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参考官方文档增加了两个链接。 #8

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参考官方文档增加了两个链接。 #8

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10 changes: 8 additions & 2 deletions docs/spark有哪几种join.md
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- **fullOuterJoin**

fullOuterJoin会保留两个RDD中所有的key，因此所有的值列都有可能出现缺失的情况，所有的值列都会转为Some对象。

- **Semi Join**

半连接，只返回从与右侧匹配上的值。它也被称为左半连接。

- **Anti Join**


反连接从左表返回与右表不匹配的值。它也被称为左反连接

[参考文章](<http://www.neilron.xyz/join-in-spark/>)

https://spark.apache.org/docs/3.0.0/sql-ref-syntax-qry-select-join.html