Simpler coding than the fixed-size buffer approach

比固定大小的缓冲区方法更简单的代码编写

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When this approach is in use, hashed rows destined for a given partition are placed in a buffer and sent to that partition as a group instead of one at a time.

如果使用了这种方法，定向于某个给定分区的散列行首先会进入一个缓冲区中，然后成组地发送到那个分区，而不是一次发送一行。

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Unfortunately, this approach itself can become a performance bottleneck if the size of the data requested is considerably larger than the kernel buffer size.

不幸的是，如果所需数据量远大于内核缓冲区大小的话，这个方法本身可能成为一个性能瓶颈。

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