j-a-m-l opened a new issue #1173:
URL: https://github.com/apache/arrow-datafusion/issues/1173
**Describe the bug**
The `unary_scalar_expr` macro is used on functions that require several
arguments, so those functions fail always.
**To Reproduce**
```rust
df.select(vec![
replace(&[col("number"), lit(","), lit(".")])
])
```
It fails with:
```
expected enum `Expr`, found `&[Expr; 3]`
```
**Expected behavior**
I'd expect that those functions work correctly.
**Additional context**
That macro also adds this comment: `this scalar function is not documented
yet`.
**Proposal**
I'd create a new macro for functions that could receive several arguments.
Ideally that macro would reuse the comment of the "real" function, but that
would be very involved probably.
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