kou commented on issue #38837:
URL: https://github.com/apache/arrow/issues/38837#issuecomment-2268597440

   We'll use the following schema based on the mailing list discussion:
   
   ```text
   map<
     // The column index or null if the statistics refer to whole table or 
batch.
     int32,
     // Statistics key is string. Dictionary is used for efficiency.
     // Different keys are assigned for exact value and
     // approximate value.
     map<
       dictionary<int32, utf8>,
       dense_union<...needed types based on stat kinds in the keys...>
     >
   >
   ```


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