rok opened a new pull request, #39360:
URL: https://github.com/apache/arrow/pull/39360

   ### Rationale for this change
   
   When defining `StructArray`'s field builders we don't reserve memory and 
then use unsafe append. This causes the resulting array to be at most 32 rows 
long.
   
   ### What changes are included in this PR?
   
   This introduces required memory pre-allocation.
   
   ### Are these changes tested?
   
   Not yet.
   
   ### Are there any user-facing changes?
   
   This fixes the behavior of `iso_calendar` kernel.


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