Is there any limitation when join big table cross data base?

Select
*
from “SQLServerSource”.dbo.users u
join “MongoSource”.sales.orders o
on o.user_id = u.UserId

When querying data cross database, is there any limitation existent?

The row count of table?
The row size of dataset be returned?
Or something else?

Thanks

@WileyXu

Here are our current limits

https://docs.dremio.com/advanced-administration/limits.html

Very helpful.

Thank you