Function read_edge_properties 

pub fn read_edge_properties(
    dir: &Path,
    stem: &str,
) -> Result<Vec<RecordBatch>, DataFusionError>

Edge analogue of read_properties: read edge_properties/<stem>.parquet (keyed by edge_uuid), discovering its dynamic schema from the file. Returns an empty Vec when the file is absent.

Errors

Propagates Parquet / Arrow errors encountered while reading.