istvan-fodor commented on issue #5494:
URL: https://github.com/apache/arrow-rs/issues/5494#issuecomment-1987397875
Hi @tustvold ,
Is there a way to cast the result to a ListBuilder<StructBuilder> or
ListBuilder<Box<StructBuilder>> ?
I tried this and it fails on the unwrap:
```rust
let mut list_builder_option = struct_builder
.field_builder::<arrow::array::builder::ListBuilder<Box<dyn
arrow::array::ArrayBuilder>>>(
1usize,
)
.unwrap();
let mut list_struct_builder = list_builder_option
.as_any_mut()
.downcast_mut::<arrow::array::builder::ListBuilder<arrow::array::StructBuilder>>()
.unwrap();
}
```
Downcasting with
`<arrow::array::builder::ListBuilder<Box<arrow::array::StructBuilder>>>`
outright fails compilation.
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