Apache Spark commented on SPARK-23661:

User 'viirya' has created a pull request for this issue:

> Implement treeAggregate on Dataset API
> --------------------------------------
>                 Key: SPARK-23661
>                 URL: https://issues.apache.org/jira/browse/SPARK-23661
>             Project: Spark
>          Issue Type: New Feature
>          Components: SQL
>    Affects Versions: 2.4.0
>            Reporter: Liang-Chi Hsieh
>            Priority: Major
> Many algorithms in MLlib are still not migrated their internal computing 
> workload from {{RDD}} to {{DataFrame}}. {{treeAggregate}} is one of obstacles 
> we need to address in order to see complete migration.
> This ticket is opened to provide {{treeAggregate}} on Dataset API. For now 
> this should be a private API used by ML component.

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