聚合计算
A
1 [1,3,7,null,2,3]
2
=A1.len()
3
=A1.count()
4
=A1.sum()
5
=A1.avg()
6
=A1.max()
7
=A1.min()
8
=A1.rank()

A2~A8中运算结果如下: