order by/sort by/distribute by /cluster by 的區分
主要說說這3者的區分和場景：
1.order by:這是日常使用最多的，因為是最終的排序，所以是全域性的，所以最後只會有1個reduce(set mapred.reduce.tasks=n無效)完成。假如sql的執行結果的資料量很大的話，這裡就會比較坑。
2.sort by:sortby不是全域性排序，資料在reducer前就完成排序。sortby只會保證每個reducer的輸出是有序的，sortby不受hive.mapred.mode屬性的影響。我們可以set mapred.reduce.tasks=n來指定reduce的個數，最後在執行order by 進行全域性的排序。
3. distribute by :distribute by 是控制map端如何拆分資料給reduce端的。hive會根據by 的列，對應reduce的個人進行分發，預設是hash演算法。
4. cluster by :等價於 distribute by columns sort by columns,但是隻能是倒敘排序
notes: distribute by 和sort by的使用場景:
1. map輸出的檔案大小不均勻
2. reduce輸出的檔案大小不均
3. 小檔案過多
4. 檔案太大。
set mapred.reduce.tasks=n
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