Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/7301#discussion_r34229271
--- Diff: python/pyspark/sql/types.py ---
@@ -71,6 +67,15 @@ def json(self):
separators=(',', ':'),
sort_keys=True)
+ def needSerialization(self):
--- End diff --
I guess that the rationale for this vs. implementing the identity function
as a serializer is the fact that we may be dealing with nested data structures
like lists and maps so we want to avoid applying the identity function to each
element of the array by skipping the conversion entirely if we have an array of
types that don't need to be serialized / converted.
Maybe we should explain this?
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