Github user aray commented on a diff in the pull request:
https://github.com/apache/spark/pull/19226#discussion_r138917350
--- Diff: python/pyspark/serializers.py ---
@@ -343,6 +343,8 @@ def _load_stream_without_unbatching(self, stream):
key_batch_stream =
self.key_ser._load_stream_without_unbatching(stream)
val_batch_stream =
self.val_ser._load_stream_without_unbatching(stream)
for (key_batch, val_batch) in zip(key_batch_stream,
val_batch_stream):
+ key_batch = list(key_batch)
+ val_batch = list(val_batch)
--- End diff --
fixed in 66477f8
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