Len of two concatenated Bytes objects is 0

[allai5]

import numba
import numpy as np


@numba.njit
def addbytes_len_usecase(a, b):
    output = len(b''.join([a, b]))
    return output

b_val = b"abcd"
addbytes_len_ans = addbytes_len_usecase(b_val, b_val) 
print(f"addbytes_len_ans: {addbytes_len_ans}")

Returns 0.

Reporting a bug

• I have tried using the latest released version of Numba (most recent is
  visible in the change log (https://github.com/numba/numba/blob/main/CHANGE_LOG).
• I have included a self contained code sample to reproduce the problem.
  i.e. it's possible to run as 'python bug.py'.

[njriasan]

So the core of this issue is the types.Bytes being ArrayCompatable. However, this particular issue is related to _make_constant_bytes setting bstr.shape and bstr.strides to null. In case the Bytes refactoring gets delayed I would merge a fix for this now. @allai5 will open a PR.

[esc]

@allai5 @njriasan thank you for bringing this up. I presume #8305 will fix?

[njriasan]

@esc That links back to this issue. Do you mean #8306? If so yes that fixes it. However, this should also be fixed as part of a general Bytes refactoring to remove ArrayCompatible (which I am working on but have only just started).