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https://issues.apache.org/jira/browse/SPARK-21109?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hyukjin Kwon resolved SPARK-21109.
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Resolution: Incomplete
> union two dataset[A] don't work as expected if one of the datasets
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https://issues.apache.org/jira/browse/SPARK-21109?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen resolved SPARK-21109.
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Resolution: Not A Problem
> union two dataset[A] don't work as expected if one of the datasets is
>