[FLINK-20522] Make implementing a built-in function straightforward

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.13.0
• Component/s: Table SQL / API, Table SQL / Planner
• Labels: pull-request-available
• Assignee: Timo Walther
• Reporter: Timo Walther
• Created: 07/Dec/20 16:15
• Updated: 28/May/21 07:03
• Resolved: 08/Jan/21 09:26

Description

FLIP-65 has introduced new abstractions for functions. They make implementing user-defined functions straightforward. However, currently, these abstraction are not available for built-in functions. Adding a built-in function requires many changes at different locations as shown in FLINK-6810. This is error-prone, limits contributions, and is also not well supported by the current module system.

Issue Links

• links to: GitHub Pull Request #14378