benwtrent commented on issue #13564:
URL: https://github.com/apache/lucene/issues/13564#issuecomment-2476505715
> then it seems we can just call exactSearch over the results of
approximateSearch,
Exact search will hopefully just be using the quantized values as well.
> However I don't know how to get the full-sized vectors without
LeafContextReader. Do you have an idea how we can achieve that?
I don't see why that would be a problem. How I would understand this is you
would need to iterate the segments twice regardless.
- Once to get the top k as desired with the oversampling
- Apply the brute-force reranking (by passing the "exactSearch" path as
that uses quantized values).
However, the query shouldn't bother attempting to rerank results that are
considered "accurate".
So, the collector will likely need to be told "Hey, these are estimations",
and then a second pass over the top docs there would be possible via something
like `if(collector.scoresAreEstimates)`
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