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https://issues.apache.org/jira/browse/SPARK-23627?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hyukjin Kwon resolved SPARK-23627.
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Resolution: Fixed
Fix Version/s: 2.4.0
Issue resolved by pull request 20800
[https://github.com/apache/spark/pull/20800]
> Provide isEmpty() function in DataSet
> -------------------------------------
>
> Key: SPARK-23627
> URL: https://issues.apache.org/jira/browse/SPARK-23627
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core, SQL
> Affects Versions: 2.1.0
> Reporter: Goun Na
> Priority: Trivial
> Fix For: 2.4.0
>
>
> Like rdd.isEmpty, adding isEmpty to DataSet would useful.
> Some code without isEmpty:
> {code:java}
> if (df.count = 0) { do_something }{code}
> Some people add limit 1 for a performance reason:
> {code:java}
> if (df.limit(1).rdd.isEmpty) { do_something }
> if (df.rdd.take(1).isEmpty) { do_something }{code}
>
> If isEmpty is provided, the code will be perfect clean:
> {code:java}
> if (df.isEmpty) { do_something }{code}
>
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