[LucaCappelletti94]

AlterFunction described an ALTER AGGREGATE signature with a FunctionDesc plus two aggregate-only fields, aggregate_star and aggregate_order_by. That shape allows a * signature that also has arguments, and an argument list of None that the parser never produces.

The next PR in the stack will reuse AggregateSignature for ALTER EXTENSION ... ADD AGGREGATE.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.32%. Comparing base (d66fdf5) to head (69d9328).

Additional details and impacted files

@@                              Coverage Diff                               @@
##           upstream/pg-alter-extension-member-routine    #2949      +/-   ##
==============================================================================
+ Coverage                                       83.28%   83.32%   +0.04%     
==============================================================================
  Files                                              42       42              
  Lines                                           35439    35419      -20     
  Branches                                        35439    35419      -20     
==============================================================================
- Hits                                            29515    29514       -1     
+ Misses                                           2478     2476       -2     
+ Partials                                         3446     3429      -17     

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