slow query

[ryang-sfdc]

SELECT max(val) FROM mytable WHERE date >= TO_DATE(?) AND date <= TO_DATE(?) AND host LIKE 'baz-%' AND host NOT LIKE '%foobar%' GROUP BY ROUND(date,'minute',?)

Row key is composed of a non-nullable host followed by a date.

[jtaylor-sfdc]

This query will perform better once we gather and use stats to guide parallelization (#49). I'm going to mark it as a dup of that one, but we can reopen if performance is still sub optimal after that.