Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/18590#discussion_r126686970
--- Diff: python/pyspark/sql/functions.py ---
@@ -2026,16 +2026,26 @@ def __init__(self, func, returnType, name=None):
"{0}".format(type(func)))
self.func = func
- self.returnType = (
- returnType if isinstance(returnType, DataType)
- else _parse_datatype_string(returnType))
+ self._returnType = returnType
# Stores UserDefinedPythonFunctions jobj, once initialized
+ self._returnType_placeholder = None
self._judf_placeholder = None
self._name = name or (
func.__name__ if hasattr(func, '__name__')
else func.__class__.__name__)
@property
+ def returnType(self):
--- End diff --
hmm.. I tried several ways I could think at my best but I could not figure
out ...
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