Github user mengxr commented on the pull request:
https://github.com/apache/spark/pull/1778#issuecomment-51301688
@rezazadeh Do you mind creating a JIRA for this and then add `[SPARK-####]`
to the title? We also want to learn more about the theory, especially the
relation between storage/computation complexity and failure rate.
Btw, to me, finding similar rows (observations) is more natural than
finding similar columns.
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