Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/4808#discussion_r25539940
--- Diff: python/pyspark/sql/types.py ---
@@ -505,6 +508,9 @@ def __eq__(self, other):
def _parse_datatype_json_string(json_string):
"""Parses the given data type JSON string.
+ >>> import pickle
--- End diff --
It looks like this is a regression test for the singleton `__eq__` issue.
It feels a little odd to have this as a doctest as opposed to a dedicated
`unittest` regression test. Maybe we could move this into a new test case and
add a comment referencing this JIRA?
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