buraksenn opened a new pull request, #20963:
URL: https://github.com/apache/datafusion/pull/20963

   ## Which issue does this PR close?
   
   
   - Closes #608.
   
   ## Rationale for this change
   #608 has details but as @alamb describes in 
https://github.com/apache/datafusion/issues/608#issuecomment-4034162591
   ```
   SELECT c2
     FROM test
     ORDER BY max(c3) OVER (ORDER BY c9);
   ```
   
   fails with:
   
   ```
   This feature is not implemented: Physical plan does not support logical 
expression WindowFunction(WindowFunction { fun: AggregateUDF(AggregateUDF { 
inner: Max { signature: Signature { type_signature: UserDefined, volatility: 
Immutable, parameter_names: None } } }), params: WindowFunctionParams { args: 
[Column(Column { relation: Some(Bare { table: "test" }), name: "c3" })], 
partition_by: [], order_by: [Sort { expr: Column(Column { relation: Some(Bare { 
table: "test" }), name: "c9" }), asc: true, nulls_first: false }], 
window_frame: WindowFrame { units: Range, start_bound: Preceding(Int32(NULL)), 
end_bound: CurrentRow, is_causal: false }, filter: None, null_treatment: None, 
distinct: false } })
   ```
   ## What changes are included in this PR?
   - relevant change
   - slt and unit tests
   
   ## Are these changes tested?
   Yes added both unit tests for plan and slt tests for checking output
   
   ## Are there any user-facing changes?
   Additive user changes that users can now use  window in order by expressions


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