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https://issues.apache.org/jira/browse/SPARK-11687?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen resolved SPARK-11687.
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Resolution: Won't Fix
> Mixed usage of fold and foldLeft, reduce and reduceLeft and reduceOption and
> reduceLeftOption
> ---------------------------------------------------------------------------------------------
>
> Key: SPARK-11687
> URL: https://issues.apache.org/jira/browse/SPARK-11687
> Project: Spark
> Issue Type: Improvement
> Reporter: Hyukjin Kwon
> Priority: Trivial
>
> As can be seen here
> https://github.com/scala/scala/blob/2.12.x/src/library/scala/collection/TraversableOnce.scala,
> {{fold}}, {{reduce}} and {{reduceOption}} came out from scala 2.9.x. In
> addition, all the implementations of {{fold}}, {{reduce}} and
> {{reduceOption}} call actually {{foldLeft}}, {{reduceLeft}} and
> {{reduceLeftOption}} directly without any additional codes.
> For developers who is not really used to scala, the mixed usage of them might
> leave a question, for example, if it works as reduceRight or reduceLeft (as
> all know, the direction can change the results). Even some usages can be
> found where they work identically the same things.
> This is just a little nit but I think it would be better to use only
> {{xxxLeft}} for readability.
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