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https://issues.apache.org/jira/browse/SPARK-19462?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=15853188#comment-15853188
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Ian commented on SPARK-19462:
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In fact, the "Exchange not implemented for UnknownPartitioning(1)" can be
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https://issues.apache.org/jira/browse/SPARK-19462?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=15853184#comment-15853184
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Ian commented on SPARK-19462:
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When the RDD lineage contains ShuffledRowRDD, the above mentioned behavior can