You are viewing a plain text version of this content. The canonical link for it is here.
Posted to dev@drill.apache.org by "Boaz Ben-Zvi (JIRA)" <ji...@apache.org> on 2018/04/17 20:58:00 UTC
[jira] [Created] (DRILL-6339) New option to disable TopN (for
testing Sort)
Boaz Ben-Zvi created DRILL-6339:
-----------------------------------
Summary: New option to disable TopN (for testing Sort)
Key: DRILL-6339
URL: https://issues.apache.org/jira/browse/DRILL-6339
Project: Apache Drill
Issue Type: Improvement
Components: Query Planning & Optimization
Affects Versions: 1.13.0
Reporter: Boaz Ben-Zvi
Assignee: Boaz Ben-Zvi
Fix For: 1.14.0
When a query uses ... ORDER BY ... LIMIT ..., the planner unconditionally picks the TopN operator to (efficiently) implement this order. This precludes an easy way to test the External Sort operator over a large dataset (e.g., test spilling).
A new internal option to disable picking TopN (hence using the External Sort instead) would be useful for various testings. (And may be in other scenarios, like a bug found in the TopN).
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)