alamb commented on code in PR #10117:
URL: https://github.com/apache/datafusion/pull/10117#discussion_r1598189334
##########
datafusion/physical-expr/src/scalar_function.rs:
##########
@@ -251,10 +251,23 @@ pub fn out_ordering(
func: &FuncMonotonicity,
arg_orderings: &[SortProperties],
) -> SortProperties {
- func.iter().zip(arg_orderings).fold(
+ arg_orderings.iter().enumerate().fold(
SortProperties::Singleton,
- |prev_sort, (item, arg)| {
- let current_sort = func_order_in_one_dimension(item, arg);
+ |prev_sort, (index, arg)| {
+ let arg_monotonicity: Option<bool> = match func {
+ FuncMonotonicity::None => None,
+ FuncMonotonicity::Increasing => Some(true),
+ FuncMonotonicity::Decreasing => Some(false),
+ FuncMonotonicity::Mixed(inner_vec) => {
Review Comment:
Maybe we could add something like
```rust
enum Monotonicity {
Increasing,
Decreasing,
Unknown,
}
```
And then represent `FuncMonotonicity::Mixed` with a `Vec<Monotonicity>`
I would love to get a chance to pla around with it, but may not have time
for a while
##########
datafusion/physical-expr/src/scalar_function.rs:
##########
@@ -251,10 +251,23 @@ pub fn out_ordering(
func: &FuncMonotonicity,
arg_orderings: &[SortProperties],
) -> SortProperties {
- func.iter().zip(arg_orderings).fold(
+ arg_orderings.iter().enumerate().fold(
SortProperties::Singleton,
- |prev_sort, (item, arg)| {
- let current_sort = func_order_in_one_dimension(item, arg);
+ |prev_sort, (index, arg)| {
+ let arg_monotonicity: Option<bool> = match func {
+ FuncMonotonicity::None => None,
+ FuncMonotonicity::Increasing => Some(true),
+ FuncMonotonicity::Decreasing => Some(false),
+ FuncMonotonicity::Mixed(inner_vec) => {
Review Comment:
I agree the conversion feels confusing --
> I do think that the conversion from FuncMonotonicity to Option<bool> is
required in this function.
> I tried a few different ways (without conversion) but it was resulting in
really messy code.
I would be interested in trying to help here as I think the major benefit of
this change is to encapsulate the monotonicity calculations. I'll give it a look
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