wiedld commented on code in PR #6303:
URL: https://github.com/apache/arrow-rs/pull/6303#discussion_r1777486806
##########
arrow-array/src/array/union_array.rs:
##########
@@ -380,6 +392,254 @@ impl UnionArray {
_ => unreachable!(),
}
}
+
+ /// Computes the logical nulls for a sparse union, optimized for when
there's a lot of fields without nulls
+ fn mask_sparse_skip_without_nulls(&self, nulls: Vec<(i8, NullBuffer)>) ->
BooleanBuffer {
Review Comment:
Sure thing. Here is the [cov
report](https://github.com/user-attachments/files/17153113/cov_union_arrays.tar.gz).
I added in `assert!(false)` lines for verification of coverage gaps; also
makes skimming the report easier.
<details>
<p>
```
# to open
> tar -xvf cov_union_arrays.tar.gz
> open cov_union_arrays.html
# how generated
> RUSTFLAGS='-Z profile -C codegen-units=1'
CARGO_CFG_REGEX_DISABLE_AUTO_OPTIMIZATIONS=1 cargo +nightly cov test -p
arrow-array --lib
> cargo +nightly cov report --open
# save as complete webpage (give you interactive bits), and tarball
```
</p>
</details>
Your call on wherever you want correctness coverage @gstvg . Hope this
helps.
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