Binary formats (3)

• read_parquet(col_select =) returns a data frame (with selected columns)
• read_parquet(as_data_frame = FALSE) returns the more low-level Arrow Table object

R object attributes are preserved when writing data to Parquet or Arrow/Feather files and when reading those files back into R.

Can handle in-memory data and on-disk data larger than memory.

In both cases, can be exchanged with other applications without copying data.