alamb commented on code in PR #6799:
URL: https://github.com/apache/arrow-datafusion/pull/6799#discussion_r1246980465
##########
datafusion/expr/src/expr_schema.rs:
##########
@@ -173,8 +173,30 @@ impl ExprSchemable for Expr {
Expr::Alias(expr, _)
| Expr::Not(expr)
| Expr::Negative(expr)
- | Expr::Sort(Sort { expr, .. })
- | Expr::InList(InList { expr, .. }) => expr.nullable(input_schema),
+ | Expr::Sort(Sort { expr, .. }) => expr.nullable(input_schema),
+
+ Expr::InList(InList { expr, list, .. }) => {
+ // Avoid inspecting too many expressions.
+ const MAX_INSPECT_LIMIT: usize = 6;
+ // Stop if a nullable expression is found or an error occurs.
+ let has_nullable = std::iter::once(expr.as_ref())
+ .chain(list)
+ .take(MAX_INSPECT_LIMIT)
+ .find_map(|e| {
+ e.nullable(input_schema)
+ .map(|x| if x { Some(()) } else { None })
Review Comment:
nit: I think calling this `nullable` would make the code easer to read:
```suggestion
.map(|nullable| if nullable { Some(()) } else {
None })
```
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