lilila edited a comment on issue #10218:
URL: 
https://github.com/apache/incubator-superset/issues/10218#issuecomment-675389725


   I found out the problem (at least for the table export) comes from this line 
:
   
https://github.com/apache/incubator-superset/blob/ca9ca995109ee5251918b9df60980bffaf9b9a24/superset/viz.py#L325
   
   
   The set function does not preserve the original order , I have seen this 
`list(set( .... ))` or `set(gb)` in many places in the viz.py file. 
   Is there any better way to preserve columns' order and make sure there is no 
duplicate? 
   
    
   


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