yisha zhou created FLINK-35037:
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Summary: Optimize uniqueKeys and upsertKeys inference of windows
with ROW_NUMBER
Key: FLINK-35037
URL: https://issues.apache.org/jira/browse/FLINK-35037
Project: Flink
Issue Type: Improvement
Components: Table SQL / Planner
Affects Versions: 1.20.0
Reporter: yisha zhou
In current Implementation, relNodes with Window type will only deliver
upsert/unique keys of their inputs if these keys contains the partition keys.
However windows with ROW_NUMBER can also produce upsert/unique keys.
For example:
{code:java}
select id, name, score, age, class,
row_number() over(partition by class order by name) as rn,
rank() over (partition by class order by score) as rk,
dense_rank() over (partition by class order by score) as drk,
avg(score) over (partition by class order by score) as avg_score,
max(score) over (partition by age) as max_score,
count(id) over (partition by age) as cnt
from student {code}
(class, rn) is a valid uniqueKeys candidate.
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