istvan-fodor opened a new issue, #5494:
URL: https://github.com/apache/arrow-rs/issues/5494
Hi All,
As per @alamb 's advice, I am cross posting my question from Discord.
I have a question about how to use ListBuilders with StructBuilders.
I am building an array that has a column with a list type. There are structs
in the list. When I create a builder for the column, I am unable to append to
it. Whenever I try to get a field builder for the structs, I am unable to do
so.
I debugged through StructBuilder::make_builder and seems like everything is
correctly created (List builder with StructBuilder type). I am attaching a
small snippet that reproduces my issue. Any advice is very much appreciated!
Thanks!
Here is an example code to reproduce my issue:
```rust
use arrow::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<arrow::array::StructBuilder>>(1usize)
.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),
]
}
```
The line `let mut list_builder_option =
struct_builder.field_builder::<arrow::array::builder::ListBuilder<arrow::array::StructBuilder>>(1usize).unwrap();`
panics. I expected it to to return a builder where I can start adding the
struct fields.
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