Function path_select_all 

pub fn path_select_all<'a>(
    jsonb_bytes: &[u8],
    path: &'a JsonPath<'a>,
) -> Result<Vec<Vec<u8>>, DataFusionError>

All matches of a parsed JSONPath, as separate values — not wrapped in one JSONB array (that’s select_array_by_path, used by jsonb_path_query). An empty result means zero matches, not an error.