Struct TwoTierIndex 

pub struct TwoTierIndex {
    pub metadata: TwoTierMetadata,
    /* private fields */
}

Two-tier index for progressive search.

Delegates vector storage and search to frankensearch’s file-backed FSVI TwoTierIndex, with cass-specific side tables for DocumentId enum and message_id SQLite foreign keys.

Fields

metadata: TwoTierMetadata

Index metadata.

Implementations

impl TwoTierIndex

pub fn build( fast_embedder_id: impl Into<String>, quality_embedder_id: impl Into<String>, config: &TwoTierConfig, entries: impl IntoIterator<Item = TwoTierEntry>, ) -> Result<Self>

Build a two-tier index from entries.

Creates a temporary FSVI index via frankensearch’s TwoTierIndexBuilder, then opens it for search. The temp directory is kept alive as long as the index exists.

pub fn len(&self) -> usize

Get the number of documents in the index.

pub fn is_empty(&self) -> bool

Check if the index is empty.

pub fn doc_id(&self, idx: usize) -> Option<&DocumentId>

Get document ID at index.

pub fn message_id(&self, idx: usize) -> Option<u64>

Get message ID at index.

pub fn search_fast(&self, query_vec: &[f32], k: usize) -> Vec<ScoredResult>

Search using fast embeddings only.

Delegates to frankensearch’s TwoTierIndex::search_fast().

pub fn search_quality(&self, query_vec: &[f32], k: usize) -> Vec<ScoredResult>

Search using quality embeddings only.

Delegates to frankensearch’s quality search via search_fast on the quality index. Since frankensearch’s TwoTierIndex stores both tiers, we use quality_scores_for_hits with all documents as candidates.

pub fn quality_scores_for_indices( &self, query_vec: &[f32], indices: &[usize], ) -> Vec<f32>

Get quality scores for a set of document indices.

Trait Implementations

impl Debug for TwoTierIndex

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.