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https://issues.apache.org/jira/browse/SPARK-12105?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16434015#comment-16434015
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Tomasz Gawęda commented on SPARK-12105:
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+1, It's a quite common question on StackOverflow: "how to print show() result 
in custom PrintStream"

> Add a DataFrame.show() with argument for output PrintStream
> -----------------------------------------------------------
>
>                 Key: SPARK-12105
>                 URL: https://issues.apache.org/jira/browse/SPARK-12105
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 1.5.2
>            Reporter: Dean Wampler
>            Priority: Minor
>
> It would be nice to send the output of DataFrame.show(...) to a different 
> output stream than stdout, including just capturing the string itself. This 
> is useful, e.g., for testing. Actually, it would be sufficient and perhaps 
> better to just make DataFrame.showString a public method, 



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