andrew-rj opened a new issue, #6879:
URL: https://github.com/apache/arrow-rs/issues/6879
**Is your feature request related to a problem or challenge? Please describe
what you are trying to do.**
I'm trying to have a single struct with optional fields that can be written
and read as parquet. I want to have something like this:
```
#[derive(ParquetRecordWriter, ParquetRecordReader, Default)]
pub(crate) struct TabularIdentifier {
id: u64,
type: String,
maybe_thing: Option<String>,
}
```
This however does not compile. I get a compiler error that looks like this:
```
error: proc-macro derive panicked
--> src/bin/commands/generators/parquet/records.rs:146:31
|
146 | #[derive(ParquetRecordWriter, ParquetRecordReader, Default)]
| ^^^^^^^^^^^^^^^^^^^
|
= help: message: not implemented: Unsupported: Option(
TypePath(
Type::Path {
qself: None,
path: Path {
leading_colon: None,
segments: [
PathSegment {
ident: Ident {
ident: "String",
span: #0 bytes(90325..90331),
},
arguments: PathArguments::None,
},
],
},
},
),
)
```
**Describe the solution you'd like**
It would be really helpful to be able to encode and decode a single struct
that has optional fields via `parquet-derive`.
**Describe alternatives you've considered**
An alternative might be a more manual process that reads out the parquet
data and constructs the struct. That is a fair bit more manual than I would
like.
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