telemenar commented on PR #1062:
URL: https://github.com/apache/arrow-java/pull/1062#issuecomment-4027837787

   > Can you explain how these are useful?
   
   Arrow's type system has many types, and projects building operations across 
Arrow data (comparisons, casts, aggregations) benefit from generating 
type-specialized code rather than hand-writing implementations for each type.
   
   The TDD files provide a machine-readable definition of Arrow's types that 
enables this. Including them in the distribution allows downstream projects to 
generate code that stays in sync as Arrow's type system evolves.


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