[Backport] Add BitVectors format and make flat vectors format easier to extend (#13288) #13316
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…pache#13288) Instead of making a separate thing pluggable inside of the FieldFormat, this instead keeps the vector similarities as they are, but allows a custom scorer to be provided to the FlatVector storage used by HNSW. This idea is akin to the compression extensions we have. But in this case, its for vector scorers. To show how this would work in practice, I took the liberty of adding a new HnswBitVectorsFormat in the sandbox module. A larger part of the change is a refactor of the `RandomAccessVectorValues<T>` to remove the `<T>`. Nothing actually uses that any longer, and we should instead rely on well defined classes and stop relying on casting with generics (yuck).
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Instead of making a separate thing pluggable inside of the FieldFormat, this instead keeps the vector similarities as they are, but allows a custom scorer to be provided to the FlatVector storage used by HNSW.
This idea is akin to the compression extensions we have. But in this case, its for vector scorers.
To show how this would work in practice, I took the liberty of adding a new HnswBitVectorsFormat in the sandbox module.
A larger part of the change is a refactor of the
RandomAccessVectorValues<T>to remove the<T>. Nothing actually uses that any longer, and we should instead rely on well defined classes and stop relying on casting with generics (yuck).