Boaz Ben-Zvi created DRILL-6339:
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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).
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