Github user gatorsmile commented on the pull request:
https://github.com/apache/spark/pull/11854#issuecomment-200617980
I see. In the https://github.com/apache/spark/pull/9089, the key can only
contain a single attribute.
Will try to define a function in QueryPlan for uniqueness ASAP. Network
outage now. Hopefully service will be back soon. Thanks!
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