betodealmeida commented on issue #5177: Time shift difference
URL: 
https://github.com/apache/incubator-superset/pull/5177#issuecomment-396713012
 
 
   > I think this is effectively the same as a superior Period Ratio isn't it? 
If so we should db migrate to translate the slices.
   
   I'm not familiar with the period ratio, and it doesn't seem to map 1:1 to 
the comparison types. Should I create a migration script only for those cases 
that can be mapped?
   
   > I know one difference in the backend is that Period Ratio runs 2 queries 
and merges them. So I could look at the past 28 days and compare with last 
year's same period. I'm not sure if Time Shift can do that or it would 
query/show more than 28 days (which may be ok). What do you think?
   
   How I would that with the period ratio? For time shift you would select the 
last 28 days and then use "1 year" as the time shift.

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