polars_utils/select.rs
#[cfg(feature = "nightly")]
pub fn select_unpredictable<T>(cond: bool, true_val: T, false_val: T) -> T {
cond.select_unpredictable(true_val, false_val)
}
#[cfg(not(feature = "nightly"))]
pub fn select_unpredictable<T>(cond: bool, true_val: T, false_val: T) -> T {
if cond {
true_val
} else {
false_val
}
}