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https://issues.apache.org/jira/browse/SPARK-16046?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15837259#comment-15837259
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Xiao Li commented on SPARK-16046:
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I updated the JIRA description based on what the PR did. Please open a separate
JIRA if we need more documentation changes. Thanks!
> Add Aggregations Section to Spark SQL programming guide
> -------------------------------------------------------
>
> Key: SPARK-16046
> URL: https://issues.apache.org/jira/browse/SPARK-16046
> Project: Spark
> Issue Type: Documentation
> Components: Documentation, SQL
> Affects Versions: 2.0.0
> Reporter: Pedro Rodriguez
> Assignee: Anton Okolnychyi
> Fix For: 2.1.1, 2.2.0
>
>
> - A separate subsection for Aggregations under “Getting Started” in the Spark
> SQL programming guide. It mentions which aggregate functions are predefined
> and how users can create their own.
> - Examples of using the UserDefinedAggregateFunction abstract class for
> untyped aggregations in Java and Scala.
> - Examples of using the Aggregator abstract class for type-safe aggregations
> in Java and Scala.
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