Using booleans in LanceDB

Hello, your friendly neighborhood computational chemist here!

I'd like to be able to perform vector searches over binary / boolean fields (in this case, molecular fingerprints e.g., https://chemicbook.com/2021/03/25/a-beginners-guide-for-understanding-extended-connectivity-fingerprints.html).

but it won't let me ->

ValueError: LanceError(IO): Column fingerprint is not a vector column (type: FixedSizeList(Field { name: "item", data_type: Boolean, nullable: true, dict_id: 0, dict_is_ordered: false, metadata: {} }, 2048)), /home/runner/work/lance/lance/rust/lance/src/dataset/scanner.rs:384:35

import pyarrow as pa
import lancedb
from lancedb.pydantic import LanceModel, Vector

class Molecule(LanceModel):
    id: str
    smiles: str
    fingerprint: Vector(2048, pa.bool_())

uri = "./out/strict_fragments.lancedb"
db = lancedb.connect(uri)

tbl = db.create_table(
    "molecules",
    schema = Molecule,
    mode = 'overwrite'
)

Neither does it work with any flavor of integer. It would be amazing to get this working because the sparse booleans obviously take up much less room on disk. These fingerprints are often very sparse, so it would be even better if we could use a sparse format like SparseTensor in Arrow. In addition, Jaccard is the preferred distance metric, but Cosine or inner product are preferable to euclidean.