omertt27 opened a new pull request, #49475:
URL: https://github.com/apache/arrow/pull/49475
### Summary
Closes #49397.
This PR validates and fixes the `PYARROW_GENERATE_COVERAGE` flag so that
Cython coverage reporting works end-to-end for the PyArrow test suite.
### Changes
**`python/pyarrow/conftest.py`**
- Added a `pytest_configure` hook that activates the `Cython.Coverage`
plugin and calls `coverage.process_startup()` when
`PYARROW_GENERATE_COVERAGE` is set.
- This must run before any pyarrow modules are imported so that the
Cython line-tracing hooks embedded at build time are picked up by
`coverage.py`.
- A clear `UserWarning` is raised if `coverage` or `Cython` are not
installed, with instructions to install them.
**`python/.coveragerc`**
- Added `source`, `branch`, `report` and `html` sections so `coverage.py`
knows which files to measure and where to write the report.
### How to use
```bash
# Build pyarrow with Cython line tracing enabled
PYARROW_GENERATE_COVERAGE=1 pip install -e python/
# Run tests with coverage
cd python
PYARROW_GENERATE_COVERAGE=1 coverage run -m pytest pyarrow/tests/ -x -q
# View report
coverage report
coverage html
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