Github user kevinyu98 commented on the issue: https://github.com/apache/spark/pull/22100 @HyukjinKwon @dilipbiswal Thanks for your comments, I have changed the code. I removed the code changes in tests.py, because it got warning message during style checking, and I did manually testing and add the result in the pr description. `Qianyangs-MBP:spark qianyangyu$ ./dev/lint-python ./python/pyspark/sql/tests.py:4357: SyntaxWarning: import * only allowed at module level @unittest.skipIf( pycodestyle checks passed. rm -rf _build/* pydoc checks passed.`
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