Github user srowen commented on the issue:
https://github.com/apache/spark/pull/19406
It's probably OK, though kind of special cases the first quantile. This
expression doesn't incorporate relativeError. I'm actually not sure why it
needs to account for relativeError here; it's an extra level of approximation.
But the asymmetry seems a bit wrong.
It is after all approximate? the loop below actually accounts for the same
case, but incorporates relativeError.
When in doubt ask the author: @clockfly
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