Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/4808#discussion_r25541610
--- Diff: python/pyspark/sql/types.py ---
@@ -786,8 +792,24 @@ def _merge_type(a, b):
return a
+def _need_converter(dataType):
+ if isinstance(dataType, StructType):
+ return True
+ elif isinstance(dataType, ArrayType):
+ return _need_converter(dataType.elementType)
+ elif isinstance(dataType, MapType):
+ return _need_converter(dataType.keyType) or
_need_converter(dataType.valueType)
+ elif isinstance(dataType, NullType):
+ return True
+ else:
+ return False
+
+
def _create_converter(dataType):
"""Create an converter to drop the names of fields in obj """
+ if not _need_converter(dataType):
--- End diff --
Ah, right; I overlooked that. Makes sense.
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