Get the unique values in every sub-array

Description

Usage

<Expr>$arr$unique(..., maintain_order = FALSE)

Arguments

… These dots are for future extensions and must be empty.

maintain_order Maintain order of data. This requires more work.

Value

A polars expression

Examples

library("polars")

df <- pl$DataFrame(
  values = list(c(1, 1, 2), c(4, 4, 4), c(NA, 6, 7)),
)$cast(pl$Array(pl$Float64, 3))
df$with_columns(unique = pl$col("values")$arr$unique())

#> shape: (3, 2)
#> ┌──────────────────┬──────────────────┐
#> │ values           ┆ unique           │
#> │ ---              ┆ ---              │
#> │ array[f64, 3]    ┆ list[f64]        │
#> ╞══════════════════╪══════════════════╡
#> │ [1.0, 1.0, 2.0]  ┆ [1.0, 2.0]       │
#> │ [4.0, 4.0, 4.0]  ┆ [4.0]            │
#> │ [null, 6.0, 7.0] ┆ [null, 6.0, 7.0] │
#> └──────────────────┴──────────────────┘