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Adds an aggregate function to compute equi-depth histograms. The UDA creates a sample of the column values using weighted reservoir sampling and computes the histogram from the sorted sample. TODO: * Extract highly frequent values into separate buckets (i.e. 'compressed histogram'). * Expose separate finalize fn to produce samples and histogram data for stats Change-Id: I314ce5fb8c73b935c4d61ea5bbd6816c59b3b41e Reviewed-on: http://gerrit.ent.cloudera.com:8080/3552 Reviewed-by: Matthew Jacobs <mj@cloudera.com> Tested-by: jenkins (cherry picked from commit c5c475712f88244e15160befaf4e99d6e165a148) Reviewed-on: http://gerrit.ent.cloudera.com:8080/3608
This directory contains Impala test workloads. The directory layout for the workloads should follow: workloads/ <data set name>/<data set name>_dimensions.csv <- The test dimension file <data set name>/<data set name>_core.csv <- A test vector file <data set name>/<data set name>_pairwise.csv <data set name>/<data set name>_exhaustive.csv <data set name>/queries/<query test>.test <- The queries for this workload