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https://issues.apache.org/jira/browse/SPARK-5605?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14306326#comment-14306326
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Apache Spark commented on SPARK-5605:
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User 'rxin' has created a pull request for this issue:
https://github.com/apache/spark/pull/4376
> Allow using String to specify colum name in DSL aggregate functions
> -------------------------------------------------------------------
>
> Key: SPARK-5605
> URL: https://issues.apache.org/jira/browse/SPARK-5605
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Reporter: Reynold Xin
> Assignee: Reynold Xin
>
> Since it is unlikely users need to call aggregate functions on a literal
> string, we might as well simplify the dsl to also support calling aggregate
> functions on a column by name.
> e.g.
> sum("colName")
> instead of
> sum($"colName") or sum(col("colName"))
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