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https://issues.apache.org/jira/browse/LUCENE-5370?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13915602#comment-13915602
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Rob Audenaerde commented on LUCENE-5370:
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I have implemented sorting on label based on the 4.7 branch. The cost in terms
of speed is not really that high compared to retrieving values.
I have an index with 999.999 random documents. To retrieve a top-ten facet list
based on value takes +- 510 ms. Retrieving labels takes +- 580 ms.
So it looks like there is only increase in time of about 15%.
> 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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