Github user marmbrus commented on the pull request:
https://github.com/apache/spark/pull/11854#issuecomment-200600611
I agree with @sameeragarwal that this probably doesn't belong in
constraints since its a cross row concern. However, as he says, it would be
nice to come up with general mechanism to reason about uniqueness and other
cross row constraints as a function of a given `QueryPlan`. For example #9089
also proposes such an API.
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