how to express array_agg(x order by t)?

[Jiamo]

In such query

GroupEvents1(user_pseudo_id, events? List= custom_event_name) distinct :-
    Events(user_pseudo_id:, custom_event_name:, event_timestamp:);

I want to get events with order by event_timestamp still find no answer in document?

It will be the same situation in Functional aggregation:

GroupEvents2(user_pseudo_id) List=  custom_event_name  :-
    Events(user_pseudo_id:, custom_event_name:, event_timestamp:);

[Evgeny Skvortsov]

This is done with Array aggregate operator. I've updated tutorial to mention it.

In your Functional example it would be like so:

GroupEvents2(user_pseudo_id) Array= event_timestamp -> custom_event_name :-
    Events(user_pseudo_id:, custom_event_name:, event_timestamp:);

Let me know if you have further questions.

[Jiamo]

Thanks.