Merged cset:
Copy of
commit d1bb19b8f751875472211312c8e810143a7ba4b6
Author: Manuel Ung <mung@fb.com>
Date: Fri Feb 3 11:50:34 2017 -0800
...
Add cardinality stats to information schema
(why are table reads/writes/updates collected in ha_statistics?
this structure was intended for table statistics that the engine
reports.. and now it is also used for engine-agnostic statistics
like rows_read, rows_requested, etc?)
