@rgoddard - May be a bit overkill but check out Immuta (www.immuta.com). Its a data platform, built for data scientists, that enables you to query across many disparate sets of data using familiar patterns such as SQL, file system, etc. Our SQL interface allows you to hook to Excel, Tableau, Pentaho...so you could write your abstracted logic and connect to many data sources or mashed up analytic results. contact me at [email protected] if you're interested after reading through the site.