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https://issues.apache.org/jira/browse/SPARK-15140?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15273100#comment-15273100
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Michael Armbrust commented on SPARK-15140:
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The 2.0 behavior seems correct. Ideally .toDS().collect() will always
round-trip the data without change.
> ensure input object of encoder is not null
> ------------------------------------------
>
> Key: SPARK-15140
> URL: https://issues.apache.org/jira/browse/SPARK-15140
> Project: Spark
> Issue Type: Improvement
> Reporter: Wenchen Fan
>
> Current we assume the input object for encoder won't be null, but we don't
> check it. For example, in 1.6 `Seq("a", null).toDS.collect` will throw NPE,
> in 2.0 this will return Array("a", null).
> We should define this behaviour more clearly.
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