Function decode_fixed 

unsafe fn decode_fixed<T: FixedLengthEncoding + ArrowNativeType>(
    rows: &mut [&[u8]],
    data_type: DataType,
    options: SortOptions,
) -> ArrayData

Decodes a ArrayData from rows based on the provided FixedLengthEncoding T

Safety

data_type must be appropriate native type for T