Github user BryanCutler commented on a diff in the pull request:
https://github.com/apache/spark/pull/19459#discussion_r150308054
--- Diff: python/pyspark/serializers.py ---
@@ -225,11 +232,11 @@ def _create_batch(series):
# If a nullable integer series has been promoted to floating point
with NaNs, need to cast
# NOTE: this is not necessary with Arrow >= 0.7
def cast_series(s, t):
- if type(t) == pa.TimestampType:
+ if t is not None and type(t) == pa.TimestampType:
--- End diff --
verified this is not an issue with pyarrow >= 0.7.1
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