Question Can/should you query Entities by index range?

I know you should avoid cache misses. E.g. accessing random entities en masse is bad.
I know you're supposed to query entities by using "Tags".
I also know "The entity and component arrays returned by a EntityQuery are guaranteed to be "parallel", that is, the same index value always applies to the same entity in any array."

But here's a common scenario:

- I have a game with 100,000 entities (let's say they're bullets)
- They're all pooled (ie created in the beginning of the game, in sequence)
- I know every 10,000 entities belongs to one player.
How do I tell Player 7's system, to loop through their 10,000 entities?

I would want to say "EntityManager, please fetch me entities typeof(BulletTag), between index 60,000 and 70,000". Do I just fetch -all- BulletTag and for-loop starting at i=60,000? Is that right/efficient?

Or am I wrong in wanting to iterate through sections of fixed entity pools? Many games were/are built like this afaik.

 

Aaah, so "ISharedComponent" triggers some sort of internal database sorting / id'ing. I thought it just slowly goes through all entities and checks the value...
Great! Thanks.