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Cast to physical representation of the logical dtype

Description

The following data types will be changed:

  • Date -\> Int32
  • Datetime -\> Int64
  • Time -\> Int64
  • Duration -\> Int64
  • Categorical -\> UInt32
  • List(inner) -\> List(physical of inner)

Other data types will be left unchanged.

Usage

<Expr>$to_physical()

Value

A polars expression

Examples

library("polars")

df <- pl$DataFrame(a = factor(c("a", "x", NA, "a")))
df$with_columns(
  phys = pl$col("a")$to_physical()
)

#> shape: (4, 2)
#> ┌──────┬──────┐
#> │ a    ┆ phys │
#> │ ---  ┆ ---  │
#> │ cat  ┆ u32  │
#> ╞══════╪══════╡
#> │ a    ┆ 0    │
#> │ x    ┆ 1    │
#> │ null ┆ null │
#> │ a    ┆ 0    │
#> └──────┴──────┘