[ARROW-5207] [Java] add APIs to support vector reuse

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Won't Do
• Component/s: Java
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/21682
• Assignee: Ji Liu
• Reporter: Ji Liu
• Created: 24/Apr/19 02:36
• Updated: 11/Jan/23 07:38
• Resolved: 09/May/19 08:56

Description

In some scenarios we hope that ValueVector could be reused to reduce creation overhead. This is very common in shuffle stage, it's no need to create ValueVector or realloc buffers every time, suppose that the recordCount of ValueVector and capacity of its buffers is written in stream, when we deserialize it, we can simply judge whether realloc is needed through dataLength.

My proposal is that add APIs in ValueVector to process this logic, otherwise users have to implement by themselves if they want to reuse which is not user-friendly. 

If you agree with this, I would like to take this ticket. Thanks

Issue Links

• links to: GitHub Pull Request #4202