Natural Join should act like Cross Join on relations that don't share attributes

[Valdsonjr]

The article for 'join' states that the result of a natural join between two relations R and S that don't have any attributes in common is supposed to be a cross join, but an empty relation is returned instead.

Expected behavior: example in the RelaX - relational algebra calculator

Actual behavior:

[agentm]

Oh, good find! I'll fix this right away.