a warning is written in the error log instead. (Bug
#11753923, Bug #45449)
* Replication: The binary log and relay log files used the name
of the PID file instead of the host name as the basename. (Bug
#11753843, Bug #45359)
* Microsoft Windows: In Shared Memory mode
(http://dev.mysql.com/doc/refman/5.7/en/server-options.html#op
tion_mysqld_shared-memory), the MySQL Server could crash when
receiving requests from multiple threads. (Bug #13934876)
* Windows MSI installers for MySQL 5.7 had a 5.6 upgrade code,
not a 5.7 upgrade code. (Bug #16445344)
* SHOW ENGINE PERFORMANCE_SCHEMA STATUS could report incorrect
memory-allocation values when the correct values exceeded 4GB.
(Bug #16414644)
* Performance Schema statement tokenization overhead was
reduced. (Bug #16382260)
* A long database name in a GRANT statement could cause the
server to exit. (Bug #16372927)
* The server could exit if a prepared statement attempted to
create a table using the name of an existing view while an SQL
handler was opened. (Bug #16385711)
* For debug builds, checking of password constraints could raise
an assertion for statements that updated passwords. (Bug
#16289303)
* The BUILD-CMAKE file in MySQL distributions was updated with
the correct URL for CMake information. (Bug #16328024)
* A Valgrind failure could occur if a CREATE USER statement was
logged to the general query log and the old_passwords system
variable was set to 2. (Bug #16300620)
* The optimizer's attempt to remove redundant subquery clauses
raised an assertion when executing a prepared statement with a
subquery in the ON clause of a join in a subquery. (Bug
#16318585)
References: This bug is a regression of Bug #15875919.
* Very small join_buffer_size values could cause an assertion to
be raised. (Bug #16328373)
* Some aggregate queries attempted to allocate excessive memory.
(Bug #16343992)
* Incorrect results were returned if a query contained a
subquery in an IN clause which contained an XOR operation in
the WHERE clause. (Bug #16311231)
* For debug builds, an assertion could be raised if a statement
failed with autocommit enabled just before an XA START
statement was issued. (Bug #16341673)
* Conversion of numeric values to BIT could yield unexpected
results. (Bug #16271540)
* Certain legal HAVING clauses were rejected as invalid. (Bug
#16221433)
* Fixed warnings when compiling with XCode 4.6. Fixed warnings
when compiling when the _XOPEN_SOURCE or isoctal macro was
already defined in the environment. (Bug #16265300, Bug
#60911, Bug #12407384)
* Queries using range predicates that were evaluated using the
LooseScan semi-join strategy could return duplicate rows. (Bug
#16221623)
References: This bug is a regression of Bug #14728469.
* For upgrade operations, RPM packages produced unnecessary
errors about being unable to access .err files. (Bug
#16235828)
* In the range optimizer, an index merge failure could cause a
server exit. (Bug #16241773)
* For debug builds, the server could exit due to incorrect
calculation of applicable indexes for a join that involved
const tables. (Bug #16165832)
* The Performance Schema could return incorrect values for the
PROCESSLIST_INFO column of the threads table. (Bug #16215165)
* Invocation of the range optimizer for a NULL select caused the
server to exit. (Bug #16192219)
* mysql_config --libs displayed incorrect output. (Bug
#16200717)
* For a CREATE TABLE (... col_name TIMESTAMP DEFAULT
CURRENT_TIMESTAMP ...) ... SELECT statement for which the
SELECT did not provide a value for the TIMESTAMP column, that
column was set to '0000-00-00 00:00:00', not the current
timestamp. (Bug #16163936)
* yaSSL did not perform proper padding checks, but instead
examined only the last byte of plaintext and used it to
determine how many bytes to remove. (Bug #16218104)
* Using GROUP BY WITH ROLLUP in a prepared statement could cause
the server to exit. (Bug #16163596)
* References to the unused SIGNAL_WITH_VIO_SHUTDOWN macro in the
CMake files were removed. (Bug #16066150)
* Setting the slave_rows_search_algorithms system variable to an
inappropriate value could cause the server to exit. (Bug
#16074161)
* Directory name manipulation could result in stack overflow on
Mac OS X and Windows. (Bug #16066243)
* For debug builds, if the server was started with binary
logging disabled, executing SHOW RELAYLOG EVENTS from within a
stored procedure raised an assertion. (Bug #16043173)
* The query parser leaked memory for some syntax errors. (Bug
#16040022)
* With the thread pool plugin enabled, large numbers of
connections could lead to a Valgrind panic or failure of
clients to be able to connect. (Bug #16088658, Bug #16196591)
* The server executed EXPLAIN FORMAT=JSON for some malformed
queries improperly. (Bug #16078557)
* Performance Schema instrumentation was missing for slave
worker threads. (Bug #16083949)
* If the error for a failed CACHE INDEX statement index within a
stored program was processed by a condition handler, a
malformed packet and "Command out of sync" error occurred.
(Bug #16076180)
* The initial test database contained a dummy.bak file that
prevented DROP DATABASE from working. This file is no longer
included. Also, a db.opt file is now included that contains
these lines:
default-character-set=latin1
default-collation=latin1_swedish_ci
(Bug #16062056)
* Setting a system variable to DEFAULT could cause the server to
exit. (Bug #16044655)
* SET PASSWORD and GRANT ... IDENTIFIED BY have no effect on the
password of a user who is authenticated using an
authentication plugin that accesses passwords stored
externally to the mysql.user table. But attempts to change the
password of such a user produced no warning, leading to the
impression that the password had been changed when it was not.
Now MySQL issues an ER_SET_PASSWORD_AUTH_PLUGIN warning to
indicate that the attempt was ignored. (Bug #16072004)
* For debug builds, creating an InnoDB table in strict SQL mode
that violated the maximum key length limit caused the server
to exit. (Bug #16035659)
* Issuing a PREPARE statement using certain combinations of
stored functions and user variables caused the server to exit.
(Bug #16056537)
* Instances of #ifdef WITH_MYISAMMRG_STORAGE_ENGINE and #ifdef
WITH_CSV_STORAGE_ENGINE in the server source code were removed
because the CSV and MERGE storage engine plugins are
mandatory. (Bug #15997345)
* A mysys library string-formatting routine could mishandle
width specifiers. (Bug #15960005)
* The --character-set-server option could set connection
character set system variables to values such as ucs2 that are
not permitted. (Bug #15985752)
* During shutdown, the server could attempt to lock an
uninitialized mutex. (Bug #16016493)
* The --default-authentication-plugin option permitted invalid
plugin values, and did not always set the old_passwords system
variable to a value appropriate for the named plugin. (Bug
#16014394)
* For debug builds, executing a statement within a trigger or
stored function that caused an implicit commit raised an
assertion. (Bug #15985318)
* Under some circumstances, mysql --secure-auth permitted
passwords to be sent to the server using the old (pre-4.1)
hashing format. (Bug #15977433)
* With index condition pushdown enabled, queries for which the
pushed-down condition contained no columns in the used index
could be slow. (Bug #15896009)
* Table creation operations added entries to the Performance
Schema file_instances table, but these were not always removed
for table drop operations. (Bug #15927620)
* In special cases, the optimizer did not consider indexes that
were applicable to query processing, resulting in potentially
suboptimal execution and incorrect EXPLAIN output. (Bug
#15849135, Bug #16094171)
* A query with an EXISTS/IN/ALL/ANY subquery with an ORDER BY
clause ordering by an outer column of type BLOB that is not in
the select list caused an assertion to fire. (Bug #15875919)
References: See also Bug #14728142.
* Queries in the query cache involving a given table were
incorrectly invalidated if a TEMPORARY table of the same name
was dropped. (Bug #14839743)
* The optimizer could return nonmatching records for queries
that used ref access on string data types. (Bug #14826522)
References: See also Bug #14682735.
* Failure of CREATE SERVER due to a missing or read-only
mysql.servers table resulted in a memory leak. (Bug #14781478)
* Enabling the query cache during high client contention could
cause the server to exit. (Bug #14727815)
* Table names can be up to 64 characters, but the message string
for the ER_TABLE_NEEDS_REBUILD and ER_TABLE_NEEDS_UPGRADE
errors were truncating names longer than 32 characters. (Bug
#14753226)
* Enabling the slow query log at runtime when access permissions
on the log file prevented the server from writing to it caused
the server to exit. (Bug #14711347)
* Table removal could fail and cause the server to exit for very
long file names. (Bug #14581920)
* The server sometimes failed to respect
MAX_CONNECTIONS_PER_HOUR limits on user connections. (Bug
#14627287)
* The server could access the DEBUG_SYNC facility while closing
temporary tables during connection shutdown, after the
facility had been cleaned up, leading to an assertion being
raised. (Bug #14626800)
* The optimizer could return incorrect results after
transforming an IN subquery with aggregate functions to an
EXISTS subquery. (Bug #14586710)
* If the optimizer calculated a row count of zero for the inner
table of an outer join, it could not determine proper ordering
for the following tables. (Bug #14628746)
* When a client program loses the connection to the MySQL server
or if the server begins a shutdown after the client has
executed mysql_stmt_prepare(), the next mysql_stmt_prepare()
returns an error (as expected) but subsequent
mysql_stmt_execute() calls crash the client. (Bug #14553380)
* Previously, if multiple --login-path options were given,
mysql_config_editor ignored all but the last one. Now multiple
--login-path options result in an error. (Bug #14551712)
* If MySQL server was started with options to enable the general
query log or slow query log, but access permissions on the log
file prevented the server from writing to it, the server
started with an error message indicating that logging was off
and that the server needed to be restarted after the problem
was corrected. This was incorrect because it is also possible
to set the logging variables again at runtime (without a
restart) after correcting the problem. The error message now
indicates this possibility. (Bug #14512467)
* For debug builds, creating a TEMPORARY table inside a trigger
caused the server to exit. (Bug #14493938)
* SHOW COLUMNS on a view defined as a UNION of Geometry columns
could cause the server to exit. (Bug #14362617)
* The sha256_password_private_key_path and
sha256_password_public_key_path system variables indicate key
files for the sha256_password authentication plugin, but the
server failed to properly check whether the key files were
valid. Now in the event that either key file is invalid, the
server logs an error and exits. (Bug #14360513)
* SET var_name = VALUES(col_name) could cause the server to
exit. This syntax is now prohibited because in SET context
there is no column name and the statement returns
ER_BAD_FIELD_ERROR. (Bug #14211565)
* The COM_CHANGE_USER command in the client/server protocol did
not properly use the character set number in the command
packet, leading to incorrect character set conversion of other
values in the packet. (Bug #14163155)
* If the server was started with --skip-grant-tables, the CREATE
EVENT and ALTER EVENT statements resulted in a memory leak.
(Bug #14059662)
* Invoking the FORMAT() function with a locale and a very large
number could cause the server to exit. (Bug #14040155)
* For debug builds, improper handling for AUTO_INCREMENT value
overflow could cause the server to exit. (Bug #13875572)
* Certain plugin-related conditions can make a user account
unusable:
+ The account requires an authentication plugin that is not
loaded.
+ The account requires the sha256_password authentication
plugin but the server was started with neither SSL nor
RSA enabled as required by this plugin.
The server now checks those conditions by default and produces
warnings for unusable accounts. This checking slows down
server initialization and FLUSH PRIVILEGES, so it is made
optional by means of the new validate_user_plugins system
variable. This variable is enabled by default, but if you do
not require the additional checking, you can disable it at
startup to avoid the performance decrement. (Bug #13010061,
Bug #14506305)
* Passing an unknown time zone specification to CONVERT_TZ()
resulted in a memory leak. (Bug #12347040)
* The obsolete linuxthreads.txt and glibc-2.2.5.patch files in
the Docs directory of MySQL distributions have been removed.
(Bug #11766326)
* mysql_install_db did not escape '_' in the host name for
statements written to the grant tables. (Bug #11746817)
* The server could exit if built to permit a maximum number of
indexes per table larger than 64.
In the course of fixing this problem, a -DMAX_INDEXES=N CMake
option was added to permit building the server to support a
larger maximum number of indexes per table. The default is 64.
The maximum is 255. Values smaller than 64 are ignored and the
default of 64 is used. (Bug #11761614)
* Source code in the mysys library for the my_malloc_lock and
my_free_lock memory-locking APIs was never used and has been
removed. (Bug #54662, Bug #11762107)
* mysqld_safe used the nonportable -e test construct. (Bug
#67976, Bug #16046140)
* An out-of-memory condition could occur while handling an
out-of-memory error, leading to recursion in error handling.
(Bug #49514, Bug #11757464)
* The optimizer used loose index scan for some queries for which
this access method is inapplicable. (Bug #42785, Bug
#11751794)
* If a dump file contained a view with one character set and
collation defined on a view with a different character set and
collation, attempts to restore the dump file failed with an
"illegal mix of collations" error. (Bug #65382, Bug #14117025)
* If the server failed to read errmsg.sys, it could exit with a
segmentation fault. (Bug #53393, Bug #11760944)
* The REPLACE() function produced incorrect results when a user
variable was supplied as an argument and the operation was
performed on multiple rows. (Bug #49271, Bug #11757250)
* The output for SHOW CREATE VIEW could vary depending on the
DEFINER account privileges. (Bug #34553, Bug #11747931)
* UNION type conversion could incorrectly turn unsigned values
into signed values. (Bug #49003, Bug #11757005)
* If one thread was rebuilding a result for the query cache,
other threads in the middle of using the previous result could
fail to discard the old result properly. For debug builds,
this raised an assertion. (Bug #66781, Bug #14631798)
* UNION ALL on BLOB columns could produce incorrect results.
(Bug #50136, Bug #11758009)
* View access in low memory conditions could raise a debugging
assertion. (Bug #39307, Bug #11749556)
* Attempts to create a trigger for which a trigger with the same
action time and event already existed resulted in an
ER_NOT_SUPPORTED_YET error rather than an
ER_TRG_ALREADY_EXISTS error. (Bug #67357, Bug #14801721)
* Queries with many values in a IN() clause were slow due to
inclusion of debugging code in non-debugging builds. (Bug
#68046, Bug #16078212)
References: See also Bug #58731, Bug #11765737.
* When a view definition contained a special character in the
SEPARATOR clause of the GROUP_CONCAT() aggregate function,
mysqldump created an invalid view definition that produced an
error when the dump file was reloaded. (Bug #60920, Bug
#12395512)
* Setting max_connections to a value less than the current
number of open connections caused the server to exit. (Bug
#44100, Bug #11752803)
* Some table I/O performed by the server when calling a storage
engine were missing from the statistics collected by the
Performance Schema. (Bug #68180, Bug #16222630)
* For debug builds, some queries with SELECT ... FROM DUAL
nested subqueries raised an assertion. (Bug #60305, Bug
#11827369)
* Nonspatial indexes only support exact-match lookups for
spatial columns, but the optimizer incorrectly used range
access in some cases, leading to incorrect results. (Bug
#67889, Bug #15993693)
* If mysql is built with the bundled libedit library, the
library is built as static code, to avoid linking to a
different dynamic version at runtime. Dynamic linking could
result in use of a different, incompatible version and a
segmentation fault. (Bug #68231, Bug #16296509)
* SLEEP() produced no warning or error for NULL or negative
arguments. Now it produces a warning, or an error in strict
SQL mode. (Bug #67548, Bug #15859462)
* The --log-slow-admin-statements and
--log-slow-slave-statements command options now are exposed at
runtime as the log_slow_admin_statements and
log_slow_slave_statements system variables. Their values can
be examined using SHOW VARIABLES. The variables are dynamic,
so their values can can be set at runtime. (The options were
actually replaced by the system variables, but as system
variables can be set at server startup, no option
functionality is lost.) (Bug #59860, Bug #11766693)
* For arguments with fractional seconds greater than six
decimals, SEC_TO_TIME() truncated, rather than rounding as it
should have. (Bug #68061, Bug #16093024)
* MySQL failed to build if configured with WITH_LIBWRAP enabled.
(Bug #67018, Bug #16342793)
* If the server was started without a --datadir option, SHOW
VARIABLES could show an empty value for the datadir system
variable. (Bug #60995, Bug #12546953)
* If a table had rows in the
INFORMATION_SCHEMA.INNODB_CMP_PER_INDEX table, dropping the
table did not remove those rows. (Bug #67283, Bug #14779330)
* Configuring with -DWITH_SSL=/path/to/openssl resulted in link
errors due to selection of the incorrect libcrypto. (Bug
#68277, Bug #16284051)
* ALTER TABLE tbl_name ADD COLUMN col_name TIMESTAMP DEFAULT
CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP inserted
0000-00-00 00:00:00 rather than the current timestamp if the
alteration was done in place rather than by making a table
copy. (Bug #68040, Bug #16076089)
* If the server was started with --skip-grant-tables, ALTER USER
... PASSWORD EXPIRE caused the server to exit. (Bug #68300,
Bug #16295905)
* CMake did not check whether the system zlib had certain
functions required for MySQL, resulting in build errors. Now
it checks and falls back to the bundled zlib if the functions
are missing. (Bug #65856, Bug #14300733)
* mysql_install_db did not work in Solaris 10 sparse root zones.
(Bug #68117, Bug #16197860)
* For EXPLAIN DELETE and EXPLAIN UPDATE the possible_keys column
listed all indexes, not just the applicable indexes. (Bug
#67830, Bug #15972078)
* The Perl version of mysql_install_db mishandled some error
messages. (Bug #68118, Bug #16197542)
* Handling of SQL_CALC_FOUND_ROWS in combination with ORDER BY
and LIMIT could lead to incorrect results for FOUND_ROWS().
(Bug #68458, Bug #16383173)
* The server did not enforce the port or report_port upper limit
of 65,535 and truncated larger values. (Bug #67956, Bug
#16035522)
* Adding an ORDER BY clause following an IN subquery could cause
duplicate rows to be returned. (Bug #68330, Bug #16308085)
* If INET6_NTOA() or INET6_ATON() returned NULL for a row in a
result set, following rows also returned NULL. (Bug #68454,
Bug #16373973)
* If XA support was activated by multiple storage engines, the
server would exit. (Bug #47134, Bug #11755370)
* A statement with an aggregated, nongrouped outer query and an
aggregated, nongrouped subquery in the SELECT list could
return incorrect results. (Bug #68372, Bug #16325175)
* The SQL_NO_CACHE keyword is supposed to prevent the server
from checking the query cache to see whether the query result
is already cached, and to prevent it from caching the query
result. However, the query cache check was suppressed only if
SQL_NO_CACHE was preceded and followed by space characters.
(For example, the server checked the cache if the keyword was
followed by a newline.) Now the parser requires that the
preceding and following characters be whitespace characters,
not spaces. (Bug #64164, Bug #13641256)
* With explicit_defaults_for_timestamp enabled, inserting NULL
into a TIMESTAMP NOT NULL column now produces an error (as it
already did for other NOT NULL data types), instead of
inserting the current timestamp. (Bug #68472, Bug #16394472)
* Use of KILL to kill a statement in another session could in
some cases cause that session to return an incorrect error
code. (Bug #45679, Bug #11754124)
* If a column is declared as NOT NULL, it is not permitted to
insert NULL into the column or update it to NULL. However,
this constraint was enforced even if there was a BEFORE INSERT
(or BEFORE UPDATE trigger) that set the column to a non-NULL
value. Now the constraint is checked at the end of the
statement, per the SQL standard. (Bug #6295, Bug #11744964)
* On Windows, the log_error system variable did not accurately
reflect the error log file name in some cases. For example, if
the server was started without --console or --log-error, the
default is to log to host_name.err in the data directory, but
log_error remained blank.
Now log_error should be nonblank and reflect the log file name
in all cases, on all platforms. The value is stderr if the
server does not write error messages to a file and sends them
to the console (standard error output) instead. In particular,
on Windows, --console overrides use of an error log and sends
error messages to the console, so log_error will be set to
stderr. (Bug #8307, Bug #11745049)
* Important Change: Formerly, the ExtractValue() and UpdateXML()
functions supported a maximum length of 127 characters for
XPath expressions supplied to them as arguments. This
limitation has now been removed. (Bug #13007062, Bug #62429)
* InnoDB: Creating and altering tables repeatedly would result
in a memory leak that was due to a duplicate key error. The
duplicate key error occurred because the
row_merge_build_indexes function did not call
row_fts_psort_info_destroy often enough. As full-text search
indexes were created with a unique index, the unique index
would fail due to the duplicate key error, and full-text
search build resource would not be released. (Bug #14759111)
* InnoDB: InnoDB IO threads within Performance Schema were
exposed with the following name: "io_handler_thread". This fix
implements specific keys such as io_read_handler_thread,
io_write_handler_thread, io_ibuf_handler_thread to
differentiate InnoDB IO threads within Performance Schema.
(Bug #14670810)
* InnoDB: This fix addresses an assert condition that would
occur when inserting large BLOBs into tablespaces with a 4KB
physical page size or into some compressed tables. Extents
would not be allocated soon enough for tablespaces with
smaller physical page sizes. (Bug #14520559)
* InnoDB: On Linux systems, certain I/O requests that read or
wrote fewer than the requested number of bytes could cause the
server to crash. This issue could happen more frequently with
asynchronous I/O
(http://dev.mysql.com/doc/refman/5.7/en/glossary.html#glos_asy
nchronous_io) requests. The messages did not clearly identify
what type of error occurred:
InnoDB: Operating system error number 0 in a file operation.
InnoDB: Error number 0 means 'Success'.
With this fix, MySQL retries the operation several times
before giving up. (The number of retries is defined by the
constant NUM_RETRIES_ON_PARTIAL_IO in the source code, default
value 10.) (Bug #11761646, Bug #54160)
* Partitioning: When the server is started with
--skip-partition, it should reject DDL or DML statements on
partitioned tables. However, for DROP TABLE, the server
dropped the .frm file, and for RENAME TABLE, the server
renamed the .frm file. (Bug #11763795)
* Replication: mysqlbinlog did not properly decode DECIMAL
values in a row-based binary log. This could cause invalid
values to be printed out for DECIMAL columns. (Bug #14309019)
* Replication: When using mysqlbinlog with the --verbose option
to read a binary log written by a MySQL server using row-based
or mixed-format logging, invalid SQL could be produced when
comments appeared inside BINLOG statements. One way in which
this could happen was when a function that updated data was
used within an INSERT ... SELECT statement. (Bug #12889121)
* Replication: mysql_upgrade on the master broke replication
when the slave was run with --log-output equal to FILE or
NONE. (Bug #11763447)
* Replication: Issuing STOP SLAVE caused a spurious Error
reading packet from server: Lost connection to MySQL server
during query message to be written to the error log. (Bug
#11761457, Bug #12977988, Bug #53955)
* Replication: When an error occurs in the slave SQL thread,
this causes the Slave_SQL_Error and Slave_SQL_Errno columns
from SHOW SLAVE STATUS to display the reason for the error.
The error number should be one of the usual constants ER_*
defined in sql/share/errmsg.txt, and the error message should
be the corresponding string. However, in some cases,
Slave_SQL_Errno was set to something other than an ER_*
number, and Slave_SQL_Error to a hard-coded error message
rather than a translatable string from sql/share/errmsg.txt.
Now all errors shown by SHOW SLAVE STATUS originate in
sql/share/errmsg.txt, as expected. (Bug #11760365, Bug #52768)
* Microsoft Windows: On Microsoft Windows, CMake entries for
POSIX API's not found on Microsoft Windows were added to the
CMake cache. This decreases the number of expected "Not found"
errors while compiling MySQL. (Bug #14790333)
* Microsoft Windows: On Microsoft Windows, queries referring to
a table with invalid characters would search the system for
invalid file names. The generated system error code
(ERROR_INVALID_NAME) was not recognized by MySQL, so this
unknown error would be reported to the server log as "ERRNO:
22 - INVALID ARGUMENT". MySQL now recognizes these errors and
reports them as the table does not existing, and it no longer
logs them to the server error log. (Bug #14642248)
* Microsoft Windows: On Windows, starting the server with
--log-error and --console caused the server to write to the
log file but not the console. Before MySQL 5.5.3, this
occurred only if --log-error was specified after --console.
Now, --console overrides --log-error no matter the option
order so that --console produces console output in all cases.
(Bug #14207773, Bug #65592)
* Microsoft Windows: It was possible to specify a Named Pipe
(http://dev.mysql.com/doc/refman/5.7/en/server-options.html#op
tion_mysqld_enable-named-pipe) that was already in use. This
is no longer allowed, as an error is now emitted and the
process is aborted. After mysqld.exe was started in Named Pipe
mode with a pipe name that was already used by a different
instance, neither instance was able to shut down properly when
a shutdown command was received from a TCP socket in any of
the processes. Therefore, mysqld.exe was not terminated. (Bug
#13891058, Bug #61885)
* Microsoft Windows: On Microsoft Windows, a failed API or
function call in mysqld.exe could sometimes report the error
code 22, instead of the proper error code. (Bug #11763004)
* Joins of exactly 32 tables and containing a HAVING clause
returned an empty result. (Bug #15972635)
* The parser rejected some legal UNION statements. (Bug
#14730856)
* Setting thread_cache_size to a negative value at server
startup resulted in a value of 16384 rather than 0. (Bug
#14683107)
* The return value from IS_USED_LOCK() was reported using the
wrong data type. (Bug #14575699)
* There was no warning at startup if the server was started with
an invalid query_cache_size value. (Bug #14576423)
* Activation of a stored program handler did not preserve the
current diagnostics stack. (Bug #14342913)
* In debug builds, killing a HELP statement caused an assertion
to be raised. (Bug #14221840)
* If an error occurred during evaluation of the BEFORE
expression of a PURGE BINARY LOGS BEFORE statement, the
statement did not abort as it should have and later raised an
assertion. (Bug #14215847)
* For the index merge access method, the optimizer could make a
suboptimal choice of indexes to use. (Bug #14095506)
* An assertion could be raised if the attempt to open the .frm
file for a temporary table failed. (Bug #13359247)
* If the state of the Event Scheduler was changed during server
shutdown, the server could crash. (Bug #13002460)
* When storing the definition for a view that used the UPPER()
or LOWER() function, the function call was replaced by UCASE()
or LCASE(), respectively (as shown in the output of SHOW
CREATE VIEW). This was in spite of the fact that UPPER() and
LOWER() are standard, with UCASE() and LCASE() being MySQL
synonyms for these. This made it more difficult to move
databases between MySQL and other database systems.
With this fix, calls to UPPER() and LOWER() within views are
no longer rewritten when storing their definitions; instead,
UCASE() is now rewritten as UPPER() in stored view
definitions, and LCASE() as LOWER(), which increases the
portability of the views. (Bug #12844279)
* For queries that accessed an INFORMATION_SCHEMA table in a
subquery, and attempt to lock a mutex that had already been
locked could cause a server crash. (Bug #11765744)
* The Range checked for each record optimization is now used for
conditions with outer query references. (Bug #11750963)
* An INSERT INTO ... SELECT statement that inserted no rows
unnecessarily invalidated statements in the query cache that
used the target table. (Bug #50065, Bug #11757947)
* The server refused client connections while executing FLUSH
PRIVILEGES. (Bug #63178, Bug #13418619)
* References to a stored function without a database name
qualifier while there was no default database resulted in an
ER_SP_DOES_NOT_EXIST error rather than ER_NO_DB_ERROR. (Bug
#64692, Bug #13864485)
* Concurrent inserts were blocked by selects if the inserts were
generated from within a stored procedure. (Bug #58689, Bug
#11765698)
* Concurrent execution of DROP DATABASE and any of CREATE
FUNCTION, CREATE PROCEDURE, or CREATE EVENT could be written
to the binary log in the wrong order, causing replication
failure. (Bug #65428, Bug #14127220)
* INSERT INTO ... SELECT ... ON DUPLICATE KEY UPDATE and LOAD
DATA CONCURRENT REPLACE took too weak a lock, leading to the
possibility of concurrent SELECT statements returning
inconsistent results. (Bug #38046, Bug #11749055)
* If read_only is enabled, it is still permitted to create
TEMPORARY tables. But in this case, a non-TEMPORARY table with
the same name could also be created, which should not be
permitted. (Bug #64992, Bug #13969578)
* Enabling the session value of low_priority_updates had no
effect for INSERT statements. (Bug #64892, Bug #13939940)
* An event was not dropped from the mysql.event table under
these circumstances: The event was created while the event
scheduler was enabled; the scheduler was disabled and
re-enabled; the event expiration time was reached. (Bug
#34804, Bug #11748012)
* Using ALTER TABLE to rename a table to . resulted in a table
with no name. (Bug #49636, Bug #11757569)
* SHOW CREATE VIEW failed if the tables underlying the view were
changed. (Bug #61718, Bug #12762393)
* SHOW GLOBAL STATUS caused performance problems on busy servers
due to lock contention. (Bug #42930, Bug #11751904)
* For a view defined on a UNION, the server could create an
invalid view definition. (Bug #65388, Bug #14117018)
* For queries using ref access on string data types, the ref
access condition could be evaluated again as part of the query
condition or pushed down as an index condition to the storage
engine. (Bug #66983, Bug #14682735)
* For an ALTER TABLE statement that renamed or changed the
default value of a BINARY column, the alteration was done
using a table copy and not in place. (Bug #67141, Bug
#14735373)
* A view was created with an incorrect definition if the WHERE
clause contained string literals and character_set_client and
character_set_connection were set to different character sets.
(Bug #63094, Bug #13520710)
- Bjorn Munch
MySQL Release Engineering
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