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https://issues.apache.org/jira/browse/SPARK-21436?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16570573#comment-16570573
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Apache Spark commented on SPARK-21436:
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User 'holdenk' has created a pull request for this issue:
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https://issues.apache.org/jira/browse/SPARK-21436?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16570517#comment-16570517
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holdenk commented on SPARK-21436:
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@[~podongfeng]
So distinct triggers a `map` first (e.g. it is
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zhengruifeng commented on SPARK-21436:
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[~holdenk] It looks like that \{distinct} already utilized
