alamb commented on PR #17813:
URL: https://github.com/apache/datafusion/pull/17813#issuecomment-3508478441
@pepijnve have you already tried (just) special casing nullability reporting
in case expressions like
```sql
CASE
WHEN <x> IS NOT NULL THEN <x>
WHEN <y> IS NOT NULL THEN <y>
ELSE <z>
```
To be the nullability of `z`?
(this is basically a special case for the pattern created by the `coalesce`
simplification
Please forgive me if you have already tried this, I can't remember the
entire history
I realize this PR is the same idea but implements a more general case of it
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