ryzhyk opened a new issue, #14862:
URL: https://github.com/apache/datafusion/issues/14862
### Describe the bug
When datafusion is used in a workspace that enables the `rkyv-64` feature in
the `chrono` crate, this triggers a Rust compilation error:
```
error[E0277]: can't compare `Option<&std::string::String>` with `Option<&mut
std::string::String>`
--> datafusion/expr/src/logical_plan/plan.rs:2872:43
|
2872 | merged.retain(|k, v| input.get(k) == Some(v));
| ^^ no implementation for
`Option<&std::string::String> == Option<&mut std::string::String>`
|
= help: the trait `PartialEq<Option<&mut std::string::String>>` is not
implemented for `Option<&std::string::String>`
= help: the following other types implement trait `PartialEq<Rhs>`:
`Option<T>` implements `PartialEq`
`Option<U>` implements
`PartialEq<rkyv::option::ArchivedOption<T>>`
```
The root cause of the error is incorrect type unification in the Rust
compiler, as explained in https://github.com/rkyv/rkyv/issues/434.
I will submit a PR with a workaround.
### To Reproduce
Change `Cargo.toml` to enable the `rkyv-64` feature in chrono and try
building the `datafusion-expr` crate:
```
chrono = { version = "0.4.38", default-features = false, features =
["rkyv-64"] }
```
### Expected behavior
_No response_
### Additional context
_No response_
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