[FLINK-5984] Add resetAccumulator method for AggregateFunction

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.3.0
• Component/s: Table SQL / API
• Assignee: Shaoxuan Wang
• Reporter: Timo Walther
• Created: 07/Mar/17 15:42
• Updated: 09/Mar/17 11:11
• Resolved: 09/Mar/17 11:11

Description

Right now we have to create a new accumulator object if we just want to reset it. We should allow passing the old one as a reuse object to AggregateFunction#createAccumulator. The aggregate function then can decide if it wants to create a new object or reset the old one.

Issue Links

• links to: GitHub Pull Request #3496