Shixiong Zhu created SPARK-8373:
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Summary: When an RDD has no partition, Python sum will throw "Can
not reduce() empty RDD"
Key: SPARK-8373
URL: https://issues.apache.org/jira/browse/SPARK-8373
Project: Spark
Issue Type: Bug
Components: PySpark
Reporter: Shixiong Zhu
The issue is because "sum" uses "reduce". Replacing it with "fold" will fix it.
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