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https://issues.apache.org/jira/browse/LUCENE-10325?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17513732#comment-17513732
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Greg Miller commented on LUCENE-10325:
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Also opened LUCENE-10488 to track other optimizations.
> Add getTopDims functionality to Facets
> --------------------------------------
>
> Key: LUCENE-10325
> URL: https://issues.apache.org/jira/browse/LUCENE-10325
> Project: Lucene - Core
> Issue Type: Improvement
> Components: modules/facet
> Reporter: Greg Miller
> Priority: Major
> Fix For: 9.2
>
> Time Spent: 9h
> Remaining Estimate: 0h
>
> The current {{getAllDims}} functionality is really the only way for users to
> determine the "top" dimensions in a faceting field (i.e., get the top dims by
> count along with their top-n children), but it has the unfortunate
> side-effect of resolving all child paths for every dim, even if the user
> doesn't intend to use those dims. For example, if a match set contains docs
> relating to 100 different dims (and various values under each), but the user
> only wants the top 10 dims with their top 5 children, they can call
> getAllDims(5) then just grab the first 10 results, but a lot of wasted work
> has been done for the other 90 dims.
> It would be nice to implement something like {{getTopDims(int numDims, int
> numChildren)}} that would only do the work necessary to resolve {{numDims}}
> dims instead of all dims.
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