Steven Phillips

DRILL-4566: TDigest, median, and quantile functions

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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 Also adds ability...

Here are the pojos that represent the data for the new system tables: ``` java public static class FragmentInfo { public String hostname; public String queryId; public int majorFragmentId; public...

…on properly When getCost(rel) is called, a node's nonCumulativeCost() is computed. When using CachingRelMetadataProvider is used, metadata is cached (rowCount, cost, etc.) for future use. In order to make sure...

[CALCITE-2751] Catch MetadataCycleException in VolcanoRelMetadataProvider

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Change-Id: I52e910c714d4061e78e2e48b1ce5890469b391b4