Omega359 commented on issue #13631:
URL: https://github.com/apache/datafusion/issues/13631#issuecomment-2659449432
I did a quick test using
cargo fix --edition and there are a lot of concerns with drop ordering and
if let scoping:
```
warning: `if let` assigns a shorter lifetime since Edition 2024
--> datafusion/common/src/scalar/mod.rs:1861:28
|
1861 | if let ScalarValue::$SCALAR_TY(v) = sv {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^--
| |
| this
value has a significant drop implementation which may observe a major change in
drop order and requires your discretion
...
1937 | DataType::Int32 => build_array_primitive!(Int32Array,
Int32),
|
----------------------------------------- in this macro invocation
|
= warning: this changes meaning in Rust 2024
= note: for more information, see
<https://doc.rust-lang.org/nightly/edition-guide/rust-2024/temporary-if-let-scope.html>
```
```
warning: relative drop order changing in Rust 2024
--> datafusion/expr/src/utils.rs:1144:32
|
1144 | while let Some(expr) = stack.pop() {
| ---- ^^^^^^^^^^^
| | |
| | this value will be stored in a
temporary; let us call it `#2`
| | up until Edition 2021 `#2` is dropped
last but will be dropped earlier in Edition 2024
| `expr` calls a custom destructor
| `expr` will be dropped later as of Edition 2024
...
1147 | right,
| -----
| |
| `right` calls a custom destructor
| `right` will be dropped later as of Edition 2024
1148 | op: Operator::And,
1149 | left,
| ----
| |
| `left` calls a custom destructor
| `left` will be dropped later as of Edition 2024
...
1154 | Expr::Alias(Alias { expr, .. }) => stack.push(*expr),
| ----
| |
| this value will be stored in a
temporary; let us call it `#1`
| `#1` will be dropped later as of
Edition 2024
...
1157 | }
| - now the temporary value is dropped here, before the local
variables in the block or statement
```
It's not going to be a quick migration. 2024 also required <= 1.85.0 so
Datafusion couldn't use it until 1.89.0 is released according to the MSRV
policy.
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