pepijnve commented on code in PR #17813:
URL: https://github.com/apache/datafusion/pull/17813#discussion_r2545997112
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datafusion/expr/src/expr_schema.rs:
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@@ -282,14 +284,80 @@ impl ExprSchemable for Expr {
Expr::OuterReferenceColumn(field, _) => Ok(field.is_nullable()),
Expr::Literal(value, _) => Ok(value.is_null()),
Expr::Case(case) => {
Review Comment:
I started looking at the possible options here already a bit. I think we're
going to need a variant of `ExprSchemable` that's not intended to be the `Expr`
itself. This would at least allow something like `SimplifyInfo` to memoize
results.
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