5e7973df0e
This PR fixes the sum issue and also adds `emptyRDD` so that it's easy to create a test case.
Author: zsxwing <zsxwing@gmail.com>
Closes #6826 from zsxwing/python-emptyRDD and squashes the following commits:
b36993f [zsxwing] Update the return type to JavaRDD[T]
71df047 [zsxwing] Add emptyRDD to pyspark and fix the issue when calling sum on an empty RDD
(cherry picked from commit
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