VIEW: COUNT and other aggregate functions do not work inside a view

To reproduce:

Create the necessary table to read from:

CREATE TABLE user_group_members (
group_id uint32,
user_id uint32,
PRIMARY KEY (group_id, user_id)
);

Create a view:

CREATE VIEW user_group_view WITH (security_invoker = TRUE) AS
SELECT COUNT(user_id) AS members_count
FROM `/Root/user_group_members`; -- write your own path to the `user_group_members` table

Select from the view:
```
SELECT * FROM user_group_view;
```

Observe an error:

Status: GENERIC_ERROR
Issues: 
<main>: Error: Type annotation, code: 1030
<main>:1:1: Error: At function: RemovePrefixMembers, At function: RemoveSystemMembers, At function: PersistableRepr, At function: SqlProject, At function: PersistableRepr, At function: SqlProject
    <main>:1:48: Error: At function: AssumeColumnOrderPartial
        <main>:1:8: Error: At function: Aggregate, At function: Apply
            <main>:1:8: Error: Expected callable type, but got: Unit

ydb-platform / ydb

VIEW: COUNT and other aggregate functions do not work inside a view #6394