Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/7499#issuecomment-122726109
@sixers, my suggestion was to add an end-to-end test, like
`sqlContext.sql("select null").collect()`, to PySpark SQL's `SQLTests` unittest
suite:
https://github.com/apache/spark/blob/163e3f1df94f6b7d3dadb46a87dbb3a2bade3f95/python/pyspark/sql/tests.py#L130.
This could be a new test case, named something like
`test_select_null_literal`.
The fact that this bug was unnoticed for so long implies that our Python
suite doesn't contain any tests which try to select null literals, which is why
I wanted to add such a test.
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