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https://issues.apache.org/jira/browse/SPARK-27645?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16835294#comment-16835294
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Hyukjin Kwon commented on SPARK-27645:
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You can wrap {{Dataset}} to have the pre-calculated count, or take an argument
{{count}}. Or you can have a class that holds the count.
> Cache result of count function to that RDD
> ------------------------------------------
>
> Key: SPARK-27645
> URL: https://issues.apache.org/jira/browse/SPARK-27645
> Project: Spark
> Issue Type: New Feature
> Components: Spark Core
> Affects Versions: 2.4.3
> Reporter: Seungmin Lee
> Priority: Major
>
> I'm not sure whether there have been an update for this(as far as I know,
> there isn't such feature), since RDD is immutable, why don't we keep the
> result from count function of that RDD and reuse it in future calls?
> Sometimes, we only have RDD variable but don't have previously run result
> from count.
> In this case, not running whole count action to entire dataset would be very
> beneficial in terms of performance.
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