pub trait CrossJoin: IntoDf {
    // Provided methods
    fn cross_join_dfs(
        &self,
        other: &DataFrame,
        slice: Option<(i64, usize)>,
        parallel: bool
    ) -> Result<(DataFrame, DataFrame), PolarsError> { ... }
    fn cross_join(
        &self,
        other: &DataFrame,
        suffix: Option<&str>,
        slice: Option<(i64, usize)>
    ) -> Result<DataFrame, PolarsError> { ... }
}Available on crate feature 
polars-ops only.