NHibernate 對分組聚合支援的不好

hibernate 對分組聚合支援的不好，例如下面的**：

var query = from raqi in session.query()

group raqi by raqi.spacekey
into g
select new ;

select

factstatra0_.[spacekey] as col_0_0_,
cast(count(*) as int) as col_1_0_ 
from
[dbo].[factstatraqi] factstatra0_ 
group by
factstatra0_.[spacekey]

-- region parameters

declare @p0 float set @p0 = 1
-- endregion
select [t1].[spacekey] as [key], (
select count(*)
from [factstatraqi] as [t2]
where ([t2].[raqi] > @p0) and ([t1].[spacekey] = [t2].[spacekey])
) as [count]
from (
select [t0].[spacekey]
from [factstatraqi] as [t0]
group by [t0].[spacekey]
) as [t1]

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