Function polars_lazy::dsl::map_binary_lazy_field

pub fn map_binary_lazy_field<F: 'static, Fld: 'static>(
    a: Expr, 
    b: Expr, 
    f: F, 
    output_field: Fld
) -> Expr where
    F: Fn(Series, Series) -> Result<Series> + Send + Sync,
    Fld: Fn(&Schema, Context, &Field, &Field) -> Option<Field> + Send + Sync, 

This is supported on crate feature compile only.

Binary function where the output type is determined at runtime when the schema is known.