[ARROW-85] C++: memcmp can be avoided in Equal when comparing with the same Buffer

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.1.0
• Component/s: C++
• External issue URL: https://github.com/apache/arrow/issues/15504
• Assignee: Kai Zheng
• Reporter: Kai Zheng
• Created: 28/Mar/16 11:09
• Updated: 11/Jan/23 07:07
• Resolved: 11/Apr/16 08:36

Description

It looks too expensive to use memcmp to compare two buffers. Instead, the starting address and length/capacity would be good enough to use. Higher level codes relying on memcmp behaviour can be done in higher level.

Update: memcmp should be avoided in Equal when comparing with the same Buffer. In other cases, it's still needed to know the content are the same or not.