Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/5445#discussion_r28200080
--- Diff: python/pyspark/sql/types.py ---
@@ -997,12 +997,13 @@ def _restore_object(dataType, obj):
# same object in most cases.
k = id(dataType)
cls = _cached_cls.get(k)
- if cls is None:
+ if cls is None or cls.__datatype is not dataType:
--- End diff --
I think we should change it into an assert, since that will make it easier
to debug this issue if it ever crops up again (if we accidentally removed the
reference keeping the `DataType` alive, for example).
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