Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/9766#discussion_r82876419
--- Diff: python/pyspark/sql/context.py ---
@@ -202,6 +202,26 @@ def registerFunction(self, name, f,
returnType=StringType()):
"""
self.sparkSession.catalog.registerFunction(name, f, returnType)
+ @ignore_unicode_prefix
+ @since(2.1)
+ def registerJavaFunction(self, name, javaClassName,
returnType=StringType()):
+ """Register a java UDF so it can be used in SQL statements.
+
+ In addition to a name and the function itself, the return type can
be optionally specified.
+ When the return type is not given it default to a string and
conversion will automatically
--- End diff --
Where does this conversion happen? Are we sure that it works (given there
are no tests that I see).
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