Will it be possible to combine results from multiple databases in a single query?
Hive and Spark for example support something like this:
SELECT sales.id, sales.amount, hr.id, hr.person FROM sales_db.sales AS sales INNER JOIN hr_db.employees as hr ON hr.id = sales.id
<databasename>.<table> syntax is used to combine databases.
Not sure how this would look in Cypher though