[SOLR-10724] Add describe Stream Evaluator

• Type: New Feature
• Status: Resolved
• Priority: Major
• Resolution: Resolved
• Fix Version/s: 6.7, 7.0
• Assignee: Joel Bernstein
• Reporter: Joel Bernstein
• Created: 22/May/17 18:26
• Updated: 08/Oct/19 14:50
• Resolved: 06/Jun/17 00:14

Description

The describe Stream Evaluator provides descriptive statistics for an array of numbers. describe returns a single tuple with the following stats:

geometricMean, kurtosis, max, min, mean, N, populationVariance, quadraticMean, skewness, standardDeviation, sum, sumsq, variance

Syntax:

c = describe(colA)

Implementation provided by Apache Commons Math

Issue Links

• is related to: SOLR-10651 Streaming Expressions statistical functions library