Serializing arrow-schema objects

[mlilback]

I'm trying to convert a Schema to json. All the structs I've looked at are annotated with

#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]

However, there is no "serde" feature I can enable for the arrow crate. How do I enable this feature?

Here is the error I'm getting:

48   |             let json = serde_json::to_string(&schema).unwrap();
     |                        --------------------- ^^^^^^^ the trait `serde::ser::Serialize` is not implemented for `arrow_schema::schema::Schema`
     |                        |
     |                        required by a bound introduced by this call

I can see at that at one point there was no such cfg_attr, but looking through the history I can't find when or why this change was made.

[tustvold]

Arrow-schema has an optional serde dependency - https://crates.io/crates/arrow-schema/34.0.0/dependencies

If you add features = ["serde"] it should work

[mlilback]

I didn't realize you could directly import arrow-schema, I thought you had to import arrow.

Thanks

[tustvold]

Yeah, see #2594