Function open_reader 

pub fn open_reader(
    path: &str,
    schema: &[LogicalType],
) -> Result<Box<dyn DataReader<Item = Result<Vec<TypedValue>, KyuError>>>, KyuError>

Open a data reader for the given file path, auto-detecting format by extension.

Supported extensions: .csv, .tsv, .parquet, .arrow, .ipc.