GitHub user surister closed a discussion: How to append a `String` or `bool` to
`UnionBuilder`?
```rust
let mut builder = UnionBuilder::new_dense();
builder.append::<Int32Type>("a", 1).unwrap();
builder.append::<Float64Type>("b", 3.0).unwrap();
builder.append::<Int32Type>("a", 4).unwrap();
builder.append::<?>("c", "some_string".to_string()).unwrap();
^
```
What DataType do I specify, couldn't find anything suitable that implements
`ArrowPrimitiveType`, or what is the right idiom?
GitHub link: https://github.com/apache/arrow-rs/discussions/6446
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