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Posted to issues@drill.apache.org by "ASF GitHub Bot (JIRA)" <ji...@apache.org> on 2018/01/12 18:22:00 UTC
[jira] [Commented] (DRILL-6030) Managed sort should minimize number
of batches in a k-way merge
[ https://issues.apache.org/jira/browse/DRILL-6030?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16324337#comment-16324337 ]
ASF GitHub Bot commented on DRILL-6030:
---------------------------------------
Github user asfgit closed the pull request at:
https://github.com/apache/drill/pull/1075
> Managed sort should minimize number of batches in a k-way merge
> ---------------------------------------------------------------
>
> Key: DRILL-6030
> URL: https://issues.apache.org/jira/browse/DRILL-6030
> Project: Apache Drill
> Issue Type: Improvement
> Reporter: Vlad Rozov
> Assignee: Vlad Rozov
> Labels: ready-to-commit
>
> The time complexity of the algorithm is O(n*k*log(k)) where k is a number of batches to merge and n is a number of records in each batch (assuming equal size batches). As n*k is the total number of record to merge and it can be quite large, minimizing k should give better results.
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