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https://issues.apache.org/jira/browse/SPARK-9871?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14696706#comment-14696706
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Yu Ishikawa commented on SPARK-9871:
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I think it would be better to deal with {{struct}} on another issue. Since
{{collect}} doesn't work with a DataFrame which has a column of Struct type. So
we need to improve {{collect}} method.
When I tried to implement {{struct}} function, a strict column converted by
{{dfToCols}} consists of {{jobj}}
{noformat}
List of 1
$ structed:List of 2
..$ :Class 'jobj' <environment: 0x7fd46efe4e68>
..$ :Class 'jobj' <environment: 0x7fd46efee078>
{noformat}
> Add expression functions into SparkR which have a variable parameter
> --------------------------------------------------------------------
>
> Key: SPARK-9871
> URL: https://issues.apache.org/jira/browse/SPARK-9871
> Project: Spark
> Issue Type: Sub-task
> Components: SparkR
> Reporter: Yu Ishikawa
>
> Add expression functions into SparkR which has a variable parameter, like
> {{concat}}
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