Mark Hildreth created ARROW-8648:
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Summary: [Rust] Optimize Rust CI Build Times
Key: ARROW-8648
URL: https://issues.apache.org/jira/browse/ARROW-8648
Project: Apache Arrow
Issue Type: Improvement
Reporter: Mark Hildreth
In the Rust CI workflows (rust_build.sh, rust_test.sh), there are some build
options used that are at odds with each other, resulting in multiple redundant
builds where a smaller number could do the same job. The following tweaks, at
minimal, could reduce this, speeding up build times:
* Ensure that RUSTFLAGS="-D warnings" is used for all cargo commands.
Currently, it's only used for a single command (the {{build --all-targets}} in
{{rust_build.sh}}). Subsuquent runs of cargo will ignore this first build,
since RUSTFLAGS has changed.
* Don't run examples in release mode, as that would force a new (and slower)
rebuild, when the examples have already been built in debug mode.
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