[jira] [Updated] (LUCENE-5326) Add enum facet method to Lucene facet module

["Michael McCandless (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-5326?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael McCandless updated LUCENE-5326:
---------------------------------------

    Attachment: LUCENE-5326.patch

Initial rough patch, tons of nocommits, but testBasic and testRandom
seem to pass.  This differs somewhat from Solr's approach:

  * It's NRT-friendly (bitsets are recorded per segment, not per top-level reader).

  * It handles hierarchical facets as long as they are single-valued
    (it acts like the NO_PARENTS ord policy).
  
  * Cutover to the facet module APIs: you use FacetFields to index,
    pass List<FacetRequest>, get back List<FacetResult>, etc.

  * All dims are indexed as a single field ($enumfacets currently), so
    it's fine to have many, many dims.

  * It's not a cache: instead, it loads bitsets for all dims in the
    segment the first time it sees that segment.

Also, I modified RamUsageEstimator so you can optionally pass an
ObjectFilter to limit what sizeOf visits.


> 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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