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DRILL-4566: TDigest, median, and quantile functions #456

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DRILL-4566: TDigest, median, and quantile functions #456

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Commits on Mar 30, 2016

  1. DRILL-4566: TDigest, median, and quantile functions 

    Adds tdigest, tdigest_merge, median, and quantile UDFS
Adds reduce aggregates rule to reduce:
  median(x) -> tdigest_median(tdigest(x))
  quantile(q, x) -> tdigest_quantile(q, tdigest(x))
Adds two-phase aggregate rule for tdigest
    @StevenMPhillips
    StevenMPhillips committed Mar 30, 2016
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