> How do you query this data or join or filter across such disparate sources? The only two solutions today are to put ALL data into a warehouse or to write cust

> How do you query this data or join or filter across such disparate sources? The only two solutions today are to put ALL data into a warehouse or to write custom scripts. Isn't this whole problem space already addressed by a bunch of multi-source query engines (falling under the buzzword "Data Virtualization"?)