[bduerst]

Think of rETL as an on-demand data lake that doesn't actually store any data (for the most part).

Yeah you can pull data and create snapshots to preserve views, but given the direction privacy and regulatory environments have been going with user data, it's incredibly sexy to be able to not have to dump data in yet another data warehouse just to use a new tool.

[eru]

Perhaps the proper programming term might be co-ETL or co-data-lake? (Where we use 'co' in the same sense as eg http://blog.ezyang.com/2012/10/duality-for-haskellers/ )