[
https://issues.apache.org/jira/browse/ARROW-6306?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Micah Kornfield resolved ARROW-6306.
------------------------------------
Fix Version/s: 0.15.0
Resolution: Fixed
Issue resolved by pull request 5153
[https://github.com/apache/arrow/pull/5153]
> [Java] Support stable sort by stable comparators
> ------------------------------------------------
>
> Key: ARROW-6306
> URL: https://issues.apache.org/jira/browse/ARROW-6306
> Project: Apache Arrow
> Issue Type: New Feature
> Components: Java
> Reporter: Liya Fan
> Assignee: Liya Fan
> Priority: Major
> Labels: pull-request-available
> Fix For: 0.15.0
>
> Time Spent: 2h
> Remaining Estimate: 0h
>
> Stable sort is desirable in many scenarios. It means equal elements preserve
> their relative order after sorting.
> There are stable sort algorithms. However, in practice, the best sort
> algorithm is quick sort and quick sort is not stable.
> To make the best of both worlds, we support stable sort by stable
> comparators. It differs from an ordinary comparator in that it breaks ties by
> comparing the value indices.
> With the stable comparator, the quick sort algorithm becomes a stable
> algorithm.
--
This message was sent by Atlassian Jira
(v8.3.2#803003)
