Hibernate(HQL) 怪异的count()函数

[size=medium][b][color=blue]近日发现HQL中， count()函数要求还比较严格，举例说：[/color][/b]
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[b]1、count(1)报错[/b]

<query name="getRecordCountById">
	select count(1) as recordCount from Km c
	where c.id=:id
</query>

[b]2、count(c.*)报错[/b]

<query name="getRecordCountById">
	select count(c.*) as recordCount from Km c
	where c.id=:id
</query>

[b]3、count(*)正确[/b]

<query name="getRecordCountById">
	select count(*) as recordCount from Km c
	where c.id=:id
</query>