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Changes in MySQL 5.6.46
Configuration Notes
It is now possible to compile MySQL 5.6 using OpenSSL 1.1.1, enabling compilation support for MySQL 5.6 against OpenSSL even when OpenSSL 1.0.2 reaches End of Life status at the end of 2019.
In addition, MySQL 5.6 now supports TLSv1.1 and TLSv1.2 protocols for encrypted connections. This applies to MySQL Server, MySQL clients such as mysql and mysqldump, and master/slave replication. Previously, MySQL 5.6 supported only TLSv1, so TLSv1.1/TLSv1.2 support enables use of more secure TLS protocols. It also enables connecting from MySQL 5.6 clients and replication slaves to MySQL 5.7 and higher servers that have TLSv1 disabled, which previously was not possible. It also means that MySQL 5.7 and higher clients that do not want to use TLSv1 can connect to MySQL 5.6 servers.
All MySQL 5.6 builds now use OpenSSL. MySQL no longer supports using yaSSL as the SSL library, and source distributions no longer include yaSSL.
The WITH_SSL CMake option no longer permits bundled (use yaSSL) as a valid value, and the default option value has changed from bundled to system (use the version of OpenSSL installed on the host system).
Bugs Fixed
Improper locking during storage engine initialization could cause a server exit.
A query with a WHERE clause whose predicate contained a numeric value in scientific notation was not handled correctly.
VS2019 produced compilation errors with debug compilation selected due to use of the /ZI flag. Now /Z7 is used instead.
Password masking was incomplete for SHOW PROCESSLIST and some INFORMATION_SCHEMA and Performance Schema tables.
The -DWITH_EXAMPLE_STORAGE_ENGINE=1 CMake option was ignored but should not have been. If -DWITH_EXAMPLE_STORAGE_ENGINE=0 is given, the EXAMPLE storage engine is built as a plugin.
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* 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
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* 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
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* On FreeBSD, create libmysqlclient{,_r}.so.18.0.0 for supress PLIST divergence.
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