* Previously, MySQL Server distributions included the MySQL Reference Manual in Info format (the Docs/mysql.info file). Because the license for the manual restricts redistribution, its inclusion in Community packages caused problems for downstream redistributors, such as those who create Linux distributions. Community distributions of MySQL Server no longer include the mysql.info file, to make the repackaging and redistribution process easier (for example, the source tarball and its checksum can be used directly). This change applies to all source and binary Community packaging formats. Commercial (Enterprise) distributions are unchanged.
* Incompatible Change: Several statement instruments in the setup_instruments table are used by the Performance Schema during the early stages of statement classification before the exact statement type is known.
* The Performance Schema now instruments the read/write lock Delegate::lock
* A new CMake option, WITH_ASAN, permits enabling address sanitization for compilers that support it.
* The hash function used for metadata locking was modified to reduce overhead.
* Bugs Fixed
* MySQL 5.7 changed audit log file output to a new format that has better compatibility with Oracle Audit Vault. This format has been backported to MySQL 5.6 and it is possible to select either the old or new format using the new audit_log_format system variable, which has permitted values of OLD and NEW (default OLD). For details about each format, see The Audit Log File.
* Important Change; Replication: START SLAVE UNTIL SQL_AFTER_GTIDS did not cause the slave to stop until the next GTID event was received following execution of the transaction having the indicated GTID, which could cause issues in the case when the next GTID event is delayed, or does not exist. Now the slave stops after completing the transaction with that GTID.
* InnoDB; Partitioning: Following any query on the INFORMATION_SCHEMA.PARTITIONS table, InnoDB index statistics as shown in the output of statements such as SELECT * FROM INFORMATION_SCHEMA.STATISTICS were read from the last partition, instead of from the partition containing the greatest number of rows.
* InnoDB: When logging the delete-marking of a record during online ALTER TABLE...ADD PRIMARY KEY, InnoDB writes the transaction ID to the log as it was before the deletion or delete-marking of the record. When doing this, InnoDB would overwrite the DB_TRX_ID field in the original table, which could result in locking issues.
* InnoDB: The row_sel_sec_rec_is_for_clust_rec function would incorrectly prepare to compare a NULL column prefix in a secondary index with a non-NULL column in a clustered index.
* InnoDB: An incorrect purge would occur when rolling back an update to a delete-marked record.
* InnoDB: An assertion would be raised in fil_node_open_file due to a missing .ibd file. Instead of asserting, InnoDB should return false and the caller of fil_node_open_file should handle the return message.
* InnoDB: The assertion ut_ad(oldest_lsn <= cur_lsn) in file buf0flu.cc would fail because the current max LSN would be retrieved from the buffer pool before the oldest LSN.
* InnoDB: InnoDB memcached add and set operations would perform more slowly than SQL INSERT operations.
* InnoDB: The InnoDB memcached plugin could be initialized to insert into an InnoDB table with an INTEGER primary key.
More...
* Important Change; Replication: By default, when promoting integers from a smaller type on the master to a larger type on the slave (for example, from a SMALLINT column on the master to a BIGINT column on the slave), the promoted values are treated as though they are signed. Now in such cases it is possible to modify or override this behavior using one or both of ALL_SIGNED, ALL_UNSIGNED in the set of values specified for the slave_type_conversions server system variable. For more information, see Row-based replication: attribute promotion and demotion, as well as the description of the variable.
* Previously, program options could be specified in full or as any unambiguous prefix. For example, the --compress option could be given to mysqldump as --compr, but not as --comp because the latter is ambiguous. Option prefixes now are deprecated. They can cause problems when new options are implemented for programs. A prefix that is currently unambiguous might become ambiguous in the future. If an unambiguous prefix is given, a warning now occurs to provide feedback. For example:
Warning: Using unique option prefix compr instead of compress is
deprecated and will be removed in a future release. Please use the
full name instead.
Option prefixes are no longer supported in MySQL 5.7; only full options are accepted.
* The C API libmysqlclient shared-library .so files now have version 18.1.0 (up from version 18.0.0 used in MySQL 5.5).
* In batch mode, mysql formatted result status messages such as “"Query OK, 1 row affected"” but did not print them. Now these messages are not formatted.
* Bugs Fixed
are replaced with .include "../../devel/readline/buildlink3.mk", and
USE_GNU_READLINE are removed,
* .include "../../devel/readline/buildlink3.mk" without USE_GNU_READLINE
are replaced with .include "../../mk/readline.buildlink3.mk".
* mysql_upgrade now verifies that the server version matches the version against which it was compiled, and exits if there is a mismatch. In addiion, a --version-check option permits specifying whether to enable version checking (the default), or disable checking if given as --skip-version-checking.
* Bugs Fixed
on client. Fixes situations where a binary mysql55-server package picks up
mysql56-client as the best dependency because of the missing upper limit.
Bump PKGREVISION.
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.
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.
mysql_config_editor now supports --port and --socket options for specifying TCP/IP port number and Unix socket file name.
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.
The only supported value for the innodb_mirrored_log_groups system variable is 1, so this variable is now deprecated. Setting it to 1 at startup results in a warning. Setting it to a value other than 1 at startup results in an error and the server exits. This variable will be removed in a future release.
