mikemccand commented on pull request #271:
URL: https://github.com/apache/lucene/pull/271#issuecomment-907633653


   These arrays are in general a crazy costly part of using taxonomy facets ... 
we should explore more efficient alternatives.  E.g. if the Lucene user is only 
using a single level hierarchy (field `foo` and value `bar`), maybe we could 
pre-allocate slices of ordinal space to each field `foo` which could be stored 
much more compactly (e.g. an interval tree) than the full `int[] parents` array 
we use today.


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