org.apache.drill.exec.expr.fn.impl

Class StringDistanceFunctions.JaroDistanceFunction

java.lang.Object

org.apache.drill.exec.expr.fn.impl.StringDistanceFunctions.JaroDistanceFunction

All Implemented Interfaces:

DrillFunc, DrillSimpleFunc

Enclosing class:

StringDistanceFunctions

public static class StringDistanceFunctions.JaroDistanceFunction
extends Object
implements DrillSimpleFunc

A similarity algorithm indicating the percentage of matched characters between two character sequences.

The Jaro measure is the weighted sum of percentage of matched characters from each file and transposed characters. Winkler increased this measure for matching initial characters.

This implementation is based on the Jaro Winkler similarity algorithm from https://en.wikipedia.org/wiki/Jaro–Winkler_distance

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

Constructor Summary

Constructors

Constructor and Description
JaroDistanceFunction()

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

JaroDistanceFunction

public JaroDistanceFunction()

Method Detail

setup

public void setup()

Specified by:

setup in interface DrillSimpleFunc

eval

public void eval()

Specified by:

eval in interface DrillSimpleFunc