[ARROW-3740] [C++] Calling ArrayBuilder::Resize with length smaller than current appended length results in invalid state

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.11.1
• Fix Version/s: 0.12.0
• Component/s: C++
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/20038
• Assignee: Francois Saint-Jacques
• Reporter: Wes McKinney
• Created: 09/Nov/18 23:16
• Updated: 11/Jan/23 07:29
• Resolved: 29/Nov/18 20:52

Description

This was brought up by the Go patch ARROW-3613. If you append some data to a builder, then call Resize with something smaller than what's reported by length(), the capacity will be updated, but the length will not. So I think further appends would probably segfault. Either way we should add some tests for this case of "shrinking" a builder (which destroys data, but it's permitted by the API

Issue Links

• links to: GitHub Pull Request #3055