wiedld opened a new pull request, #14637:
URL: https://github.com/apache/datafusion/pull/14637

   ## Which issue does this PR close?
   
   I'll make a new issue, once we confirm this reproducer is a bug.
   
   ## Rationale for this change
   
   We have physical plans which are failing in the sanity checker. Taking the 
plan as it is when provided to the `EnforceSorting`, it is a valid plan 
(defined "valid" as passing the sanity check). After the `EnforceSorting`, it 
fails due to the removal of the needed coalesce.
   
   I've added a temporary patch to our forked datafusion which adds to [this 
conditional](https://github.com/apache/datafusion/blob/2d303346c7d44a78d317e7b7b959cbd94edfb891/datafusion/physical-optimizer/src/enforce_sorting/mod.rs#L526),
 in order to prevent the removal of the coalesce. However, I'm unclear whether 
an actual fix should be the replacement of the coalesce with an SPM _at the 
correct location_ (instead of placing the SPM after the aggregate, which no 
longer fulfills the distribution requirements).
   
   
   ## What changes are included in this PR?
   
   Demonstrate the bug.
   
   ## Are these changes tested?
   
   
   
   ## Are there any user-facing changes?
   
   
   


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