istvan-fodor commented on issue #5494:
URL: https://github.com/apache/arrow-rs/issues/5494#issuecomment-1987449478
@tustvold @alamb I was able to get this to work with the following code.
Took the Box<any ArrayBuilder> and downcasted it.
```rust
use arrow::{
array::{ArrayBuilder, StructBuilder},
datatypes::{DataType, Field, Fields},
};
use std::sync::Arc;
fn main() {
let mut status = arrow::array::builder::ListBuilder::new(
arrow::array::StructBuilder::from_fields(status_schema(), 0),
);
let mut struct_builder: &mut arrow::array::StructBuilder =
status.values();
let mut list_builder_option = struct_builder
.field_builder::<arrow::array::builder::ListBuilder<Box<dyn
arrow::array::ArrayBuilder>>>(
1usize,
);
let mut struct_builder = list_builder_option.as_mut().unwrap();
let mut struct_builder: &mut arrow::array::StructBuilder = struct_builder
.values()
.as_any_mut()
.downcast_mut::<StructBuilder>()
.unwrap();
}
pub fn status_schema() -> Vec<Field> {
vec![
Field::new("id", DataType::Utf8, true),
Field::new(
"values",
DataType::List(Arc::new(Field::new(
"item",
DataType::Struct(Fields::from(key_value_schema())),
true,
))),
true,
),
]
}
pub fn key_value_schema() -> Vec<Field> {
vec![
Field::new("key", DataType::Utf8, true),
Field::new("value", DataType::Utf8, true),
]
}
```
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