crepererum opened a new pull request, #6129:
URL: https://github.com/apache/arrow-datafusion/pull/6129

   # Which issue does this PR close?
   Fixes #6116.
   
   # Rationale for this change
   `common_subexpr_eliminate` MUST NOT push aggregate functions into the 
`LogicalPlan::Aggregate` child.
   
   # What changes are included in this PR?
   Fixed and improved logic for aggregates.
   
   # Are these changes tested?
   - existing tests pass (modulo `aggregate`)
   - fixed and extended `aggregate` test
   
   # Are there any user-facing changes?
   Probably no changes for SQL users. This mostly affects Rust API users that 
manually construct logical plans (e.g. for other query languages).


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