Comment from Andy Grove(andygrove) @ 2020-10-06T04:18:16.429+0000:

I was able to run the DataFusion examples though, despite these test failures.

Comment from Andy Grove(andygrove) @ 2020-10-06T14:36:18.391+0000:

If these tests really are specific to 64 bit platforms then we could use conditional compilation and only compile them when target_pointer_width == 64.

See [https://doc.rust-lang.org/reference/conditional-compilation.html#target_pointer_width] for more information.

Comment from Andy Grove(andygrove) @ 2020-10-06T14:37:10.663+0000:

[~nevi_me] [~vertexclique] I'd be interested in your opinions on this one.

Comment from Mahmut Bulut(vertexclique) @ 2020-10-06T14:42:40.349+0000:

[~andygrove] Hi Andy, I don't have raspberry pi at hand. I want to check the compilation problems on ARM asap, target_pointer_width gate might be a good option for it. What version of rpi did you use?

Comment from Neville Dipale(nevi_me) @ 2020-10-16T04:08:01.196+0000:

[~andygrove] 64-bit types and offsets would also be a blocker for supporting wasm32.

If someone completes ARROW-9453, perhaps we can gauge from that on what effort it takes to support 32-bit.

An update on this. We still have some failures on 32 bit Rasp Pi.

---- array::array_primitive::tests::test_primitive_array_from_vec_option stdout ----
thread 'array::array_primitive::tests::test_primitive_array_from_vec_option' panicked at 'assertion failed: `(left == right)`
  left: `216`,
 right: `172`', arrow/src/array/array_primitive.rs:533:9

---- array::array_primitive::tests::test_primitive_array_from_vec stdout ----
thread 'array::array_primitive::tests::test_primitive_array_from_vec' panicked at 'assertion failed: `(left == right)`
  left: `136`,
 right: `100`', arrow/src/array/array_primitive.rs:511:9

---- array::array_primitive::tests::test_timestamp_fmt_debug stdout ----
thread 'array::array_primitive::tests::test_timestamp_fmt_debug' panicked at 'called `Option::unwrap()` on a `None` value', arrow/src/array/array_primitive.rs:286:54

Environment (Rasperry Pi 4 Model B):

Raspbian GNU/Linux 10
Linux raspberrypi 4.19.97-v7l+ #1294 SMP Thu Jan 30 13:21:14 GMT 2020 armv7l GNU/Linux
rustc 1.51.0 (2fd73fabe 2021-03-23)

Amazingly, this issue is reproducible on any computer using Docker and cross. Make sure you have the Docker daemon running, then run:

cargo install cross
cross build --target armv7-unknown-linux-gnueabihf
cross test --target armv7-unknown-linux-gnueabihf