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https://issues.apache.org/jira/browse/SPARK-7683?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15076650#comment-15076650
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Maciej Szymkiewicz commented on SPARK-7683:
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[~srowen] Do you have any example how it could break existing code? In Scala it
is pretty obvious but it looks like the current implementation isolates Python
RDDs from the effects of modifying mutable elements in place.
> Confusing behavior of fold function of RDD in pyspark
> -----------------------------------------------------
>
> Key: SPARK-7683
> URL: https://issues.apache.org/jira/browse/SPARK-7683
> Project: Spark
> Issue Type: Sub-task
> Components: PySpark
> Affects Versions: 1.3.1
> Reporter: Ai He
> Priority: Minor
> Labels: releasenotes
>
> This will make the “fold” function consistent with the "fold" in rdd.scala
> and other "aggregate" functions where “acc” goes first. Otherwise, users have
> to write a lambda function like “lambda x, y: op(y, x)” if they want to use
> “zeroValue” to change the result type.
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