HaoYang670 opened a new issue, #3368:
URL: https://github.com/apache/arrow-datafusion/issues/3368
**Is your feature request related to a problem or challenge? Please describe
what you are trying to do.**
```rust
/// returns all expressions (non-recursively) in the current
/// logical plan node. This does not include expressions in any
/// children
pub fn expressions(self: &LogicalPlan) -> Vec<Expr> {
```
Currently, the function return a copy of all expressions, I'd like it to
return `&[Expr]` to avoid copying.
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**Describe alternatives you've considered**
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**Additional context**
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