Github user rxin commented on the pull request:
https://github.com/apache/spark/pull/9280#issuecomment-154234680
@hvanhovell I think the approach we want to take is to either use the
aggregate expansion (#9406), or use joins, and not this one. Do you mind
closing this one? (We already have a record of it from JIRA in case we need to
reference it).
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