findepi commented on PR #16625:
URL: https://github.com/apache/datafusion/pull/16625#issuecomment-3114360847
> What I think I am confused about is what is the practical difference
between `HardRequirement` and `SoftRequiement` -- specifically, what different
plan / decision will be made.
>
> I believe the result is that DataFusion will attempt to sort the input
according to the requirement, but if it can not (because it will cause a
conflict with another aggregate function's requirements, for example) then the
aggregate can still be run with the different ordering
- HardRequirement -- if the input sort requirement is not satisfied, then
query planning errors. This is the case when aggregate functions want the input
to be sorted, but lack sorting capability if it is not.
- ideally this should never happen. We might want to work towards removing
HardRequirement in the future.
- SoftRequiement -- if the input is sorted, great, if it's not, also fine
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