irenjj commented on PR #17110:
URL: https://github.com/apache/datafusion/pull/17110#issuecomment-3230232039
> 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
We can follow the main function in duckdb:
```cpp
bool Expression::PropagatesNullValues() const {
if (type == ExpressionType::OPERATOR_IS_NULL || type ==
ExpressionType::OPERATOR_IS_NOT_NULL ||
type == ExpressionType::COMPARE_NOT_DISTINCT_FROM || type ==
ExpressionType::COMPARE_DISTINCT_FROM ||
type == ExpressionType::CONJUNCTION_OR || type ==
ExpressionType::CONJUNCTION_AND ||
type == ExpressionType::OPERATOR_COALESCE || type ==
ExpressionType::CASE_EXPR) {
return false;
}
bool propagate_null_values = true;
ExpressionIterator::EnumerateChildren(*this, [&](const Expression
&child) {
if (!child.PropagatesNullValues()) {
propagate_null_values = false;
}
});
return propagate_null_values;
}
``
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