Function groonga_sys::groonga::grn_geo_estimate_size_in_rectangle

pub unsafe extern "C" fn grn_geo_estimate_size_in_rectangle(
    ctx: *mut grn_ctx, 
    index: *mut grn_obj, 
    top_left_point: *mut grn_obj, 
    bottom_right_point: *mut grn_obj
) -> c_uint