The greater this value is, the less merge on the disk, thus reducing I/O times on the local disk during the reduce phase.
这个值越大，磁盘上的合并就越少，因此会减少reduce 阶段本地磁盘上的I/O时间。
Next, the rewrite phase will merge ORDERS_VIEW into the topmost JOIN operation.
接着，重写阶段将把ORDERS_VIEW合并到顶层的JOIN操作中。
Next, the rewrite phase will merge ORDERS_VIEW into the topmost JOIN operation.
接着，重写阶段将把ORDERS_VIEW合并到顶层的JOIN操作中。
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