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https://issues.apache.org/jira/browse/SPARK-20255?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15961173#comment-15961173
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Apache Spark commented on SPARK-20255:
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User 'adrian-ionescu' has created a pull request for this issue:
https://github.com/apache/spark/pull/17570
> FileIndex hierarchy inconsistency
> ---------------------------------
>
> Key: SPARK-20255
> URL: https://issues.apache.org/jira/browse/SPARK-20255
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Affects Versions: 2.1.0
> Reporter: Adrian Ionescu
> Priority: Minor
>
> Trying to get a grip on the {{FileIndex}} hierarchy, I was confused by the
> following inconsistency:
> On the one hand, {{PartitioningAwareFileIndex}} defines {{leafFiles}} and
> {{leafDirToChildrenFiles}} as abstract, but on the other it fully implements
> {{listLeafFiles}} which does all the listing of files. However, the latter is
> only used by {{InMemoryFileIndex}}.
> I'm hereby proposing to move this method (and all its dependencies) to the
> implementation class that actually uses it, and thus unclutter the
> {{PartitioningAwareFileIndex}} interface.
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