[FLINK-11147] Add documentation for TableAggregate Function

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.9.0
• Component/s: Table SQL / API
• Labels: pull-request-available
• Assignee: Hequn Cheng
• Reporter: Hequn Cheng
• Created: 13/Dec/18 09:02
• Updated: 02/Jul/19 00:03
• Resolved: 02/Jul/19 00:02

Description

Add documentation for TableAggregateFunction, similar to the document of AggregateFunction: https://ci.apache.org/projects/flink/flink-docs-release-1.7/dev/table/udfs.html#aggregation-functions

Most parts of TableAggregateFunction would be same with AggregateFunction, except for the ways of handling outputs. AggregateFunction outputs a scalar value, while TableAggregateFunction outputs a Table with multi rows and columns.

Issue Links

• links to: GitHub Pull Request #8669