benwtrent opened a new pull request, #15271:
URL: https://github.com/apache/lucene/pull/15271
We should honestly just have a single quantization format. having one for
asymmetric binary and one for symmetric byte seems unnecessary.
This extends the new SQ format to support asymmetry. The initial goal is
just parity with the binary format in Lucene 10.2 (single bit docs with 4 bit
queries). But I could see this being extended further to support:
(stored <-> queried):
- 1 <-> 1, 2, 4, 8
- 2 <-> 4, 8
- 4 <-> 8
- 8 <-> 16, 32 (e.g. bfloat16 & float32 query).
However, those will all take time, and some might not even be useful.
Obviously, this will cause conflicts with @mccullocht off-heap scoring work
:(.
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