stefanvodita commented on issue #13166:
URL: https://github.com/apache/lucene/issues/13166#issuecomment-2039818948
The demo would facet over docs in the main index and aggregate over values
stored in the taxonomy, e.g. using `IntTaxonomyFacets`. The missing piece is
reading values from the taxonomy for aggregation. The faceting class accepts a
doc values iterator which provides values. I think we need to set up an
iterator that gets the taxonomy value corresponding to a doc in the main index.
```
Rough example:
Main index: {docid: 0, author: Tolkien}, {docid: 1, author: Lewis}, {docid:
2, author: Tolkien}
Taxonomy: {docid: 0, null}, {docid: 1, author}, {docid: 2, Tolkien, score:
9}, {docid: 3, Lewis, score: 8}
Iterator: {0 -> 9, 1 -> 8, 2 -> 9}
Explanation:
For docid 0 in the main index, we have Tolkien, which we find at docid 2 in
the taxonomy, which corresponds to score 9. We put {0 -> 9} in the iterator.
For docid 1 in the main index, we have Lewis, which we find at docid 3 in
the taxonomy, which corresponds to score 8. We put {1 -> 8} in the iterator.
For docid 2 in the main index, we have Tolkien, which we find at docid 2 in
the taxonomy, which corresponds to score 9. We put {2 -> 9} in the iterator.
```
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