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https://issues.apache.org/jira/browse/LUCENE-4700?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13559051#comment-13559051
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Shai Erera commented on LUCENE-4700:
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Following the recent facets work, I think that as part of this issue we should
do the following two things (in addition to what I described above):
* Make OrdinalPolicy an enum with two constants (ALL/NO_PARENTS). It's already
hard to support just these two (see LUCENE-4610 and LUCENE-4600), and it's not
at all clear how to support arbitrary OrdinalPoilcy-ies that users will provide.
** Rather, if one really wishes to encode only say levels 3 and below, he can
extend FacetFields and provide his own CategoryListBuilder.
** For the search side, he'll need to provide whatever will work for him (I
cannot even describe here what API exactly because of the complexity)
* Nuke PathPolicy. One can extend FacetFields and provide his own
DrillDownStream. I'll need to check about that one, but it looks like we can
get rid of it too.
> OrdinalPolicy and PathPolicy should be per-CategoryListParams
> -------------------------------------------------------------
>
> Key: LUCENE-4700
> URL: https://issues.apache.org/jira/browse/LUCENE-4700
> Project: Lucene - Core
> Issue Type: Improvement
> Components: modules/facet
> Reporter: Shai Erera
> Assignee: Shai Erera
>
> Today these two are per FacetIndexingParams, which means that once defined,
> they affect all category lists. This prevents for example to index one
> category list with OrdinalPolicy.NO_PARENTS and another with
> OrdinalPolicy.ALL_PARENTS. Especially now that we know NO_PARENTS is faster
> (see LUCENE-4600), it will be good if users can control this setting per
> CategoryListParams, and index only the few facets which a document has more
> than once (e.g. Author) in a separate category list.
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