Github user maver1ck commented on a diff in the pull request:
https://github.com/apache/spark/pull/19255#discussion_r139305244
--- Diff: python/pyspark/sql/types.py ---
@@ -24,6 +24,7 @@
import re
import base64
from array import array
+from functools import lru_cache
--- End diff --
Or use backported library.
https://pypi.python.org/pypi/functools32
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