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https://issues.apache.org/jira/browse/LUCENE-5370?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13943938#comment-13943938
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Shai Erera commented on LUCENE-5370:
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bq. For my purpose, it's sufficient to sort facet after compute the top-n
facets by weigth
You can then sort the LabelAndValues[] by their label part.
{quote}
Btw. I'm currently experimenting with a similar approach where we have
facetlabels that are effectively numbers (like currency). Because I do not know
on beforehand what will be in the facets, I put the String representation in
the FacetLabel and store the numberic value in the Float part of a
FloatAssociatedFacetField. Facets then can be sorted on the FloatAssociated
value, which should be faster than retrieving labels from the reader.
{quote}
Do you have a unique value per document? If so, you should consider indexing
the values in a NumericDocValues field (not go through the taxonomy at all and
FacetsConfig) and then you can use the facet module's range faceting for
example.
> Sorting Facets on CategoryPath (Label)
> --------------------------------------
>
> Key: LUCENE-5370
> URL: https://issues.apache.org/jira/browse/LUCENE-5370
> Project: Lucene - Core
> Issue Type: New Feature
> Components: modules/facet
> Affects Versions: 4.6
> Reporter: Rob Audenaerde
> Labels: features
>
> Facet support sorting through {{FacetRequest.SortOrder}}. This is used in the
> {{ResultSortUtils}}. For my application it would be very nice if the facets
> can also be sorted on their label.
> I think this could be accomplished by altering {{FacetRequest}} with an extra
> enum {{SortType}}, and two extra {{Heap}} in {{ResultSortUtils}} which
> instead of comparing the double value, compare the CategoryPath.
> What do you think of this idea? Or could the same behaviour be accomplished
> in a different way already?
> (btw: I tried building this patch on the trunk of lucene5.0; but I couldn't
> get the maven build to build correctly. I will try again lateron on the 4.6
> branch.
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