spark里怎么refresh表？

跑一个程序spark提示报错（具体描述见下），大概的意思就是说要refresh table，请问应该怎么refresh呢？

The underlying files may have been updated. 
You can explicitly invalidate the cache in Spark by running 'REFRESH TABLE tableName' command in SQL or by recreating the Dataset/DataFrame involved.

谢谢