pitrou opened a new pull request #12690:
URL: https://github.com/apache/arrow/pull/12690


   AdaptiveIntBuilder (and AdaptiveUIntBuilder) would crash when asked to 
append 0 nulls to a 0-length builder.
   
   Also fixes the following PyArrow crash:
   ```python
   pa.array([None], pa.list_(pa.dictionary(pa.int32(), pa.string()), 0))
   ```


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