0xderek commented on issue #44353:
URL: https://github.com/apache/arrow/issues/44353#issuecomment-2408505089

   Some updates:
   
   The demo code works after changing `.map()` calls to `.map(boolean 
keySorted)`. 
   
   It turns out `UnionMapWriter` doesn't override `map()` and falls back to 
implementation in `UnionListWriter`. I think this is a bug.


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