[I] [C#] Inconsistent String Comparisons in Schema Field Retrieval Methods [arrow]

[via GitHub]

vthemelis opened a new issue, #44650:
URL: https://github.com/apache/arrow/issues/44650

   ### Describe the bug, including details regarding any error messages, 
version, and platform.
   
   In the Schema class, there are three methods used to retrieve individual 
fields:
   
   ```csharp
   public class Schema
   {
       // ...
   
       public Field GetFieldByName(string name) => 
FieldsLookup[name].FirstOrDefault();
   
       public int GetFieldIndex(string name, StringComparer comparer)
       {
           IEqualityComparer<string> equalityComparer = 
(IEqualityComparer<string>)comparer;
           return GetFieldIndex(name, equalityComparer);
       }
   
       public int GetFieldIndex(string name, IEqualityComparer<string> comparer 
= default)
       {
           // Implementation using the specified comparer
       }
   }
   ```
   
   The first method (GetFieldByName) use the default string comparer, while the 
latter two (GetFieldIndex overloads) allow specifying a custom StringComparer 
or IEqualityComparer<string>. This inconsistency can be confusing, as it is 
unclear when custom comparers are utilized.
   
   ### Component(s)
   
   C#


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