[SPARK-16046] Add Aggregations Section to Spark SQL programming guide

• Type: Documentation
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0.0
• Fix Version/s: 2.1.1, 2.2.0
• Component/s: Documentation, SQL
• Assignee: Anton Okolnychyi
• Reporter: Pedro Rodriguez
• Created: 18/Jun/16 13:20
• Updated: 25/Jan/17 06:20
• Resolved: 25/Jan/17 06:14

Description

• 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.

Issue Links

• links to: [Github] Pull Request #16329 (aokolnychyi)