pdeva opened a new issue #8379: backfill results for unavailable time ranges 
from sql queries
URL: https://github.com/apache/incubator-druid/issues/8379
 
 
   ### Description
   
   Add an option to SQL query context to backfill missing ranges of a metric 
with NaN or 0.
   
   
   ### Motivation
   
   Here is a set of graphs retrieved from the results of a single druid sql 
query.
   The 2 graph starts at 12:00 while the others start at 11:00.
   
   
![image](https://user-images.githubusercontent.com/3190176/63561545-33750880-c50f-11e9-8e98-e738d6bb8548.png)
   
   this is because the 'command rate' metric has no data before 12:00.
   
   ideally all these graphs should have the same time range and either show 0 
or missing value for ranges where no data was available.
   
   Currently this requires doing a separate pass in the client to ensure the 
full range is available for the given client. Ideally this should just be an 
option passed to druid sql which fills missing timeranges with 0 or NaN.
   
   

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