[GitHub] [arrow] wjones127 opened a new issue, #36648: [C++] Provide way for extension array to provide it's own value pretty printer

["wjones127 (via GitHub)" <gi...@apache.org>]

wjones127 opened a new issue, #36648:
URL: https://github.com/apache/arrow/issues/36648

   ### Describe the enhancement requested
   
   We are looking at implementing BFloat16 data type as an extension type based on a FSB[2] storage type. In Python we can write the repr method for the array, but ChunkedArray and Table will print the storage type, which looks like nonsense to users:
   
   ```python
   >>> tab = pa.table({ "x": bfloat16_array([1.1, None, 3.4]) })
   >>> tab
   pyarrow.Table
   x: extension<lance.bfloat16<BFloat16Type>>
   ----
   x: [[8D3F,null,5A40]]
   >>> tab['x']
   <pyarrow.lib.ChunkedArray object at 0x12a1f3a60>
   [
     [
       8D3F,
       null,
       5A40
     ]
   ]
   >>> tab['x'].chunk(0)
   <lance.arrow.BFloat16Array object at 0x0000000129818a60>
   [1.1015625, None, 3.40625]
   ```
   
   https://github.com/lancedb/lance/pull/1002
   
   ### Component(s)
   
   C++


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