viirya commented on issue #9892:
URL:
https://github.com/apache/arrow-datafusion/issues/9892#issuecomment-2030171353
> I think you can do this via one of these functions (I can't link to
rustdocs as 37 hasn't yet been released and the functions are made via macro):
Hmm, I think you mean that `expr_fn` module exports individual scalar
functions. But to get corresponding function from a string of the scalar
function name, we need to write a function like:
```rust
fn string_to_scalar_udf(udf_name: &str) -> Arc<ScalarUDF> {
match udf_name {
"ascii" -> datafusion_functions::string::ascii(),
...
}
}
```
It is doable thought it means we need to maintain a long list of matches,
but I'm also wondering if there is a better built-in solution in DataFusion.
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