Method is_covering

nodedb/src/engine/sparse/gsi.rs:318–328

Check if a GSI covers all projected columns (covering index query). A covering index includes the indexed field + all payload_fields. If the query projection is a subset, we can serve the query from the GSI without a primary document fetch.

(meta: &GsiMeta, projection: &[String])

    /// If the query projection is a subset, we can serve the query from
    /// the GSI without a primary document fetch.
    pub fn is_covering(meta: &GsiMeta, projection: &[String]) -> bool {
        if projection.is_empty() {
            return false; // SELECT * always needs primary.
        }
        projection.iter().all(|col| {
            col == &meta.field
                || col == "id"
                || col == "document_id"
                || meta.payload_fields.contains(col)
        })
    }
}

#[cfg(test)]