gaogaotiantian opened a new pull request, #57587:
URL: https://github.com/apache/spark/pull/57587
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### What changes were proposed in this pull request?
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Add smart test selection for pyspark test framework. The approach is:
1. In `run-tests.py`, check changed files. Rule out the known irrelevant
files (that belongs to `dev_tool` module). If the rest only contains `pyspark`
files, trigger this mechanism by
a. get the relevant changed file list
b. write that list to a temp file
c. pass the path to the temp file to `python/run-tests.py`
2. In `python/run-tests.py`, if changed file path is received, add that to
the env var so all the subprocesses get it.
3. For all PySpark tests, in `setUpClass`, try to read that env var (which
is super cheap). If the env var exists, get the list, build a pyspark graph
(sub-second cost per module) and analyze if the module of the test class is
impacted by the changed files.
4. If the test is not impacted, skip it.
### Why are the changes needed?
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We will only run impacted tests on python-only changes by accurately
analyzing the changed files. This will save us plenty of CI time.
### Does this PR introduce _any_ user-facing change?
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In theory, `pyspark/testing` is public to users. However, this mechanism is
for pyspark tests and is gated by the env var. It should not impact any users
that do not want it.
### How was this patch tested?
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A feature test file is added for multiple cases. Some manual tests are done
locally. However, whether it works for E2E scenarios, we need to observe the
post-merge CIs for python-only changes.
The changed code is also reviewed by Claude Code (Opus 4.8)
### Was this patch authored or co-authored using generative AI tooling?
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Only the test file is generated by LLM (with some tuning so it's better
organized).
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