[jira] [Commented] (SPARK-17694) convert DataFrame to DataSet should check columns match

["Sean Owen (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-17694?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15527653#comment-15527653 ] 

Sean Owen commented on SPARK-17694:
-----------------------------------

Here what do you mean that it succeeds? it's a lazy transformation so won't fail-fast, but if it's an incorrect mapping, it can't succeed when evaluated at all right?

> convert DataFrame to DataSet should check columns match
> -------------------------------------------------------
>
>                 Key: SPARK-17694
>                 URL: https://issues.apache.org/jira/browse/SPARK-17694
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 1.6.1, 1.6.2
>            Reporter: Chenliang Xu
>            Priority: Minor
>
> The {{as}} method, which converts a DataFrame to DataSet requires the user to ensure the columns are match. And it success even the columns do not match, and cause error at later steps.
> It would be better, to let {{as}} match the columns, and fail/warn when the match fails.



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