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https://issues.apache.org/jira/browse/SPARK-23465?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16369275#comment-16369275
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Mihaly Toth commented on SPARK-23465:
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I have started working on this.
> Dataset.withAllColumnsRenamed should map all column names to a new one
> ----------------------------------------------------------------------
>
> Key: SPARK-23465
> URL: https://issues.apache.org/jira/browse/SPARK-23465
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.3.1
> Reporter: Mihaly Toth
> Priority: Minor
>
> Currently one can only rename a column only one by one using
> {{withColumnRenamed()}} function. When one would like to rename all or most
> of the columns it would be easier to specify an algorithm for mapping from
> the old to the new name (like prefixing) than iterating over all the fields.
> Example usage is joining to a Dataset with the same or similar schema
> (special case is self joining) where the names are the same or overlapping.
> Such a joined Dataset would fail at {{saveAsTable()}}
> With the new function usage would be easy like that:
> {code:java}
> ds.withAllColumnsRenamed("prefix" + _)
> {code}
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