vroom_altrep() can be used directly as input to the
A character vector of column types to use Altrep for. Can also
Alternatively there is also a family of environment variables to control use of
the Altrep framework. These can then be set in your
.Renviron file, e.g.
usethis::edit_r_environ(). For versions of R where the Altrep
framework is unavailable (R < 3.5.0) they are automatically turned off and
the variables have no effect. The variables can take one of
VROOM_USE_ALTREP_NUMERICS - If set use Altrep for all numeric types
There are also individual variables for each type. Currently only
VROOM_USE_ALTREP_CHR defaults to
1 2 3 4
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