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https://issues.apache.org/jira/browse/SPARK-19177?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15821986#comment-15821986
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Shivaram Venkataraman commented on SPARK-19177:
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Thanks for the example - this is very useful. Just to confirm the problem here 
is in dealing with schema objects and specifically being able to append and / 
or optionally mutate the schema ? I'll update the JIRA title appropriately and 
we'll work on a fix for this.

> SparkR Data Frame operation between columns elements
> ----------------------------------------------------
>
>                 Key: SPARK-19177
>                 URL: https://issues.apache.org/jira/browse/SPARK-19177
>             Project: Spark
>          Issue Type: Question
>          Components: SparkR
>    Affects Versions: 2.0.2
>            Reporter: Vicente Masip
>            Priority: Minor
>              Labels: schema, sparkR, struct
>
> I have commented this in other thread, but I think it can be important to 
> clarify that:
> What happen when you are working with 50 columns and gapply? Do I rewrite 50 
> columns scheme with it's new column from gapply operation? I think there is 
> no alternative because structFields cannot be appended to structType. Any 
> suggestions?



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