Github user mateiz commented on the pull request:
https://github.com/apache/spark/pull/193#issuecomment-38337945
Alright, I'll push a commit to update the doc.
I agree this is not good for performance -- just make sure you don't add
much longer SQL keywords, because the cost is exponential. Most definitely
don't add
[SEMANTICSIMILARITYDETAILSTABLE](http://technet.microsoft.com/en-us/library/ms189822.aspx).
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