[LucaCappelletti94]

FUNCTION items in operator classes and operator families share one private formatter for optional operator types and function arguments.

Addresses the function-item formatting duplication tracked in #2698.

Another echoes find.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 86.20690% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.24%. Comparing base (72ce6a8) to head (a8e2975).

Files with missing lines	Patch %	Lines
src/ast/ddl.rs	86.20%	0 Missing and 4 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2721      +/-   ##
==========================================
+ Coverage   82.22%   82.24%   +0.02%     
==========================================
  Files          42       42              
  Lines       35343    35354      +11     
  Branches    35343    35354      +11     
==========================================
+ Hits        29060    29077      +17     
+ Misses       2716     2714       -2     
+ Partials     3567     3563       -4     

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[LucaCappelletti94]

cc @alamb merging this echo also