Function polars_lazy::frame::pivot::pivot   
source ยท pub fn pivot<I0, I1, I2, S0, S1, S2>(
    df: &DataFrame,
    index: I0,
    columns: I1,
    values: Option<I2>,
    sort_columns: bool,
    agg_expr: Option<Expr>,
    separator: Option<&str>
) -> PolarsResult<DataFrame>where
    I0: IntoIterator<Item = S0>,
    I1: IntoIterator<Item = S1>,
    I2: IntoIterator<Item = S2>,
    S0: AsRef<str>,
    S1: AsRef<str>,
    S2: AsRef<str>,Available on crate feature 
pivot only.