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https://issues.apache.org/jira/browse/SPARK-37647?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Nicholas Chammas resolved SPARK-37647.
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Resolution: Fixed
It looks like this got added as part of Spark 3.5:
[https://spark.apache.org/docs/latest/api/python/reference/pyspark.sql/api/pyspark.sql.functions.percentile.html]
> Expose percentile function in Scala/Python APIs
> -----------------------------------------------
>
> Key: SPARK-37647
> URL: https://issues.apache.org/jira/browse/SPARK-37647
> Project: Spark
> Issue Type: Improvement
> Components: PySpark, SQL
> Affects Versions: 3.2.0
> Reporter: Nicholas Chammas
> Priority: Minor
>
> SQL offers a percentile function (exact, not approximate) that is not
> available directly in the Scala or Python DataFrame APIs.
> While it is possible to invoke SQL functions from Scala or Python via
> {{{}expr(){}}}, I think most users expect function parity across Scala,
> Python, and SQL.
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