cumulate 不能和比较函数连用

[李航飞]

sql语句如下：
select count(clicknum) as num 

from table(

cumulate(table testTable, desctiptor(crtTime),interval '1'minutes, interval 
'10' minutes))

where clicknum <>'-99'

group by window_start,window_end


报错 信息：
Flink doesn't support individual window table-valued function 
cumulate(time_col=[app_date],max_size=[10 min],step=[1 min]...


请问如何解决，谢谢