kou commented on PR #39826:
URL: https://github.com/apache/arrow/pull/39826#issuecomment-1915550940

   `alice` is not an error.
   The example shows that all child values are ignored when struct's validity 
bitmap is `0`. In this case, the 3rd element is `0` in struct's validity 
bitmap. So `['joe', null, 'alice', 'mark'][2]` and `[1, 2, null, 4][2]` are 
ignored.


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