Representation|Metric|Exact core operator|SQL operator|Order for nearest-first search|Current SQL lifecycle
dense|L2|`DistanceMetric::L2::distance`|`<->`|ascending distance|stable
dense|Inner product|`DistanceMetric::InnerProduct::distance`|`inner_product` helper|descending raw similarity|stable
dense|Negative inner product|`DistanceMetric::NegativeInnerProduct::distance`|`<#>`|ascending distance|stable
dense|Cosine distance|`DistanceMetric::Cosine::distance`|`<=>`|ascending distance|stable
dense|L1|`DistanceMetric::L1::distance`|`<+>`|ascending distance|stable
half|L2|`DistanceMetric::L2::distance_half`|`<->`|ascending distance|experimental
half|Inner product|`DistanceMetric::InnerProduct::distance_half`|`halfvec_inner_product` helper|descending raw similarity|experimental
half|Negative inner product|`DistanceMetric::NegativeInnerProduct::distance_half`|`<#>`|ascending distance|experimental
half|Cosine distance|`DistanceMetric::Cosine::distance_half`|`<=>`|ascending distance|experimental
half|L1|`DistanceMetric::L1::distance_half`|`<+>`|ascending distance|experimental
sparse|L2|`DistanceMetric::L2::distance_sparse`|`<->`|ascending distance|experimental
sparse|Inner product|`DistanceMetric::InnerProduct::distance_sparse`|`sparsevec_inner_product` helper|descending raw similarity|experimental
sparse|Negative inner product|`DistanceMetric::NegativeInnerProduct::distance_sparse`|`<#>`|ascending distance|experimental
sparse|Cosine distance|`DistanceMetric::Cosine::distance_sparse`|`<=>`|ascending distance|experimental
sparse|L1|`DistanceMetric::L1::distance_sparse`|`<+>`|ascending distance|experimental
bit|Hamming|`BitVector::hamming_distance`|`<~>`|ascending distance|experimental
bit|Jaccard distance|`BitVector::jaccard_distance`|`<%>`|ascending distance|experimental