jayzhan211 commented on issue #9637:
URL:
https://github.com/apache/arrow-datafusion/issues/9637#issuecomment-2002012945
I have two idea before deep diving to the code
1. rewrite to have owned LogicalPlan then we can have owned expression
easily.
2. lazy clone on rewrite, the spirit similar to copy on write. The idea from
simplify() #9304 may help here too
```rust
enum SimpliedExpr {
Simplified(Expr)
Original
}
fn simply_expr(&self, expr: &Expr) -> SimpliedExpr
```
if expr is Original, we can avoid clone.
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