pdeva commented on issue #8041: Undocumented, seemingly random choosing of 
inital value timestamp for SQL results
URL: 
https://github.com/apache/incubator-druid/issues/8041#issuecomment-509453053
 
 
   to clarify, with the 07:50-37:00 time range example, i am saying:
   
   ```
   starting at 07:50
   rollup results in 60 second batches,
   do so till you hit 37:00
   ```
   thus results with timerange 07:50-08:50, 08:50-09:50, etc.
   
   However, druid interprets as :
   
   ```
   starting at 07:00,
   rollup results in 60 second batches,
   but wait, initial timestamp is 07:50, 
   so for first value specify timestamp at 07:00, but consider values from 
07:50 to 08:00
   ```
   
   resulting in 07:00-08:00, 08:00-09:00, etc..
   
   which seems very random....

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