zhengruifeng commented on code in PR #49005:
URL: https://github.com/apache/spark/pull/49005#discussion_r1868635769
##########
python/pyspark/sql/pandas/serializers.py:
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@@ -728,8 +743,9 @@ def load_stream(self, stream):
dataframes_in_group = read_int(stream)
if dataframes_in_group == 2:
+ # We need to fully load the left batches, but we can lazily
load the right batches
Review Comment:
I hope we can address the memory issue in `applyInArrow`, since it is not
completely resolved for `CoGrouped.applyInArrow`, I'd rather let it alone.
WDYT? @HyukjinKwon @xinrong-meng
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