andygrove commented on PR #26311:
URL: https://github.com/apache/datafusion/pull/26311#issuecomment-6172739483

   Filed #26316 as a follow-up. One side effect of this PR worth noting: in 
optimized plans, a struct- or map-typed `CASE ... ELSE NULL` now fails with 
`Unsupported scalar: Struct(...)`, because the unparser can't render NULL 
struct/map literals. Before this PR the ELSE was silently dropped, which 
happened to give the same result. The gap already exists on `main` (`CASE ... 
THEN NULL` fails there today, and NULL list literals unparse as `[]`), so it 
belongs in its own fix rather than in this PR. Not blocking.
   


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