[jira] [Created] (ARROW-10996) [Rust] Return error messages via Result for get_arrow_schema_from_metadata

["Andrew Lamb (Jira)" <ji...@apache.org>]

Andrew Lamb created ARROW-10996:
-----------------------------------

             Summary: [Rust] Return error messages via Result for get_arrow_schema_from_metadata
                 Key: ARROW-10996
                 URL: https://issues.apache.org/jira/browse/ARROW-10996
             Project: Apache Arrow
          Issue Type: Bug
          Components: Rust
            Reporter: Andrew Lamb


While converting from the parquet schema to arrow schema some errors, including those during flatbuffer decoding, can be lost. 

This is due to get_arrow_schema_from_metadata returning `Option` rather than `Result`

https://github.com/apache/arrow/pull/8936/files# improved the situation by printing the error to stdout, so the error isn't entirely lost, but this message should be propagated up the call chain as a proper Rust error via a Result. 

{code}
            match arrow::ipc::root_as_message(slice) {
                Ok(message) => message
                    .header_as_schema()
                    .map(arrow::ipc::convert::fb_to_schema),
                Err(err) => {
                    // The flatbuffers implementation returns an error on verification error.
                    // TODO: return error to caller?
                    eprintln!(
                        "Unable to get root as message stored in {}: {:?}",
                        super::ARROW_SCHEMA_META_KEY,
                        err
                    );
                    None
                }
            }
{code}



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