name ArgMax= column?

[tkawachi]

In the following example, I have retrieved title with the latest change_date for each id from History.

History(id: "A", change_date: Date(2021, 4, 1), title: "A-title2");
History(id: "A", change_date: Date(2021, 3, 1), title: "A-title1");
History(id: "B", change_date: Date(2021, 3, 1), title: "B-title1");

Latest(id:) ArgMax= title -> x :- History(id:, title:, change_date: x);

+----+--------------+
| id | logica_value |
+----+--------------+
| A  | A-title2     |
| B  | B-title1     |
+----+--------------+

Here, title is assigned a column named logica_value, but I want to rename it to title. How can I do this?
(In fact, I don't know how Latest(id:) ArgMax= title -> x :- History(id:, title:, change_date: x); is interpreted grammatically.)

[EvgSkv]

The value is simply interpreted as a column named logica_value.
To put the result of ArgMax to the title column we can do as follows.

History(id: "A", change_date: Date(2021, 4, 1), title: "A-title2");
History(id: "A", change_date: Date(2021, 3, 1), title: "A-title1");
History(id: "B", change_date: Date(2021, 3, 1), title: "B-title1");

Latest(id:, title? ArgMax= title -> x) distinct :- History(id:, title:, change_date: x);

The arrow notation a -> b is simply a nice way to write {arg: a, value: b} and the ArgMax aggregation function takes such record as an argument, returning arg which has the largest value.

Please let me know if you have further questions.

[tkawachi]

Thank you very much. I'm starting to enjoy logica more and more.