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https://issues.apache.org/jira/browse/LUCENE-5326?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13812721#comment-13812721
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Shai Erera commented on LUCENE-5326:
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Why does the app need to explicitly add the facets as "enum"? I mean, if you
use FacetFields, it already adds the drilldown terms (effectively as
StringField), and I thought the 'enum' method (like EnumFacetsAccumulator) will
use the drilldown terms instead of the category list? At least, I don't see
FF.addEnumFields doing something special when it adds the fields...
I also think that it's wrong that the facets aren't added to the taxonomy. E.g.
if you start w/ a dimension that's small and you choose to optimize faceted
search with 'enum', but then the dimension grows, so much that enum stops
performing or costs too much RAM, what will you do - reindex the content?
If it's possible to index facets as usual, only optimize their accumulation, I
think that's best. It will be like aggregating from Lucene45DVF, DirectDVF or
CachedOrds (RAM grows with each, but performance improves) - it's a search-time
decision, not indexing.
I haven't done a deep review of the patch yet, but in EnumFacetsAccumulator's
jdocs you write "you should index normally e.g. StringField..." -- that's
wrong? Currently you have to index using FF.addEnumFields?
> Add enum facet method to Lucene facet module
> --------------------------------------------
>
> Key: LUCENE-5326
> URL: https://issues.apache.org/jira/browse/LUCENE-5326
> Project: Lucene - Core
> Issue Type: Improvement
> Components: modules/facet
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Fix For: 4.6, 5.0
>
> Attachments: LUCENE-5326.patch
>
>
> I've been testing Solr facet performance, and the enum method works
> very well for low cardinality (not many unique values) fields. So I
> think we should fold a similar option into Lucene's facet module.
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