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From "Apache Spark (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-22239) User-defined window functions with pandas udf
Date Mon, 16 Apr 2018 22:09:00 GMT

    [ https://issues.apache.org/jira/browse/SPARK-22239?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16440094#comment-16440094
] 

Apache Spark commented on SPARK-22239:
--------------------------------------

User 'icexelloss' has created a pull request for this issue:
https://github.com/apache/spark/pull/21082

> User-defined window functions with pandas udf
> ---------------------------------------------
>
>                 Key: SPARK-22239
>                 URL: https://issues.apache.org/jira/browse/SPARK-22239
>             Project: Spark
>          Issue Type: Sub-task
>          Components: PySpark
>    Affects Versions: 2.2.0
>         Environment: 
>            Reporter: Li Jin
>            Priority: Major
>
> Window function is another place we can benefit from vectored udf and add another useful
function to the pandas_udf suite.
> Example usage (preliminary):
> {code:java}
> w = Window.partitionBy('id').orderBy('time').rangeBetween(-200, 0)
> @pandas_udf(DoubleType())
> def ema(v1):
>     return v1.ewm(alpha=0.5).mean().iloc[-1]
> df.withColumn('v1_ema', ema(df.v1).over(window))
> {code}



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