org.apache.drill.exec.udfs

Class StringDistanceFunctions.LevenstheinDistanceFunction

java.lang.Object

org.apache.drill.exec.udfs.StringDistanceFunctions.LevenstheinDistanceFunction

All Implemented Interfaces:

DrillFunc, DrillSimpleFunc

Enclosing class:

StringDistanceFunctions

public static class StringDistanceFunctions.LevenstheinDistanceFunction
extends Object
implements DrillSimpleFunc

An algorithm for measuring the difference between two character sequences.

This is the number of changes needed to change one sequence into another, where each change is a single character modification (deletion, insertion or substitution).

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

Constructor Summary

Constructors

Constructor and Description
LevenstheinDistanceFunction()

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

LevenstheinDistanceFunction

public LevenstheinDistanceFunction()

Method Detail

setup

public void setup()

Specified by:

setup in interface DrillSimpleFunc

eval

public void eval()

Specified by:

eval in interface DrillSimpleFunc