Yibo Cai created ARROW-10304:
--------------------------------
Summary: [C++][Compute] Optimize variance kernel for integers
Key: ARROW-10304
URL: https://issues.apache.org/jira/browse/ARROW-10304
Project: Apache Arrow
Issue Type: Improvement
Components: C++
Reporter: Yibo Cai
Assignee: Yibo Cai
Current variance kernel converts all data type to `double` before calculation.
It's sub-optimal for integers. Integer arithmetic is much faster than floating
points, e.g., summation is 4x faster [1].
A quick test for calculating int32 variance shows up to 3x performance gain.
Another benefit is that integer arithmetic is accurate.
[1] https://quick-bench.com/q/_Sz-Peq1MNWYwZYrTtQDx3GI7lQ
--
This message was sent by Atlassian Jira
(v8.3.4#803005)
