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Posted to issues@lucene.apache.org by "Michael McCandless (Jira)" <ji...@apache.org> on 2021/01/16 12:31:00 UTC
[jira] [Updated] (LUCENE-9444) Need an API to easily fetch facet
labels for a field in a document
[ https://issues.apache.org/jira/browse/LUCENE-9444?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Michael McCandless updated LUCENE-9444:
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Fix Version/s: 8.7
> 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
> Fix For: master (9.0), 8.7
>
> Attachments: LUCENE-9444.patch, LUCENE-9444.patch, LUCENE-9444.v2.patch
>
> Time Spent: 5h 10m
> Remaining Estimate: 0h
>
> 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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