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https://issues.apache.org/jira/browse/LUCENE-4600?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13558838#comment-13558838
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Shai Erera commented on LUCENE-4600:
------------------------------------
Thanks for running this. I think that given these results, making NO_PARENTS
the default policy is not that good. I anyway think it's not a good default,
because it forces the user to stop and think if the documents that he'll index
share or not parents. This looks like an advanced setting to me, i.e. if you
want to get "expert" and really know your content, then you can choose to index
like so. Plus, given those statistics, I'd say that you have to test before you
go to production with it (i.e. looks like it may be expensive as the number of
ordinals grow...).
Mike found a bug in how I count up the parents in the NO_PARENTS case, so I
fixed it (and added a test). I'll run tests a couple of times and commit this.
> Explore facets aggregation during documents collection
> ------------------------------------------------------
>
> Key: LUCENE-4600
> URL: https://issues.apache.org/jira/browse/LUCENE-4600
> Project: Lucene - Core
> Issue Type: Improvement
> Components: modules/facet
> Reporter: Michael McCandless
> Assignee: Shai Erera
> Attachments: LUCENE-4600-cli.patch, LUCENE-4600.patch,
> LUCENE-4600.patch, LUCENE-4600.patch, LUCENE-4600.patch, LUCENE-4600.patch,
> LUCENE-4600.patch, LUCENE-4600.patch
>
>
> Today the facet module simply gathers all hits (as a bitset, optionally with
> a float[] to hold scores as well, if you will aggregate them) during
> collection, and then at the end when you call getFacetsResults(), it makes a
> 2nd pass over all those hits doing the actual aggregation.
> We should investigate just aggregating as we collect instead, so we don't
> have to tie up transient RAM (fairly small for the bit set but possibly big
> for the float[]).
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