One may ask: "why share new packages with an "R Language Beginners Group?" (Though, I prefer to use the term "part time R user".) Because: such packages can give such users easy, safe, consistent, and performant access to powerful data systems. rquery establishes a notation and links to external data providers such as PostgreSQL, Amazon Redshift, and Apache Spark. rqdatatable supplies an additional in-memory implementation of the rquery notation using the powerful data.table package.
rquery and rqdatatable can, if given a fair chance, be significant R tools. Users are that chance.
If you are around please come see the talk.
Some earlier articles on rquery and rqdatatable can be found here and here.