Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/7450#discussion_r34919707
--- Diff: python/pyspark/sql/functions.py ---
@@ -658,23 +658,26 @@ class UserDefinedFunction(object):
.. versionadded:: 1.3
"""
- def __init__(self, func, returnType):
+ def __init__(self, func, returnType, name=None):
self.func = func
self.returnType = returnType
self._broadcast = None
- self._judf = self._create_judf()
+ self._judf = self._create_judf(name)
- def _create_judf(self):
- f = self.func # put it in closure `func`
- func = lambda _, it: map(lambda x: f(*x), it)
+ def _create_judf(self, name):
+ f, returnType = self.func, self.returnType # put them in closure
`func`
+ from pyspark.serializers import CloudPickleSerializer
+ CloudPickleSerializer().dumps(returnType)
+ func = lambda _, it: map(lambda x: returnType.toInternal(f(*x)),
it)
--- End diff --
Note for other reviewers: this is the key line of this patch, which
performs the return type conversion; the rest of the patch is cleanup /
refactoring.
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