org.apache.drill.exec.udfs

Class StringDistanceFunctions.HammingDistanceFunction

java.lang.Object

org.apache.drill.exec.udfs.StringDistanceFunctions.HammingDistanceFunction

All Implemented Interfaces:

DrillFunc, DrillSimpleFunc

Enclosing class:

StringDistanceFunctions

public static class StringDistanceFunctions.HammingDistanceFunction
extends Object
implements DrillSimpleFunc

The hamming distance between two strings of equal length is the number of positions at which the corresponding symbols are different.

For further explanation about the Hamming Distance, take a look at its Wikipedia page at http://en.wikipedia.org/wiki/Hamming_distance.

Usage: SELECT hamming_distance( string1, string2 ) FROM...

Constructor Summary

Constructors

Constructor and Description
HammingDistanceFunction()

Method Summary

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

Methods inherited from class java.lang.Object

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

Constructor Detail

HammingDistanceFunction

public HammingDistanceFunction()

Method Detail

setup

public void setup()

Specified by:

setup in interface DrillSimpleFunc

eval

public void eval()

Specified by:

eval in interface DrillSimpleFunc