MySQL Community Server 5.7.1 has been released (part 1)

[Bjørn Munch]

Dear MySQL users,

MySQL Server 5.7.1 (Milestone Release) is a new version of the world's
most popular open source database. This is the first milestone release
of MySQL 5.7.

http://dev.mysql.com/doc/mysql-development-cycle/en/development-milestone-releases.html

The new features in these releases are of Beta quality. As with any
other pre-production release, caution should be taken when installing
on production level systems or systems with critical data.

Note that 5.7.1 includes all features in MySQL 5.6.

For information on installing MySQL 5.7.1 on new servers, please see the
MySQL installation documentation at

http://dev.mysql.com/doc/refman/5.7/en/installing.html

MySQL Server 5.7.1 is available in source and binary form for a number of
platforms from the "Development Releases" selection of our download
pages at

http://dev.mysql.com/downloads/mysql/

The platforms and package formats available for MySQL 5.7.1 are the
same as for 5.6.

Windows packages are now available via the new Installer for Windows
Installer or .ZIP (no-install) packages for more advanced needs. It
should be noted that the previous MSI packaging is no longer available
and the point and click configuration wizards and all MySQL products
are now available in the unified Installer for Windows:

http://dev.mysql.com/downloads/installer/

Like the newly released MySQL 5.6.11, 5.7.1 also comes with a web
installer as an alternative to the full installer.

The web installer doesn't come bundled with any actual products
and instead relies on download-on-demand to fetch only the
products you choose to install. This makes the initial download
much smaller but increases install time as the individual products
will need to be downloaded.

We welcome and appreciate your feedback, bug reports, bug fixes,
patches, etc.:

http://bugs.mysql.com/report.php

The following section lists the changes in MySQL 5.7 since development
started, and bug fixes not already included in 5.6.10. It may also be
viewed online at

http://dev.mysql.com/doc/relnotes/mysql/5.7/en/news-5-7-1.html

Enjoy!

On behalf of the MySQL Build Team at Oracle,

- Bjorn Munch

[ Due to a 50K size limitation, this announcement is split in two
parts. This is part 1. ]

=======================================================================

Changes in MySQL 5.7.1 (23 April 2013, Milestone 11)

   Note

   This is a milestone release, for use at your own risk. Significant
   development changes take place in milestone releases and you may
   encounter compatibility issues, such as data format changes that
   require attention in addition to the usual procedure of running
   mysql_upgrade. For example, you may find it necessary to dump your
   data with mysqldump before the upgrade and reload it afterward.

   Functionality Added or Changed

     * Performance: String hashing overhead was reduced. This also
       improves performance for metadata locking, the table
       definition cache, and Performance Schema table I/O and file
       I/O instrumentation. (Bug #13944392)

     * Incompatible Change: SHOW ENGINE PERFORMANCE_SCHEMA STATUS
       output used a mix of row_count and count attributes. These are
       now all count. Similarly, the output used a mix of row_size
       and size attributes. These are now all size. (Bug #16165468)

     * InnoDB: Online index renaming is supported by ALTER TABLE,
       which now includes a RENAME INDEX clause, as shown in the
       following example: "ALTER TABLE t RENAME INDEX i1 TO i2",
       where i1 is the current name of the index and i2 is the new
       name.
       The result of "ALTER TABLE t RENAME INDEX i1 TO i2" would be a
       table with contents and structure that is identical to the old
       version of "t1" except for the index name, which is now "i2"
       instead of "i1".

     * InnoDB: You can now increase VARCHAR size online through ALTER
       TABLE ...ALGORITHM=INPLACE, CHANGE COLUMN...VARCHAR(). VARCHAR
       size may be increased from a value less than 255 bytes up to a
       value equal to or less than 255 bytes. You may also increase
       VARCHAR size online from a starting value greater than 255
       bytes (Bug#15863023).
       Note
       Decreasing VARCHAR size online is not supported, nor is
       increasing VARCHAR size online from a value less than 256
       bytes to a value greater than 256 bytes.

     * InnoDB: DDL performance for InnoDB temporary tables is
       improved through optimization of CREATE TABLE, DROP TABLE,
       TRUNCATE TABLE, ALTER TABLE ... IMPORT TABLESPACE, and ALTER
       TABLE ...DISCARD TABLESPACE statements.

     * InnoDB: Added support for spatial data types currently
       supported by MySQL including POINT, LINE_STRING, POLYGON,
       MULTI_POINT, MULTI_POLYGON, MULTI_LINE_STRING,
       GEOMETRY_COLLECTION, and GEOMETRY.
       Prior to this release, InnoDB would store spatial data, except
       for POINT, as binary BLOB data. BLOB remains the underlying
       data type but spatial data types are now mapped to a new
       InnoDB internal data type, DATA_GEOMETRY. With BLOB as the
       underlying data type, a prefix index can still be used on the
       GEOMETRY data column.

     * InnoDB: Added a separate tablespace for all non-compressed
       user and system-generated temporary tables. The new
       tablespace, which is always recreated on server startup,
       provides persistent storage for temporary table
       meta-information. Persistent meta-information enables proper
       cleanup in crash recovery scenarios. Additionally, a separate
       tablespace for temporary tables avoids having to store
       persistent meta-information in system tablespaces.
       The new tablespace, ibtmp1, is located in the /tmp directory
       by default. A newly added configuration file option,
       --innodb_temp_data_file_path, allows for a user-defined
       temporary data file path.

     * Replication: An Auto_Position column has been added to the
       output generated by SHOW SLAVE STATUS. The value of this
       column shows whether replication autopositioning is in use. If
       autopositioning is enabled---that is, if MASTER_AUTO_POSITION
       = 1 was set by the last successful CHANGE MASTER TO statement
       that was executed on the slave---then the column's value is 1;
       if not, then the value is 0. (Bug #15992220)

     * Replication: The functions GTID_SUBTRACT() and GTID_SUBSET()
       were formerly available in libmysqld only when it was built
       with replication support. Now these functions are always
       available when using this library, regardless of how it was
       built.

     * MySQL no longer uses the default OpenSSL compression. (Bug
       #16235681)

     * There is now a distinct error code
       (ER_MUST_CHANGE_PASSWORD_LOGIN) for the error sent by the
       server to a client authenticating with an expired password.
       (Bug #16102943)

     * In RPM packages built for Unbreakable Linux Network,
       libmysqld.so now has a version number. (Bug #15972480)

     * Error messages for ALTER TABLE statement using a LOCK or
       ALGORITHM value not supported for the given operation were
       very generic. The server now produces more informative
       messages. (Bug #15902911)

     * If a client with an expired password connected but
       old_passwords was not the value required to select the
       password hashing format appropriate for the client account,
       there was no way for the client to determine the proper value.
       Now the server automatically sets the session old_passwords
       value appropriately for the account password. (Bug #15892194)

     * mysql_config_editor now supports --port and --socket options
       for specifying TCP/IP port number and Unix socket file name.
       (Bug #15851247)

     * mysqldump now supports an --ignore-error option. The option
       value is a comma-separated list of error numbers specifying
       the errors to ignore during mysqldump execution. If the
       --force option is also given to ignore all errors, --force
       takes precedence. (Bug #15855723)

     * mysqlcheck has a new --skip-database option. The option value
       is the name of a database (case sensitive) for which checks
       should be skipped.
       mysql_upgrade uses this option to upgrade the system tables in
       the mysql database before tables in other databases: It
       upgrade the mysql database, then all databases except the
       mysql database. This avoids problems that can occur if user
       tables are upgraded before the system tables. (Bug #14697538)

     * The validate_password_policy_number system variable was
       renamed to validate_password_policy. (Bug #14588121)

     * Previously, on Linux the server failed to perform stack
       backtrace attempts for versions of glibc older than the
       current minimum supported version (2.3). Now on such attempts
       the server displays a message that the glibc version is too
       old to support backtracing. (Bug #14475946)

     * In JSON-format EXPLAIN output, the attached_condition
       information for subqueries now includes select# to indicate
       the relative order of subquery execution. (Bug #13897507)

     * The following changes were made to the sandbox mode that the
       server uses to handle client connections for accounts with
       expired passwords:

          + There is a new disconnect_on_expired_passwords system
            variable (default: enabled). This controls how the server
            treats expired-password accounts.

          + Two flags were added to the C API client library:
            MYSQL_OPT_CAN_HANDLE_EXPIRED_PASSWORDS for
            mysql_options() and CLIENT_CAN_HANDLE_EXPIRED_PASSWORDS
            for mysql_real_connect(). Each flag enables a client
            program to indicate whether it can handle sandbox mode
            for accounts with expired passwords.
            MYSQL_OPT_CAN_HANDLE_EXPIRED_PASSWORDS is enabled for
            mysqltest unconditionally, for mysql in interactive mode,
            and for mysqladmin if the first command is password.
       For more information about how the client-side flags interact
       with disconnect_on_expired_passwords, see Password Expiration
       and Sandbox Mode
       (http://dev.mysql.com/doc/refman/5.7/en/password-expiration.ht
       ml). (Bug #67568, Bug #15874023)

     * If a user attempted to access a nonexistent column for which
       the user had no access, the server returned an error
       indicating that the column did not exist. Now the server
       returns an error indicating that the user does not have
       privileges for the column, which provides no information about
       column existence. (Bug #19947, Bug #11745788)

     * The deprecated innodb_mirrored_log_groups system variable has
       been removed.

     * The mysql client now has a --syslog option that causes
       interactive statements to be sent to the system syslog
       facility. Logging is suppressed for statements that match the
       default "ignore" pattern list ("*IDENTIFIED*:*PASSWORD*"), as
       well as statements that match any patterns specified using the
       --histignore option. For more information, see mysql Logging
       (http://dev.mysql.com/doc/refman/5.7/en/mysql-logging.html).

     * ALTER TABLE now supports a RENAME INDEX clause that renames an
       index. The change is made in place without a table-copy
       operation. See ALTER TABLE Syntax
       (http://dev.mysql.com/doc/refman/5.7/en/alter-table.html).

     * Important Change; Replication: Added the --idempotent option
       for mysqlbinlog, which causes the MySQL Server to employ
       idempotent mode. This causes suppression of all duplicate-key
       and key-not-found errors when processing updates from the
       binary log. The mode is in effect for the current mysqlbinlog
       client and client session only.

     * Important Change; Replication: SHOW SLAVE STATUS when run
       concurrently with STOP SLAVE can take a long time to execute
       if the slave SQL thread was in the midst of applying a large
       update. To fix this problem, a new NONBLOCKING option has been
       added to the SHOW SLAVE STATUS statement. When this option is
       used, SHOW SLAVE STATUS does not wait on the SQL or I/O
       threads but returns immediately. This means that the reported
       states of these threads may not be completely up to date when
       the option is used. NONBLOCKING is intended primarily for use
       by monitoring tools in which obtaining an immediate response
       is more important than having the most timely data.

     * Microsoft Windows: Windows Vista, Windows Server 2008, and
       newer support native symlinking using the mklink command. This
       makes the MySQL Server implementation of database symbolic
       links using .sym files redundant, so that mechanism is now
       removed. This change has the following implications:

          + Existing .sym files are now ignored. Database symlinks
            should be recreated using mklink. See Using Symbolic
            Links for Databases on Windows
            (http://dev.mysql.com/doc/refman/5.7/en/symbolic-links.ht
            ml#windows-symbolic-links).

          + The --symbolic-links and --skip-symbolic-links options
            and the have_symlink system variable now are meaningful
            only for Unix systems, and not for Windows.

     * The server now issues a warning if an index is created that
       duplicates an existing index, or an error in strict SQL mode.
       (Bug #37520, Bug #11748842)

     * Previously, Control+C in mysql interrupted the current
       statement if there was one, or exited mysql if not. Now
       Control+C interrupts the current statement if there was one,
       or cancels any partial input line otherwise, but does not
       exit. (Bug #66583, Bug #14554568)

     * The mysql_clear_password cleartext client-side authentication
       plugin is intended for authentication schemes that require the
       server to receive the password as entered on the client side,
       without hashing. Because the password is sent in the clear,
       this plugin should be used within the context of a secure
       connection, such as an SSL connection, to avoid exposing the
       password over the network. To make inadvertent use of this
       plugin less likely, it is now required that clients explicitly
       enable it. This can be done several ways:

          + Set the LIBMYSQL_ENABLE_CLEARTEXT_PLUGIN environment
            variable to a value that begins with 1, Y, or y. This
            enables the plugin for all client connections.

          + The mysql, mysqladmin, and mysqlslap client programs
            support an --enable-cleartext-plugin option that enables
            the plugin on a per-invocation basis.

          + The mysql_options() C API function supports a
            MYSQL_ENABLE_CLEARTEXT_PLUGIN option that enables the
            plugin on a per-connection basis. Also, any program that
            uses libmysqlclient and reads option files can enable the
            plugin by including an enable-cleartext-plugin option in
            an option group read by the client library.

     * INSERT DELAYED is no longer supported. The server recognizes
       but ignores the DELAYED keyword, handles the insert as a
       nondelayed insert, and generates an
       ER_WARN_LEGACY_SYNTAX_CONVERTED warning. ("INSERT DELAYED is
       no longer supported. The statement was converted to INSERT.").
       Similarly, REPLACE DELAYED is handled as a nondelayed replace.
       The DELAYED keyword will be removed in a future release.
       In addition, several DELAYED-related options or features were
       removed:

          + The --delayed-insert option for mysqldump.

          + The COUNT_WRITE_DELAYED, SUM_TIMER_WRITE_DELAYED,
            MIN_TIMER_WRITE_DELAYED, AVG_TIMER_WRITE_DELAYED, and
            MAX_TIMER_WRITE_DELAYED columns of the Performance Schema
            table_lock_waits_summary_by_table table.
            If you upgrade to this release of MySQL from an earlier
            version, you must run mysql_upgrade (and restart the
            server) to incorporate these changes into the
            performance_schema database.

          + mysqlbinlog no longer writes comments mentioning INSERT
            DELAYED.

     * MySQL now supports stacked diagnostics areas and GET STACKED
       DIAGNOSTICS can be used during condition handler activation to
       retrieve information from the diagnostics area that was
       current before the handler was activated. This enables
       handlers to inspect information about the condition that
       caused the handler to activate. As before, GET [CURRENT]
       DIAGNOSTICS still retrieves information about the current
       diagnostics area and can be used even if no handler is active.
       For more information, see GET DIAGNOSTICS Syntax
       (http://dev.mysql.com/doc/refman/5.7/en/get-diagnostics.html).

   Bugs Fixed

     * Performance; InnoDB: The DROP TABLE statement for a table
       using compression
       (http://dev.mysql.com/doc/refman/5.7/en/glossary.html#glos_com
       pression) could be slower than necessary, causing a stall for
       several seconds. MySQL was unnecessarily decompressing pages
       (http://dev.mysql.com/doc/refman/5.7/en/glossary.html#glos_pag
       e) in the buffer pool
       (http://dev.mysql.com/doc/refman/5.7/en/glossary.html#glos_buf
       fer_pool) related to the table as part of the DROP operation.
       (Bug #16067973)

     * Incompatible Change; Partitioning: Changes in the KEY
       partitioning hashing functions used with numeric, date and
       time, ENUM, and SET columns in MySQL 5.5 makes tables using
       partitioning or subpartitioning by KEY on any of the affected
       column types and created on a MySQL 5.5 or later server
       incompatible with a MySQL 5.1 server. This is because the
       partition IDs as calculated by a MySQL 5.5 or later server
       almost certainly differ from those calculated by a MySQL 5.1
       server for the same table definition and data as a result of
       the changes in these functions.
       The principal changes in the KEY partitioning implementation
       in MySQL 5.5 resulting in this issue were as follows: 1. The
       hash function used for numeric and date and time columns
       changed from binary to character-based. 2. The base used for
       hashing of ENUM and SET columns changed from latin1 ci
       characters to binary.
       The fix involves adding the capability in MySQL 5.5 and later
       to choose which type of hashing to use for KEY partitioning,
       which is implemented with a new ALGORITHM extension to the
       PARTITION BY KEY option for CREATE TABLE and ALTER TABLE.
       Specifying PARTITION BY KEY ALGORITHM=1 ([columns]) causes the
       server to use the hashing functions as implemented in MySQL
       5.1; using ALGORITHM=2 causes the server to use the hashing
       functions from MySQL 5.5 and later. ALGORITHM=2 is the
       default. Using the appropriate value for ALGORITHM, you can
       perform any of the following tasks:

          + Create KEY partitioned tables in MySQL 5.5 and later that
            are compatible with MySQL 5.1, using CREATE TABLE ...
            PARTITION BY KEY ALGORITHM=1 (...).

          + Downgrade KEY partitioned tables that were created in
            MySQL 5.5 or later to become compatible with MySQL 5.1,
            using ALTER TABLE ... PARTITION BY KEY ALGORITHM=1 (...).

          + Upgrade KEY partitioned tables originally created in
            MySQL 5.1 to use hashing as in MySQL 5.5 and later, using
            ALTER TABLE ... PARTITION BY KEY ALGORITHM=2 (...).
            Important: After such tables are upgraded, they cannot be
            used any longer with MySQL 5.1 unless they are first
            downgraded again using ALTER TABLE ... PARTITION BY KEY
            ALGORITHM=1 (...) on a MySQL server supporting this
            option.
       This syntax is not backward compatible, and causes errors in
       older versions of the MySQL server. When generating CREATE
       TABLE ... PARTITION BY KEY statements, mysqldump brackets any
       occurrence of ALGORITHM=1 or ALGORITHM=2 in conditional
       comments such that it is ignored by a MySQL server whose
       version is not at least 5.5.31. An additional consideration
       for upgrades is that MySQL 5.6 servers prior to MySQL 5.6.11
       do not ignore the ALGORITHM option in such statements when
       generated by a MySQL 5.5 server, due to the that the
       conditional comments refer to version 5.5.31; in this case,
       you must edit the dump manually and remove or comment out the
       option wherever it occurs before attempting to load it into a
       MySQL 5.6.10 or earlier MySQL 5.6 server. This is not an issue
       for dumps generated by MySQL 5.6.11 or later version of
       mysqldump, where the version used in such comments is 5.6.11.
       For more information, see ALTER TABLE Partition Operations
       (http://dev.mysql.com/doc/refman/5.7/en/alter-table-partition-
       operations.html).
       As part of this fix, a spurious assertion by InnoDB that a
       deleted row had previously been read, causing the server to
       assert on delete of a row that the row was in the wrong
       partition, was also removed. (Bug #14521864, Bug #66462, Bug
       #16093958, Bug #16274455)
       References: See also Bug #11759782.

     * Important Change; Plugin API; Replication: Because the
       behavior of the fulltext plugin may vary between MySQL
       servers, it is not possible to guarantee that statements using
       this plugin produce the same results on masters and slaves.
       For this reason, statements depending on the fulltext plugin
       are now marked as unsafe for statement-based logging. This
       means that such statements are logged using row format when
       binlog_format=MIXED, and cause a warning to be generated when
       binlog_format=STATEMENT. (Bug #11756280, Bug #45449)

     * Important Change; Replication: Executing a statement that
       performs an implicit commit but whose changes are not logged
       when gtid_next is set to any value other than AUTOMATIC is not
       permitted. Now in such cases, the statement fails with an
       error. This includes the statements in the following list:

          + CHANGE MASTER TO

          + START SLAVE

          + STOP SLAVE

          + REPAIR TABLE

          + OPTIMIZE TABLE

          + ANALYZE TABLE

          + CHECK TABLE

          + CREATE SERVER

          + ALTER SERVER

          + DROP SERVER

          + CACHE INDEX

          + LOAD INDEX INTO CACHE

          + FLUSH

          + RESET
       (Bug #16062608)
       References: See also Bug #16484323.

     * Important Change; Replication: The version number reported by
       mysqlbinlog --version has been increased to 3.4. (Bug
       #15894381, Bug #67643)

     * Important Change; Replication: The lettercasing used for
       displaying UUIDs in global transaction identifiers was
       inconsistent. Now, all GTID values use lowercase, including
       those shown in the Retrieved_Gtid_Set and Executed_Gtid_Set
       columns from the output of SHOW SLAVE STATUS. (Bug #15869441)

     * Important Note; Replication: It was possible to replicate from
       a table to a same-named view using statement-based logging,
       while using row-based logging instead led to a failure on the
       slave. Now the target object type is checked prior to
       performing any DML, and an error is given if the target on the
       slave is not actually a table. This is true regardless of the
       binary logging format in use. (Bug #11752707, Bug #43975)

     * InnoDB: When parsing a delimited search string such as
       "abc-def" in a full-text search, InnoDB now uses the same word
       delimiters as MyISAM. (Bug #16419661)

     * InnoDB: This fix improves code readability by addressing
       naming inconsistencies for InnoDB PERFORMANCE_SCHEMA key
       declarations. (Bug #16414044)

     * InnoDB: This fix disables a condition for extra splitting of
       clustered index leaf pages, on compressed tables. Extra page
       splitting was only done to reserve space for future updates,
       so that future page splits could be avoided. (Bug #16401801)

     * InnoDB: For InnoDB tables, if a PRIMARY KEY on a VARCHAR
       column (or prefix) was empty, index page compression could
       fail. (Bug #16400920)

     * InnoDB: Status values in the INNODB_FT_CONFIG table would not
       update. The INNODB_FT_CONFIG is intended for internal
       configuration and should not be used for statistical
       information purposes. To avoid confusion, column values that
       are intended for internal use have been removed from the
       INNODB_FT_CONFIG table. This fix also removes the
       INNODB_FT_INSERTED table and other internal full text
       search-related tables that were unintentionally exposed. (Bug
       #16409494)

     * InnoDB: With innodb_api_enable_mdl=OFF, an ALTER TABLE
       operation on an InnoDB table that required a table copy could
       cause a server exit. (Bug #16287411)

     * InnoDB: Improper testing of compatibility between the
       referencing and referenced during ALTER TABLE ... ADD FOREIGN
       key could cause a server exit. (Bug #16330036)

     * InnoDB: Rollback did not include changes made to temporary
       tables by read-only transactions. (Bug #16310467)

     * InnoDB: The InnoDB page-splitting algorithm could recurse
       excessivly. (Bug #16345265)

     * InnoDB: For debug builds, InnoDB status exporting was subject
       to a race condition that could cause a server exit. (Bug
       #16292043)

     * InnoDB: When using ALTER TABLE to set an AUTO_INCREMENT column
       value to a user-specified value, InnoDB would set the
       AUTO_INCREMENT value to the user-specified value even when the
       AUTO_INCREMENT value is greater than the user-specified value.
       This fix ensures that the AUTO_INCREMENT value is set to the
       maximum of the user-specified value and
       MAX(auto_increment_column)+1, which is the expected behaviour.
       (Bug #16310273)

     * InnoDB: Importing a tablespace with the configuration file
       present would not import the data file. This problem would
       occur when all pages are not flushed from the buffer pool
       after a table is altered using the copy and rename approach.
       This fix ensures that all pages are flushed from the buffer
       pool when a table is altered using the copy and rename
       approach. (Bug #16318052)

     * InnoDB: The lock_validate function, which is only present in
       debug builds, acquired and released mutexes to avoid hogging
       them. This behavior introduced a window wherein changes to the
       hash table could occur while code traversed the same set of
       data. This fix updates lock_validate logic to collect all
       records for which locks must be validated, releases mutexes,
       and runs a loop to validate record locks. (Bug #16235056)

     * InnoDB: ALTER TABLE functions would perform a check to see if
       InnoDB is in read-only mode (srv_read_only_mode=true). If
       InnoDB was in read-only mode, the check would return a
       successful status and do nothing else. This fix replaces
       srv_read_only_mode check conditions with debug assertions.
       (Bug #16227539)

     * InnoDB: An improper call to abort() by InnoDB could result in
       a server exit. (Bug #16263506)

     * InnoDB: When the InnoDB buffer pool is almost filled with 4KB
       compressed pages, inserting into 16KB compact tables would
       cause 8KB pages_free to increase, which could potentially slow
       or stall inserts. (Bug #16223169)

     * InnoDB: An assertion failure would occur in heap->magic_n ==
       MEM_BLOCK_MAGIC_N due to a race condition that appeared when
       row_merge_read_clustered_index() returned an error. (Bug
       #16275237)

     * InnoDB: This fix removes an unnecessary debug assertion
       related to page_hash locks which only affects debug builds.
       The debug assertion is no longer valid and should have been
       removed when hash_lock array was introduced in MySQL 5.6. (Bug
       #16263167)

     * InnoDB: Without warning, InnoDB would silently set
       innodb-buffer-pool-instances to 1 if the buffer pool size is
       less than 1GB. For example, if innodb-buffer-pool-size is set
       to 200M and innodb-buffer-pool-instances is set to 4, InnoDB
       would silently set innodb-buffer-pool-instances to 1. This fix
       implements a warning message and new logic for
       innodb-buffer-pool-size and innodb-buffer-pool-instances. (Bug
       #16249500, Bug #61239)

     * InnoDB: When the primary key of a table includes a column
       prefix, and a full-text index is defined on the table, a
       full-text search resulted in an unnecessary warning being
       written to the error log. This fix suppresses the unnecessary
       warning. (Bug #16169411)

     * InnoDB: When InnoDB locking code was revised, a call to
       register lock waits was inadvertently removed. This fix adds
       the call back to the InnoDB locking code. (Bug #16208201)

     * InnoDB: A direct call to the trx_start_if_not_started_xa_low()
       function would cause a debug assertion. (Bug #16178995)

     * InnoDB: In the case of LOCK WAIT for an insert in a foreign
       key table, InnoDB could report a false dictionary-changed
       error and cause the insert to fail rather than being retried.
       (Bug #16174255)

     * InnoDB: In some cases, deadlock detection did not work,
       resulting in sessions hanging waiting for a lock-wait timeout.
       (Bug #16169638)

     * InnoDB: An in-place ALTER TABLE on an InnoDB table could fail
       to delete the statistics for the old primary key from the
       mysql.innodb_index_stats table. (Bug #16170451)

     * InnoDB: This fix updates InnoDB code in ha_innodb.cc and
       handler0alter.cc to use TABLE::key_info instead of both
       TABLE::key_info and TABLE_SHARE::key_info. (Bug #16215361)

     * InnoDB: Arithmetic underflow during page compression for
       CREATE TABLE on an InnoDB table could cause a server exit.
       (Bug #16089381)

     * InnoDB: LOCK_TIME would not be logged correctly in the slow
       query log. LOCK_TIME did not account for InnoDB row lock wait
       time. (Bug #16097753)

     * InnoDB: For debug builds, online ALTER TABLE operations for
       InnoDB tables could cause a server exit during table
       rebuilding. (Bug #16063835)

     * InnoDB: In some cases, the InnoDB purge coordinator did not
       use all available purge threads, resulting in suboptimal purge
       activity. (Bug #16037372)

     * InnoDB: ALTER TABLE for InnoDB tables was not fully atomic.
       (Bug #15989081)

     * InnoDB: This fix replaces most uses of UT_SORT_FUNCTION_BODY,
       an InnoDB recursive merge sort, with the std::sort() function
       from the C++ Standard Template Library (STL). The std::sort()
       function requires less memory and is faster due to in-line
       execution. (Bug #15920744)

     * InnoDB: This fix implements a 256-byte boundary for extending
       a VARCHAR column instead of 256-character boundary. This
       change allows for in-place extension of a VARCHAR column
       through an update of the data dictionary. (Bug #15863023)

     * InnoDB: This fix addresses unnecessary buffer pool lookups
       that would occur while freeing blob pages, and implements a
       debug status instrument, innodb_ahi_drop_lookups, for testing
       purposes. (Bug #15866009)

     * InnoDB: Due to a resource related bug, creating numerous
       tables that have a simple a full-text search index would cause
       excessive memory usage. This fix adds a global configuration
       parameter to limit the total memory size that full-text search
       indexes can use. If the global memory limit is reached by an
       index operation, a force sync is triggered. (Bug #14834698)

     * InnoDB: This fix modifies InnoDB code to ensure that unused
       thread handles are closed when the thread exits, instead of
       leaving thread handles open until shutdown of mysqld on
       Windows. (Bug #14762796)

     * InnoDB: This fix removes unnecessary overhead by removing
       table locking and disabling read view creation and MVCC when
       InnoDB is started in read-only mode (--innodb-read-only=true).
       (Bug #14729365)

     * InnoDB: An error at the filesystem level, such as too many
       open files, could cause an unhandled error during an ALTER
       TABLE operation. The error could be accompanied by Valgrind
       warnings, and by this assertion message:
Assertion `! is_set()' failed.
mysqld got signal 6 ;
       (Bug #14628410, Bug #16000909)

     * InnoDB: The INNODB_SYNC_ARRAY_SIZE variable was incorrectly
       allowed to be configured at runtime. As documented,
       INNODB_SYNC_ARRAY_SIZE must be configured when the MySQL
       instance is starting up, and cannot be changed afterward. This
       fix changes INNODB_SYNC_ARRAY_SIZE to a non-dynamic variable,
       as intended. (Bug #14629979)

     * InnoDB: The server could exit during an attempt by InnoDB to
       reorganize or compress a compressed secondary index page. (Bug
       #14606334)

     * InnoDB: A DML operation performed while a RENAME TABLE
       operation waits for pending I/O operations on the tablespace
       to complete would result in a deadlock. (Bug #14556349)

     * InnoDB: Attempting to unninstall the InnoDB memcached Plugin
       while the plugin is still installing caused the Mysql server
       to terminate. While the plugin deamon thread was still
       initializing, plugin variables were not yet set and the
       uninstall process could not cleanup resources. This fix adds a
       variable to indicate initialization status. If initialization
       is incomplete, the uninstall process will wait. (Bug
       #14279541)

     * InnoDB: If the value of innodb_force_recovery was less than 6,
       opening a corrupted table might loop forever if a corrupted
       page was read when calculating statistics for the table.
       Information about the corrupted page was written repeatedly to
       the error log, possibly causing a disk space issue. The fix
       causes the server to halt after a fixed number of failed
       attempts to read the page. To troubleshoot such a corruption
       issue, set innodb_force_recovery=6 and restart. (Bug
       #14147491, Bug #65469)

     * InnoDB: When printing out long semaphore wait diagnostics,
       sync_array_cell_print() ran into a segmentation violation
       (SEGV) caused by a race condition. This fix addresses the race
       condition by allowing the cell to be freed while it is being
       printed. (Bug #13997024)

     * InnoDB: Killing a query caused an InnoDB assertion failure
       when the same table (cursor) instance was used again. This is
       the result of a regression error introduced by the fix for
       Bug#14704286. The fix introduced a check to handle kill
       signals for long running queries but the cursor was not
       restored to the proper state. (Bug #68051, Bug #16088883)

     * InnoDB: On startup, InnoDB reported a message on 64-bit Linux
       and 64-bit Windows systems stating that the CPU does not
       support crc32 instructions. On Windows, InnoDB does not use
       crc32 instructions even if supported by the CPU. This fix
       revises the wording of the message and implements a check for
       availability of crc32 instructions. (Bug #68035, Bug
       #16075806)

     * InnoDB: The length of internally generated foreign key names
       was not checked. If internally generated foreign key names
       were over the 64 character limit, this resulted in invalid DDL
       from SHOW CREATE TABLE. This fix checks the length of
       internally generated foreign key names and reports an error
       message if the limit is exceeded. (Bug #44541, Bug #11753153)

     * InnoDB: This fix removes left-over prototype code for
       srv_parse_log_group_home_dirs, and related header comments.
       (Bug #68133, Bug #16198764)

     * InnoDB: Attempting to replace the default InnoDB FTS stopword
       list by creating an InnoDB table with the same structure as
       INFORMATION_SCHEMA.innodb_ft_default_stopword would result in
       an error. SHOW CREATE TABLE revealed that the new InnoDB table
       was created with CHARSET=utf8. The InnoDB FTS stopword table
       validity check only supported latin1. This fix extends the
       validity check for all supported character sets. (Bug #68450,
       Bug #16373868)

     * Partitioning: A query on a table partitioned by range and
       using TO_DAYS() as a partitioing function always included the
       first partition of the table when pruning. This happened
       regardless of the range employed in the BETWEEN clause of such
       a query. (Bug #15843818, Bug #49754)

     * Partitioning: Partition pruning is now enabled for tables
       using a storage engine that provides automatic partitioning,
       such as the NDB storage engine, but which are explicitly
       partitioned. Previously, pruning was disabled for all tables
       using such a storage engine, whether or not the tables had
       explicitly defined partitions.
       In addition, as part of this fix, explicit partition selection
       is now disabled for tables using a storage engine (such as
       NDB) that provides automatic partitioning. (Bug #14827952)
       References: See also Bug #14672885.

     * Partitioning: Execution of ALTER TABLE ... DROP PARTITION
       against a view caused the server to crash, rather than fail
       with an error as expected. (Bug #14653504)

     * Partitioning: A query result was not sorted if both DISTINCT
       and ORDER BY were used and the underlying table was
       partitioned. (Bug #14058167)

     * Partitioning: Inserting any number of rows into an ARCHIVE
       table that used more than 1000 partitions and then attempting
       to drop the table caused the MySQL Server to fail. (Bug
       #13819630, Bug #64580)

     * Replication; Linux; Microsoft Windows: Replication failed
       between a Linux master using lower_case_table_names set to 0
       and a Windows slave having lower_case_table_names set to 2,
       after a replicated table was opened on the slave; in addition,
       FLUSH TABLES was required afterwards to see which updates had
       actually been applied on the slave. This was because
       lower_case_table_names was checked only to see whether it was
       equal to 1 prior to forcing a conversion of replicated
       database object names to lower case for checking the table
       cache. Now in such cases, lower_case_table_names is checked to
       see whether it is set to a nonzero value. (Bug #16061982)

     * Replication: When using GTIDs and binary log auto-positioning,
       the master had to scan all binary logs whenever the slave
       reconnected (due to reasons such as I/O thread failure or a
       change of master) before it could send any events to slave.
       Now, the master starts from the oldest binary log that
       contains any GTID not found on the slave. (Bug #16340322, Bug
       #68386)

     * Replication: When the server version of the master was greater
       than or equal to 10, replication to a slave having a lower
       server version failed. (Bug #16237051, Bug #68187)

     * Replication: When replicating to a MySQL 5.6 master to an
       older slave, Error 1193 (ER_UNKNOWN_SYSTEM_VARIABLE) was
       logged with a message such as Unknown system variable
       'SERVER_UUID' on master, maybe it is a *VERY OLD MASTER*. This
       message has been improved to include more information, similar
       to this one: Unknown system variable 'SERVER_UUID' on master.
       A probable cause is that the variable is not supported on the
       master (version: 5.5.31), even though it is on the slave
       (version: 5.6.11). (Bug #16216404, Bug #68164)

     * Replication: A zero-length name for a user variable (such as
       @``) was incorrectly considered to be a sign of data or
       network corruption when reading from the binary log. (Bug
       #16200555, Bug #68135)

     * Replication: Running SHOW RELAYLOG EVENTS at a slave where no
       relay log file is present returned the following incorrect
       error message: "Error when executing command SHOW BINLOG
       EVENTS: Could not find target log." The error message text has
       been changed to: "Error when executing command SHOW RELAYLOG
       EVENTS: Could not find target log." (Bug #16191895)

     * Replication: When MTS is on and transactions are being
       applied, the slave coordinator would hang when encountering a
       checksum error on a transaction event. This was due to a
       deadlock situation in which the coordinator assumed a normal
       stop while a worker waited for the coordinator to dispatch
       more events. For debug builds, the problem appeared as an
       assertion failure, which was due to the coordinator not
       setting thd->is_error() when encountering an error. (Bug
       #16210351)

     * Replication: The print format specifier for the server_id was
       incorrectly defined as a signed 32-bit integer with a range of
       -2144783647 to 2144783648. This fix changes the server_id
       integer type to an unsigned 32-bit integer type, with a range
       of 0 to 4294967295, which is the documented range for the
       --server-id option. (Bug #16210894)

     * Replication: mysqlbinlog can connect to a remote server and
       read its binary logs. In MySQL 5.6 and later, this tool can
       also wait for the server to generate and send additional
       events, in practice behaving like a slave connecting to a
       master. In cases where the server sent a heartbeat,
       mysqlbinlog was unable to handle it properly. As a
       consequence, mysqlbinlog failed at this point, without reading
       any more events from the server. To fix this problem,
       mysqlbinlog now ignores any binary log events of type
       HEARTBEAT_LOG_EVENT that it receives. (Bug #16104206)

     * Replication: STOP SLAVE could cause a deadlock when issued
       concurrently with a statement such as SHOW STATUS that
       retrieved the values for one or more of the status variables
       Slave_retried_transactions, Slave_heartbeat_period,
       Slave_received_heartbeats, Slave_last_heartbeat, or
       Slave_running. (Bug #16088188, Bug #67545)
       References: See also Bug #16088114.

     * Replication: Using the --replicate-* options (see Replication
       Slave Options and Variables
       (http://dev.mysql.com/doc/refman/5.7/en/replication-options-sl
       ave.html)) could in some cases lead to a memory leak on the
       slave. (Bug #16056813, Bug #67983)

     * Replication: Backtick (`) characters were not always handled
       correctly in internally generated SQL statements, which could
       sometimes lead to errors on the slave. (Bug #16084594, Bug
       #68045)
       References: This bug is a regression of Bug #14548159, Bug
       #66550.

     * Replication: The session-level value for gtid_next was
       incorrectly reset on the slave for all rollbacks, which meant
       that GTIDs could be lost for multi-statement transactions,
       causing the slave to stop with an
       ER_GTID_NEXT_TYPE_UNDEFINED_GROUP error. Now this is done only
       when a complete transaction is being rolled back, or when
       autocommit is enabled. (Bug #16084206)

     * Replication: In order to provision or to restore a server
       using GTIDs, it is possible to set gtid_purged to a given GTID
       set listing the transactions that were imported. This
       operation requires that the global gtid_executed and
       gtid_purged server system variables are empty. (This is done
       in order to avoid the possibility of overriding
       server-generated GTIDs.)
       The error message GTID_PURGED can only be set when
       GTID_EXECUTED is empty that was raised when this requirement
       was not met could be confusing or misleading because it did
       not specify the scope of the affected variables. To prevent
       this from happening, error messages that refer to variables
       relating to GTIDs now specify the scope of any such variables
       when they do so. (Bug #16084426, Bug #68038)

=== END PART 1 ===

Part 2 will follow.