zhengruifeng opened a new pull request, #55875:
URL: https://github.com/apache/spark/pull/55875
### What changes were proposed in this pull request?
Drop the redundant `SQLTestUtils` mixin from `ReusedMixedTestCase` in
`python/pyspark/testing/connectutils.py`.
```diff
-class ReusedMixedTestCase(ReusedConnectTestCase, SQLTestUtils):
+class ReusedMixedTestCase(ReusedConnectTestCase):
```
Its parent `ReusedConnectTestCase` already mixes in `SQLTestUtils`:
```python
class ReusedConnectTestCase(PySparkBaseTestCase, SQLTestUtils,
PySparkErrorTestUtils):
```
so listing `SQLTestUtils` again on `ReusedMixedTestCase` is redundant. The
MRO and the inherited helper methods (`sql_conf`, `table`, `temp_view`, ...)
are unchanged after the drop:
```
MRO: ['ReusedMixedTestCase', 'ReusedConnectTestCase',
'PySparkBaseTestCase', 'TestCase', 'SQLTestUtils',
'PySparkErrorTestUtils', 'object']
```
The `from pyspark.testing.sqlutils import SQLTestUtils` import is kept
because `ReusedConnectTestCase` still uses it.
### Why are the changes needed?
Cleanup — same spirit as #55586 (`[SPARK-56841][SQL][TESTS] Drop redundant
BeforeAndAfterEach and SharedSparkSession mixins`) but on the Python side.
### Does this PR introduce _any_ user-facing change?
No. Test-infra-only change.
### How was this patch tested?
MRO and `issubclass` checks on `ReusedMixedTestCase` confirm `SQLTestUtils`,
`PySparkErrorTestUtils`, and `unittest.TestCase` are all still in the chain,
and that helper methods `sql_conf` / `table` still resolve via the inherited
`SQLTestUtils`.
### Was this patch authored or co-authored using generative AI tooling?
Generated-by: Claude opus-4-7
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