Function metric_from_func_name

nodedb-sql/src/planner/select/helpers.rs:195–203

Map a vector distance function name to its `DistanceMetric`. `vector_distance` (and the rewritten `<->` operator) → L2; `vector_cosine_distance` (and `<=>`) → Cosine; `vector_neg_inner_product` (and `<#>`) → InnerProduct. Unknown names default to L2 — callers must gate on a `VectorSearch` search-trigger before invoking this so unknown names cannot leak in.

(name: &str)

/// Unknown names default to L2 — callers must gate on a `VectorSearch`
/// search-trigger before invoking this so unknown names cannot leak in.
pub(super) fn metric_from_func_name(name: &str) -> DistanceMetric {
    if name.eq_ignore_ascii_case("vector_cosine_distance") {
        DistanceMetric::Cosine
    } else if name.eq_ignore_ascii_case("vector_neg_inner_product") {
        DistanceMetric::InnerProduct
    } else {
        DistanceMetric::L2
    }
}

/// Extract a float array from ARRAY[...], make_array(...), or a JSON-array
/// string literal like `'[1.0, 0.5, 0.0]'`.