[FLINK-6361] Finalize the AggregateFunction interface and refactoring built-in aggregates

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Implemented
• Fix Version/s: 1.3.0
• Component/s: Table SQL / API
• Assignee: Shaoxuan Wang
• Reporter: Shaoxuan Wang
• Created: 22/Apr/17 17:33
• Updated: 25/Apr/17 13:46
• Resolved: 25/Apr/17 13:46

Description

We have completed codeGen for all aggregate runtime functions. Now we can finalize the AggregateFunction. This includes 1) remove Accumulator trait; 2) remove accumulate, retract, merge, resetAccumulator, getAccumulatorType methods from interface, and allow them as contracted methods for UDAGG; 3) refactoring the built-in aggregates accordingly.

Issue Links

• links to: GitHub Pull Request #3762