A whole bunch of stuff got merged to the embedded_innodb engine recently. The end game is to have the embedded_innodb engine be just linking to HailDB (where we’re continuing maintenance of Embedded InnoDB).

So, what made it in? A lot of bug fixes (especially around error reporting and tables without an explicit primary key), SELECT FOR UPDATE, support for temporary tables and support of prefix indexes.

We also now, if it’s available, link to HailDB instead of Embedded InnoDB. At some point “soon” we shall just require HailDB.