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https://issues.apache.org/jira/browse/DRILL-3397?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Deneche A. Hakim updated DRILL-3397:
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Fix Version/s: (was: 1.2.0)
1.3.0
> over(partition by A order by A) should be optimized to over(partition by A)
> ---------------------------------------------------------------------------
>
> Key: DRILL-3397
> URL: https://issues.apache.org/jira/browse/DRILL-3397
> Project: Apache Drill
> Issue Type: Improvement
> Components: Query Planning & Optimization
> Reporter: Deneche A. Hakim
> Assignee: Jinfeng Ni
> Fix For: 1.3.0
>
>
> although the following queries return the same results, they have different
> plans:
> {noformat}
> EXPLAIN PLAN FOR SELECT SUM(salary) OVER(PARTITION BY position_id) FROM
> cp.`employee.json`;
> 00-00 Screen
> 00-01 Project(EXPR$0=[CASE(>($2, 0), $3, null)])
> 00-02 Window(window#0=[window(partition {1} order by [] range between
> UNBOUNDED PRECEDING and UNBOUNDED FOLLOWING aggs [COUNT($0), $SUM0($0)])])
> 00-03 SelectionVectorRemover
> 00-04 Sort(sort0=[$1], dir0=[ASC])
> 00-05 Project(salary=[$1], position_id=[$0])
> 00-06 Scan(groupscan=[EasyGroupScan
> [selectionRoot=/employee.json, numFiles=1, columns=[`salary`, `position_id`],
> files=[classpath:/employee.json]]])
> {noformat}
> {noformat}
> EXPLAIN PLAN FOR SELECT SUM(salary) OVER(PARTITION BY position_id ORDER BY
> position_id) FROM cp.`employee.json`;
> 00-00 Screen
> 00-01 Project(EXPR$0=[CASE(>($2, 0), $3, null)])
> 00-02 Window(window#0=[window(partition {1} order by [1] range between
> UNBOUNDED PRECEDING and CURRENT ROW aggs [COUNT($0), $SUM0($0)])])
> 00-03 SelectionVectorRemover
> 00-04 Sort(sort0=[$1], sort1=[$1], dir0=[ASC], dir1=[ASC])
> 00-05 Project(salary=[$1], position_id=[$0])
> 00-06 Scan(groupscan=[EasyGroupScan
> [selectionRoot=/employee.json, numFiles=1, columns=[`salary`, `position_id`],
> files=[classpath:/employee.json]]])
> {noformat}
> Drill should detect such cases and remove the order-by from the plan.
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