Cannot overwrite table portrayal.FrequentlyStopAddr that is also being read from;

背景原因：
spark SQL select 一个表，然后在overwrite 一个表

解决：

//将结果保存在临时表中    
spark.sql("select  *  from result_tab").write.mode(SaveMode.Overwrite).saveAsTable("tmp_tab")
// 计算逻辑
........
//将临时表覆盖结果表
spark.sql("select * from tmp_tab").write.mode(SaveMode.Overwrite).saveAsTable("result_tab")