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https://issues.apache.org/jira/browse/SPARK-9856?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14699184#comment-14699184
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Sun Rui commented on SPARK-9856:
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That's OK. Keep going on.
> Add expression functions into SparkR whose params are complicated
> -----------------------------------------------------------------
>
> Key: SPARK-9856
> URL: https://issues.apache.org/jira/browse/SPARK-9856
> Project: Spark
> Issue Type: Sub-task
> Components: SparkR
> Reporter: Yu Ishikawa
>
> Add expression functions whose parameters are a little complicated, like
> {{regexp_extract(e: Column, exp: String, groupIdx: Int)}} and
> {{regexp_replace(e: Column, pattern: String, replacement: String)}}.
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