pepijnve commented on issue #17801:
URL: https://github.com/apache/datafusion/issues/17801#issuecomment-3342798615
To confirm my hunch I hacked together a quick check that I added to the
expression simplifier and that confirms
```
if transformed.transformed {
let is_nullable = self.info.nullable(&transformed.data)?;
if is_nullable != was_nullable {
return plan_err!(
"Nullability changed from {} to {} when simplifying {} to {}",
was_nullable,
is_nullable,
original,
transformed.data
);
}
}
```
results in
```
Error: Context("Optimizer rule 'simplify_expressions' failed",
Plan("Nullability changed from false to true when simplifying
coalesce(CAST(catalog_returns.cr_return_quantity AS Int64), Int64(0)) to CASE
WHEN CAST(catalog_returns.cr_return_quantity AS Int64) IS NOT NULL THEN
CAST(catalog_returns.cr_return_quantity AS Int64) ELSE Int64(0) END"))
```
Is that supposed to be allowed? In other words, should the simplifier be
handling this case or not?
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