In crash recovery InnoDB now prints the progress in percents of a
transaction rollback.
Fixed a bug/feature: if your application program used
mysql_use_result(), and used >= 2 connections to send
SQL queries, it could deadlock on the adaptive hash S-latch
in btr0sea.c. Now mysqld releases the S-latch whenever it
passes data from a SELECT to the client.
Fixed a bug: MySQL could erroneously return 'Empty set'
if InnoDB estimated an index range size to 0 records though
the range was not empty; MySQL also failed to do the next-key
locking in the case of an empty index range.