[IMPALA-9310] OrcStringColumnReader could move blob instead of copy

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Later
• Component/s: Backend
• Labels: orc
• Epic Color: ghx-label-3
• Assignee: Unassigned
• Reporter: Norbert Luksa
• Created: 21/Jan/20 15:01
• Updated: 23/Dec/20 01:30
• Resolved: 23/Dec/20 01:30

Description

Since IMPALA-9226, in OrcStringColumnReader the blobs of a batch are copied to a freshly allocated space by Impala. As Zoltán pointed out in a review, a possible improvement is moving a blob by finding a way of getting hold of the memory allocated by the ORC library instead of copying.

Issue Links

• depends upon: IMPALA-9226 Improve string allocations of the ORC scanner