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#general
Title
# general
s

sriramdas sivasai

07/11/2021, 7:59 PM
Hi everyone, we are evaluating the druid and pinot for one our usecase. just to understand, is the
startTree index
in pinot and
roll-up
in druid are same ? or anything different ?
m

Mayank

07/11/2021, 8:58 PM
StarTree is a specialized index that helps you customize level of preaggregation vs storage cost to best serve your needs. This is unique to Pinot and no other system has it.
s

sriramdas sivasai

07/11/2021, 9:28 PM
exactly druid's
roll-up
does the same thing i guess. please correct me if i'm wrong.
k

Kishore G

07/11/2021, 9:34 PM
roll-up is simple aggregation across all dimensions
StarTree index is roll up across every dimension combination.. think of pre-cube
Only difference is star tree index pre cubes only certain combinations
And thus avoids data explosion

https://www.youtube.com/watch?v=bwO0HSXguFA

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sriramdas sivasai

07/12/2021, 3:40 AM
Ok @User understood. thanks.