Hi, Some background: I've been working on this PR to add hyper rectangle faceting <https://github.com/apache/lucene/pull/841> capabilities to Lucene facets and I needed to create a new doc values field to support this feature. Initially, I had a field that just extended BinaryDocValues, but then a discussion came up about whether to add a completely new DocValues field, maybe something like PointDocValuesField (and SortedPointDocValuesField as the multivalued version) to add first class support for this new field. Here is the link to the discussion <https://github.com/apache/lucene/pull/841#discussion_r879869751>. I think there are a few benefits to this:
- Formalize how we would store points as doc values rather than just packing points into a BinaryDocValues field in a format that could change at any time - NumericDocValues enables us to create a SortedNumericDocValuesRange query which can be used with IndexOrDocValuesQuery to make some range queries more efficient. Adding this new doc values field would let us do the same thing with higher dimensional ranges I'm sure I could be missing some benefits, and I also am not super experienced with Lucene so there could be drawbacks I am missing as well :). From what I understand though, Lucene doesn't have a lot of DocValues fields and there should be some thought put into adding new ones, so I was wondering if I could get some feedback about the idea. Thanks!
