当遍历结束之后，我们将列数组分配给表的 “columns” 属性。

When the loop is over, we assign the array of columns to the table's property "columns."

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arraylets将大数组分为一些小的数组，以使没有进行碎片整理的堆更容易满足大数组分配请求。

Arraylets break up large arrays into smaller pieces to make large array allocations easier to satisfy without defragmenting the heap.

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所有具有内部缓冲区的流都应重写此方法，提供一个直接写入缓冲区的有效得多的版本，以避免每次调用时都要进行额外的数组分配。

Any stream with an internal buffer should override this method and provide a much more efficient version that writes to the buffer directly, avoiding the extra array allocation on every call.

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