Mailing-List: contact java-user-help@lucene.apache.org; run by ezmlm
Precedence: bulk
Reply-To: java-user@lucene.apache.org
Received-SPF: pass (nike.apache.org: domain of jason.rutherglen@gmail.com
 designates 209.85.216.48 as permitted sender)
DomainKey-Signature: a=rsa-sha1; c=nofws;
        d=gmail.com; s=gamma;
        h=mime-version:in-reply-to:references:date:message-id:subject:from:to
         :cc:content-type:content-transfer-encoding;
        b=izSMx/FZgzU4K0V9tB15jiBJ4rhNEjkHSIM7jrcIFjMvKKj8qFKcGYG1YUJfq/muCs
         O/knYA8VsZDkS6ZE4xP0SrgdxbnPwyq2vsWjtkXBb9oQ8KgM88hN0/+FTTg/Jz43LgZi
         VCwz26OSUzU1X2UqgfmAagy2unkcGoT2BzVh0=
MIME-Version: 1.0
In-Reply-To: <AANLkTi=Wq=6eLoyRdcOkRpSZiS+nucYeiAcTqLQ5Kzn6@mail.gmail.com>
References: <AANLkTimpKMD1dojwMB=kdJmWTuCY4BBDRUkYuZb_FgRw@mail.gmail.com>
	<AANLkTi=Wq=6eLoyRdcOkRpSZiS+nucYeiAcTqLQ5Kzn6@mail.gmail.com>
Date: Sat, 19 Feb 2011 05:42:29 -0800
Message-ID: <AANLkTimLWwzCW+xbk5AL1GdcYcAU0LtBEXk5=Ri_4sYh@mail.gmail.com>
Subject: Re: Last/max term in Lucene 4.x
From: Jason Rutherglen <jason.rutherglen@gmail.com>
To: Michael McCandless <lucene@mikemccandless.com>
Cc: java-user@lucene.apache.org
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

> Instead of docFreq, did you mean numUniqueTerms?

Right.

> But you have to
> use a terms index impl that supports ord (eg FixedGap).

Ok, and the VariableGap is the new standard because the FST is much
more efficient as a terms index?  Perhaps I'd need to create a codec
(or patch the existing) to automatically store the max term?

On Sat, Feb 19, 2011 at 3:33 AM, Michael McCandless
<lucene@mikemccandless.com> wrote:
> I don't quite understand your question Jason...
>
> Seeking to the first term of the field just gets you the smallest term
> (in unsigned byte[] order, ie Unicode order if the byte[] is UTF8)
> across all docs.
>
> Instead of docFreq, did you mean numUniqueTerms? =A0Ie, you want to seek
> to the largest term for that field? =A0In which case, yes seeking by
> term ord to numUniqueTerms-1 gets you to that term. =A0But you have to
> use a terms index impl that supports ord (eg FixedGap).
>
> Mike
>
> On Fri, Feb 18, 2011 at 9:24 PM, Jason Rutherglen
> <jason.rutherglen@gmail.com> wrote:
>> This could be a rhetorical question. =A0The way to find the last/max
>> term that is a unique per document is to use TermsEnum to seek to the
>> first term of a field, then call seek to the docFreq-1 for the last
>> ord, then get the term, or is there a better/faster way?
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: java-user-unsubscribe@lucene.apache.org
>> For additional commands, e-mail: java-user-help@lucene.apache.org
>>
>>
>
>
>
> --
> Mike
>
> http://blog.mikemccandless.com
>

---------------------------------------------------------------------
To unsubscribe, e-mail: java-user-unsubscribe@lucene.apache.org
For additional commands, e-mail: java-user-help@lucene.apache.org