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Codegen'd Rust/Arrow (de)ser 5: doc, definitions and regression tests for combinatorial affixes #2546

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merged 10 commits into from
Jun 30, 2023
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Codegen'd Rust/Arrow (de)ser 5: doc, definitions and regression tests for combinatorial affixes #2546

merged 10 commits into from
Jun 30, 2023

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@teh-cmc teh-cmc commented Jun 28, 2023 •
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Best reviewed on a commit-by-commit basis; in particular the rerun codegen commit is nothing but generated code.

This PR documents what we call "affixes", why they're problematic when contributing to the codegen stack and why we need to have regression tests in place for them.

Quoting the newly added doc:

Understanding the subtleties of affixes

So-called "affixes" are effects applied to objects defined with the Rerun IDL and that affect
the way these objects behave and interoperate with each other (so, yes, monads. shhh.).

There are 3 distinct and very common affixes used when working with Rerun's IDL: transparency,
nullability and plurality.

Broadly, we can describe these affixes as follows:

  • Transparency allows for bypassing a single layer of typing (e.g. to "extract" a field out of
    a struct).
  • Nullability specifies whether a piece of data is allowed to be left unspecified at runtime.
  • Plurality specifies whether a piece of data is actually a collection of that same type.

We say "broadly" here because the way these affixes ultimately affect objects in practice will
actually depend on the kind of object that they are applied to, of which there are 3: archetypes,
components and datatypes.

Not only that, but objects defined in Rerun's IDL are materialized into 3 distinct environments:
IDL definitions, Arrow datatypes and native code (e.g. Rust & Python).

These environment have vastly different characteristics, quirks, pitfalls and limitations,
which once again lead to these affixes having different, sometimes surprising behavior
depending on the environment we're interested in.
Also keep in mind that Flatbuffers and native code are generally designed around arrays of
structures, while Arrow is all about structures of arrays!

All in all, these interactions between affixes, object kinds and environments lead to a
combinatorial explosion of edge cases that can be very confusing when it comes to (de)serialization
code, and even API design.

When in doubt, check out the rerun.testing.archetypes.AffixFuzzer IDL definitions, generated code and
test suites for definitive answers.

At the moment, the test suite merely checks that the native objects that are generated make sense.
Serialization roundtrips will be added in a couple PRs.
It also only focuses on the Rust backend, as I'm still unsure what complex, deeply nested objects are gonna look like in the Python backend (need to work on #2390 first to get a feel for it).

Also note that, for now, test-archetypes are mixed in with all other user-facing archetypes, which is not ideal.
We'll work towards something better as the dust settle, as for now the overall organization of things is still a moving target (#2537).

PR Build Summary: https://build.rerun.io/pr/2487

Docs preview: https://rerun.io/preview/46068dd/docs
Examples preview: https://rerun.io/preview/46068dd/examples

This was referenced Jun 28, 2023
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teh-cmc added a commit that referenced this pull request Jun 30, 2023
@teh-cmc
Codegen'd Rust/Arrow (de)ser 3: misc fixes & improvements (#2487)
e6354f0 
**Best reviewed on a commit-by-commit basis; in particular the `rerun
codegen` commit is nothing but generated code.**

This PR implements miscellaneous fixes and improvements to the semantic
pass and arrow registry that came up when implementing (de)serialization
routines for the Rust SDK.

---

- #2484
- #2485 
- #2487 
- #2545
- #2546
- #2549
- #2554
- #2570
- #2571

---

<!-- This line will get updated when the PR build summary job finishes.
-->
PR Build Summary: https://build.rerun.io/pr/2487

<!-- pr-link-docs:start -->
Docs preview: https://rerun.io/preview/8976c19/docs
Examples preview: https://rerun.io/preview/8976c19/examples
<!-- pr-link-docs:end -->
@teh-cmc teh-cmc force-pushed the cmc/hope_rust_serde_4/enable_ci_checks branch from 4200af1 to 80fb550 Compare June 30, 2023 13:18
Base automatically changed from cmc/hope_rust_serde_4/enable_ci_checks to main June 30, 2023 13:18
teh-cmc added a commit that referenced this pull request Jun 30, 2023
@teh-cmc
Codegen'd Rust/Arrow (de)ser 4: out-of-sync definitions CI detection (#…
6394edf 
…2545)

Enables detection of out-of-sync fbs definitions on the CI now that
things are stable enough.

---

- #2484
- #2485 
- #2487 
- #2545
- #2546
- #2549
- #2554
- #2570
- #2571

---

<!-- This line will get updated when the PR build summary job finishes.
-->
PR Build Summary: https://build.rerun.io/pr/2487

<!-- pr-link-docs:start -->
Docs preview: https://rerun.io/preview/4200af1/docs
Examples preview: https://rerun.io/preview/4200af1/examples
<!-- pr-link-docs:end -->
@teh-cmc teh-cmc force-pushed the cmc/hope_rust_serde_5/affixes branch from 46068dd to 1ca7660 Compare June 30, 2023 13:21
@teh-cmc teh-cmc merged commit 2e18cc1 into main Jun 30, 2023
@teh-cmc teh-cmc deleted the cmc/hope_rust_serde_5/affixes branch June 30, 2023 13:21
teh-cmc added a commit that referenced this pull request Jun 30, 2023
@teh-cmc
Codegen'd Rust/Arrow (de)ser 6: serialization (#2549)
b45a5bf 
**Best reviewed on a commit-by-commit basis; in particular the `rerun
codegen` commit is nothing but generated code.**

Implements serialization for the Rust codegen backend.

---

- #2484
- #2485 
- #2487 
- #2545
- #2546
- #2549
- #2554
- #2570
- #2571

---

<!-- This line will get updated when the PR build summary job finishes.
-->
PR Build Summary: https://build.rerun.io/pr/2487

<!-- pr-link-docs:start -->
Docs preview: https://rerun.io/preview/87ca70a/docs
Examples preview: https://rerun.io/preview/87ca70a/examples
<!-- pr-link-docs:end -->
teh-cmc added a commit that referenced this pull request Jun 30, 2023
@teh-cmc
Codegen'd Rust/Arrow (de)ser 7: deserialization (#2554)
de97832 
**Best reviewed on a commit-by-commit basis; in particular the `rerun
codegen` commit is nothing but generated code.**

Implements deserialization for the Rust codegen backend.

---

- #2484
- #2485 
- #2487 
- #2545
- #2546
- #2549
- #2554
- #2570
- #2571

---

<!-- This line will get updated when the PR build summary job finishes.
-->
PR Build Summary: https://build.rerun.io/pr/2487

<!-- pr-link-docs:start -->
Docs preview: https://rerun.io/preview/303b165/docs
Examples preview: https://rerun.io/preview/303b165/examples
<!-- pr-link-docs:end -->
teh-cmc added a commit that referenced this pull request Jun 30, 2023
@teh-cmc
Codegen'd Rust/Arrow (de)ser 8: carry extension metadata across trans…
9492e87 
…parency layers (#2570)

**Best reviewed on a commit-by-commit basis; in particular the `rerun
codegen` commit is nothing but generated code.**

This PR makes it so that arrow extension metadata doesn't get lost
across transparency layers, and adds regression tests to make sure this
doesn't happen again.

It also introduce simple codegen optimizations that greatly reduce the
size of the output code (yay wasm!).

This is Rust only for now, we need things to stabilize on the Python
side before we can apply the same kind of logic and tests.

---

- #2484
- #2485 
- #2487 
- #2545
- #2546
- #2549
- #2554
- #2570
- #2571

---

### Checklist
* [x] I have read and agree to [Contributor
Guide](https://github.com/rerun-io/rerun/blob/main/CONTRIBUTING.md) and
the [Code of
Conduct](https://github.com/rerun-io/rerun/blob/main/CODE_OF_CONDUCT.md)
* [x] I've included a screenshot or gif (if applicable)
* [x] I have tested [demo.rerun.io](https://demo.rerun.io/pr/{{
pr.number }}) (if applicable)

- [PR Build Summary](https://build.rerun.io/pr/{{ pr.number }})
- [Docs preview](https://rerun.io/preview/{{
"pr:%s"|format(pr.branch)|encode_uri_component }}/docs)
- [Examples preview](https://rerun.io/preview/{{
"pr:%s"|format(pr.branch)|encode_uri_component }}/examples)
teh-cmc added a commit that referenced this pull request Jul 3, 2023
@teh-cmc
Codegen'd Rust/Arrow (de)ser 9: Rust backport! (#2571)
9f883fa 
**Best reviewed on a commit-by-commit basis; in particular the `rerun
codegen` commit is nothing but generated code.**

You can now use archetypes with the existing SDK:
```rust
    use rerun::experimental::archetypes::Points2D;
    MsgSender::from_archetype(
        "2d_layering/points_between_top_and_middle",
        &Points2D::new(
            (0..256).map(|i| (32.0 + (i / 16) as f32 * 16.0, 64.0 + (i % 16) as f32 * 16.0)),
        )
        .with_draw_order(1.51),
    )?
    .send(rec_stream)?;
```

Closes #2387 

---

- #2484
- #2485 
- #2487 
- #2545
- #2546
- #2549
- #2554
- #2570
- #2571

---

* [x] I have read and agree to [Contributor
Guide](https://github.com/rerun-io/rerun/blob/main/CONTRIBUTING.md) and
the [Code of
Conduct](https://github.com/rerun-io/rerun/blob/main/CODE_OF_CONDUCT.md)
* [x] I've included a screenshot or gif (if applicable)
* [x] I have tested [demo.rerun.io](https://demo.rerun.io/pr/{{
pr.number }}) (if applicable)

- [PR Build Summary](https://build.rerun.io/pr/{{ pr.number }})
- [Docs preview](https://rerun.io/preview/{{
"pr:%s"|format(pr.branch)|encode_uri_component }}/docs)
- [Examples preview](https://rerun.io/preview/{{
"pr:%s"|format(pr.branch)|encode_uri_component }}/examples)
@jleibs jleibs mentioned this pull request Jul 27, 2023
Merged
3 tasks
jleibs added a commit that referenced this pull request Jul 27, 2023
@jleibs
Release 0.8 - Infrastructure investments and more transform improveme…
df05f49 
…nts - 2023-07-27 (#2842)

## [0.8.0](v0.7.0...v0.8.0) -
Infrastructure investments and more transform improvements - 2023-07-27

[Rerun](https://www.rerun.io/) is an easy-to-use visualization toolbox
for computer vision and robotics.

* Python: `pip install rerun-sdk`
* Rust: `cargo add rerun` and `cargo install rerun-cli`
* Online demo: <https://demo.rerun.io/version/0.8.0/>


### Overview & Highlights
- `log_pinhole` is now easier to use in simple cases and supports
non-RDF camera coordinates.
[#2614](#2614)
- You only need to set focal length and optional principal point instead
of setting the full 3x3 matrix.
- There is also a new argument: `camera_xyz` for setting the coordinate
system. The default is RDF (the old
default). This affects the visible camera frustum, how rays are
projected when hovering a 2D image, and how depth
   clouds are projected.
- The visualizer can now show coordinate arrows for all affine
transforms within the view.
[#2577](#2577)
- Linestrips and oriented bounding boxes can now be logged via batch
APIs in python.
- See: `log_linestrips_2d`, `log_linestrips_3d`,
[#2822](#2822) and `log_obbs`
[#2823](#2823)
- Rust users that build their own Viewer applications can now add fully
custom Space Views. Find more information
[here](https://www.rerun.io/docs/howto/extend-ui#custom-space-views-classes).
- New optional `flush_timeout` specifies how long Rerun will wait if a
TCP stream is disconnected during a flush.
[#2821](#2821)
- In Rust, `RecordingStream::connect` now requires `flush_timeout`
specified as an `Option<Duration>`.
- To keep default behavior, this can be specified using the
`rerun::default_flush_time()` helper.
- In Python `flush_init_sec` is now an optional argument to
`rr.connect()`
- In Rust, the `RecordingStream` now offers a stateful time API, similar
to the Python APIs. [#2506](#2506)
- You can now call `set_time_sequence`, `set_time_seconds`, and
`set_time_nanos` directly on the `RecordingStream`,
     which will set the time for all subsequent logs using that stream.
- This can be used as an alternative to the the previous
`MsgSender::with_time` APIs.
- The Rerun SDK now defaults to 8ms long microbatches instead of 50ms.
This makes the default behavior more suitable
for use-cases like real-time video feeds.
[#2220](#2220)
- Check out [the microbatching
docs](https://www.rerun.io/docs/reference/sdk-micro-batching) for more
information
   on fine-tuning the micro-batching behavior.
- The web viewer now incremental loads `.rrd` files when streaming over
HTTP. [#2412](#2412)

![Open Photogrammetry
Preview](https://static.rerun.io/9fa26e73a197690e0403cd35f29e31c2941dea36_release_080_photogrammetry_full.png)

### Ongoing Refactors
- There have been a number of significant internal changes going on
during this release with little visible impact.
This work will land across future releases, but is highlighted here
since much of it is visible through the
   changelog.
- The layout of the Viewer is now controlled by a Blueprint datastore.
In the future this will allow for direct API
control of the layout and configuration of the Viewer. A very early
prototype of this functionality is available
    via the `rerun.experimental` module in Python.
- An entirely new code-generation framework has been brought online for
Rust, Python and C++. This will eventually enable
new object-centric APIs with a more scalable, consistent, and ergonomic
experience.
- Bringup of C++ support is now underway and will eventually become our
third officially supported SDK language.

### Known Regressions
- Due to the Blueprint storage migration, blueprint persistence on web
is currently broken. Will be resolved in:
  [#2579](#2579)

### In Detail
#### 🐍 Python SDK
- Clean up warnings printed when `rr.init` hasn't been called
[#2209](#2209)
- Normalise Python typing syntax to 3.8+
[#2361](#2361)
- Simpler, sturdier stateful time tracking in both SDKs
[#2506](#2506)
- Fix not taking np.array for single colors
[#2569](#2569)
- Add a basic pyright config
[#2610](#2610)
- Improve `log_pinhole` and support non-RDF pinholes
[#2614](#2614)
- Expose batch APIs for linestrips
[#2822](#2822)
- Expose batch APIs for oriented bounding boxes
[#2823](#2823)

#### 🦀 Rust SDK
- Add example for adding custom Space Views
[#2328](#2328)
- Simpler, sturdier stateful time tracking in both SDKs
[#2506](#2506)
- Automagic flush when `take()`ing a `MemorySinkStorage`
[#2632](#2632)
- Logging SDK: Log warnings if user data is dropped
[#2630](#2630)
- Add support for `RecordingStream::serve`
[#2815](#2815)

#### 🌁 Viewer Improvements
- Better handle scroll-to-zoom in 3D views
[#1764](#1764)
- Add command to screenshot the application
[#2293](#2293)
- Show layout in blueprint tree view
[#2465](#2465)
- Double-click to select entity
[#2504](#2504)
- Add Rerun.io link/text in top bar
[#2540](#2540)
- New auto-layout of space views
[#2558](#2558)
- Add 'Dump datastore' command to palette
[#2564](#2564)
- Support any `dtype` for depth images
[#2602](#2602)
- Change "Save Selection" command to Cmd+Alt+S
[#2631](#2631)
- Consistent transform visualization for all entities with transforms
[#2577](#2577)
- Improve `log_pinhole` and support non-RDF pinholes
[#2614](#2614)

#### 🚀 Performance Improvements
- Flush the batches every 8ms instead of 50 ms
[#2220](#2220)
- Replace `image` crate jpeg decoder with zune-jpeg
[#2376](#2376)
- Stream `.rrd` files when loading via http
[#2412](#2412)

#### 🪳 Bug Fixes
- Fix deadlock when misusing the Caches
[#2318](#2318)
- Fix unstable order/flickering of "shown in" space view list on
selection [#2327](#2327)
- Fix transforms not applied to connections from transform context
[#2407](#2407)
- Fix texture clamping and color gradient selection being displayed
incorrectly [#2394](#2394)
- Fix projected ray length
[#2482](#2482)
- Tweak the depth bias multiplier for WebGL
[#2491](#2491)
- Clip image zoom rectangle
[#2505](#2505)
- Fix missing feature flags for benchmarks
[#2515](#2515)
- `run_all.py` script fixes
[#2519](#2519)
- Update egui_tiles with fix for drag-and-drop-panic
[#2555](#2555)
- Convert objectron proto.py back to using typing.List
[#2559](#2559)
- Exclude from `objectron/proto/objectron/proto.py` from `just
py-format` [#2562](#2562)
- Fix pinhole visualization not working with camera extrinsics &
intrinsics on the same path
[#2568](#2568)
- Fix: always auto-layout spaceviews until the user interveens
[#2583](#2583)
- Fix freeze/crash when logging large times
[#2588](#2588)
- Update egui_tiles to fix crash
[#2598](#2598)
- Fix clicking object with single instance (of every component)
selecting instance instead of entity
[#2573](#2573)
- Cleanup internal data-structures when process has been forked
[#2676](#2676)
- Fix shutdown race-condition by introducing a flush_timeout before
dropping data [#2821](#2821)
- Fix ui-scale based point/line sizes incorrectly scaled when zooming
based on horizontal dimension
[#2805](#2805)
- Fix visibility toggle for maximized Space Views
[#2806](#2806)
- Fix loading file via CLI
[#2807](#2807)
- Fix disconnected space APIs in Python SDK
[#2832](#2832)
- Avoid unwrap when generating authkey
[#2804](#2804)

#### 🧑‍🏫 Examples
- Add example template
[#2392](#2392)
- Show hidden url search param in `app.rerun.io`
[#2455](#2455)
- Minimal example of running an intel realsense depth sensor live
[#2541](#2541)
- Add a simple example to display Open Photogrammetry Format datasets
[#2512](#2512)
- Move `examples/api_demo` -> `tests/test_api`
[#2585](#2585)

#### 📚 Docs
- Docs: link to `rr.save` and suggest `rerun` instead of `python -m
rerun` [#2586](#2586)
- Update docs about transforms
[#2496](#2496)
- Fixup remaining usages of log_rigid3 in docs
[#2831](#2831)

#### 🎨 Renderer Improvements
- Expose type erased draw data that can be consumed directly
[#2300](#2300)
- Use less `mut` when using `RenderContext`
[#2312](#2312)

#### 🧑‍💻 Dev-experience
- Better error messages in build.rs
[#2173](#2173)
- Recommend sccache in CONTRIBUTING.md
[#2245](#2245)
- introduce `re_tracing`
[#2283](#2283)
- lint: standardize formatting of let-else-return statements
[#2297](#2297)
- Centralized build tools in `re_build_tools`
[#2331](#2331)
- Lint for explicit quotes
[#2332](#2332)
- Added example screenshot instructions in `just upload --help`
[#2454](#2454)
- Added support for puling image from an URL to `upload_image.py`
[#2462](#2462)
- `setup_dev.sh` now installs pngcrush
[#2470](#2470)
- Added docs/code-examples to the directories checked by py-lint and
py-format [#2476](#2476)
- Link to demo in PR + check checkboxes
[#2543](#2543)
- Add script to find external issues we haven't commented on
[#2532](#2532)
- Move CI-related scripts to its own folder
[#2561](#2561)
- Render PR description as template
[#2563](#2563)
- Add basic testing automation against all version of Python using nox
[#2536](#2536)
- Run clippy on public API too
[#2596](#2596)
- Bump all `py-lint`-related package versions
[#2600](#2600)
- Crates publishing script
[#2604](#2604)
- Fix rust docs deploy
[#2615](#2615)
- Add support for .gitignore to scripts/lint.py
[#2666](#2666)

#### 🗣 Refactors
- Refactor space-view dependencies:
- Move spatial space view to its own crate
[#2286](#2286)
- Separate crate for bar chart space view
[#2322](#2322)
- Separate crate for time series space view
[#2324](#2324)
- Separate crate for tensor space view
[#2334](#2334)
- Separate viewport related files out to a new re_viewport crate
[#2251](#2251)
- Remove timepanel dependency from viewport
[#2256](#2256)
- New trait system for SpaceViews:
- Initial Space View trait & port of text space views to the new Space
View trait system [#2281](#2281)
- Extend/iterate on SpaceViewClass framework with SceneContext & port
SpatialSpaceView scene parts
[#2304](#2304)
- Finalize move of SpatialSpaceView to SpaceViewClass trait framework
[#2311](#2311)
- Typename cleanup in SpaceViewClass framework
[#2321](#2321)
- Automatic fallback for unrecognized Space View Class, start removing
old ViewCategory [#2357](#2357)
- Rename ScenePart -> ViewPartSystem + related renamings
[#2674](#2674)
- Dynamically registered space view (part/context) systems
[#2688](#2688)
- Viewer's command queue is now a channel, allowing to queue commands
without mutable access
[#2339](#2339)
- Break up app.rs into parts
[#2303](#2303)
- Break out `re_log_types::component_types` as `re_components`
[#2258](#2258)
- Introduce StoreHub and rename Recording->Store
[#2301](#2301)
- Move StoreHub out of the Viewer during Update
[#2330](#2330)
- Expand CommandSender to support SystemCommand
[#2344](#2344)
- Use `camino` crate for UTF8 paths in `re_types_builder`
[#2637](#2637)
- Separate 2d & 3d spaceview classes, removal of `ViewCategory`,
`SpaceViewClass` driven spawn heuristics
[#2716](#2716)
- Move object property heuristics to heuristics.rs
[#2764](#2764)

#### 📦 Dependencies
- Version `rand` & friends at workspace level
[#2508](#2508)
- Update to PyO3 0.19
[#2350](#2350)
- Pin `half` to `2.2.1`
[#2587](#2587)

#### 📘 Blueprint Changes
- Drive blueprints off of a DataStore
[#2010](#2010)
- Split SpaceView -> SpaceViewState + SpaceViewBlueprint
[#2188](#2188)
- Split the Blueprint into AppBlueprint and ViewportBlueprint
[#2358](#2358)
- Swap the naming of Viewport and ViewportBlueprint
[#2595](#2595)
- Basic persistence for blueprints
[#2578](#2578)

#### 🏭 New Codegen Framework
- Codegen/IDL 1: add more build tools
[#2362](#2362)
- Codegen/IDL 2: introduce `re_types_builder`
[#2363](#2363)
- Codegen/IDL 3: introduce `re_types`
[#2369](#2369)
- Codegen/IDL 4: definitions for a `Points2D` archetype
[#2370](#2370)
- Codegen/IDL 5: auto-generated Python code for `Points2D`
[#2374](#2374)
- Codegen/IDL 7: handwritten Python tests and extensions for `Points2D`
[#2410](#2410)
- Codegen/IDL 6: auto-generated Rust code for `Points2D`
[#2375](#2375)
- Codegen/IDL 8: handwritten Rust tests and extensions for `Points2D`
[#2432](#2432)
- Codegen'd Rust/Arrow 1: upgrading to actual `TokenStream`s
[#2484](#2484)
- Codegen'd Rust/Arrow 2: matching legacy definitions
[#2485](#2485)
- Codegen'd Rust/Arrow 3: misc fixes & improvements
[#2487](#2487)
- Codegen'd Rust/Arrow 4: out-of-sync definitions CI detection
[#2545](#2545)
- Codegen'd Rust/Arrow 5: doc, definitions and regression tests for
combinatorial affixes
[#2546](#2546)
- Codegen'd Rust/Arrow 6: serialization
[#2549](#2549)
- Codegen'd Rust/Arrow 7: deserialization
[#2554](#2554)
- Codegen'd Rust/Arrow 8: carry extension metadata across transparency
layers [#2570](#2570)
- Codegen'd Rust/Arrow 9: Rust backport!
[#2571](#2571)
- End-to-end cross-language roundtrip tests for our archetypes
[#2601](#2601)
- Automatically derive `Debug` and `Clone` in Rust backend
[#2613](#2613)
- Generating (de)serialization code for dense unions in Rust backend
[#2626](#2626)
- Fix `FixedSizeList` deserialization edge-case + trivial optimizations
[#2673](#2673)
- Make `Datatype` & `Component` both inherit from `Loggable`
[#2677](#2677)
- Roundtrip-able `Transform3D`s
[#2669](#2669)
- Don't inline recursive datatypes in Rust backend
[#2760](#2760)
- Automatically derive `tuple_struct` attr and trivial `From` impls
where possible [#2772](#2772)
- Introduce roundtrip-able `Points3D` archetype (py + rs)
[#2774](#2774)
- Add `fmt::Debug` implementations to various types.
[#2784](#2784) (thanks
[@kpreid](https://github.com/kpreid)!)
- Isolate testing types in Rust backend
[#2810](#2810)
- Fix out-of-sync codegen hash
[#2567](#2567)
- Python backport: add `log_any()`
[#2581](#2581)
- Integrate unit examples into codegen stack
[#2590](#2590)
- Disable codegen on windows
[#2592](#2592)
- Python codegen: big cleaning and paving the way towards transforms
[#2603](#2603)
- Automatically assume arrow transparency for components
[#2608](#2608)
- Fix wrong path being `rerun_if_changed()` in `compute_dir_hash`
[#2612](#2612)
- Support transparency at the semantic layer
[#2611](#2611)
- Don't use builtin `required` anymore, introduce `nullable` instead
[#2619](#2619)
- Rust codegen: generate proper docstrings
[#2668](#2668)
- Support nullable Arrow unions using virtual union arms
[#2708](#2708)
- Introduce support for querying Archetypes
[#2743](#2743)
- Introduce legacy shims and migrate DataCell to re_types::Component
[#2752](#2752)

#### 🌊 Starting work on C++
- Seed of C and C++ SDKs
[#2594](#2594)
- Move C++ SDK to own folder
[#2624](#2624)
- C++ codegen [#2678](#2678)
- C++ codegen for reporting arrow data type for structs
[#2756](#2756)
- Don't inline recursive datatypes in C++ backend
[#2765](#2765)
- C++ codegen to_arrow_data_type for unions
[#2766](#2766)
- C++ codegen arrow serialize non-union components/datatypes without
nested rerun types [#2820](#2820)
- C++ codegen of structs and unions
[#2707](#2707)
- Fix cpp formatter differences
[#2773](#2773)

#### 🤷‍♂️ Other
- test_api: set different app_id based on what test is run
[#2599](#2599)
- Introduce `rerun compare` to check whether 2 rrd files are
functionally equivalent
[#2597](#2597)
- Remove `files.exclude` in vscode settings
[#2621](#2621)
- Support feature-gated rust attributes
[#2813](#2813)

### Checklist
* [x] I have read and agree to [Contributor
Guide](https://github.com/rerun-io/rerun/blob/main/CONTRIBUTING.md) and
the [Code of
Conduct](https://github.com/rerun-io/rerun/blob/main/CODE_OF_CONDUCT.md)
* [x] I've included a screenshot or gif (if applicable)
* [x] I have tested [demo.rerun.io](https://demo.rerun.io/pr/2842) (if
applicable)

- [PR Build Summary](https://build.rerun.io/pr/2842)
- [Docs preview](https://rerun.io/preview/pr%3Arelease-0.8/docs)
- [Examples preview](https://rerun.io/preview/pr%3Arelease-0.8/examples)
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@teh-cmc