yukkit commented on code in PR #5559:
URL: https://github.com/apache/arrow-datafusion/pull/5559#discussion_r1138207404
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datafusion/expr/src/utils.rs:
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@@ -69,6 +69,94 @@ pub fn grouping_set_expr_count(group_expr: &[Expr]) ->
Result<usize> {
}
}
+fn powerset<T>(slice: &[T]) -> Vec<Vec<&T>> {
Review Comment:
> Can you please add a docstring explaining what the expected output of this
function is intended to be?
>
> For example, is it https://en.wikipedia.org/wiki/Power_set?
I will add comments to it
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