Deneche A. Hakim created DRILL-3397:
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Summary: 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: 1.2.0
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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