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https://issues.apache.org/jira/browse/SPARK-6379?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14364581#comment-14364581
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Apache Spark commented on SPARK-6379:
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User 'maropu' has created a pull request for this issue:
https://github.com/apache/spark/pull/5061
> Support an implicit conversion from udf"name" to an UDF defined in SQLContext
> -----------------------------------------------------------------------------
>
> Key: SPARK-6379
> URL: https://issues.apache.org/jira/browse/SPARK-6379
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Takeshi Yamamuro
>
> This is useful for using pre-defined UDFs in SQLContext;
> val df = Seq(("id1", 1), ("id2", 4), ("id3", 5)).toDF("id", "value")
> df.sqlContext.udf.register("simpleUdf", (v: Int) => v * v)
> df.select($"id", udf"simpleUdf"($"value"))
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