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Date: Mon, 19 Apr 2010 18:18:02 +0200
Subject: Re: Combining PrefixQuery and FuzzyQuery
From: Lukas =?ISO-8859-1?B?1nN0ZXJyZWljaGVy?=
	<lukas.oesterreicher@austria.real.com>
To: <java-user@lucene.apache.org>
Message-ID: <C7F24EDA.2D96%lukas.oesterreicher@austria.real.com>
Thread-Topic: Combining PrefixQuery and FuzzyQuery
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Update to my last response with a sample of what I thought you might mean:

This does not work.
Original query up till now:
+(item.name:the* item.name:the)

New query would look like this (which states
Match item.name where a term exists that is either
Exactly the or starts with the):
+(item.name:the*~0.79 item.name:the~0.79)

Until now these matched (I apply ignoring of cases as mentioned):
On The Run
The Final Cut
Us And Them

With the change "Us And Them" will not match anymore.

What I want is a change so it would even match
"Us and Th=E9m"

Lukas

Am 19.04.10 17:13 schrieb "Uwe Schindler" unter <uwe@thetaphi.de>:

> Dont use PrefixQuery, only FuzzyQuery. There you pass in the whole term (=
with
> prefix) and define how many characters are the prefix.
>=20
> -----
> Uwe Schindler
> H.-H.-Meier-Allee 63, D-28213 Bremen
> http://www.thetaphi.de
> eMail: uwe@thetaphi.de
>=20
>=20
>> -----Original Message-----
>> From: Lukas =D6sterreicher [mailto:lukas.oesterreicher@austria.real.com]
>> Sent: Monday, April 19, 2010 5:00 PM
>> To: java-user@lucene.apache.org
>> Subject: Re: Combining PrefixQuery and FuzzyQuery
>>=20
>> Well, how would this look like in code?
>> Currently I have the prefix query like this:
>>=20
>> BooleanQuery bQuery =3D new BooleanQuery();
>> PrefixQuery prefixQuery =3D new PrefixQuery(new Term("item.name",
>> termText));
>> bQuery.add( prefixQuery, Occur.MUST);
>>=20
>> I dont see any class named PrefixTerm.
>> I'd appreciate it if you could show me how it is done in java code.
>>=20
>> Lukas
>>=20
>> Am 19.04.10 16:48 schrieb "Uwe Schindler" unter <uwe@thetaphi.de>:
>>=20
>>> How about a fuzzy query with a prefix term? Its configureable.
>>>=20
>>> -----
>>> Uwe Schindler
>>> H.-H.-Meier-Allee 63, D-28213 Bremen
>>> http://www.thetaphi.de
>>> eMail: uwe@thetaphi.de
>>>=20
>>>=20
>>>> -----Original Message-----
>>>> From: Lukas =D6sterreicher
>> [mailto:lukas.oesterreicher@austria.real.com]
>>>> Sent: Monday, April 19, 2010 4:43 PM
>>>> To: java-user@lucene.apache.org
>>>> Subject: Combining PrefixQuery and FuzzyQuery
>>>>=20
>>>> Hello.
>>>>=20
>>>> Is it possible to combine PrefixQuery and FuzzyQuery?
>>>> The search on a term should both be fuzzy but also match with
>> results
>>>> that
>>>> jut begin with that token (or an approximation of that token).
>>>>=20
>>>> If it is possible, can you give me an example on how to achieve
>> this?
>>>>=20
>>>> Currently I only use the PrefixQuery and performance is ok.
>>>> Would performance with such a combination be much worse?
>>>>=20
>>>> I would not even need a complete fuzzy search, it would suffice
>>>> To have the matching be done without caring for cases (this I
>> already
>>>> have
>>>> present by using a modified WhitespaceTokenizer which filters
>>>> To lower cases) and with also matching characters where accents
>>>> Also match, so e would match =E9 and =E8.
>>>>=20
>>>> Finally, I would like to know how much sorting a string field
>>>> Which is not too long (containing track or album title) affects
>>>> performance
>>>> Copared to not providing any sorting parameters.
>>>>=20
>>>> Thanx in advance,
>>>> Lukas
>>>=20
>>>=20
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>>>=20
>>=20
>>=20
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>=20
>=20
>=20
> ---------------------------------------------------------------------
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>=20


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