duongcongtoai commented on PR #17110:
URL: https://github.com/apache/datafusion/pull/17110#issuecomment-3226655728
duckdb has a notion of `PropagatesNullValues`, i wonder if we have some
thing similar
```
impl ExprSchemable for Expr {
fn nullable(&self, input_schema: &dyn ExprSchema) -> Result<bool> {
```
we have something like this, but they are quite different i believe
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