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Update SparkSQL外部数据源.md

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@ -368,7 +368,7 @@ df.write
## 七、Text ## 七、Text
ext文件在读写性能方面并没有任何优势，且不能表达明确的数据结构，所以其使用的比较少，读写操作如下： Text文件在读写性能方面并没有任何优势，且不能表达明确的数据结构，所以其使用的比较少，读写操作如下：
### 7.1 读取Text数据 ### 7.1 读取Text数据