crepererum opened a new pull request, #3148:
URL: https://github.com/apache/arrow-rs/pull/3148

   # Which issue does this PR close?
   
   Closes #2262.
   
   # Rationale for this change
   Consistent metadata types, smaller memory footprint, easier size 
calculations (see #3147).
   
   # What changes are included in this PR?
   `Field::metadata` is now a `HashMap` instead of a `BTreeMap`.
   
   # Are there any user-facing changes?
   
   **:warning: Breaking Change:** Type changed. Iteration order is now 
undefined.


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