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Date: Sat, 17 Jan 2015 16:04:27 -0800
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Subject: Re: Help with a fieldcomparator!
From: Erick Erickson <erickerickson@gmail.com>
To: java-user <java-user@lucene.apache.org>
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Ah, OK. H.L. Mencken wrote something like:
"For every complex problem there is a solution
that is simple, elegant, and wrong". I specialize in these...

I don't have a good answer for your question then. How
is what you're trying failing?

Best,
Erick

On Fri, Jan 16, 2015 at 4:59 PM, Victor Podberezski
<vpodberezski@cms-medios.com> wrote:
> Erik, Thanks for your reply.
>
> I wrote a simplification of the problem. Not only the values in the field
> that can be sorted are "val1, val2,..." . they can also be "patternX1,
> patternX2", etc.
>
> and in that case I need to sort according to different criteria. They're =
a
> lot of differents patterns but not to much documents as result of the que=
ry
> filter
> For that reason I think the best way is a custom FieldComparator.
>
> Thanks
> V=C3=ADctor Podberezski
>
> On Fri, Jan 16, 2015 at 9:31 PM, Erick Erickson <erickerickson@gmail.com>
> wrote:
>
>> Personally I would do this on the ingestion side with a new field.
>> That is, analyze the input field when you were indexing the doc,
>> extract the min value from any numbers, and put that in a
>> new field. Then it's simply sorting by the new field. This is likely
>> to be much more performant than reprocessing this at query
>> time in a comparator.
>>
>> FWIW,
>> Erick
>>
>> On Fri, Jan 16, 2015 at 4:00 PM, Victor Podberezski
>> <vpodberezski@cms-medios.com> wrote:
>> > I need a hand with a custom comparator.
>> >
>> > I have a field filled with words separated by spaces. Some words has
>> > numbers inside.
>> >
>> >  I need to extract those numbers and sort the documents by this number=
. I
>> > need to get the lower if there are more than 1 number .
>> >
>> > For example:
>> >
>> > doc1 "val2 aaaa val3" --> 2, 3 --> 2
>> > doc2 "val5 aaaa val1" --> 5, 1 --> 1
>> > doc3 "val7 bbbbb val5" --> 7, 5 ---> 5
>> >
>> > the sorted results have to be:
>> >
>> > doc2
>> > doc1
>> > doc3
>> >
>> > how can I achieve this?
>> >
>> > I have trouble migrating a functional solution from lucene 2.4 to luce=
ne
>> > 3.9 or higher (migration from ScoreDocComparator to fieldComparator).
>> >
>> > I try this:
>> >
>> >     public void setNextReader(IndexReader reader, int docBase) throws
>> > IOException {
>> >
>> >       currentReaderValues =3D FieldCache.DEFAULT.getInts(reader, field=
, new
>> > FieldCache.IntParser() {
>> >       public final int parseInt(final String val) {
>> >      return extractNumber(val);
>> >       }
>> > });
>> >
>> > and the rest equal to the IntComparator.
>> > but this is not working
>> >
>> > Anybody has an idea of how resolve this problem?
>> > Thanks,
>> >
>> > V=C3=ADctor Podberezski
>>
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