mapleFU commented on issue #46555:
URL: https://github.com/apache/arrow/issues/46555#issuecomment-2905679475

   It's impressive to use one `buf` during building the variant object!
   
   ```go
   // Builder is used to construct Variant values by appending data of various 
types.
   // It manages an internal buffer for the value data and a dictionary for 
field keys.
   type Builder struct {
        buf             bytes.Buffer
        dict            map[string]uint32
        dictKeys        [][]byte
        allowDuplicates bool
   }
   ```


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