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https://issues.apache.org/jira/browse/LUCENE-9444?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17189618#comment-17189618
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Ankur edited comment on LUCENE-9444 at 9/2/20, 6:35 PM:
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Here is a patch that adds a new utility class {{TaxonomyFacetLabels}}
with a single method {{getFacetLabelReader(LeafReaderContext)}} that returns
an instance of nested class {{FacetLabelReader}}.
It uses an instance of {{OrdinalsSegmentReader}} to fetch and decode ordinals
for input docid into a reusable buffer and returns an {{Iterator}} that uses
{{TaxonomyReader}} to lookup and return {{FacetLabels}} for each ordinal.
The patch also adds a new test case {{TestTaxonomyLabels}} demonstrating the
usage.
was (Author: goankur):
Here is a patch that adds a new utility class {{TaxonomyFacetLabels}}
with a single method {{getFacetLabelReader(LeafReaderContext)}} that returns an
instance of nested class {{FacetLabelReader}}.
It uses an instance of {{OrdinalsSegmentReader}} to fetch and decode ordinals
for input docid into a reusable buffer and returns an {{Iterator}} that uses
{{TaxonomyReader}} to lookup and return {{FacetLabels}} for each ordinal.
The patch also adds a new test case {{TestTaxonomyLabels}} demonstrating the
usage.
> 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
> Labels: facet
> Attachments: LUCENE-9444.patch
>
>
> 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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