Expand the struct into its individual fields

Description

This is an alias for Expr$struct$field("*").

Usage

<Expr>$struct$unnest()

Value

A polars expression

Examples

library("polars")

df <- pl$DataFrame(
  aaa = c(1, 2),
  bbb = c("ab", "cd"),
  ccc = c(TRUE, NA),
  ddd = list(1:2, 3)
)$select(struct_col = pl$struct("aaa", "bbb", "ccc", "ddd"))
df

#> shape: (2, 1)
#> ┌────────────────────────────┐
#> │ struct_col                 │
#> │ ---                        │
#> │ struct[4]                  │
#> ╞════════════════════════════╡
#> │ {1.0,"ab",true,[1.0, 2.0]} │
#> │ {2.0,"cd",null,[3.0]}      │
#> └────────────────────────────┘

df$select(pl$col("struct_col")$struct$unnest())

#> shape: (2, 4)
#> ┌─────┬─────┬──────┬────────────┐
#> │ aaa ┆ bbb ┆ ccc  ┆ ddd        │
#> │ --- ┆ --- ┆ ---  ┆ ---        │
#> │ f64 ┆ str ┆ bool ┆ list[f64]  │
#> ╞═════╪═════╪══════╪════════════╡
#> │ 1.0 ┆ ab  ┆ true ┆ [1.0, 2.0] │
#> │ 2.0 ┆ cd  ┆ null ┆ [3.0]      │
#> └─────┴─────┴──────┴────────────┘