分区允许应用程序对自己进行分区，然后将输入工作专门路由到单个分区中。
Partitioning allows the application to partition itself and then route incoming work exclusively to a single partition.
启用查询的并行化，并由负责将输入序列拆分成各个分区的自定义分区程序指明其出处。
Enables parallelization of a query, as sourced by a custom partitioner that is responsible for splitting the input sequence into partitions.
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