Function table_merge_rules 

pub fn table_merge_rules(
    rules: Vec<NativeRule>,
    coordinates: Vec<(u8, Vec<f64>)>,
    tolerance: f64,
    join: f64,
) -> Result<Vec<NativeRule>, Error>

固定vendor合并内核；簇均值由兼容层按旧Python版本的求和语义提供。