Write a dataframe to ipc

[gianarb]

    let results = match df.collect().await {
        Ok(e) => e,
        Err(err) => {
        }
    };

I would like write a collection to an ipc writer (end goal is to write it into an http response body), but I can't figure out how to properly get a schema out of it.

# use arrow::ipc::writer::FileWriter as IPCWriterBuilder;

return IPCWriterBuilder::try_new(&mut bytes, df);

this is the error I get

error[E0308]: mismatched types
   --> src/bin/sssql.rs:120:66
    |
120 |                     return IPCWriterBuilder::try_new(&mut bytes, df.schema().to_owned());
    |                            -------------------------             ^^^^^^^^^^^^^^^^^^^^^^ expected `&arrow::datatypes::Schema`, found struct `DFSchema`
    |                            |
    |                            arguments to this function are incorrect

[dependencies]
arrow = "38.0.0"
datafusion = { version ="24.0.0" }
datafusion-common = { version ="24.0.0" }
datafusion-sql = { version ="24.0.0" }
datafusion-expr = { version ="24.0.0" }
object_store = { version = "0.5.6", features = ["aws"] }

[alamb]

I think you need the Arrow schema (not the DFSchema, which is a wrapper)

Maybe something like

let schema = SchemaRef::from(df.schema());
return IPCWriterBuilder::try_new(&mut bytes,&schema);