Github user vlad17 commented on the issue:
https://github.com/apache/spark/pull/13724
The issue is that there are still some references to the old
`GroupedData._jdf` attribute - if you click on the the Jenkins link you'll find
where (but I pasted below too):
Error Message
```
'GroupedData' object has no attribute '_jdf'
Stacktrace
Traceback (most recent call last):
File
"/home/jenkins/workspace/SparkPullRequestBuilder/python/pyspark/sql/tests.py",
line 682, in test_aggregator
self.assertEqual([Row(**{"AVG(key#0)": 49.5})], g.mean().collect())
File
"/home/jenkins/workspace/SparkPullRequestBuilder/python/pyspark/sql/group.py",
line 40, in _api
jdf = getattr(self._jdf, name)(_to_seq(self.sql_ctx._sc, cols))
AttributeError: 'GroupedData' object has no attribute '_jdf'
```
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