Package org.apache.drill.exec.udfs

Class ThreatHuntingFunctions.NormedStringEntropyFunction

java.lang.Object

org.apache.drill.exec.udfs.ThreatHuntingFunctions.NormedStringEntropyFunction

All Implemented Interfaces:

DrillFunc, DrillSimpleFunc

Enclosing class:

ThreatHuntingFunctions

public static class ThreatHuntingFunctions.NormedStringEntropyFunction
extends Object
implements DrillSimpleFunc

This function calculates the Shannon Entropy of a given string of text, normed for the string length. See: https://en.wikipedia.org/wiki/Entropy_(information_theory) for full definition.

Usage: SELECT entropy_per_byte() AS entropy FROM... Returns a double

Constructor Summary

Constructors

Constructor	Description
NormedStringEntropyFunction()

Method Summary

Modifier and Type	Method	Description
void	eval()
void	setup()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

NormedStringEntropyFunction

public NormedStringEntropyFunction()

Method Details

setup

public void setup()

Specified by:

setup in interface DrillSimpleFunc

eval

public void eval()

Specified by:

eval in interface DrillSimpleFunc