[ARROW-1094] [C++] Incomplete buffer reads in arrow::io::ReadableFile should exactly truncate returned buffer

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.4.0
• Fix Version/s: 0.4.1
• Component/s: C++
• External issue URL: https://github.com/apache/arrow/issues/16681
• Assignee: Wes McKinney
• Reporter: Wes McKinney
• Created: 06/Jun/17 18:43
• Updated: 11/Jan/23 07:12
• Resolved: 06/Jun/17 20:52

Description

Currently the buffer is only being truncated if it is sufficiently small:

https://github.com/apache/arrow/blob/master/cpp/src/arrow/io/file.cc#L416