What is a Raw Reflection FootPrint

1

HI Guys,
I am very new to Dremio and was wondering what exactly is a footprint as i am under the impression that Dremio does not create a copy of the data. so I am just wondering what is the meaning of the raw reflection footprint.

I have a few reflections that has a footprint of 49 GB

2

@Calvin_Klyn

Reflections are columnar format PARQUET copy of the base data based on the dataset the REFLECTION is built. For example if you have a EMPLOYEES table in Postgres and you create a view on Dremio for all employees in a certain department and you create a reflection on the view. The employee data for that department will be created in the distributed storage you have specified in PARQUET format

Thanks
@balaji.ramaswamy

3

@balaji.ramaswamy

Thank you very much this actually helped.
Really appreciate the simplistic explanation

Thanks,