A fst object can be used to access a fst data store as a data.frame object

[MarcusKlik]

After initializing a fst object, the underlying fst file can be accessed in the same manner as a data.frame.

[MarcusKlik]

This was implemented in fst 0.8.4:

# some test fst file
fst::write_fst(data.frame(X = 1:10, Y = LETTERS[11:20]), "1.fst")

# get a data.frame-like reference object
ft <- fst::fst("1.fst")

# access object like a data.frame
ft[2:4, "Y"]
#> [1] L M N
#> Levels: K L M N O P Q R S T