hc128168 commented on issue #9737:
URL: 
https://github.com/apache/incubator-superset/issues/9737#issuecomment-624087543


   Thanks for sharing the tip Eugenia!
   
   I briefly watched your video, and I think the use case is slightly 
difference.  Your case is to have two different charts showing on the same 
chart.  Both charts use the same set of data but one has a transformation.
   
   My case is a bit different that I have multiple lines group by symbol (and 
is_bid...but we can drop this field to simplify), and I just want to transform 
all lines with forward fill (ffill).
   
   My timestamps have millisecond precision and so the rule should be 1ms?
   
   I just tried to set rule = 1s and fill method = ffill, and re-ran the query. 
 It makes no difference to my chart.
   
   Thanks!


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