qiuliang988 opened a new issue #795:
URL: https://github.com/apache/submarine/issues/795


   Hi, We ran into a problem with Submarine's Spark Security for Column Masking
   For example, 
   select col_1, col_2 from tbl_1 union select col_3, col_4 from tbl_2
   If masking policies for col_2 and col_4 are different, col_4 will use 
col_2's policy instead of its own
   because col_4 is not in "plan.output"
   
![image](https://user-images.githubusercontent.com/67689926/141068525-6bb2f58e-3b57-40ed-b91a-f14c618e05c3.png)


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