Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/20473
The message seems now much clear :D.
```
========================================================================
Running PySpark tests
========================================================================
Running PySpark tests. Output is in
/home/jenkins/workspace/SparkPullRequestBuilder/python/unit-tests.log
Will test against the following Python executables: ['python2.7',
'python3.4', 'pypy']
Will test the following Python modules: ['pyspark-core', 'pyspark-sql',
'pyspark-streaming', 'pyspark-mllib', 'pyspark-ml']
Will skip PyArrow related features against Python executable 'python2.7' in
'pyspark-sql' module. PyArrow >= 0.8.0 is required; however, PyArrow was not
found.
Will skip Pandas related features against Python executable 'python2.7' in
'pyspark-sql' module. Pandas >= 0.19.2 is required; however, Pandas 0.16.0 was
found.
Will test PyArrow related features against Python executable 'python3.4' in
'pyspark-sql' module.
Will test Pandas related features against Python executable 'python3.4' in
'pyspark-sql' module.
Will skip PyArrow related features against Python executable 'pypy' in
'pyspark-sql' module. PyArrow >= 0.8.0 is required; however, PyArrow was not
found.
Will skip Pandas related features against Python executable 'pypy' in
'pyspark-sql' module. Pandas >= 0.19.2 is required; however, Pandas was not
found.
```
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