Hey John,

I looked through the source code and didn't find support for a
PERCENTILE (or similar) aggregation function, but it appears that it
conceptually wouldn't be too hard to build one as a generalize form
the existing MEDIAN aggregation. To validate my thinking with you, I
imagine that PERCENTILE would take one additional argument indicating
what percentile to return. Unless I'm mistaken, it seems that MEDIAN
could then be implemented as PERCENTILE(50, <columns>) internally.

What are your thoughts on this feature?

Michael
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