MySQL 5.7.7 was recently released (it is the latest MySQL 5.7, and is the first “RC” or “Release Candidate” release of 5.7), and is available for download here and here.
As for the fixes/changes, there are quite a few again, which is expected in an early RC release.
The main highlights for me were (though the enhancements, and potentially impactful changes, are definitely not limited to this list):
- Optimizer Note: It is now possible to provide hints to the optimizer within individual SQL statements, which enables finer control over statement execution plans than can be achieved using the optimizer_switch system variable. Optimizer hints are specified as /*+ … */ comments following the SELECT, INSERT, REPLACE, …