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https://issues.apache.org/jira/browse/SPARK-6608?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14386635#comment-14386635
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Apache Spark commented on SPARK-6608:
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User 'liancheng' has created a pull request for this issue:
https://github.com/apache/spark/pull/5265
> Make DataFrame.rdd a lazy val
> -----------------------------
>
> Key: SPARK-6608
> URL: https://issues.apache.org/jira/browse/SPARK-6608
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 1.3.0
> Reporter: Cheng Lian
> Priority: Minor
>
> Before 1.3.0, {{SchemaRDD.id}} works as a unique identifier of each
> {{SchemaRDD}}. In 1.3.0, unlike {{SchemaRDD}}, {{DataFrame}} is no longer an
> RDD, and {{DataFrame.rdd}} is actually a function which always return a new
> RDD instance. Making {{DataFrame.rdd}} a {{lazy val}} should bring the unique
> identifier back.
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