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 query
filter
For that reason I think the best way is a custom FieldComparator.
Thanks
Víctor Podberezski
On Fri, Jan 16, 2015 at 9:31 PM, Erick Erickson <erickerick...@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
> <vpodberez...@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 lucene
> > 3.9 or higher (migration from ScoreDocComparator to fieldComparator).
> >
> > I try this:
> >
> > public void setNextReader(IndexReader reader, int docBase) throws
> > IOException {
> >
> > currentReaderValues = 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,
> >
> > Víctor Podberezski
>
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