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Subject: RE: Testing for field existence
Date: Mon, 18 Aug 2008 12:58:37 -0400
Message-ID: 
 <87D5FFD601E4BC488D51E45D414706C7037AFE59@VOO-EXCHANGE01.internal.sungard.corp>
In-Reply-To: <19034359.post@talk.nabble.com>
Thread-Topic: Testing for field existence
Thread-Index: AckBSYtGtk4kywDOSF23XI3KV8GVwAACdT4g
From: <Bill.Chesky@sungard.com>
To: <java-user@lucene.apache.org>


Karsten,

Thanks for the feedback.  Not sure I understand the reasoning behind not
using the "XXXX" prefix (do you have a link possibly?).  But I see what
you are getting at with the additional field.  I'll give it a try.
Thanks for the help.

regards,

Bill


-----Original Message-----
From: Karsten F. [mailto:karsten-lucene@fiz-technik.de]=20
Sent: Monday, August 18, 2008 11:45 AM
To: java-user@lucene.apache.org
Subject: Re: Testing for field existence


Hi Bill,

you should not use prefix-query (XXXX*), because in first step lucene
would
generate a list of all terms in this field, and than search for all this
terms. Which is senceless.

I would suggest to insert a new field "myFields" which contains as value
the
names of all fields for this document.
So instead of
            +foo:XXXX*
you would search for
            +myFields:foo

This would be very fast.

Best regards=20

  Karsten


Bill.Chesky wrote:
>=20
> Hello,
>=20
>  I am creating fields for documents like this:
>=20
> =20
>=20
> String name =3D ...
>=20
> String value =3D ...
>=20
> doc.add(new Field(name, value, Field.Store.NO,
> Field.Index.UN_TOKENIZED));
> ...=20
>=20
> One thing I tried is to change my field creation statement like this:
> =20
>=20
> doc.add(new Field(name, "XXXX" + value, Field.Store.NO,
> Field.Index.UN_TOKENIZED));
>=20
> =20
> then do a query like this:
>=20
>=20
>             +foo:XXXX*
>=20
>=20
>=20
>=20

--=20
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