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https://issues.apache.org/jira/browse/LUCENE-9444?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17172213#comment-17172213
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Michael McCandless commented on LUCENE-9444:
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{quote}Should this class extends {{DocIdSetIterator}} to allow intersection
with another {{DocIdSetIterator}} created from
{{FacetsCollector.MatchingDoc.bits}} ?
{quote}
I think so?
{quote}Making {{dim}} part of ctor feels a bit restrictive, how about providing
2 separate APIs, one that accepts dimension and another that does not ?
{quote}
Maybe the method that produces the iterator could optionally take a {{dim}} to
filter for only those labels under that dimension?
{quote}how about returning a {{java.util.Iterator<FacetLabel>}} instead of
{{FacetLabel[]}} ?
{quote}
+1
> Need an API to easily fetch facet labels for a field in a document
> ------------------------------------------------------------------
>
> Key: LUCENE-9444
> URL: https://issues.apache.org/jira/browse/LUCENE-9444
> Project: Lucene - Core
> Issue Type: Improvement
> Components: modules/facet
> Affects Versions: 8.6
> Reporter: Ankur
> Priority: Major
>
> A facet field may be included in the list of fields whose values are to be
> returned for each hit.
> In order to get the facet labels for each hit we need to
> # Create an instance of _DocValuesOrdinalsReader_ and invoke
> _getReader(LeafReaderContext context)_ method to obtain an instance of
> _OrdinalsSegmentReader()_
> # _OrdinalsSegmentReader.get(int docID, IntsRef ordinals)_ method is then
> used to fetch and decode the binary payload in the document's BinaryDocValues
> field. This provides the ordinals that refer to facet labels in the
> taxonomy.**
> # Lastly TaxonomyReader.getPath(ord) is used to fetch the labels to be
> returned.
>
> Ideally there should be a simple API - *String[] getLabels(docId)* that hides
> all the above details and gives us the string labels. This can be part of
> *TaxonomyFacets* but that's just one idea.
> I am opening this issue to get community feedback and suggestions.
>
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