query.nearest_unindexed: Nearest-neighbour order on a vector with no fixed length

Nearest-neighbour order on a vector with no fixed length.

Area 21, AI; not declinable; the next step is usually the agent's.

nearest on a vector field whose type has no dimensions:: a plain Vector, or an Embedding, which keeps its vector without a length. pgvector builds an HNSW index only on a column of fixed length.

example

/// A reply an agent is still writing, with its meaning as a model made it.entity DraftReply {    id: Uuid    reply_meaning: Vector}/// The five replies nearest one being written.query similar_drafts(reply_meaning: Vector) -> List<Nearest<DraftReply>> {    from: DraftReply    order: [DraftReply.reply_meaning nearest reply_meaning]    limit: 5}

text

error: `DraftReply.reply_meaning` has no fixed length, so no index can order it by nearness --> main.jadpo:10:13   |10 |     order: [DraftReply.reply_meaning nearest reply_meaning]   |             ^^^^^^^^^^^^^^^^^^^^^^^^ a `Vector` without `dimensions:`  reason: A nearest-neighbour query reads an HNSW index, which pgvector builds only on a vector column of fixed length, and `DraftReply.reply_meaning` is a `Vector`, kept without one.  next: Give `DraftReply.reply_meaning` a type built on `Vector` with the model's `dimensions:` (agent)  rule: query.nearest_unindexed  help: https://jadpo.dev/docs/errors/query.nearest_unindexedcheck failed: 1 error, 1 file