Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/5445#discussion_r28200455
--- Diff: python/pyspark/sql/types.py ---
@@ -1119,8 +1120,8 @@ def Dict(d):
class Row(tuple):
""" Row in DataFrame """
- __DATATYPE__ = dataType
- __FIELDS__ = tuple(f.name for f in dataType.fields)
+ __datatype = dataType
--- End diff --
_restore_object is only used for Row, so the dataType should be StructType.
The reason it will crash while Row has a reference to dataType is that there
will be multiple id for a Row class in `_cached_cls`, all of them are the same
StructType, but from different batches (see another comment).
So we should not add `__dataType__` for other datatypes
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