allisonwang-db commented on code in PR #53976:
URL: https://github.com/apache/spark/pull/53976#discussion_r2729092302
##########
python/pyspark/sql/pandas/serializers.py:
##########
@@ -180,6 +180,31 @@ def _load_group_dataframes(self, stream, num_dfs: int = 1):
messageParameters={"dataframes_in_group":
str(dataframes_in_group)},
)
+ def _write_stream_start(self, batch_iterator, stream):
+ """
+ Write START_ARROW_STREAM before the first batch, passing batches
through unchanged.
+
Review Comment:
Can we also add a comment specifying why START_ARROW_STREAM needs to be sent
in certain cases?
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