An SQL interface for R dataframes built on the DuckDB embedded
analytical database. Dataframes are registered directly with an in-process
DuckDB instance and queried with standard SQL, so analyses can join,
filter, aggregate and reshape R objects with SQL while results are
returned as dataframes, without copying data to an external database
server. The package wraps the 'duckdb' R package with a DBI-compliant
connection and provides a small, checked surface for the common
register-query-unnregister workflow. The underlying engine and its
vectorised execution model are described in Raasveldt and Mühleisen
(2019)