shoemoney commented on PR #51000:
URL: https://github.com/apache/arrow/pull/51000#issuecomment-5500679913

   Thanks for the look. On (1), agreed — I'll open a separate issue and retitle 
against it. On (2), no: the current patch only skips null index slots, so a 
null dictionary *value* referenced by a valid index still gets dereferenced, 
which is the gap you're pointing at. Your `is_null(dictionary)` → `take` → 
`BitmapOrNot` approach handles both cases in one pass and is simpler than what 
I have, so I'd rather switch to it than extend the current loop — I'll do that 
in this PR unless you or @zanmato1984 would prefer it start fresh.
   


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