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### Describe the bug
There is `SimilarTo` expr in logical expr
https://github.com/apache/datafusion/blob/23ccca9cd9bdf1791985f2b4abb6d5d8a4fc5ece/datafusion/expr/src/expr.rs#L241
However, there is …
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# Problem
While I was working on https://github.com/vega/altair/pull/3544, I tried out re-writing some expression strings to use `alt.expr`.
This idea stems from what I saw as a poor UX - that has…
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### Description
`expr.name.map` takes a function `(str) -> str`. This means if the user has a function that takes a string `Expr` and returns a new one, they can't use it with `expr.name.map`. For …
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### Is your feature request related to a problem or challenge?
In [DataFusion Comet](https://github.com/apache/datafusion-comet), we have a custom `IfExpr` for `IF(condition, true_expr, false_expr)…
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Its not possible to easily tell “did they pass an expression”. You can use `Ash.Expr.expr?` but that literally traverses the entire value.
I *think* we can actually change this transparently to end u…
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**Describe the bug**
If I want to give `nix run` a Nix expression and run the `meta.mainProgram` of it, and supply arguments to that command, it fails. On the other hand, using `nix shell --command…
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**Use Case**
**Describe the solution you'd like**
**Describe alternatives you've considered**
**Additional context**
---
**Use Case**
**Describe the solution you'd like**
…
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### Checks
- [X] I have checked that this issue has not already been reported.
- [X] I have confirmed this bug exists on the [latest version](https://pypi.org/project/polars/) of Polars.
### Reprodu…
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**Describe the project you are working on:**
A game
**Describe the problem or limitation you are having in your project:**
When I want to create `onready` variables for nested nodes, I have to re…
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I tried this code:
```rust
fn main() {
#[kani::proof]
matches!(1, 1) || true
}
```
using the following command line invocation:
```
kani file.rs
```
with Kani vers…