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https://issues.apache.org/jira/browse/LUCENE-5370?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13917309#comment-13917309
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Shai Erera commented on LUCENE-5370:
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What does sort by label mean? Do you ignore the counts/weights and just want to
show the top-10 label-sorted facets? Or after you compute the top-10 facets (by
weight), you want to sort their labels?
Note that sorting by label is greatly affected by the size of the taxonomy,
less by the number of documents. Asking the taxonomy to label each ordinal will
be very costly if the taxonomy is huge (e.g. not all labels can be cached in
memory) vs if it's small.
> 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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