Github user gatorsmile commented on the pull request:
https://github.com/apache/spark/pull/11854#issuecomment-200466548
So far, nope. Actually, the idea of this PR comes out when I fixing a JIRA
related to TPC-DS Q38.
Generally, `IsDistinct` can also benefit the physical execution of queries.
This could have a broader impact. In RDBMS, unique constraints are very
important in query optimization. I believe it is also applicable to Spark SQL,
although we do not have constraint enforcement or unique constraints in Spark
SQL
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