manuzhang opened a new pull request, #16783:
URL: https://github.com/apache/iceberg/pull/16783
## Summary
This updates Spark CI to generate its test matrix from the files changed in
a pull request.
For pull requests that only touch version-scoped Spark directories such as
`spark/v4.1/**`, the workflow now runs only that Spark version's jobs. Changes
to shared code, build files, workflow files, or any unknown relevant path
continue to run the full Spark matrix.
## Why
The existing workflow always expands the full Spark matrix once Spark CI is
triggered, so a Spark 4.1-only change still runs Spark 4.0 jobs. This keeps
coverage for shared changes while avoiding unrelated version-specific test jobs.
## Validation
- Parsed `.github/workflows/spark-ci.yml` with Ruby YAML loading.
- Ran `bash -n` against the generated detector script.
- Simulated changed-file detection for:
- `spark/v4.1/**` selecting only Spark 4.1 jobs
- `.github/workflows/spark-ci.yml` selecting the full matrix
- ignored docs plus `spark/v4.1/**` still selecting only Spark 4.1 jobs
- Ran `git diff --check`.
`actionlint` was not installed locally, so I could not run it before opening
the draft PR.
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