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lynxworld
lynx
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新增函数支持, 修改了一系列函数实现
修复collect(n)返回结果丢失n类型, 返回Any的问题
完善functions文档
调整项目结构, 目前拆分types
完善了Duration和Time
TODO List:
1. 优化器改进:完善基于成本的优化器,包括动态规划算法,成本因子估算,基数估计等。在https://github.com/HC-teemo/lynx/tree/CBO这个仓库中完成了一部分。
2. 物理计划算子完善:补充和拆分现有的物理计划类型,例如NodeScan可进一步拆分细化NodeSeekByID,NodeSeekByIndex,AllNode等,这有助于优化器对计划进行更细粒度的调整和重写。
3. DataFrame改进:
3.1 完善DataFrame的操作,改进性能
3.2 基于如Apache Arrow等统一内存格式实现新的DataFrame
4. 优化规则:
4.1 改进规则引擎:目前优化规则的表达过于复杂,可设计新的规则引擎简化规则表达
4.2 规则完善:增加常见的优化规则
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