[6.1 用Bitmap实现精确去重](6.1%E7%94%A8Bitmap%E5%AE%9E%E7%8E%B0%E7%B2%BE%E7%A1%AE%E5%8E%BB%E9%87%8D.md) [6.2 用HLL实现近似去重](6.2%E7%94%A8HLL%E5%AE%9E%E7%8E%B0%E8%BF%91%E4%BC%BC%E5%8E%BB%E9%87%8D.md) [6.3 物化视图](6.3%E7%89%A9%E5%8C%96%E8%A7%86%E5%9B%BE.md) [6.4 Colocation Join](6.4ColocationJoin.md) [6.5 外部表](6.5%E5%A4%96%E9%83%A8%E8%A1%A8.md) [6.6 数组使用](6.6%E6%95%B0%E7%BB%84%E4%BD%BF%E7%94%A8.md) [6.7 窗口函数](6.7%E7%AA%97%E5%8F%A3%E5%87%BD%E6%95%B0.md) [6.8 CBO优化器](6.8CBO%E4%BC%98%E5%8C%96%E5%99%A8.md) [6.9 Lateral Join](6.9LateralJoin.md)