Luca Bruno created DRILL-4357:
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Summary: Planner max time limit
Key: DRILL-4357
URL: https://issues.apache.org/jira/browse/DRILL-4357
Project: Apache Drill
Issue Type: Improvement
Components: Query Planning & Optimization
Environment: Debian Linux, Drill embedded 1.4, one machine.
Reporter: Luca Bruno
The plan for this kind of query takes an indefinite amount of time:
SELECT label, AVG(foo) FROM (
SELECT label, AVG(x) as foo FROM table1 GROUP BY label
UNION ALL
SELECT label, AVG(y) as foo FROM table2 GROUP BY label
UNION ALL
... 30 times
) GROUP BY label
That is, the query is not executed at all, because the planning does not finish
(we're talking about hours).
By disabling planner.enable_multiphase_agg, the planning completes immediately
and the query runs.
But I guess this can happen also for other kind of queries. I'd like to suggest
a way to limit the planning time. Once this time elapses, the planner outputs
the best plan found so far.
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