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https://issues.apache.org/jira/browse/SPARK-6878?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14492271#comment-14492271
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Sean Owen commented on SPARK-6878:
----------------------------------
Interesting question -- what's the expected sum of nothing at all? although I
can see the argument both ways, 0 is probably the better result since
{{Array[Double]().sum}} is 0. So {{sc.parallelize(Array[Double]()).sum}} should
as well. Want to make a PR?
> Sum on empty RDD fails with exception
> -------------------------------------
>
> Key: SPARK-6878
> URL: https://issues.apache.org/jira/browse/SPARK-6878
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 1.2.0
> Reporter: Erik van Oosten
> Priority: Minor
>
> {{Sum}} on an empty RDD throws an exception. Expected result is {{0}}.
> A simple fix is the replace
> {noformat}
> class DoubleRDDFunctions {
> def sum(): Double = self.reduce(_ + _)
> {noformat}
> with:
> {noformat}
> class DoubleRDDFunctions {
> def sum(): Double = self.aggregate(0.0)(_ + _, _ + _)
> {noformat}
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