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fix link in Week8_9,10_11,12_13 README
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Week10_11-Executor/README.md

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# Week10,11 Executor
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> 学习执行算子,如 Join, Agg, Scan 的不同实现,实现 Hash Join 算子并完成性能调优。
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Hash Join可以完成PingCap Talent Plan里面的[Join](https://github.com/IcePigZDB/talent-plan/tree/master/tidb/join)
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Hash Join可以完成PingCap Talent Plan里面的[Join](https://github.com/pingcap/talent-plan/tree/master/tidb/join)
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# Week12,13 Distributed System
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> 分布式相关概念、时钟、CAP、BASE、分布式事务(2PC / 3PC, TCC, Percolator, LCN, Seata)、RPC、MapRudece,阅读 MapReduce 论文,并结合相关框架实现一个单词统计程序。参考 MIT6.824 课程、Spark。
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MapReduce可以完成Mit6.824 [Lab1](https://pdos.csail.mit.edu/6.824/)或者PingCap Talent Plan里面的[MapReduce](https://github.com/IcePigZDB/talent-plan/tree/master/tidb/mapreduce)
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MapReduce可以完成Mit6.824 [Lab1](https://pdos.csail.mit.edu/6.824/)或者PingCap Talent Plan里面的[MapReduce](https://github.com/pingcap/talent-plan/tree/master/tidb/mapreduce)
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Week8_9-SQL-Optimizer/README.md

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# Week8,9 SQL Optimizer
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> 学习常见优化器架构,如 Volcano, Cascades 等,学习查询优化具体流程。实现一个并发的 MergeSort 算法,并完成性能调优。
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MergeSort可以完成PingCap Talent Plan里面的[MergeSort](https://github.com/IcePigZDB/talent-plan/tree/master/tidb/mergesort)
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MergeSort可以完成PingCap Talent Plan里面的[MergeSort](https://github.com/pingcap/talent-plan/tree/master/tidb/mergesort)

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