Function validate_read_fields

crates/paimon/src/arrow/format/blob.rs:113–139

(read_fields: &[DataField])

}

fn validate_read_fields(read_fields: &[DataField]) -> crate::Result<()> {
    if read_fields.len() > 1 {
        return Err(Error::DataInvalid {
            message: format!(
                ".blob format only supports reading at most one projected column, got {}",
                read_fields.len()
            ),
            source: None,
        });
    }

    if let Some(field) = read_fields.first() {
        match field.data_type() {
            DataType::Blob(_) => Ok(()),
            other => Err(Error::DataInvalid {
                message: format!(
                    ".blob format requires a Blob field, got {:?} for column '{}'",
                    other,
                    field.name()
                ),
                source: None,
            }),
        }?;
    }

    Ok(())
}

fn build_descriptor_batch(
    blob_index: &BlobFileIndex,