Github user felixcheung commented on the issue:
    That's a great point. Currently R is the same as Python in that when 
`joinExpr` is `NULL` (R) or `on` is `None` (Python), CrossJoin is assumed. 
    Problem is by default `joinExpr = NULL` (R) and `on = None` (Python) - one 
approach is to change both defaults, so that when omitted, they don't default 
to CrossJoin.
    Another approach is to additional ask for `joinType` or `how` of a new 
`cross_join` - but this could be a bigger change.

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