[ARROW-7831] [Java] unnecessary buffer allocation when calling splitAndTransferTo on variable width vectors

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 1.0.0
• Component/s: Java
• Labels: pull-request-available
• Flags: Patch
• External issue URL: https://github.com/apache/arrow/issues/24060
• Assignee: stephane campinas
• Reporter: stephane campinas
• Created: 11/Feb/20 09:08
• Updated: 11/Jan/23 07:56
• Resolved: 14/Jul/20 16:36

Description

In case the start of the slice is zero, a new offset buffer is unnecessarily allocated:

https://github.com/apache/arrow/blob/master/java/vector/src/main/java/org/apache/arrow/vector/BaseVariableWidthVector.java#L743

Since the starting offset is zero, the offset pointers don't have to be updated.

Issue Links

• links to: GitHub Pull Request #6402
• links to: GitHub Pull Request #7759