Hi Jiayi,
GroupPattern is used to support patterns like this: A (B C) {3} D. The
sub-group (B C) is considered as a GroupPattern. Without it, it's impossible to
support patterns like that. You can refer to the GroupITCase for more
information.
Regards,
Dian
> 在 2019年2月15日，下午4:10，bupt_ljy <bupt_...@163.com> 写道：
>
> Hi, all
> I notice that we have GroupPattern, which is subclass of Pattern in
> flink-cep module. I’m not very sure about the meaning of GroupPattern and its
> necessity. I will appreciate if anyone can list some examples for me to help
> understand this?
>
> Thanks!
>
>
> Best Regards,
> Jiayi Liao
