-- 5 rows qualify; Plan is: (SeqScan rasters)
-- why doesn't it use the index on rtime?
create table foo_1 as select  1 as rtime, 64 as resolution, 5 as frequency, 
       LowerRes(Clip(data, '(-1704753, -581511, -1604753, -481829)'::Box), 64) 
       as data from rasters where rtime = 1 and frequency = 5;
