Github user sameeragarwal commented on the pull request:
https://github.com/apache/spark/pull/11854#issuecomment-200600284
Sorry for the confusion -- these attribute constraints should still be on a
per-operator basis (i.e., part of the `QueryPlan`). What I meant was that they
can track attribute-specific properties (instead of just row-specific
properties) such as distinctness of a set of attributes.
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