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Update blog
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lewiszlw committed Sep 9, 2024
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4 changes: 2 additions & 2 deletions content/blog/2024-05-10-datafusion-paper/index.md
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Expand Up @@ -69,8 +69,8 @@ DataFusion 采用基于 Pull 的流式执行引擎。物理计划使用一个或
内置实现了业界广泛使用的优化
1. 查询重写:逻辑计划重写如谓词下推、表达式简化,物理计划重写如消除不必要排序、最大化并行度、join算法选择。
2. 排序:如针对 Limit(topk)优化,内存不足时临时写入磁盘
3. 分组和聚合优化
4. 连接:支持 hash join/merge join/symmetric hash join/nested loops join/cross join
3. 分组和聚合优化:两阶段并行哈希分组聚合
4. 连接:支持 hash join / merge join / symmetric hash join / nested loops join / cross join
5. 窗口函数
6. Normalized Sort Keys / RowFormat
7. 有效利用排序顺序
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