[doc](random_sink) Add some doc content about random sink #13577
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| @@ -338,12 +338,18 @@ Doris 支持两层的数据划分。第一层是 Partition，支持 Range 和 Li | |||
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| > 注：表的数据量可以通过 [`SHOW DATA`](../sql-manual/sql-reference/Show-Statements/SHOW-DATA.md) 命令查看，结果除以副本数，即表的数据量。 | |||
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| 4. **关于 Random Distribution 的设置以及使用场景。** | |||
| - 如果 OLAP 表没有更新类型的字段，将表的数据分桶模式设置为 RANDOM，则可以避免严重的数据倾斜。 | |||
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这里加一下 random distribution 的原理说明吧。比如设置random 后，数据是“如何”被指定到“哪一个”tablet的。
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