https://cn.greenplum.org 博文 · 资料 · 文档 · 项目 Greenplum内核揭秘之排序算法 5 ● 内排序算法 ● 外排序算法 ● Greenplum TupleSort ● 排序在Greenplum中的应用 Outline 6 ● 冒泡排序 ● 插入排序 ● 快速排序 ● 堆排序 ● 基数排序 内排序算法 7 快速排序是最常用的排序算法，由Tony 从下层Outer节点读取所有元组，并传递给tuplesort模块进行排序 排序节点 37 TupleSort是排序节点的核心，算法主要阶段： ● 第一阶段初始化TupleSort，通过调用函数tuplesort_begin_common，生成 Tuplesortstate。Tuplesortstate用于描述排序所需的信息 ● 第二阶段插入元组，每次调用函数puttuple_common，会根据当前TupleSort的 状态，选择将元组插入到不同的位置。 第三阶段负责实际的排序逻辑，通过调用函数tuplesort_performsort，实现对已 经存储好的输入元组进行排序。根据当前TupleSort的不同状态，输入元组可能 存储在内存或者文件中，TupleSort会选择使用不同的算法进行排序。 ● 第四阶段负责输出排序后元组，在排序完成之后，每次调用函数 tuplesort_gettuple_common，即可获取排序后的元组。同样，根据当前 TupleSort的不同状态，算法选择不同的方式返回有序元组。

Resolved an issue which caused the database to PANIC due to a double free of the memory context TupleSort. Release 6.16.1 Release Date: 2021-5-21 VMware Tanzu Greenplum 6.16.1 is a maintenance release

Resolved an issue which caused the database to PANIC due to a double free of the memory context TupleSort. Release 6.16.1 Release Date: 2021-5-21 VMware Tanzu Greenplum 6.16.1 is a maintenance release

Resolved an issue which caused the database to PANIC due to a double free of the memory context TupleSort. Release 6.16.1 Release Date: 2021-5-21 VMware Tanzu Greenplum 6.16.1 is a maintenance release

Resolved an issue which caused the database to PANIC due to a double free of the memory context TupleSort. Release 6.16.1 Release Date: 2021-5-21 VMware Greenplum 6.16.1 is a maintenance release that

Resolved an issue which caused the database to PANIC due to a double free of the memory context TupleSort. Release 6.16.1 Release Date: 2021-5-21 VMware Tanzu Greenplum 6.16.1 is a maintenance release

due to a double free of the memory VMware Greenplum 6 Documentation VMware, Inc 187 context TupleSort. Release 6.16.1 Release Date: 2021-5-21 VMware Tanzu Greenplum 6.16.1 is a maintenance release

Resolved an issue which caused the database to PANIC due to a double free of the memory context TupleSort. Release 6.16.1 Release Date: 2021-5-21 VMware Tanzu Greenplum 6.16.1 is a maintenance release

Resolved an issue which caused the database to PANIC due to a double free of the memory context TupleSort. Release 6.16.1 Release Date: 2021-5-21 VMware Tanzu Greenplum 6.16.1 is a maintenance release

Resolved an issue which caused the database to PANIC due to a double free of the memory context TupleSort. Release 6.16.1 Release Date: 2021-5-21 VMware Greenplum 6.16.1 is a maintenance release that