final QueryGranularity gran = query.getGranularity();
final long timeStart = query.getIntervals().get(0).getStartMillis();
// use gran.iterable instead of gran.truncate so that
// AllGranularity returns timeStart instead of Long.MIN_VALUE
final long granTimeStart = gran.iterable(timeStart, timeStart + 1).iterator().next();
final List<AggregatorFactory> aggs = Lists.transform(
query.getAggregatorSpecs(),
new Function<AggregatorFactory, AggregatorFactory>()
{